Version bump for release 3.0.2 RC 1.

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Change Log
 
+## (unreleased)
+
+Features:
+
+* unified translation format for SAS and PDDL files
+* documentation of `plasp`’s output format
+
+Bug Fixes:
+
+* fixes minor formatting issues in SAS translation
+
 ## 3.0.1 (2016-06-14)
 
 Features:

README.md

@@ -6,8 +6,8 @@
 
 `plasp` 3 is in early development and not intended for productive use yet.
 
-`plasp` 3 translates planning problem instances to ASP facts.
+`plasp` translates planning problem instances to ASP facts.
-`plasp` 3 supports the input languages [PDDL](https://helios.hud.ac.uk/scommv/IPC-14/software.html) (only basic features currently) and the [SAS](http://www.fast-downward.org/TranslatorOutputFormat) (full support of the current version 3), which is used by [Fast Downward](http://www.fast-downward.org/).
+`plasp` 3 supports the input languages [PDDL 3.1](https://helios.hud.ac.uk/scommv/IPC-14/software.html) (only basic features currently) and [SAS](http://www.fast-downward.org/TranslatorOutputFormat) (full support of SAS 3), which is used by [Fast Downward](http://www.fast-downward.org/).
 
 Please get in touch with [Patrick Lühne](https://www.luehne.de) if you have any suggestions.
 
@@ -24,7 +24,7 @@ $ plasp domain.pddl problem.pddl
 Alternatively, PDDL instances may first be translated to SAS, the output format of [Fast Downward](http://www.fast-downward.org/).
 
 ```bash
-$ ./fast-downward.py --translate --build=release64 domain.pddl instance.pddl
+$ ./fast-downward.py --translate --build=release64 domain.pddl problem.pddl
 ```
 
 This creates a file called `output.sas`, which may now be translated by `plasp`.
@@ -42,51 +42,29 @@ $ plasp domain.pddl problem.pddl > instance.lp
 $ clingo encodings/pddl-meta-sequential-incremental.lp instance.lp
 ```
 
-### Command-Line Interface
+## Command-Line Interface
 
 ```bash
 $ plasp [files] [options]
 ```
 
-`[files]` may be omitted, in which case the input is read from `std::cin`.
+`plasp` automatically detects the language of the input program.
-The `[options]` are listed below:
 
-| **option**                        | **explanation**                                                                                                                   |
+See [command-line interface](doc/command-line-interface.md) for more detail.
-|-----------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|
+
-| `-l` [ `--language` ]             | Specify the input language (`sas` or `pddl`). Omit for automatic detection.                                                       |
+## Output Format
-| `--warning-level` arg (=`normal`) | Specify whether to output warnings normally (`normal`), to treat them as critical errors (`error`), or to ignore them (`ignore`). |
+
-| `--color` arg (=`auto`)           | Specify whether to colorize the output (`always`, `never`, or `auto`).                                                            |
+`plasp` provides a uniform output format for SAS and PDDL input problems.
+
+See [output format](doc/output-format.md) for more detail.
+
+If you want to write your own meta encoding for `plasp`’s output, this [simple example encoding](encodings/sequential-incremental.lp) gets you started.
 
 ## Building
 
-`plasp` requires a C++14 compiler (preferrably GCC ≥ 6.1 or clang ≥ 3.8), the `boost` libraries (≥ 1.55), and CMake for building.
+`plasp` requires `boost` and is built via CMake and a C++ compiler.
 
-```bash
+See [building instructions](doc/building-instructions.md) for more detail.
-$ git clone https://github.com/potassco/plasp.git
-$ cd plasp
-$ mkdir -p build/release
-$ cd build/release
-$ cmake ../.. -DCMAKE_BUILD_TYPE=Release
-$ make
-```
-
-The built `plasp` binary is then located at `plasp/build/release/bin/plasp`.
-
-### Running the Tests
-
-`plasp` provides unit tests written using the [Google Test](https://github.com/google/googletest) framework.
-Before building and running the tests, make sure you have fetched the Google Test git submodule:
-
-```bash
-$ git submodule init
-$ git submodule update
-```
-
-Afterward, build and run the tests as follows:
-
-```bash
-$ make run-tests
-```
 
 ## Contributors
 

apps/plasp-app/main.cpp

@@ -66,7 +66,7 @@ int main(int argc, char **argv)
 
 	if (variablesMap.count("version"))
 	{
-		std::cout << "plasp version 3.0.1" << std::endl;
+		std::cout << "plasp version 3.0.2-rc.1" << std::endl;
 		return EXIT_SUCCESS;
 	}
 
@@ -104,9 +104,7 @@ int main(int argc, char **argv)
 
 	try
 	{
-		plasp::utils::Parser parser;
+		plasp::utils::Parser<plasp::utils::CaseInsensitiveParserPolicy> parser;
-
-		parser.setCaseSensitive(false);
 
 		if (variablesMap.count("input"))
 		{
@@ -115,11 +113,11 @@ int main(int argc, char **argv)
 			std::for_each(inputFiles.cbegin(), inputFiles.cend(),
 				[&](const auto &inputFile)
 				{
-					parser.readFile(inputFile);
+					parser.read(inputFile);
 				});
 		}
 		else
-			parser.readStream("std::cin", std::cin);
+			parser.read("std::cin", std::cin);
 
 		const auto detectLanguage =
 			[&]()

doc/building-instructions.md

@@ -0,0 +1,40 @@
+# Building Instructions
+
+`plasp` requires a C++14 compiler (preferrably GCC ≥ 6.1 or clang ≥ 3.8), the `boost` libraries (≥ 1.55), and CMake for building.
+
+```bash
+$ git clone https://github.com/potassco/plasp.git
+$ cd plasp
+$ mkdir -p build/release
+$ cd build/release
+$ cmake ../.. -DCMAKE_BUILD_TYPE=Release
+$ make
+```
+
+The built `plasp` binary is then located at `plasp/build/release/bin/plasp`.
+
+To update `plasp` to the most recent version, perform the following steps:
+
+```bash
+$ cd plasp
+$ git pull
+$ cd build/release
+$ cmake .
+$ make
+```
+
+## Running the Tests
+
+`plasp` provides unit tests written using the [Google Test](https://github.com/google/googletest) framework.
+Before building and running the tests, make sure you have fetched the Google Test git submodule:
+
+```bash
+$ git submodule init
+$ git submodule update
+```
+
+Afterward, build and run the tests as follows:
+
+```bash
+$ make run-tests
+```

doc/command-line-interface.md

@@ -0,0 +1,18 @@
+# Command-Line Interface
+
+```bash
+$ plasp [files] [options]
+```
+
+`plasp` automatically detects the language of the input files.
+
+Multiple files may be provided in an arbitrary order.
+`[files]` may also be omitted, in which case the input is read from `std::cin`.
+
+`plasp` supports the following options:
+
+| **option**                        | **explanation**                                                                                                                   |
+|-----------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|
+| `-l` [ `--language` ]             | Specify the input language (`sas` or `pddl`). Omit for automatic detection.                                                       |
+| `--warning-level` arg (=`normal`) | Specify whether to output warnings normally (`normal`), to treat them as critical errors (`error`), or to ignore them (`ignore`). |
+| `--color` arg (=`auto`)           | Specify whether to colorize the output (`always`, `never`, or `auto`).                                                            |

doc/feature-requirements.md

@@ -0,0 +1,22 @@
+# Feature Requirements
+
+Feature requirements are part of `plasp`’s [output format](output-format.md).
+Currently, `plasp` detects feature requirements only for SAS problems.
+
+`plasp` supports the following feature requirements:
+
+SAS feature | description
+------------|------------
+`actionCosts` | actions have associated costs (see [action costs](output-format.md#action-costs))
+`axiomRules` | immediate actions are used, which are executed as soon as the preconditions are satisfied (see [axiom rules](output-format.md#axiom-rules))
+`conditionalEffects` | some effects of an action may have additional conditions (see [actions](output-format.md#actions))
+
+## Example
+
+The following specifies that the input problem has the two requirements `actionCosts` and `conditionalEffects`.
+
+```prolog
+% requirements
+requiresFeature(actionCosts).
+requiresFeature(conditionalEffects).
+```

doc/output-format.md

@@ -0,0 +1,202 @@
+# Output Format
+
+`plasp` 3 translates SAS and PDDL files into a uniform ASP fact format.
+
+## Overview
+
+Essentially, `plasp`’s output format consists of [state variables](#variables) that are modified by [actions](#actions) if their preconditions are fulfilled.
+Variables reference [entities](#constants-objects) that are affected by the actions.
+As with PDDL, the objective is to achieve a specific [goal](#goal) starting from an [initial state](#initial-state) by executing a sequence of actions.
+
+`plasp`’s variables correspond to the multivalued variables in SAS.
+PDDL predicates are turned into Boolean variables to make the output format consistent.
+
+Actions are modeled exactly as PDDL actions and SAS operators.
+
+## In a Nutshell
+
+The following illustrates `plasp`’s output format for the problem of turning switches on and off.
+
+```prolog
+% declares the type "type(switch)"
+type(type(switch)).
+
+% introduces a switch "constant(a)"
+constant(constant(a)).
+has(constant(a), type(switch)).
+
+% declares a variable "variable(on(X))" for switches X
+variable(variable(on(X))) :- has(X, type(switch)).
+
+% the variable may be true or false
+contains(variable(on(X)), value(on(X)), true)) :- has(X, type(switch)).
+contains(variable(on(X)), value(on(X)), false)) :- has(X, type(switch)).
+
+% declares the action "action(turnOn(X))", which requires switch X to be off and then turns it on
+action(action(turnOn(X))) :- has(X, type(switch)).
+precondition(action(turnOn(X)), variable(on(X)), value(on(X), false)) :- has(X, type(switch)).
+postcondition(action(turnOn(X)), effect(0), variable(on(X)), value(on(X), true)) :- has(X, type(switch)).
+
+% initially, the switch is off
+initialState(variable(on(constant(a))), value(on(constant(a)), false)).
+
+% in the end, the switch should be on
+goal(variable(on(constant(a))), value(on(constant(a)), true)).
+```
+
+## Syntax and Semantics
+
+`plasp` structures the translated ASP facts into multiple sections, which are explained in the following.
+
+### Feature Requirements
+
+```prolog
+% declares a required feature
+requires(feature(<name>)).
+```
+
+`plasp` recognizes and declares advanced features used by the input problem, such as conditional effects, [mutex groups](#mutex-groups) and [axiom rules](#axiom-rules) (currently only SAS).
+See the [full list of supported features](feature-requirements.md) for more information.
+
+The feature requirement predicates may be used in meta encodings to warn about unsupported features.
+
+### Types
+
+```prolog
+% declares a <type>
+type(type(<name>)).
+
+% specifies <constant> to be of type type(<name>)
+has(<constant>, type(<name>)).
+```
+
+[Variables](#variables), [constants](#constants-objects), and [objects](#constants-objects) may be typed. Types are only available with PDDL and if typing is enabled.
+
+### Variables
+
+```prolog
+% declares a <variable>
+variable(variable(<name>)).
+
+% adds a <value> to the domain of a <variable>
+contains(<variable>, <value>).
+```
+
+`plasp`’s variables represent the current state of the planning problem.
+Variables are linked to the problem's [objects](#constants-objects) and [constants](#constants-objects).
+
+`plasp`’s variables are multivalued, and each variable has exactly one value at each point in time.
+
+With SAS, variable names are numbers starting at 0, `variable(<number>)`.
+SAS variables are inherently multivalued, which results in two or more values of the form `value(<SAS predicate>, <bool>)` for each variable.
+
+With PDDL, Boolean variables are created from the PDDL predicates.
+Variables ared named after the PDDL predicates, `variable(<PDDL predicate>).`
+Each variable contains exactly two values (one `true`, one `false`) of the form `value(<PDDL predicate>, <bool>)`.
+Note that with PDDL, variables and values are named identically.
+
+### Actions
+
+```prolog
+% declares an <action>
+action(action(<name>)).
+
+% defines that as a precondition to <action>, <variable> must have value <value>
+precondition(<action>, <variable>, <value>).
+
+% defines that after applying <action>, <variable> is assigned <value>
+postcondition(<action>, effect(<number>), <variable>, <value>).
+
+% defines the condition of a conditional effect
+precondition(effect(<number>), <variable>, <value>).
+
+% specifies the costs of applying <action>
+costs(<action>, <number>).
+```
+
+Actions may require certain variables to have specific values in order to be executed.
+After applying an action, variables get new values according to the action's postconditions.
+
+Actions may have *conditional effects*, that is, certain postconditions are only applied if additional conditions are satisfied.
+For this reason, each conditional effect is uniquely identified with a predicate `effect(<number>)` as the second argument of the `postcondition` facts.
+The conditions of conditional effects are given by additional `precondition` facts that take the respective `effect(<number>)` predicates as the first argument.
+
+Unconditional effects are identified with `effect(unconditional)`.
+
+Conditional effects are currently only supported with SAS input problems.
+
+Actions may also have *action costs* required to apply them. Action costs are currently supported for SAS only.
+
+### Constants/Objects
+
+```prolog
+% declares a <constant> or object
+constant(constant(<name>)).
+
+% specifies <constant> to be of type type(<name>)
+has(<constant>, <type>).
+```
+
+Constants and objects are the entities that are affected by [actions](#actions), for instance, the blocks in a Blocks World problem.
+Constants are global for a domain, while objects are problem-specific.
+
+`plasp` does not distinguish between the two (modeling both as constants), as both are identically used static identifiers.
+
+### Initial State
+
+```prolog
+% initializes <variable> with a specific <value>
+initialState(<variable>, <value>).
+```
+
+The initial state contains all [variable](#variables) assignments that hold before executing any [actions](#actions).
+
+Note that with PDDL, the initial state might not assign values to all variables. Instead, unassigned values have to be assigned `false` manually.
+
+### Goal
+
+```prolog
+% specifies that <variable> shall obtain <value> in the end
+goal(<variable>, <value>).
+```
+
+The goal specifies all variable assignments that have to be fulfilled after executing the plan.
+
+### Mutex Groups
+
+```prolog
+% declares a <mutex group>
+mutexGroup(mutexGroup(<number>)).
+
+% adds the assignment of <variable> to <value> to a <mutex group>
+contains(<mutex group>, <variable>, <value>).
+```
+
+SAS contains information about mutually exclusive [variable](#variables) assignments.
+That is, *at most one* variable assignment of each mutex group must be satisfied at all times.
+
+Mutex group facts are only present with SAS input programs and not PDDL.
+
+Mutex groups contain essential information in order to find plans correctly.
+That is, if mutex groups are present in `plasp`’s output, they have to be accounted for appropriately.
+
+### Axiom Rules
+
+```prolog
+% declares an <axiom rule>
+axiomRule(axiomRule(<number>)).
+
+% defines that as a precondition to <axiom rule>, <variable> must have value <value>
+precondition(<axiom rule>, <variable>, <value>).
+
+% defines that after applying <axiom rule>, <variable> is assigned <value>
+postcondition(<axiom rule>, <variable>, <value>).
+```
+
+Axiom rules are similar to [actions](#actions) in that they modify [variables](#variables) if certain preconditions are satisfied.
+However, axiom rules must be applied *immediately* as soon as their preconditions are satisfied.
+
+Axiom rule facts are only present with SAS input programs and not PDDL.
+
+Axiom rules contain essential information in order to find plans correctly.
+That is, if axiom rules are present in `plasp`’s output, they have to be accounted for appropriately.

encodings/pddl-meta-sequential-incremental.lp

@@ -1,31 +0,0 @@
-#include <incmode>.
-
-#program base.
-
-% Establish initial state
-holds(Predicate, 0) :- initialState(Predicate).
-
-#program step(t).
-
-% Perform actions
-1 {occurs(action(Action), t) : action(Action)} 1.
-
-% Check preconditions
-:- occurs(Action, t), precondition(Action, Predicate, true), not holds(Predicate, t - 1).
-:- occurs(Action, t), precondition(Action, Predicate, false), holds(Predicate, t - 1).
-
-% Apply effects
-caused(Predicate, true, t) :- occurs(Action, t), postcondition(Action, Predicate, true).
-caused(Predicate, false, t) :- occurs(Action, t), postcondition(Action, Predicate, false).
-
-holds(Predicate, t) :- caused(Predicate, true, t).
-holds(Predicate, t) :- holds(Predicate, t - 1), not caused(Predicate, false, t).
-
-#program check(t).
-
-% Verify that goal is met
-:- query(t), goal(Predicate, true), not holds(Predicate, t).
-:- query(t), goal(Predicate, false), holds(Predicate, t).
-
-#show query/1.
-#show occurs/2.

encodings/sas-meta-sequential-incremental.lp

@@ -1,40 +0,0 @@
-#include <incmode>.
-
-% Check feature requirements
-:- requiresFeature(actionCosts).
-:- requiresFeature(axiomRules).
-:- requiresFeature(conditionalEffects).
-
-#program base.
-
-% Establish initial state
-holds(Var, Val, 0) :- initialState(Var, Val).
-
-#program step(t).
-
-% Perform actions
-1 {occurs(action(A), t) : action(A)} 1.
-
-% Check preconditions
-:- occurs(A, t), precondition(A, Var, Val), not holds(Var, Val, t - 1).
-
-% Apply effects
-caused(Var, Val, t) :- occurs(A, t), postcondition(A, _, Var, Val).
-modified(Var, t) :- caused(Var, Val, t).
-
-holds(Var, Val, t) :- caused(Var, Val, t).
-holds(Var, Val, t) :- holds(Var, Val, t - 1), not modified(Var, t).
-
-% Check that variables have unique values
-:- variable(X), Var = variable(X), not 1 {holds(Var, Val, t) : contains(Var, Val)} 1.
-
-% Check mutexes
-:- mutexGroup(X), M = mutexGroup(X), not {holds(Var, Val, t) : contains(M, Var, Val)} 1.
-
-#program check(t).
-
-% Verify that goal is met
-:- query(t), goal(Var, Val), not holds(Var, Val, t).
-
-#show query/1.
-#show occurs/2.

encodings/sequential-incremental.lp

@@ -0,0 +1,43 @@
+#include <incmode>.
+
+% Check feature requirements
+:- requiresFeature(actionCosts).
+:- requiresFeature(axiomRules).
+:- requiresFeature(conditionalEffects).
+
+#program base.
+
+% Establish initial state
+holds(Variable, Value, 0) :- initialState(Variable, Value).
+
+% Make unspecified initial state variables false by default (for PDDL)
+holds(variable(Variable), value(Variable, false), 0) :- variable(variable(Variable)), {initialState(variable(Variable), _)} 0.
+
+#program step(t).
+
+% Perform actions
+1 {occurs(Action, t) : action(Action)} 1.
+
+% Check preconditions
+:- occurs(Action, t), precondition(Action, Variable, Value), not holds(Variable, Value, t - 1).
+
+% Apply effects
+caused(Variable, Value, t) :- occurs(Action, t), postcondition(Action, _, Variable, Value).
+modified(Variable, t) :- caused(Variable, Value, t).
+
+holds(Variable, Value, t) :- caused(Variable, Value, t).
+holds(Variable, Value, t) :- holds(Variable, Value, t - 1), not modified(Variable, t).
+
+% Check that variables have unique values
+:- variable(Variable), not 1 {holds(Variable, Value, t) : contains(Variable, Value)} 1.
+
+% Check mutexes
+:- mutexGroup(MutexGroup), not {holds(Variable, Value, t) : contains(MutexGroup, Variable, Value)} 1.
+
+#program check(t).
+
+% Verify that goal is met
+:- query(t), goal(Variable, Value), not holds(Variable, Value, t).
+
+#show query/1.
+#show occurs/2.

include/plasp/LanguageDetection.h

@@ -13,15 +13,14 @@ namespace plasp
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Language::Type detectLanguage(utils::Parser &parser)
+Language::Type detectLanguage(utils::Parser<utils::CaseInsensitiveParserPolicy> &parser)
 {
-	parser.setCaseSensitive(false);
 	parser.skipWhiteSpace();
 
 	// SAS begins with "begin_version"
-	if (parser.probe<std::string>("begin"))
+	if (parser.testAndSkip<std::string>("begin"))
 	{
-		parser.seek(std::ios::beg);
+		parser.seek(0);
 		return Language::Type::SAS;
 	}
 
@@ -33,7 +32,7 @@ Language::Type detectLanguage(utils::Parser &parser)
 	}
 
 	// PDDL contains sections starting with "(define"
-	if (parser.probe<std::string>("(") && parser.probe<std::string>("define"))
+	if (parser.testAndSkip<std::string>("(") && parser.testAndSkip<std::string>("define"))
 	{
 		parser.seek(std::ios::beg);
 		return Language::Type::PDDL;

include/plasp/pddl/Context.h

@@ -5,6 +5,7 @@
 #include <unordered_map>
 #include <vector>
 
+#include <plasp/pddl/Parser.h>
 #include <plasp/utils/Logger.h>
 
 namespace plasp
@@ -22,20 +23,21 @@ class Context
 {
 	public:
 		Context() = default;
+		~Context() = default;
 
-		explicit Context(utils::Parser &&parser)
+		explicit Context(Parser &&otherParser)
-		:	parser{std::move(parser)}
+		:	parser{std::move(otherParser)}
 		{
 		}
 
-		explicit Context(utils::Logger &&logger)
+		explicit Context(utils::Logger &&otherLogger)
-		:	logger{std::move(logger)}
+		:	logger{std::move(otherLogger)}
 		{
 		}
 
-		explicit Context(utils::Parser &&parser, utils::Logger &&logger)
+		explicit Context(Parser &&otherParser, utils::Logger &&otherLogger)
-		:	parser{std::move(parser)},
+		:	parser{std::move(otherParser)},
-			logger{std::move(logger)}
+			logger{std::move(otherLogger)}
 		{
 		}
 
@@ -56,7 +58,7 @@ class Context
 			return *this;
 		}
 
-		utils::Parser parser;
+		Parser parser;
 		utils::Logger logger;
 };
 

include/plasp/pddl/Description.h

@@ -45,9 +45,9 @@ class Description
 
 		Context m_context;
 
-		utils::Parser::Position m_domainPosition;
+		utils::Stream::Position m_domainPosition;
 		std::unique_ptr<Domain> m_domain;
-		utils::Parser::Position m_problemPosition;
+		utils::Stream::Position m_problemPosition;
 		std::unique_ptr<Problem> m_problem;
 };
 

include/plasp/pddl/Domain.h

@@ -4,10 +4,11 @@
 #include <plasp/pddl/Action.h>
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Expression.h>
+#include <plasp/pddl/Parser.h>
+#include <plasp/pddl/Requirement.h>
 #include <plasp/pddl/expressions/Constant.h>
 #include <plasp/pddl/expressions/PredicateDeclaration.h>
 #include <plasp/pddl/expressions/PrimitiveType.h>
-#include <plasp/pddl/Requirement.h>
 
 namespace plasp
 {
@@ -68,19 +69,19 @@ class Domain
 
 		std::string m_name;
 
-		utils::Parser::Position m_requirementsPosition;
+		utils::Stream::Position m_requirementsPosition;
 		Requirements m_requirements;
 
-		utils::Parser::Position m_typesPosition;
+		utils::Stream::Position m_typesPosition;
 		expressions::PrimitiveTypes m_types;
 
-		utils::Parser::Position m_constantsPosition;
+		utils::Stream::Position m_constantsPosition;
 		expressions::Constants m_constants;
 
-		utils::Parser::Position m_predicatesPosition;
+		utils::Stream::Position m_predicatesPosition;
 		expressions::PredicateDeclarations m_predicates;
 
-		std::vector<utils::Parser::Position> m_actionPositions;
+		std::vector<utils::Stream::Position> m_actionPositions;
 		std::vector<std::unique_ptr<Action>> m_actions;
 };
 

include/plasp/pddl/IO.h

@@ -3,7 +3,7 @@
 
 #include <iostream>
 
-#include <plasp/utils/Parser.h>
+#include <plasp/pddl/Parser.h>
 
 namespace plasp
 {
@@ -16,7 +16,7 @@ namespace pddl
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-inline void skipSection(utils::Parser &parser)
+inline void skipSection(Parser &parser)
 {
 	size_t openParentheses = 1;
 

include/plasp/pddl/Parser.h

@@ -0,0 +1,49 @@
+#ifndef __PLASP__PDDL__PARSER_H
+#define __PLASP__PDDL__PARSER_H
+
+#include <plasp/utils/Parser.h>
+
+namespace plasp
+{
+namespace pddl
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Parser
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+class PDDLParserPolicy
+{
+	public:
+		static char transformCharacter(char c) noexcept
+		{
+			return std::tolower(c);
+		}
+
+		static bool isWhiteSpaceCharacter(char c)
+		{
+			return std::iswspace(c);
+		}
+
+		static bool isIdentifierCharacter(char c)
+		{
+			return c != '?'
+				&& c != '('
+				&& c != ')'
+				&& c != ';'
+				&& std::isgraph(c);
+		}
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+using Parser = utils::Parser<PDDLParserPolicy>;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}
+
+#endif

include/plasp/pddl/Problem.h

@@ -4,6 +4,7 @@
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Expression.h>
 #include <plasp/pddl/InitialState.h>
+#include <plasp/pddl/Parser.h>
 #include <plasp/pddl/Requirement.h>
 
 namespace plasp
@@ -61,18 +62,18 @@ class Problem
 
 		std::string m_name;
 
-		utils::Parser::Position m_domainPosition;
+		utils::Stream::Position m_domainPosition;
 
-		utils::Parser::Position m_requirementsPosition;
+		utils::Stream::Position m_requirementsPosition;
 		Requirements m_requirements;
 
-		utils::Parser::Position m_objectsPosition;
+		utils::Stream::Position m_objectsPosition;
 		expressions::Constants m_objects;
 
-		utils::Parser::Position m_initialStatePosition;
+		utils::Stream::Position m_initialStatePosition;
 		std::unique_ptr<InitialState> m_initialState;
 
-		utils::Parser::Position m_goalPosition;
+		utils::Stream::Position m_goalPosition;
 		ExpressionPointer m_goal;
 };
 

include/plasp/pddl/expressions/At.h

@@ -3,7 +3,6 @@
 
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Expression.h>
-#include <plasp/pddl/Identifier.h>
 
 namespace plasp
 {
@@ -57,8 +56,8 @@ AtPointer At::parse(Context &context, ExpressionContext &expressionContext,
 
 	const auto position = parser.position();
 
-	if (!parser.probe<std::string>("(")
+	if (!parser.testAndSkip<std::string>("(")
-		|| !parser.probeIdentifier("at", isIdentifier))
+		|| !parser.testIdentifierAndSkip("at"))
 	{
 		parser.seek(position);
 		return nullptr;
@@ -68,9 +67,9 @@ AtPointer At::parse(Context &context, ExpressionContext &expressionContext,
 
 	const auto timePointPosition = parser.position();
 
-	if (parser.probeIdentifier("start", isIdentifier))
+	if (parser.testIdentifierAndSkip("start"))
 		timePoint = TimePointStart;
-	else if (parser.probeIdentifier("end", isIdentifier))
+	else if (parser.testIdentifierAndSkip("end"))
 		timePoint = TimePointEnd;
 	else if (parser.probeNumber())
 	{

include/plasp/pddl/expressions/Binary.h

@@ -4,7 +4,6 @@
 #include <plasp/pddl/ConsistencyException.h>
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Expression.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/expressions/Variable.h>
 
 namespace plasp
@@ -52,8 +51,8 @@ std::unique_ptr<Derived> Binary<Derived>::parse(Context &context,
 
 	const auto position = parser.position();
 
-	if (!parser.probe<std::string>("(")
+	if (!parser.testAndSkip<std::string>("(")
-		|| !parser.probeIdentifier(Derived::Identifier, isIdentifier))
+		|| !parser.testIdentifierAndSkip(Derived::Identifier))
 	{
 		parser.seek(position);
 		return nullptr;

include/plasp/pddl/expressions/Constant.h

@@ -2,7 +2,6 @@
 #define __PLASP__PDDL__EXPRESSIONS__CONSTANT_H
 
 #include <plasp/pddl/Expression.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/utils/Parser.h>
 #include <plasp/utils/ParserException.h>
 

include/plasp/pddl/expressions/NAry.h

@@ -4,7 +4,6 @@
 #include <plasp/pddl/ConsistencyException.h>
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Expression.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/expressions/Variable.h>
 
 namespace plasp
@@ -50,8 +49,8 @@ std::unique_ptr<Derived> NAry<Derived>::parse(Context &context,
 
 	const auto position = parser.position();
 
-	if (!parser.probe<std::string>("(")
+	if (!parser.testAndSkip<std::string>("(")
-		|| !parser.probeIdentifier(Derived::Identifier, isIdentifier))
+		|| !parser.testIdentifierAndSkip(Derived::Identifier))
 	{
 		parser.seek(position);
 		return nullptr;
@@ -71,7 +70,7 @@ std::unique_ptr<Derived> NAry<Derived>::parse(Context &context,
 	}
 
 	if (expression->m_arguments.empty())
-		context.logger.logWarning(context.parser, "“" + Derived::Identifier + "” expressions should not be empty");
+		context.logger.logWarning(parser.coordinate(), "“" + Derived::Identifier + "” expressions should not be empty");
 
 	parser.expect<std::string>(")");
 

include/plasp/pddl/expressions/Not.h

@@ -3,7 +3,6 @@
 
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Expression.h>
-#include <plasp/pddl/Identifier.h>
 
 namespace plasp
 {
@@ -50,8 +49,8 @@ NotPointer Not::parse(Context &context, ExpressionContext &expressionContext,
 
 	const auto position = parser.position();
 
-	if (!parser.probe<std::string>("(")
+	if (!parser.testAndSkip<std::string>("(")
-		|| !parser.probeIdentifier("not", isIdentifier))
+		|| !parser.testIdentifierAndSkip("not"))
 	{
 		parser.seek(position);
 		return nullptr;

include/plasp/pddl/expressions/PrimitiveType.h

@@ -3,7 +3,6 @@
 
 #include <plasp/pddl/ConsistencyException.h>
 #include <plasp/pddl/Expression.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/utils/ParserException.h>
 
 namespace plasp

include/plasp/sas/AssignedVariable.h

@@ -27,8 +27,8 @@ using AssignedVariables = std::vector<AssignedVariable>;
 class AssignedVariable
 {
 	public:
-		static AssignedVariable fromSAS(utils::Parser &parser, const Variables &variables);
+		static AssignedVariable fromSAS(utils::Parser<> &parser, const Variables &variables);
-		static AssignedVariable fromSAS(utils::Parser &parser, const Variable &variable);
+		static AssignedVariable fromSAS(utils::Parser<> &parser, const Variable &variable);
 
 	public:
 		explicit AssignedVariable(const Variable &variable, const Value &value);

include/plasp/sas/AxiomRule.h

@@ -29,7 +29,7 @@ class AxiomRule
 		using Condition = AssignedVariable;
 		using Conditions = AssignedVariables;
 
-		static AxiomRule fromSAS(utils::Parser &parser, const Variables &variables);
+		static AxiomRule fromSAS(utils::Parser<> &parser, const Variables &variables);
 
 	public:
 		const Conditions &conditions() const;

include/plasp/sas/Description.h

@@ -29,7 +29,7 @@ namespace sas
 class Description
 {
 	public:
-		static Description fromParser(utils::Parser &&parser);
+		static Description fromParser(utils::Parser<> &&parser);
 		static Description fromStream(std::istream &istream);
 		static Description fromFile(const boost::filesystem::path &path);
 
@@ -45,19 +45,21 @@ class Description
 		bool usesAxiomRules() const;
 		bool usesConditionalEffects() const;
 
+		bool hasRequirements() const;
+
 	private:
 		Description();
 
-		void parseContent(utils::Parser &parser);
+		void parseContent(utils::Parser<> &parser);
 
-		void parseVersionSection(utils::Parser &parser) const;
+		void parseVersionSection(utils::Parser<> &parser) const;
-		void parseMetricSection(utils::Parser &parser);
+		void parseMetricSection(utils::Parser<> &parser);
-		void parseVariablesSection(utils::Parser &parser);
+		void parseVariablesSection(utils::Parser<> &parser);
-		void parseMutexSection(utils::Parser &parser);
+		void parseMutexSection(utils::Parser<> &parser);
-		void parseInitialStateSection(utils::Parser &parser);
+		void parseInitialStateSection(utils::Parser<> &parser);
-		void parseGoalSection(utils::Parser &parser);
+		void parseGoalSection(utils::Parser<> &parser);
-		void parseOperatorSection(utils::Parser &parser);
+		void parseOperatorSection(utils::Parser<> &parser);
-		void parseAxiomSection(utils::Parser &parser);
+		void parseAxiomSection(utils::Parser<> &parser);
 
 		bool m_usesActionCosts;
 

include/plasp/sas/Effect.h

@@ -29,7 +29,7 @@ class Effect
 		using Condition = AssignedVariable;
 		using Conditions = AssignedVariables;
 
-		static Effect fromSAS(utils::Parser &parser, const Variables &variables, Conditions &preconditions);
+		static Effect fromSAS(utils::Parser<> &parser, const Variables &variables, Conditions &preconditions);
 
 	public:
 		const Conditions &conditions() const;

include/plasp/sas/Goal.h

@@ -21,7 +21,7 @@ class Goal
 		using Fact = AssignedVariable;
 		using Facts = AssignedVariables;
 
-		static Goal fromSAS(utils::Parser &parser, const Variables &variables);
+		static Goal fromSAS(utils::Parser<> &parser, const Variables &variables);
 
 	public:
 		const Facts &facts() const;

include/plasp/sas/InitialState.h

@@ -21,7 +21,7 @@ class InitialState
 		using Fact = AssignedVariable;
 		using Facts = AssignedVariables;
 
-		static InitialState fromSAS(utils::Parser &parser, const Variables &variables);
+		static InitialState fromSAS(utils::Parser<> &parser, const Variables &variables);
 
 	public:
 		const Facts &facts() const;

include/plasp/sas/MutexGroup.h

@@ -28,7 +28,7 @@ class MutexGroup
 		using Fact = AssignedVariable;
 		using Facts = AssignedVariables;
 
-		static MutexGroup fromSAS(utils::Parser &parser, const Variables &variables);
+		static MutexGroup fromSAS(utils::Parser<> &parser, const Variables &variables);
 
 	public:
 		const Facts &facts() const;

include/plasp/sas/Operator.h

@@ -33,7 +33,7 @@ class Operator
 		using Condition = AssignedVariable;
 		using Conditions = AssignedVariables;
 
-		static Operator fromSAS(utils::Parser &parser, const Variables &variables);
+		static Operator fromSAS(utils::Parser<> &parser, const Variables &variables);
 
 	public:
 		void printPredicateAsASP(utils::LogStream &ostream) const;

include/plasp/sas/Predicate.h

@@ -22,7 +22,7 @@ namespace sas
 class Predicate
 {
 	public:
-		static Predicate fromSAS(utils::Parser &parser);
+		static Predicate fromSAS(utils::Parser<> &parser);
 
 		using Arguments = std::vector<std::string>;
 

include/plasp/sas/Value.h

@@ -39,8 +39,8 @@ struct Value
 		static const Value Any;
 		static const Value None;
 
-		static Value fromSAS(utils::Parser &parser);
+		static Value fromSAS(utils::Parser<> &parser);
-		static const Value &referenceFromSAS(utils::Parser &parser, const Variable &variable);
+		static const Value &referenceFromSAS(utils::Parser<> &parser, const Variable &variable);
 
 	public:
 		Value negated() const;

include/plasp/sas/Variable.h

@@ -28,8 +28,8 @@ using Variables = std::vector<Variable>;
 class Variable
 {
 	public:
-		static Variable fromSAS(utils::Parser &parser);
+		static Variable fromSAS(utils::Parser<> &parser);
-		static const Variable &referenceFromSAS(utils::Parser &parser, const Variables &variables);
+		static const Variable &referenceFromSAS(utils::Parser<> &parser, const Variables &variables);
 
 	public:
 		void printNameAsASPPredicate(utils::LogStream &outputStream) const;

include/plasp/sas/VariableTransition.h

@@ -26,7 +26,7 @@ using VariableTransitions = std::vector<VariableTransition>;
 class VariableTransition
 {
 	public:
-		static VariableTransition fromSAS(utils::Parser &parser, const Variables &variables);
+		static VariableTransition fromSAS(utils::Parser<> &parser, const Variables &variables);
 
 	public:
 		const Variable &variable() const;

include/plasp/utils/Logger.h

@@ -4,8 +4,8 @@
 #include <string>
 
 #include <plasp/utils/LogStream.h>
-#include <plasp/utils/Parser.h>
 #include <plasp/utils/ParserException.h>
+#include <plasp/utils/StreamCoordinate.h>
 
 namespace plasp
 {
@@ -44,8 +44,8 @@ class Logger
 		void setColorPolicy(LogStream::ColorPolicy colorPolicy);
 
 		void logError(const std::string &message);
-		void logError(const Parser::Coordinate &coordinate, const std::string &message);
+		void logError(const StreamCoordinate &coordinate, const std::string &message);
-		void logWarning(const Parser &parser, const std::string &message);
+		void logWarning(const StreamCoordinate &parserCoordinate, const std::string &message);
 
 	private:
 		LogStream m_outputStream;

include/plasp/utils/Parser.h

@@ -8,111 +8,194 @@
 
 #include <boost/filesystem.hpp>
 
+#include <plasp/utils/ParserException.h>
+#include <plasp/utils/ParserPolicy.h>
+#include <plasp/utils/Stream.h>
+#include <plasp/utils/StreamCoordinate.h>
+
 namespace plasp
 {
 namespace utils
 {
 
+template<typename Type>
+struct Tag
+{
+};
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 //
 // Parser
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-class Parser
+template<class ParserPolicy = CaseSensitiveParserPolicy>
+class Parser: public Stream, public ParserPolicy
 {
-	public:
+	template<class OtherParserPolicy>
-		using Position = std::stringstream::pos_type;
+	friend class Parser;
-
-		struct Coordinate
-		{
-			std::string sectionName;
-			size_t row;
-			size_t column;
-		};
-
-		struct StreamDelimiter
-		{
-			Position position;
-			std::string sectionName;
-		};
 
 	public:
 		explicit Parser();
 		explicit Parser(std::string streamName, std::istream &istream);
 
-		// Forbid copy construction/assignment
+		template<class OtherParser>
-		Parser(const Parser &other) = delete;
+		Parser(OtherParser &&otherParser)
-		Parser &operator=(const Parser &other) = delete;
+		{
-
+			m_stream = std::move(otherParser.m_stream);
-		Parser(Parser &&other);
+			m_delimiters = std::move(otherParser.m_delimiters);
-		Parser &operator=(Parser &&other);
+		}
-
-		void readStream(std::string streamName, std::istream &istream);
-		void readFile(const boost::filesystem::path &path);
-
-		void reset();
-		void seek(Position position);
-		Position position() const;
-		Coordinate coordinate() const;
-
-		void setCaseSensitive(bool isCaseInsensitive = true);
-
-		char currentCharacter() const;
-		void advance();
-		bool atEndOfStream() const;
 
 		void removeComments(const std::string &startSequence, const std::string &endSequence, bool removeEnd);
 
+		char currentCharacter() const;
+
 		template<typename Type>
 		Type parse();
 
-		template<class CharacterPredicate, class WhiteSpacePredicate>
+		template<typename Type>
-		std::string parseIdentifier(CharacterPredicate characterPredicate, WhiteSpacePredicate whiteSpacePredicate);
+		bool testAndReturn(const Type &expectedValue);
-
-		template<class CharacterPredicate>
-		std::string parseIdentifier(CharacterPredicate characterPredicate);
 
 		template<typename Type>
-		bool probe(const Type &expectedValue);
+		bool testAndSkip(const Type &expectedValue);
-
-		template<class CharacterPredicate>
-		bool probeIdentifier(const std::string &identifier, CharacterPredicate characterPredicate);
-
-		bool probeNumber();
 
 		template<typename Type>
 		void expect(const Type &expectedValue);
 
-		template<class WhiteSpacePredicate>
+		std::string parseIdentifier();
-		void skipWhiteSpace(WhiteSpacePredicate whiteSpacePredicate);
+		bool testIdentifierAndReturn(const std::string &identifier);
+		bool testIdentifierAndSkip(const std::string &identifier);
+
+		// TODO: remove
+		bool probeNumber();
+
+		std::string parseLine();
 
 		void skipWhiteSpace();
 		void skipLine();
 
-		std::string getLine();
-
 	private:
-		static const std::istreambuf_iterator<char> EndOfFile;
+		std::string parseImpl(Tag<std::string>);
+		char parseImpl(Tag<char>);
+		uint64_t parseImpl(Tag<uint64_t>);
+		int64_t parseImpl(Tag<int64_t>);
+		uint32_t parseImpl(Tag<uint32_t>);
+		int32_t parseImpl(Tag<int32_t>);
+		bool parseImpl(Tag<bool>);
 
-	private:
+		bool testImpl(const std::string &expectedValue);
-		void checkStream() const;
+		bool testImpl(char expectedValue);
+		bool testImpl(uint64_t expectedValue);
+		bool testImpl(int64_t expectedValue);
+		bool testImpl(uint32_t expectedValue);
+		bool testImpl(int32_t expectedValue);
+		bool testImpl(bool expectedValue);
 
 		uint64_t parseIntegerBody();
-
-		mutable std::stringstream m_stream;
-
-		std::vector<StreamDelimiter> m_streamDelimiters;
-
-		bool m_isCaseSensitive;
 };
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-template<class CharacterPredicate, class WhiteSpacePredicate>
+template<class ParserPolicy>
-std::string Parser::parseIdentifier(CharacterPredicate characterPredicate, WhiteSpacePredicate whiteSpacePredicate)
+Parser<ParserPolicy>::Parser()
+:	Stream()
 {
-	skipWhiteSpace(whiteSpacePredicate);
+}
+
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+Parser<ParserPolicy>::Parser(std::string streamName, std::istream &istream)
+:	Stream(streamName, istream)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+void Parser<ParserPolicy>::skipWhiteSpace()
+{
+	check();
+
+	while (!atEnd() && ParserPolicy::isWhiteSpaceCharacter(currentCharacter()))
+		advance();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+void Parser<ParserPolicy>::skipLine()
+{
+	check();
+
+	while (currentCharacter() != '\n')
+		advance();
+
+	advance();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+template<typename Type>
+Type Parser<ParserPolicy>::parse()
+{
+	return parseImpl(Tag<Type>());
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+template<typename Type>
+bool Parser<ParserPolicy>::testAndReturn(const Type &expectedValue)
+{
+	const auto previousPosition = position();
+
+	const auto result = testImpl(expectedValue);
+
+	seek(previousPosition);
+
+	return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+template<typename Type>
+bool Parser<ParserPolicy>::testAndSkip(const Type &expectedValue)
+{
+	const auto previousPosition = position();
+
+	const auto result = testImpl(expectedValue);
+
+	if (result == false)
+		seek(previousPosition);
+
+	return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+template<typename Type>
+void Parser<ParserPolicy>::expect(const Type &expectedValue)
+{
+	if (testAndSkip(expectedValue))
+		return;
+
+	std::stringstream message;
+	message << "unexpected value, expected “" << expectedValue << "”";
+
+	throw ParserException(coordinate(), message.str());
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+std::string Parser<ParserPolicy>::parseIdentifier()
+{
+	skipWhiteSpace();
 
 	std::string value;
 
@@ -120,7 +203,7 @@ std::string Parser::parseIdentifier(CharacterPredicate characterPredicate, White
 	{
 		const auto character = currentCharacter();
 
-		if (!characterPredicate(character))
+		if (!ParserPolicy::isIdentifierCharacter(character))
 			return value;
 
 		value.push_back(character);
@@ -130,33 +213,342 @@ std::string Parser::parseIdentifier(CharacterPredicate characterPredicate, White
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-template<class CharacterPredicate>
+template<class ParserPolicy>
-std::string Parser::parseIdentifier(CharacterPredicate characterPredicate)
+bool Parser<ParserPolicy>::testIdentifierAndSkip(const std::string &expectedValue)
 {
-	return parseIdentifier(characterPredicate,
+	return testAndSkip(expectedValue) && !ParserPolicy::isIdentifierCharacter(currentCharacter());
-		[&](const auto character)
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::probeNumber()
+{
+	const auto previousPosition = position();
+
+	skipWhiteSpace();
+
+	while (!ParserPolicy::isWhiteSpaceCharacter(currentCharacter()))
+		if (!std::isdigit(currentCharacter()))
 		{
-			return std::isspace(character);
+			seek(previousPosition);
-		});
+
+			return false;
+		}
+
+	return true;
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-template<class CharacterPredicate>
+template<class ParserPolicy>
-bool Parser::probeIdentifier(const std::string &expectedValue, CharacterPredicate characterPredicate)
+std::string Parser<ParserPolicy>::parseLine()
 {
-	return probe<std::string>(expectedValue) && !characterPredicate(currentCharacter());
+	std::string value;
-}
 
-////////////////////////////////////////////////////////////////////////////////////////////////////
+	while (true)
-
+	{
-template<class WhiteSpacePredicate>
+		const auto character = currentCharacter();
-void Parser::skipWhiteSpace(WhiteSpacePredicate whiteSpacePredicate)
-{
-	checkStream();
-
-	while (!atEndOfStream() && whiteSpacePredicate(currentCharacter()))
 		advance();
+
+		if (character == '\n')
+			break;
+		else if (character == '\r')
+			continue;
+
+		value.push_back(character);
+	}
+
+	return value;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+void Parser<ParserPolicy>::removeComments(const std::string &startSequence, const std::string &endSequence, bool removeEnd)
+{
+	const auto inPosition = m_stream.tellg();
+	const auto outPosition = m_stream.tellp();
+
+	m_stream.seekg(0);
+
+	const auto removeRange =
+		[&](const auto &start, const auto &end)
+		{
+			BOOST_ASSERT(start != -1);
+
+			m_stream.clear();
+			m_stream.seekp(start);
+			m_stream.seekg(start);
+
+			auto position = start;
+
+			while (end == -1 || position < end)
+			{
+				m_stream.ignore(1);
+
+				if (atEnd())
+					return;
+
+				m_stream.put(' ');
+				position += static_cast<std::streamoff>(1);
+			}
+		};
+
+	while (!atEnd())
+	{
+		Position startPosition = m_stream.tellg();
+
+		while (!atEnd())
+		{
+			startPosition = m_stream.tellg();
+
+			if (testAndSkip(startSequence))
+				break;
+
+			advance();
+		}
+
+		Position endPosition = m_stream.tellg();
+
+		while (!atEnd())
+		{
+			endPosition = m_stream.tellg();
+
+			if (testAndSkip(endSequence))
+				break;
+
+			advance();
+		}
+
+		if (removeEnd)
+			endPosition = m_stream.tellg();
+
+		removeRange(startPosition, endPosition);
+	}
+
+	m_stream.clear();
+
+	m_stream.seekg(inPosition);
+	m_stream.seekp(outPosition);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+char Parser<ParserPolicy>::currentCharacter() const
+{
+	return ParserPolicy::transformCharacter(Stream::currentCharacter());
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+std::string Parser<ParserPolicy>::parseImpl(Tag<std::string>)
+{
+	skipWhiteSpace();
+
+	const auto startPosition = position();
+
+	while (!ParserPolicy::isWhiteSpaceCharacter(currentCharacter()))
+		advance();
+
+	const auto endPosition = position();
+	const auto length = static_cast<size_t>(endPosition - startPosition);
+
+	std::string value;
+	value.reserve(length);
+
+	seek(startPosition);
+
+	for (size_t i = 0; i < length; i++)
+	{
+		value.push_back(currentCharacter());
+		advance();
+	}
+
+	return value;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+char Parser<ParserPolicy>::parseImpl(Tag<char>)
+{
+	const auto value = currentCharacter();
+
+	advance();
+
+	return value;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+uint64_t Parser<ParserPolicy>::parseIntegerBody()
+{
+	check();
+
+	if (!std::isdigit(currentCharacter()))
+		throw ParserException(coordinate(), "could not parse integer value");
+
+	uint64_t value = 0;
+
+	while (!atEnd())
+	{
+		const auto character = currentCharacter();
+
+		if (!std::isdigit(character))
+			break;
+
+		value *= 10;
+		value += character - '0';
+
+		advance();
+	}
+
+	return value;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+int64_t Parser<ParserPolicy>::parseImpl(Tag<int64_t>)
+{
+	skipWhiteSpace();
+
+	bool positive = testAndSkip<char>('+') || !testAndSkip<char>('-');
+
+	const auto value = parseIntegerBody();
+
+	return (positive ? value : -value);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+uint64_t Parser<ParserPolicy>::parseImpl(Tag<uint64_t>)
+{
+	skipWhiteSpace();
+
+	if (currentCharacter() == '-')
+		throw ParserException(coordinate(), "expected unsigned integer, got signed one");
+
+	return parseIntegerBody();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+int32_t Parser<ParserPolicy>::parseImpl(Tag<int32_t>)
+{
+	return static_cast<int32_t>(parseImpl(Tag<int64_t>()));
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+uint32_t Parser<ParserPolicy>::parseImpl(Tag<uint32_t>)
+{
+	return static_cast<uint32_t>(parseImpl(Tag<uint64_t>()));
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::parseImpl(Tag<bool>)
+{
+	skipWhiteSpace();
+
+	if (testAndSkip<char>('0'))
+	    return false;
+
+	if (testAndSkip<char>('1'))
+		return true;
+
+	throw ParserException(coordinate(), "could not parse Boolean value");
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::testImpl(const std::string &expectedValue)
+{
+	if (!ParserPolicy::isWhiteSpaceCharacter(expectedValue.front()))
+		skipWhiteSpace();
+
+	const auto match = std::find_if(expectedValue.cbegin(), expectedValue.cend(),
+		[&](const auto &expectedCharacter)
+		{
+			const auto character = static_cast<char>(this->currentCharacter());
+
+			if (character != expectedCharacter)
+				return true;
+
+			this->advance();
+
+			return false;
+		});
+
+	return (match == expectedValue.cend());
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::testImpl(char expectedValue)
+{
+	const auto result = (currentCharacter() == expectedValue);
+
+	advance();
+
+	return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::testImpl(int64_t expectedValue)
+{
+	const auto value = parseImpl(Tag<int64_t>());
+
+	return (value == expectedValue);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::testImpl(uint64_t expectedValue)
+{
+	const auto value = parseImpl(Tag<uint64_t>());
+
+	return (value == expectedValue);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::testImpl(int32_t expectedValue)
+{
+	return testImpl(static_cast<int64_t>(expectedValue));
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::testImpl(uint32_t expectedValue)
+{
+	return testImpl(static_cast<uint64_t>(expectedValue));
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<class ParserPolicy>
+bool Parser<ParserPolicy>::testImpl(bool expectedValue)
+{
+	const auto value = parseImpl(Tag<bool>());
+
+	return (value == expectedValue);
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////

include/plasp/utils/ParserException.h

@@ -4,7 +4,7 @@
 #include <exception>
 #include <string>
 
-#include <plasp/utils/Parser.h>
+#include <plasp/utils/StreamCoordinate.h>
 
 namespace plasp
 {
@@ -20,18 +20,18 @@ namespace utils
 class ParserException: public std::exception
 {
 	public:
-		explicit ParserException(const utils::Parser &parser)
+		explicit ParserException(const StreamCoordinate &coordinate)
-		:	ParserException(parser, "unspecified parser error")
+		:	ParserException(coordinate, "unspecified parser error")
 		{
 		}
 
-		explicit ParserException(const utils::Parser &parser, const char *message)
+		explicit ParserException(const StreamCoordinate &coordinate, const char *message)
-		:	ParserException(parser, static_cast<std::string>(message))
+		:	ParserException(coordinate, static_cast<std::string>(message))
 		{
 		}
 
-		explicit ParserException(const utils::Parser &parser, const std::string &message)
+		explicit ParserException(const StreamCoordinate &coordinate, const std::string &message)
-		:	m_coordinate{parser.coordinate()},
+		:	m_coordinate{coordinate},
 			m_message{message},
 			m_plainMessage{m_coordinate.sectionName + ":" + std::to_string(m_coordinate.row)
 				+ ":" + std::to_string(m_coordinate.column) + " " + m_message}
@@ -47,7 +47,7 @@ class ParserException: public std::exception
 			return m_plainMessage.c_str();
 		}
 
-		const Parser::Coordinate &coordinate() const
+		const StreamCoordinate &coordinate() const
 		{
 			return m_coordinate;
 		}
@@ -58,7 +58,7 @@ class ParserException: public std::exception
 		}
 
 	private:
-		Parser::Coordinate m_coordinate;
+		StreamCoordinate m_coordinate;
 		std::string m_message;
 		std::string m_plainMessage;
 };

include/plasp/utils/ParserPolicy.h

@@ -0,0 +1,62 @@
+#ifndef __PLASP__UTILS__PARSER_POLICY_H
+#define __PLASP__UTILS__PARSER_POLICY_H
+
+#include <iostream>
+
+namespace plasp
+{
+namespace utils
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// ParserPolicy
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+class CaseSensitiveParserPolicy
+{
+	public:
+		static constexpr char transformCharacter(char c) noexcept
+		{
+			return c;
+		}
+
+		static bool isWhiteSpaceCharacter(char c)
+		{
+			return std::iswspace(c);
+		}
+
+		static bool isIdentifierCharacter(char c)
+		{
+			return std::isgraph(c);
+		}
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+class CaseInsensitiveParserPolicy
+{
+	public:
+		static char transformCharacter(char c) noexcept
+		{
+			return std::tolower(c);
+		}
+
+		static bool isWhiteSpaceCharacter(char c)
+		{
+			return std::iswspace(c);
+		}
+
+		static bool isIdentifierCharacter(char c)
+		{
+			return std::isgraph(c);
+		}
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}
+
+#endif

include/plasp/utils/Stream.h

@@ -0,0 +1,84 @@
+#ifndef __PLASP__UTILS__STREAM_H
+#define __PLASP__UTILS__STREAM_H
+
+#include <iostream>
+#include <iterator>
+#include <sstream>
+#include <vector>
+
+#include <boost/filesystem.hpp>
+
+#include <plasp/utils/ParserException.h>
+#include <plasp/utils/StreamCoordinate.h>
+
+namespace plasp
+{
+namespace utils
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Stream
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+class Stream
+{
+	public:
+		using Position = std::stringstream::pos_type;
+
+		struct Delimiter
+		{
+			Position position;
+			std::string sectionName;
+		};
+
+	public:
+		explicit Stream();
+		explicit Stream(std::string streamName, std::istream &istream);
+
+		Stream(const Stream &other) = delete;
+		Stream &operator=(const Stream &other) = delete;
+
+		Stream(Stream &&other)
+		:	m_stream{std::move(other.m_stream)},
+			m_delimiters{std::move(other.m_delimiters)}
+		{
+		}
+
+		Stream &operator=(Stream &&other)
+		{
+			m_stream = std::move(other.m_stream);
+			m_delimiters = std::move(other.m_delimiters);
+
+			return *this;
+		}
+
+		~Stream() = default;
+
+		void read(std::string streamName, std::istream &istream);
+		void read(const boost::filesystem::path &path);
+
+		void reset();
+		void seek(Position position);
+		Position position() const;
+		StreamCoordinate coordinate() const;
+
+		char currentCharacter() const;
+		void advance();
+		bool atEnd() const;
+
+		void check() const;
+
+	protected:
+		mutable std::stringstream m_stream;
+
+		std::vector<Delimiter> m_delimiters;
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}
+
+#endif

include/plasp/utils/StreamCoordinate.h

@@ -1,28 +1,25 @@
-#ifndef __PLASP__PDDL__IDENTIFIER_H
+#ifndef __PLASP__UTILS__STREAM_COORDINATE_H
-#define __PLASP__PDDL__IDENTIFIER_H
+#define __PLASP__UTILS__STREAM_COORDINATE_H
 
-#include <cctype>
+#include <string>
 
 namespace plasp
 {
-namespace pddl
+namespace utils
 {
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 //
-// Identifier
+// StreamCoordinate
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-const auto isIdentifier =
+struct StreamCoordinate
-	[](const auto character)
+{
-	{
+	std::string sectionName;
-		return character != '?'
+	size_t row;
-			&& character != '('
+	size_t column;
-			&& character != ')'
+};
-			&& character != ';'
-			&& std::isgraph(character);
-	};
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 

src/plasp/pddl/Action.cpp

@@ -5,10 +5,8 @@
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Domain.h>
 #include <plasp/pddl/ExpressionContext.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/expressions/Type.h>
 #include <plasp/utils/IO.h>
-#include <plasp/utils/ParserException.h>
 
 namespace plasp
 {
@@ -23,31 +21,33 @@ namespace pddl
 
 void Action::parseDeclaration(Context &context, Domain &domain)
 {
+	auto &parser = context.parser;
+
 	auto action = std::make_unique<Action>(Action());
 
-	action->m_name = context.parser.parseIdentifier(isIdentifier);
+	action->m_name = parser.parseIdentifier();
 
-	context.parser.expect<std::string>(":parameters");
+	parser.expect<std::string>(":parameters");
-	context.parser.expect<std::string>("(");
+	parser.expect<std::string>("(");
 
 	ExpressionContext expressionContext(domain, action->m_parameters);
 
 	// Read parameters
 	expressions::Variable::parseTypedDeclarations(context, expressionContext);
 
-	context.parser.expect<std::string>(")");
+	parser.expect<std::string>(")");
 
 	// Parse preconditions and effects
-	while (context.parser.currentCharacter() != ')')
+	while (!parser.testAndReturn(')'))
 	{
-		context.parser.expect<std::string>(":");
+		parser.expect<std::string>(":");
 
-		if (context.parser.probeIdentifier("precondition", isIdentifier))
+		if (parser.testIdentifierAndSkip("precondition"))
 			action->m_precondition = parsePreconditionExpression(context, expressionContext);
-		else if (context.parser.probeIdentifier("effect", isIdentifier))
+		else if (parser.testIdentifierAndSkip("effect"))
 			action->m_effect = parseEffectExpression(context, expressionContext);
 
-		context.parser.skipWhiteSpace();
+		parser.skipWhiteSpace();
 	}
 
 	// Store new action

src/plasp/pddl/Description.cpp

@@ -44,7 +44,7 @@ Description Description::fromStream(std::istream &istream)
 {
 	Description description;
 
-	description.m_context.parser.readStream("std::cin", istream);
+	description.m_context.parser.read("std::cin", istream);
 	description.parse();
 
 	return description;
@@ -56,7 +56,7 @@ Description Description::fromFile(const std::string &path)
 {
 	Description description;
 
-	description.m_context.parser.readFile(path);
+	description.m_context.parser.read(path);
 	description.parse();
 
 	return description;
@@ -73,7 +73,7 @@ Description Description::fromFiles(const std::vector<std::string> &paths)
 	std::for_each(paths.cbegin(), paths.cend(),
 		[&](const auto &path)
 		{
-			description.m_context.parser.readFile(path);
+			description.m_context.parser.read(path);
 		});
 
 	description.parse();
@@ -126,7 +126,6 @@ void Description::parse()
 {
 	auto &parser = m_context.parser;
 
-	parser.setCaseSensitive(false);
 	parser.removeComments(";", "\n", false);
 
 	// First, determine the locations of domain and problem
@@ -155,7 +154,7 @@ void Description::findSections()
 
 	parser.skipWhiteSpace();
 
-	while (!parser.atEndOfStream())
+	while (!parser.atEnd())
 	{
 		const auto position = parser.position();
 
@@ -163,20 +162,20 @@ void Description::findSections()
 		parser.expect<std::string>("define");
 		parser.expect<std::string>("(");
 
-		if (parser.probe<std::string>("domain"))
+		if (parser.testAndSkip<std::string>("domain"))
 		{
 			if (m_domainPosition != -1)
-				throw utils::ParserException(parser, "PDDL description may not contain two domains");
+				throw utils::ParserException(parser.coordinate(), "PDDL description may not contain two domains");
 
 			m_domainPosition = position;
 
 			parser.seek(position);
 			m_domain->findSections();
 		}
-		else if (m_context.parser.probe<std::string>("problem"))
+		else if (m_context.parser.testAndSkip<std::string>("problem"))
 		{
 			if (m_problemPosition != -1)
-				throw utils::ParserException(parser, "PDDL description may currently not contain two problems");
+				throw utils::ParserException(parser.coordinate(), "PDDL description may currently not contain two problems");
 
 			m_problem = std::make_unique<Problem>(Problem(m_context, *m_domain));
 
@@ -188,7 +187,7 @@ void Description::findSections()
 		else
 		{
 			const auto sectionIdentifier = parser.parse<std::string>();
-			throw utils::ParserException(parser, "unknown PDDL section “" + sectionIdentifier + "”");
+			throw utils::ParserException(parser.coordinate(), "unknown PDDL section “" + sectionIdentifier + "”");
 		}
 
 		m_context.parser.skipWhiteSpace();

src/plasp/pddl/Domain.cpp

@@ -3,7 +3,6 @@
 #include <algorithm>
 
 #include <plasp/pddl/ConsistencyException.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/IO.h>
 #include <plasp/pddl/expressions/Constant.h>
 #include <plasp/pddl/expressions/PredicateDeclaration.h>
@@ -43,7 +42,7 @@ void Domain::findSections()
 	parser.expect<std::string>("(");
 	parser.expect<std::string>("domain");
 
-	m_name = m_context.parser.parseIdentifier(isIdentifier);
+	m_name = m_context.parser.parseIdentifier();
 
 	parser.expect<std::string>(")");
 
@@ -53,7 +52,7 @@ void Domain::findSections()
 			if (unique && sectionPosition != -1)
 			{
 				parser.seek(value);
-				throw utils::ParserException(parser, "only one “:" + sectionName + "” section allowed");
+				throw utils::ParserException(parser.coordinate(), "only one “:" + sectionName + "” section allowed");
 			}
 
 			sectionPosition = value;
@@ -72,38 +71,38 @@ void Domain::findSections()
 		const auto sectionIdentifierPosition = parser.position();
 
 		// Save the parser position of the individual sections for later parsing
-		if (parser.probeIdentifier("requirements", isIdentifier))
+		if (parser.testIdentifierAndSkip("requirements"))
 			setSectionPosition("requirements", m_requirementsPosition, position, true);
-		else if (parser.probeIdentifier("types", isIdentifier))
+		else if (parser.testIdentifierAndSkip("types"))
 			setSectionPosition("types", m_typesPosition, position, true);
-		else if (parser.probeIdentifier("constants", isIdentifier))
+		else if (parser.testIdentifierAndSkip("constants"))
 			setSectionPosition("constants", m_constantsPosition, position, true);
-		else if (parser.probeIdentifier("predicates", isIdentifier))
+		else if (parser.testIdentifierAndSkip("predicates"))
 			setSectionPosition("predicates", m_predicatesPosition, position, true);
-		else if (parser.probeIdentifier("action", isIdentifier))
+		else if (parser.testIdentifierAndSkip("action"))
 		{
 			m_actionPositions.emplace_back(-1);
 			setSectionPosition("action", m_actionPositions.back(), position);
 		}
-		else if (parser.probeIdentifier("functions", isIdentifier)
+		else if (parser.testIdentifierAndSkip("functions")
-			|| parser.probeIdentifier("constraints", isIdentifier)
+			|| parser.testIdentifierAndSkip("constraints")
-			|| parser.probeIdentifier("durative-action", isIdentifier)
+			|| parser.testIdentifierAndSkip("durative-action")
-			|| parser.probeIdentifier("derived", isIdentifier))
+			|| parser.testIdentifierAndSkip("derived"))
 		{
 			parser.seek(sectionIdentifierPosition);
 
-			const auto sectionIdentifier = parser.parseIdentifier(isIdentifier);
+			const auto sectionIdentifier = parser.parseIdentifier();
 
-			m_context.logger.logWarning(parser, "section type “" + sectionIdentifier + "” currently unsupported");
+			m_context.logger.logWarning(parser.coordinate(), "section type “" + sectionIdentifier + "” currently unsupported");
 
 			parser.seek(sectionIdentifierPosition);
 		}
 		else
 		{
-			const auto sectionIdentifier = parser.parseIdentifier(isIdentifier);
+			const auto sectionIdentifier = parser.parseIdentifier();
 
 			parser.seek(position);
-			throw utils::ParserException(m_context.parser, "unknown domain section “" + sectionIdentifier + "”");
+			throw utils::ParserException(parser.coordinate(), "unknown domain section “" + sectionIdentifier + "”");
 		}
 
 		// Skip section for now and parse it later
@@ -340,7 +339,7 @@ void Domain::parseTypeSection()
 	while (parser.currentCharacter() != ')')
 	{
 		if (parser.currentCharacter() == '(')
-			throw utils::ParserException(parser, "only primitive types are allowed in type section");
+			throw utils::ParserException(parser.coordinate(), "only primitive types are allowed in type section");
 
 		expressions::PrimitiveType::parseTypedDeclaration(m_context, *this);
 

src/plasp/pddl/Expression.cpp

@@ -3,7 +3,6 @@
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Domain.h>
 #include <plasp/pddl/ExpressionContext.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/IO.h>
 #include <plasp/pddl/expressions/And.h>
 #include <plasp/pddl/expressions/Imply.h>
@@ -49,12 +48,12 @@ ExpressionPointer parsePreconditionExpression(Context &context,
 
 	const auto expressionIdentifierPosition = parser.position();
 
-	if (parser.probeIdentifier("forall", isIdentifier)
+	if (parser.testIdentifierAndSkip("forall")
-		|| parser.probeIdentifier("preference", isIdentifier))
+		|| parser.testIdentifierAndSkip("preference"))
 	{
 		// TODO: refactor
 		parser.seek(expressionIdentifierPosition);
-		const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+		const auto expressionIdentifier = parser.parseIdentifier();
 
 		parser.seek(position);
 		return expressions::Unsupported::parse(context);
@@ -89,32 +88,32 @@ ExpressionPointer parseExpression(Context &context, ExpressionContext &expressio
 
 	const auto expressionIdentifierPosition = parser.position();
 
-	if (parser.probeIdentifier("exists", isIdentifier)
+	if (parser.testIdentifierAndSkip("exists")
-		|| parser.probeIdentifier("forall", isIdentifier)
+		|| parser.testIdentifierAndSkip("forall")
-		|| parser.probeIdentifier("-", isIdentifier)
+		|| parser.testIdentifierAndSkip("-")
-		|| parser.probeIdentifier("=", isIdentifier)
+		|| parser.testIdentifierAndSkip("=")
-		|| parser.probeIdentifier("*", isIdentifier)
+		|| parser.testIdentifierAndSkip("*")
-		|| parser.probeIdentifier("+", isIdentifier)
+		|| parser.testIdentifierAndSkip("+")
-		|| parser.probeIdentifier("-", isIdentifier)
+		|| parser.testIdentifierAndSkip("-")
-		|| parser.probeIdentifier("/", isIdentifier)
+		|| parser.testIdentifierAndSkip("/")
-		|| parser.probeIdentifier(">", isIdentifier)
+		|| parser.testIdentifierAndSkip(">")
-		|| parser.probeIdentifier("<", isIdentifier)
+		|| parser.testIdentifierAndSkip("<")
-		|| parser.probeIdentifier("=", isIdentifier)
+		|| parser.testIdentifierAndSkip("=")
-		|| parser.probeIdentifier(">=", isIdentifier)
+		|| parser.testIdentifierAndSkip(">=")
-		|| parser.probeIdentifier("<=", isIdentifier))
+		|| parser.testIdentifierAndSkip("<="))
 	{
 		parser.seek(expressionIdentifierPosition);
-		const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+		const auto expressionIdentifier = parser.parseIdentifier();
 
 		parser.seek(position);
 		return expressions::Unsupported::parse(context);
 	}
 
 	parser.seek(expressionIdentifierPosition);
-	const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+	const auto expressionIdentifier = parser.parseIdentifier();
 
 	parser.seek(position);
-	throw utils::ParserException(context.parser, "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
+	throw utils::ParserException(parser.coordinate(), "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -134,11 +133,11 @@ ExpressionPointer parseEffectExpression(Context &context, ExpressionContext &exp
 
 	const auto expressionIdentifierPosition = parser.position();
 
-	if (parser.probeIdentifier("forall", isIdentifier)
+	if (parser.testIdentifierAndSkip("forall")
-		|| parser.probeIdentifier("when", isIdentifier))
+		|| parser.testIdentifierAndSkip("when"))
 	{
 		parser.seek(expressionIdentifierPosition);
-		const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+		const auto expressionIdentifier = parser.parseIdentifier();
 
 		parser.seek(position);
 		return expressions::Unsupported::parse(context);
@@ -168,37 +167,39 @@ ExpressionPointer parseEffectBodyExpression(Context &context, ExpressionContext
 
 	const auto expressionIdentifierPosition = parser.position();
 
-	if (parser.probeIdentifier("=", isIdentifier)
+	if (parser.testIdentifierAndSkip("=")
-		|| parser.probeIdentifier("assign", isIdentifier)
+		|| parser.testIdentifierAndSkip("assign")
-		|| parser.probeIdentifier("scale-up", isIdentifier)
+		|| parser.testIdentifierAndSkip("scale-up")
-		|| parser.probeIdentifier("scale-down", isIdentifier)
+		|| parser.testIdentifierAndSkip("scale-down")
-		|| parser.probeIdentifier("increase", isIdentifier)
+		|| parser.testIdentifierAndSkip("increase")
-		|| parser.probeIdentifier("decrease", isIdentifier))
+		|| parser.testIdentifierAndSkip("decrease"))
 	{
 		parser.seek(expressionIdentifierPosition);
-		const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+		const auto expressionIdentifier = parser.parseIdentifier();
 
 		parser.seek(position);
 		return expressions::Unsupported::parse(context);
 	}
 
 	parser.seek(expressionIdentifierPosition);
-	const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+	const auto expressionIdentifier = parser.parseIdentifier();
 
 	parser.seek(position);
-	throw utils::ParserException(context.parser, "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
+	throw utils::ParserException(parser.coordinate(), "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 ExpressionPointer parsePredicate(Context &context, ExpressionContext &expressionContext)
 {
+	auto &parser = context.parser;
+
 	ExpressionPointer expression;
 
 	if ((expression = expressions::Predicate::parse(context, expressionContext)))
 		return expression;
 
-	throw utils::ParserException(context.parser, "expected predicate");
+	throw utils::ParserException(parser.coordinate(), "expected predicate");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -229,15 +230,15 @@ ExpressionPointer parseAtomicFormula(Context &context, ExpressionContext &expres
 
 	const auto position = parser.position();
 
-	if (!parser.probe<std::string>("("))
+	if (!parser.testAndSkip<std::string>("("))
 		return nullptr;
 
 	const auto expressionIdentifierPosition = parser.position();
 
-	if (parser.probeIdentifier("=", isIdentifier))
+	if (parser.testIdentifierAndSkip("="))
 	{
 		parser.seek(expressionIdentifierPosition);
-		const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+		const auto expressionIdentifier = parser.parseIdentifier();
 
 		parser.seek(position);
 		return expressions::Unsupported::parse(context);

src/plasp/pddl/InitialState.cpp

@@ -2,7 +2,6 @@
 
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/ExpressionContext.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/IO.h>
 #include <plasp/pddl/Problem.h>
 #include <plasp/pddl/expressions/At.h>
@@ -46,20 +45,20 @@ std::unique_ptr<InitialState> InitialState::parseDeclaration(Context &context,
 
 			const auto expressionIdentifierPosition = parser.position();
 
-			if (parser.probeIdentifier("=", isIdentifier))
+			if (parser.testIdentifierAndSkip("="))
 			{
 				parser.seek(expressionIdentifierPosition);
-				const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+				const auto expressionIdentifier = parser.parseIdentifier();
 
 				parser.seek(position);
 				return expressions::Unsupported::parse(context);
 			}
 
 			parser.seek(expressionIdentifierPosition);
-			const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
+			const auto expressionIdentifier = parser.parseIdentifier();
 
 			parser.seek(position);
-			throw utils::ParserException(parser, "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
+			throw utils::ParserException(parser.coordinate(), "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
 		};
 
 	parser.skipWhiteSpace();

src/plasp/pddl/Problem.cpp

@@ -4,7 +4,6 @@
 
 #include <plasp/pddl/Domain.h>
 #include <plasp/pddl/ExpressionContext.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/IO.h>
 #include <plasp/pddl/expressions/Constant.h>
 #include <plasp/utils/IO.h>
@@ -43,7 +42,7 @@ void Problem::findSections()
 	parser.expect<std::string>("(");
 	parser.expect<std::string>("problem");
 
-	m_name = parser.parseIdentifier(isIdentifier);
+	m_name = parser.parseIdentifier();
 
 	parser.expect<std::string>(")");
 
@@ -53,7 +52,7 @@ void Problem::findSections()
 		if (unique && sectionPosition != -1)
 		{
 			parser.seek(value);
-			throw utils::ParserException(parser, "only one “:" + sectionName + "” section allowed");
+			throw utils::ParserException(parser.coordinate(), "only one “:" + sectionName + "” section allowed");
 		}
 
 		sectionPosition = value;
@@ -71,34 +70,34 @@ void Problem::findSections()
 		const auto sectionIdentifierPosition = parser.position();
 
 		// TODO: check order of the sections
-		if (parser.probeIdentifier("domain", isIdentifier))
+		if (parser.testIdentifierAndSkip("domain"))
 			setSectionPosition("domain", m_domainPosition, position, true);
-		else if (parser.probeIdentifier("requirements", isIdentifier))
+		else if (parser.testIdentifierAndSkip("requirements"))
 			setSectionPosition("requirements", m_requirementsPosition, position, true);
-		else if (parser.probeIdentifier("objects", isIdentifier))
+		else if (parser.testIdentifierAndSkip("objects"))
 			setSectionPosition("objects", m_objectsPosition, position, true);
-		else if (parser.probeIdentifier("init", isIdentifier))
+		else if (parser.testIdentifierAndSkip("init"))
 			setSectionPosition("init", m_initialStatePosition, position, true);
-		else if (parser.probeIdentifier("goal", isIdentifier))
+		else if (parser.testIdentifierAndSkip("goal"))
 			setSectionPosition("goal", m_goalPosition, position, true);
-		else if (parser.probeIdentifier("constraints", isIdentifier)
+		else if (parser.testIdentifierAndSkip("constraints")
-			|| parser.probeIdentifier("metric", isIdentifier)
+			|| parser.testIdentifierAndSkip("metric")
-			|| parser.probeIdentifier("length", isIdentifier))
+			|| parser.testIdentifierAndSkip("length"))
 		{
 			parser.seek(sectionIdentifierPosition);
 
-			const auto sectionIdentifier = parser.parseIdentifier(isIdentifier);
+			const auto sectionIdentifier = parser.parseIdentifier();
 
-			m_context.logger.logWarning(parser, "section type “" + sectionIdentifier + "” currently unsupported");
+			m_context.logger.logWarning(parser.coordinate(), "section type “" + sectionIdentifier + "” currently unsupported");
 
 			parser.seek(sectionIdentifierPosition);
 		}
 		else
 		{
-			const auto sectionIdentifier = parser.parseIdentifier(isIdentifier);
+			const auto sectionIdentifier = parser.parseIdentifier();
 
 			parser.seek(position);
-			throw utils::ParserException(m_context.parser, "unknown problem section “" + sectionIdentifier + "”");
+			throw utils::ParserException(parser.coordinate(), "unknown problem section “" + sectionIdentifier + "”");
 		}
 
 		// Skip section for now and parse it later
@@ -201,10 +200,10 @@ void Problem::parseDomainSection()
 
 	parser.skipWhiteSpace();
 
-	const auto domainName = parser.parseIdentifier(isIdentifier);
+	const auto domainName = parser.parseIdentifier();
 
 	if (m_domain.name() != domainName)
-		throw utils::ParserException(parser, "domains do not match (“" + m_domain.name() + "” and “" + domainName + "”)");
+		throw utils::ParserException(parser.coordinate(), "domains do not match (“" + m_domain.name() + "” and “" + domainName + "”)");
 
 	parser.expect<std::string>(")");
 }

src/plasp/pddl/Requirement.cpp

@@ -4,7 +4,6 @@
 #include <boost/assign.hpp>
 #include <boost/bimap.hpp>
 
-#include <plasp/pddl/Identifier.h>
 #include <plasp/utils/IO.h>
 #include <plasp/utils/ParserException.h>
 
@@ -84,17 +83,19 @@ Requirement::Requirement(Requirement::Type type)
 
 Requirement Requirement::parse(Context &context)
 {
-	const auto requirementName = context.parser.parseIdentifier(isIdentifier);
+	auto &parser = context.parser;
+
+	const auto requirementName = parser.parseIdentifier();
 
 	const auto match = requirementTypesToPDDL.right.find(requirementName);
 
 	if (match == requirementTypesToPDDL.right.end())
-		throw utils::ParserException(context.parser, "unknown PDDL requirement “" + requirementName + "”");
+		throw utils::ParserException(parser.coordinate(), "unknown PDDL requirement “" + requirementName + "”");
 
 	const auto requirementType = match->second;
 
 	if (requirementType == Requirement::Type::GoalUtilities)
-		context.logger.logWarning(context.parser, "requirement “goal-utilities” is not part of the PDDL 3.1 specification");
+		context.logger.logWarning(parser.coordinate(), "requirement “goal-utilities” is not part of the PDDL 3.1 specification");
 
 	return Requirement(match->second);
 }

src/plasp/pddl/TranslatorASP.cpp

@@ -85,7 +85,10 @@ void TranslatorASP::translateTypes() const
 
 	if (types.empty())
 	{
-		m_outputStream << utils::Keyword("type") << "(object)." << std::endl;
+		m_outputStream
+			<< utils::Keyword("type") << "("
+			<< utils::Keyword("type") << "(object))." << std::endl;
+
 		return;
 	}
 
@@ -94,7 +97,10 @@ void TranslatorASP::translateTypes() const
 		{
 			const auto typeName = utils::escapeASP(type->name());
 
-			m_outputStream << utils::Keyword("type") << "(" << typeName << ")." << std::endl;
+			m_outputStream
+				<< utils::Keyword("type") << "("
+				<< utils::Keyword("type") << "("
+				<< typeName << "))." << std::endl;
 
 			const auto &parentTypes = type->parentTypes();
 
@@ -108,9 +114,9 @@ void TranslatorASP::translateTypes() const
 						<< "(" << typeName << "), " << utils::Keyword("type")
 						<< "(" << parentTypeName << "))." << std::endl
 
-						<< utils::Keyword("hasType") << "(" << utils::Variable("X") << ", "
+						<< utils::Keyword("has") << "(" << utils::Variable("X") << ", "
 						<< utils::Keyword("type") << "(" << parentTypeName << ")) :- "
-						<< utils::Keyword("hasType") << "(" << utils::Variable("X") << ", "
+						<< utils::Keyword("has") << "(" << utils::Variable("X") << ", "
 						<< utils::Keyword("type") << "(" << typeName << "))." << std::endl;
 				});
 		});
@@ -120,27 +126,59 @@ void TranslatorASP::translateTypes() const
 
 void TranslatorASP::translatePredicates() const
 {
-	m_outputStream << utils::Heading2("predicates");
+	m_outputStream << utils::Heading2("variables");
 
 	const auto &predicates = m_description.domain().predicates();
 
+	const auto printPredicateName =
+		[&](const auto &predicate)
+		{
+			m_outputStream
+				<< utils::escapeASP(predicate->name());
+
+			this->translateVariablesHead(predicate->arguments());
+		};
+
+	const auto printValueRule =
+		[&](const auto &predicate, const auto &value)
+		{
+			m_outputStream
+				<< utils::Keyword("contains") << "("
+				<< utils::Keyword("variable") << "(";
+
+			printPredicateName(predicate);
+
+			m_outputStream
+				<< "), " << utils::Keyword("value") << "(";
+
+			printPredicateName(predicate);
+
+			m_outputStream << ", " << utils::Keyword(value) << "))";
+
+			this->translateVariablesBody(predicate->arguments());
+
+			m_outputStream << "." << std::endl;
+		};
+
 	std::for_each(predicates.cbegin(), predicates.cend(),
 		[&](const auto &predicate)
 		{
-			m_outputStream << std::endl;
+			m_outputStream
+				<< std::endl
+				<< utils::Keyword("variable") << "("
+				<< utils::Keyword("variable") << "(";
 
-			m_outputStream << utils::Keyword("predicate") << "(" << utils::escapeASP(predicate->name());
+			printPredicateName(predicate);
 
-			this->translateVariablesHead(predicate->arguments());
+			m_outputStream << "))";
-
-			m_outputStream << ")";
 
 			this->translateVariablesBody(predicate->arguments());
 
-			m_outputStream << ".";
+			m_outputStream << "." << std::endl;
-		});
 
-	m_outputStream << std::endl;
+			printValueRule(predicate, "true");
+			printValueRule(predicate, "false");
+		});
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -164,28 +202,35 @@ void TranslatorASP::translateActions() const
 	std::for_each(actions.cbegin(), actions.cend(),
 		[&](const auto &action)
 		{
+			// TODO: rename
 			const auto translateLiteral =
-				[&](const auto &ruleHead, const auto &literal)
+				[&](const auto &ruleHead, const auto &literal, bool enumerateEffects = false)
 				{
 					m_outputStream << std::endl << utils::Keyword(ruleHead) << "(";
 
 					printActionName(*action);
 
+					// TODO: implement conditional effects
+					if (enumerateEffects)
+						m_outputStream << ", " << utils::Keyword("effect") << "(unconditional)";
+
 					m_outputStream << ", ";
 
 					this->translateLiteral(literal);
 
-					m_outputStream << ") :- ";
+					m_outputStream << ") :- " << utils::Keyword("action") << "(";
 
 					printActionName(*action);
 
-					m_outputStream << ".";
+					m_outputStream << ").";
 				};
 
 			m_outputStream << std::endl;
 
 			// Name
+			m_outputStream << utils::Keyword("action") << "(";
 			printActionName(*action);
+			m_outputStream << ")";
 
 			this->translateVariablesBody(action->parameters());
 
@@ -225,7 +270,7 @@ void TranslatorASP::translateActions() const
 				if (effect.expressionType() == Expression::Type::Predicate
 					|| effect.expressionType() == Expression::Type::Not)
 				{
-					translateLiteral("postcondition", effect);
+					translateLiteral("postcondition", effect, true);
 				}
 				// Assuming a conjunction
 				else
@@ -238,7 +283,7 @@ void TranslatorASP::translateActions() const
 					std::for_each(andExpression.arguments().cbegin(), andExpression.arguments().cend(),
 						[&](const auto *argument)
 						{
-							translateLiteral("postcondition", *argument);
+							translateLiteral("postcondition", *argument, true);
 						});
 				}
 			}
@@ -258,20 +303,23 @@ void TranslatorASP::translateConstants(const std::string &heading, const express
 		{
 			const auto constantName = utils::escapeASP(constant->name());
 
-			m_outputStream << std::endl << utils::Keyword("constant")
+			m_outputStream << std::endl
-				<< "(" << constantName << ")." << std::endl;
+				<< utils::Keyword("constant") << "("
+				<< utils::Keyword("constant") << "("
+				<< constantName
+				<< "))." << std::endl;
 
 			const auto *type = constant->type();
 
 			if (type != nullptr)
 			{
-				m_outputStream << utils::Keyword("hasType") << "("
+				m_outputStream << utils::Keyword("has") << "("
 					<< utils::Keyword("constant") << "(" << constantName << "), "
 					<< utils::Keyword("type") << "(" << utils::escapeASP(type->name()) << "))." << std::endl;
 			}
 			else
 			{
-				m_outputStream << utils::Keyword("hasType") << "("
+				m_outputStream << utils::Keyword("has") << "("
 					<< utils::Keyword("constant") << "(" << constantName << "), "
 					<< utils::Keyword("type") << "(object))." << std::endl;
 			}
@@ -323,13 +371,13 @@ void TranslatorASP::translateVariablesBody(const expressions::Variables &variabl
 
 			const auto &type = *dynamic_cast<const expressions::PrimitiveType *>(variable.type());
 
-			m_outputStream << utils::Keyword("hasType") << "("
+			m_outputStream << utils::Keyword("has") << "("
 				<< utils::Variable(utils::escapeASPVariable(variable.name())) << ", "
 				<< utils::Keyword("type") << "(" << utils::escapeASP(type.name()) << "))";
 		}
 		else
 		{
-			m_outputStream << utils::Keyword("hasType") << "("
+			m_outputStream << utils::Keyword("has") << "("
 				<< utils::Variable(utils::escapeASPVariable(variable.name())) << ", "
 				<< utils::Keyword("type") << "(object))";
 		}
@@ -343,8 +391,13 @@ void TranslatorASP::translateLiteral(const Expression &literal) const
 	// Translate single predicate
 	if (literal.expressionType() == Expression::Type::Predicate)
 	{
-		this->translatePredicate(dynamic_cast<const expressions::Predicate &>(literal));
+		const auto &predicate = dynamic_cast<const expressions::Predicate &>(literal);
-		m_outputStream << ", " << utils::Keyword("true");
+
+		m_outputStream << utils::Keyword("variable") << "(";
+		this->translatePredicate(predicate);
+		m_outputStream << "), " << utils::Keyword("value") << "(";
+		this->translatePredicate(predicate);
+		m_outputStream << ", " << utils::Keyword("true") << ")";
 	}
 	// Assuming that "not" expression may only contain a predicate
 	else if (literal.expressionType() == Expression::Type::Not)
@@ -352,8 +405,11 @@ void TranslatorASP::translateLiteral(const Expression &literal) const
 		const auto &notExpression = dynamic_cast<const expressions::Not &>(literal);
 		const auto &predicate = dynamic_cast<const expressions::Predicate &>(*notExpression.argument());
 
+		m_outputStream << utils::Keyword("variable") << "(";
 		this->translatePredicate(predicate);
-		m_outputStream << ", " << utils::Keyword("false");
+		m_outputStream << "), " << utils::Keyword("value") << "(";
+		this->translatePredicate(predicate);
+		m_outputStream << ", " << utils::Keyword("false") << ")";
 	}
 	else
 		throw utils::TranslatorException("only primitive predicates and their negations supported as literals currently");
@@ -363,13 +419,12 @@ void TranslatorASP::translateLiteral(const Expression &literal) const
 
 void TranslatorASP::translatePredicate(const expressions::Predicate &predicate) const
 {
-	m_outputStream << utils::Keyword("predicate") << "(" << utils::escapeASP(predicate.name());
+	m_outputStream << utils::escapeASP(predicate.name());
 
 	const auto &arguments = predicate.arguments();
 
 	if (arguments.empty())
 	{
-		m_outputStream << ")";
 		return;
 	}
 
@@ -396,7 +451,7 @@ void TranslatorASP::translatePredicate(const expressions::Predicate &predicate)
 			throw utils::TranslatorException("only variables and constants supported in predicates currently");
 	}
 
-	m_outputStream << "))";
+	m_outputStream << ")";
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -442,7 +497,15 @@ void TranslatorASP::translateInitialState() const
 
 			// Translate single predicate
 			if (fact->expressionType() == Expression::Type::Predicate)
-				this->translatePredicate(dynamic_cast<const expressions::Predicate &>(*fact));
+			{
+				const auto &predicate = dynamic_cast<const expressions::Predicate &>(*fact);
+
+				m_outputStream << utils::Keyword("variable") << "(";
+				this->translatePredicate(predicate);
+				m_outputStream << "), " << utils::Keyword("value") << "(";
+				this->translatePredicate(predicate);
+				m_outputStream << ", " << utils::Keyword("true") << ")";
+			}
 			// Assuming that "not" expression may only contain a predicate
 			else if (fact->expressionType() == Expression::Type::Not)
 			{

src/plasp/pddl/expressions/Constant.cpp

@@ -37,7 +37,7 @@ ConstantPointer Constant::parseDeclaration(Context &context)
 
 	auto constant = std::make_unique<Constant>(Constant());
 
-	constant->m_name = context.parser.parseIdentifier(isIdentifier);
+	constant->m_name = context.parser.parseIdentifier();
 
 	BOOST_ASSERT(constant->m_name != "-");
 
@@ -71,7 +71,7 @@ void Constant::parseTypedDeclaration(Context &context, Domain &domain, Constants
 	context.parser.skipWhiteSpace();
 
 	// Check for typing information
-	if (!context.parser.probe('-'))
+	if (!context.parser.testAndSkip<char>('-'))
 		return;
 
 	// If existing, parse and store parent type
@@ -113,7 +113,7 @@ void Constant::parseTypedDeclarations(Context &context, Domain &domain)
 		domain.checkRequirement(Requirement::Type::Typing);
 	// If no types are given, check that typing is not a requirement
 	else if (domain.hasRequirement(Requirement::Type::Typing))
-		throw utils::ParserException(parser, "constant has undeclared type");
+		throw utils::ParserException(parser.coordinate(), "constant has undeclared type");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -140,32 +140,36 @@ void Constant::parseTypedDeclarations(Context &context, Problem &problem)
 		problem.checkRequirement(Requirement::Type::Typing);
 	// If no types are given, check that typing is not a requirement
 	else if (problem.hasRequirement(Requirement::Type::Typing))
-		throw utils::ParserException(context.parser, "constant has undeclared type");
+		throw utils::ParserException(parser.coordinate(), "constant has undeclared type");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 Constant *Constant::parseAndFind(Context &context, const Domain &domain)
 {
-	context.parser.skipWhiteSpace();
+	auto &parser = context.parser;
 
-	const auto constantName = context.parser.parseIdentifier(isIdentifier);
+	parser.skipWhiteSpace();
+
+	const auto constantName = parser.parseIdentifier();
 
 	auto *constant = parseAndFind(constantName, domain.constants());
 
 	if (constant != nullptr)
 		return constant;
 
-	throw utils::ParserException(context.parser, "constant “" + constantName + "” used but never declared");
+	throw utils::ParserException(parser.coordinate(), "constant “" + constantName + "” used but never declared");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 Constant *Constant::parseAndFind(Context &context, const Problem &problem)
 {
-	context.parser.skipWhiteSpace();
+	auto &parser = context.parser;
 
-	const auto constantName = context.parser.parseIdentifier(isIdentifier);
+	parser.skipWhiteSpace();
+
+	const auto constantName = parser.parseIdentifier();
 
 	auto *constant = parseAndFind(constantName, problem.domain().constants());
 
@@ -177,7 +181,7 @@ Constant *Constant::parseAndFind(Context &context, const Problem &problem)
 	if (constant)
 		return constant;
 
-	throw utils::ParserException(context.parser, "constant “" + constantName + "” used but never declared");
+	throw utils::ParserException(parser.coordinate(), "constant “" + constantName + "” used but never declared");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////

src/plasp/pddl/expressions/Imply.cpp

@@ -13,6 +13,7 @@ namespace expressions
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+// TODO: make static character string literal
 const std::string Imply::Identifier = "imply";
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////

src/plasp/pddl/expressions/Predicate.cpp

@@ -3,7 +3,6 @@
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Domain.h>
 #include <plasp/pddl/ExpressionContext.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/Problem.h>
 #include <plasp/pddl/expressions/Constant.h>
 #include <plasp/pddl/expressions/Variable.h>
@@ -34,13 +33,13 @@ PredicatePointer Predicate::parse(Context &context, ExpressionContext &expressio
 
 	const auto position = parser.position();
 
-	if (!parser.probe<std::string>("("))
+	if (!parser.testAndSkip<std::string>("("))
 	{
 		parser.seek(position);
 		return nullptr;
 	}
 
-	const auto predicateName = parser.parseIdentifier(isIdentifier);
+	const auto predicateName = parser.parseIdentifier();
 	const auto &predicates = expressionContext.domain.predicates();
 
 	const auto matchingPredicate = std::find_if(predicates.cbegin(), predicates.cend(),
@@ -97,13 +96,13 @@ PredicatePointer Predicate::parse(Context &context, const Problem &problem)
 
 	const auto position = parser.position();
 
-	if (!parser.probe<std::string>("("))
+	if (!parser.testAndSkip<std::string>("("))
 	{
 		parser.seek(position);
 		return nullptr;
 	}
 
-	const auto predicateName = parser.parseIdentifier(isIdentifier);
+	const auto predicateName = parser.parseIdentifier();
 	const auto &predicates = problem.domain().predicates();
 
 	const auto matchingPredicate = std::find_if(predicates.cbegin(), predicates.cend(),
@@ -122,12 +121,12 @@ PredicatePointer Predicate::parse(Context &context, const Problem &problem)
 
 	predicate->m_name = predicateName;
 
-	context.parser.skipWhiteSpace();
+	parser.skipWhiteSpace();
 
-	while (context.parser.currentCharacter() != ')')
+	while (parser.currentCharacter() != ')')
 	{
-		if (context.parser.currentCharacter() == '?')
+		if (parser.currentCharacter() == '?')
-			throw utils::ParserException(context.parser, "variables not allowed in this context");
+			throw utils::ParserException(parser.coordinate(), "variables not allowed in this context");
 
 		// Parse objects and constants
 		const auto *constant = Constant::parseAndFind(context, problem);

src/plasp/pddl/expressions/PredicateDeclaration.cpp

@@ -3,7 +3,6 @@
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Domain.h>
 #include <plasp/pddl/ExpressionContext.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/expressions/Constant.h>
 #include <plasp/pddl/expressions/Variable.h>
 
@@ -33,7 +32,7 @@ void PredicateDeclaration::parse(Context &context, Domain &domain)
 
 	auto predicate = std::make_unique<PredicateDeclaration>(PredicateDeclaration());
 
-	predicate->m_name = context.parser.parseIdentifier(isIdentifier);
+	predicate->m_name = context.parser.parseIdentifier();
 
 	// Flag predicate as correctly declared in the types section
 	predicate->setDeclared();

src/plasp/pddl/expressions/PrimitiveType.cpp

@@ -43,7 +43,7 @@ void PrimitiveType::parseDeclaration(Context &context, Domain &domain)
 
 	context.parser.skipWhiteSpace();
 
-	const auto typeName = context.parser.parseIdentifier(isIdentifier);
+	const auto typeName = context.parser.parseIdentifier();
 
 	const auto match = std::find_if(types.cbegin(), types.cend(),
 		[&](const auto &primitiveType)
@@ -76,7 +76,7 @@ void PrimitiveType::parseTypedDeclaration(Context &context, Domain &domain)
 	context.parser.skipWhiteSpace();
 
 	// Check for type inheritance
-	if (!context.parser.probe('-'))
+	if (!context.parser.testAndSkip<char>('-'))
 		return;
 
 	domain.checkRequirement(Requirement::Type::Typing);
@@ -102,14 +102,16 @@ void PrimitiveType::parseTypedDeclaration(Context &context, Domain &domain)
 
 PrimitiveType *PrimitiveType::parseAndFind(Context &context, Domain &domain)
 {
+	auto &parser = context.parser;
+
 	auto &types = domain.types();
 
-	context.parser.skipWhiteSpace();
+	parser.skipWhiteSpace();
 
-	const auto typeName = context.parser.parseIdentifier(isIdentifier);
+	const auto typeName = parser.parseIdentifier();
 
 	if (typeName.empty())
-		throw utils::ParserException(context.parser, "no type supplied");
+		throw utils::ParserException(parser.coordinate(), "no type supplied");
 
 	const auto match = std::find_if(types.cbegin(), types.cend(),
 		[&](const auto &primitiveType)
@@ -122,11 +124,11 @@ PrimitiveType *PrimitiveType::parseAndFind(Context &context, Domain &domain)
 		// Only "object" is allowed as an implicit type
 		if (typeName == "object" || typeName == "objects")
 		{
-			context.logger.logWarning(context.parser, "primitive type “" + typeName + "” should be declared");
+			context.logger.logWarning(parser.coordinate(), "primitive type “" + typeName + "” should be declared");
 			types.emplace_back(std::make_unique<expressions::PrimitiveType>(typeName));
 		}
 		else
-			throw utils::ParserException(context.parser, "type “" + typeName + "” used but never declared");
+			throw utils::ParserException(parser.coordinate(), "type “" + typeName + "” used but never declared");
 
 		return types.back().get();
 	}

src/plasp/pddl/expressions/Unsupported.cpp

@@ -1,6 +1,5 @@
 #include <plasp/pddl/expressions/Unsupported.h>
 
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/IO.h>
 
 namespace plasp
@@ -24,9 +23,9 @@ UnsupportedPointer Unsupported::parse(Context &context)
 
 	parser.expect<std::string>("(");
 
-	expression->m_type = parser.parseIdentifier(isIdentifier);
+	expression->m_type = parser.parseIdentifier();
 
-	context.logger.logWarning(context.parser, "expression type “" + expression->m_type + "” currently unsupported in this context");
+	context.logger.logWarning(parser.coordinate(), "expression type “" + expression->m_type + "” currently unsupported in this context");
 
 	skipSection(parser);
 

src/plasp/pddl/expressions/Variable.cpp

@@ -7,7 +7,6 @@
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Domain.h>
 #include <plasp/pddl/ExpressionContext.h>
-#include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/expressions/Either.h>
 #include <plasp/pddl/expressions/PrimitiveType.h>
 #include <plasp/pddl/expressions/Type.h>
@@ -36,13 +35,15 @@ Variable::Variable()
 
 void Variable::parseDeclaration(Context &context, Variables &parameters)
 {
-	context.parser.skipWhiteSpace();
+	auto &parser = context.parser;
 
-	context.parser.expect<std::string>("?");
+	parser.skipWhiteSpace();
+
+	parser.expect<std::string>("?");
 
 	auto variable = std::make_unique<Variable>(Variable());
 
-	variable->m_name = context.parser.parseIdentifier(isIdentifier);
+	variable->m_name = parser.parseIdentifier();
 
 	// Check if variable of that name already exists in the current scope
 	const auto match = std::find_if(parameters.cbegin(), parameters.cend(),
@@ -52,7 +53,7 @@ void Variable::parseDeclaration(Context &context, Variables &parameters)
 		});
 
 	if (match != parameters.cend())
-		throw utils::ParserException(context.parser, "variable “" + variable->m_name + "” already declared in this scope");
+		throw utils::ParserException(parser.coordinate(), "variable “" + variable->m_name + "” already declared in this scope");
 
 	// Flag variable for potentially upcoming type declaration
 	variable->setDirty();
@@ -75,7 +76,7 @@ void Variable::parseTypedDeclaration(Context &context, ExpressionContext &expres
 	parser.skipWhiteSpace();
 
 	// Check if the variable has a type declaration
-	if (!parser.probe('-'))
+	if (!parser.testAndSkip<char>('-'))
 		return;
 
 	const auto setType =
@@ -132,18 +133,20 @@ void Variable::parseTypedDeclarations(Context &context, ExpressionContext &expre
 		expressionContext.checkRequirement(Requirement::Type::Typing);
 	// If no types are given, check that typing is not a requirement
 	else if (expressionContext.hasRequirement(Requirement::Type::Typing))
-		throw utils::ParserException(parser, "variable has undeclared type");
+		throw utils::ParserException(parser.coordinate(), "variable has undeclared type");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 const Variable *Variable::parseAndFind(Context &context, const ExpressionContext &expressionContext)
 {
-	context.parser.skipWhiteSpace();
+	auto &parser = context.parser;
 
-	context.parser.expect<std::string>("?");
+	parser.skipWhiteSpace();
 
-	const auto variableName = context.parser.parseIdentifier(isIdentifier);
+	parser.expect<std::string>("?");
+
+	const auto variableName = parser.parseIdentifier();
 
 	const auto &variables = expressionContext.parameters;
 
@@ -154,7 +157,7 @@ const Variable *Variable::parseAndFind(Context &context, const ExpressionContext
 		});
 
 	if (match == variables.cend())
-		throw utils::ParserException(context.parser, "parameter “" + variableName + "” used but never declared");
+		throw utils::ParserException(parser.coordinate(), "parameter “" + variableName + "” used but never declared");
 
 	return match->get();
 }

src/plasp/sas/AssignedVariable.cpp

@@ -31,7 +31,7 @@ AssignedVariable::AssignedVariable(const Variable &variable, const Value &value)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-AssignedVariable AssignedVariable::fromSAS(utils::Parser &parser, const Variables &variables)
+AssignedVariable AssignedVariable::fromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	AssignedVariable assignedVariable;
 
@@ -43,7 +43,7 @@ AssignedVariable AssignedVariable::fromSAS(utils::Parser &parser, const Variable
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-AssignedVariable AssignedVariable::fromSAS(utils::Parser &parser, const Variable &variable)
+AssignedVariable AssignedVariable::fromSAS(utils::Parser<> &parser, const Variable &variable)
 {
 	AssignedVariable assignedVariable;
 

src/plasp/sas/AxiomRule.cpp

@@ -23,7 +23,7 @@ AxiomRule::AxiomRule(AxiomRule::Conditions conditions, AxiomRule::Condition post
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-AxiomRule AxiomRule::fromSAS(utils::Parser &parser, const Variables &variables)
+AxiomRule AxiomRule::fromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	parser.expect<std::string>("begin_rule");
 

src/plasp/sas/Description.cpp

@@ -28,10 +28,8 @@ Description::Description()
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Description Description::fromParser(utils::Parser &&parser)
+Description Description::fromParser(utils::Parser<> &&parser)
 {
-	parser.setCaseSensitive(true);
-
 	Description description;
 	description.parseContent(parser);
 
@@ -42,8 +40,8 @@ Description Description::fromParser(utils::Parser &&parser)
 
 Description Description::fromStream(std::istream &istream)
 {
-	utils::Parser parser;
+	utils::Parser<> parser;
-	parser.readStream("std::cin", istream);
+	parser.read("std::cin", istream);
 
 	Description description;
 	description.parseContent(parser);
@@ -58,8 +56,8 @@ Description Description::fromFile(const boost::filesystem::path &path)
 	if (!boost::filesystem::is_regular_file(path))
 		throw std::runtime_error("File does not exist: “" + path.string() + "”");
 
-	utils::Parser parser;
+	utils::Parser<> parser;
-	parser.readFile(path);
+	parser.read(path);
 
 	Description description;
 	description.parseContent(parser);
@@ -155,7 +153,14 @@ bool Description::usesConditionalEffects() const
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseContent(utils::Parser &parser)
+bool Description::hasRequirements() const
+{
+	return usesActionCosts() || usesAxiomRules() || usesConditionalEffects();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Description::parseContent(utils::Parser<> &parser)
 {
 	parseVersionSection(parser);
 	parseMetricSection(parser);
@@ -168,27 +173,27 @@ void Description::parseContent(utils::Parser &parser)
 
 	parser.skipWhiteSpace();
 
-	if (!parser.atEndOfStream())
+	if (!parser.atEnd())
-		throw utils::ParserException(parser, "expected end of SAS description (perhaps, input contains two SAS descriptions?)");
+		throw utils::ParserException(parser.coordinate(), "expected end of SAS description (perhaps, input contains two SAS descriptions?)");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseVersionSection(utils::Parser &parser) const
+void Description::parseVersionSection(utils::Parser<> &parser) const
 {
 	parser.expect<std::string>("begin_version");
 
 	const auto formatVersion = parser.parse<size_t>();
 
 	if (formatVersion != 3)
-		throw utils::ParserException(parser, "unsupported SAS format version (" + std::to_string(formatVersion) + ")");
+		throw utils::ParserException(parser.coordinate(), "unsupported SAS format version (" + std::to_string(formatVersion) + ")");
 
 	parser.expect<std::string>("end_version");
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseMetricSection(utils::Parser &parser)
+void Description::parseMetricSection(utils::Parser<> &parser)
 {
 	parser.expect<std::string>("begin_metric");
 
@@ -199,7 +204,7 @@ void Description::parseMetricSection(utils::Parser &parser)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseVariablesSection(utils::Parser &parser)
+void Description::parseVariablesSection(utils::Parser<> &parser)
 {
 	const auto numberOfVariables = parser.parse<size_t>();
 	m_variables.reserve(numberOfVariables);
@@ -210,7 +215,7 @@ void Description::parseVariablesSection(utils::Parser &parser)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseMutexSection(utils::Parser &parser)
+void Description::parseMutexSection(utils::Parser<> &parser)
 {
 	const auto numberOfMutexGroups = parser.parse<size_t>();
 	m_mutexGroups.reserve(numberOfMutexGroups);
@@ -221,21 +226,21 @@ void Description::parseMutexSection(utils::Parser &parser)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseInitialStateSection(utils::Parser &parser)
+void Description::parseInitialStateSection(utils::Parser<> &parser)
 {
 	m_initialState = std::make_unique<InitialState>(InitialState::fromSAS(parser, m_variables));
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseGoalSection(utils::Parser &parser)
+void Description::parseGoalSection(utils::Parser<> &parser)
 {
 	m_goal = std::make_unique<Goal>(Goal::fromSAS(parser, m_variables));
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseOperatorSection(utils::Parser &parser)
+void Description::parseOperatorSection(utils::Parser<> &parser)
 {
 	const auto numberOfOperators = parser.parse<size_t>();
 	m_operators.reserve(numberOfOperators);
@@ -246,7 +251,7 @@ void Description::parseOperatorSection(utils::Parser &parser)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Description::parseAxiomSection(utils::Parser &parser)
+void Description::parseAxiomSection(utils::Parser<> &parser)
 {
 	const auto numberOfAxiomRules = parser.parse<size_t>();
 	m_axiomRules.reserve(numberOfAxiomRules);

src/plasp/sas/Effect.cpp

@@ -23,7 +23,7 @@ Effect::Effect(Conditions conditions, Condition postcondition)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Effect Effect::fromSAS(utils::Parser &parser, const Variables &variables, Conditions &preconditions)
+Effect Effect::fromSAS(utils::Parser<> &parser, const Variables &variables, Conditions &preconditions)
 {
 	Effect::Conditions conditions;
 

src/plasp/sas/Goal.cpp

@@ -13,7 +13,7 @@ namespace sas
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Goal Goal::fromSAS(utils::Parser &parser, const Variables &variables)
+Goal Goal::fromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	Goal goal;
 

src/plasp/sas/InitialState.cpp

@@ -11,7 +11,7 @@ namespace sas
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-InitialState InitialState::fromSAS(utils::Parser &parser, const Variables &variables)
+InitialState InitialState::fromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	InitialState initialState;
 

src/plasp/sas/MutexGroup.cpp

@@ -15,7 +15,7 @@ namespace sas
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-MutexGroup MutexGroup::fromSAS(utils::Parser &parser, const Variables &variables)
+MutexGroup MutexGroup::fromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	MutexGroup mutexGroup;
 
@@ -29,7 +29,7 @@ MutexGroup MutexGroup::fromSAS(utils::Parser &parser, const Variables &variables
 		mutexGroup.m_facts.emplace_back(Fact::fromSAS(parser, variables));
 
 		if (mutexGroup.m_facts[j].value() == Value::None)
-			throw utils::ParserException(parser, "mutex groups must not contain <none of those> values");
+			throw utils::ParserException(parser.coordinate(), "mutex groups must not contain <none of those> values");
 	}
 
 	parser.expect<std::string>("end_mutex_group");

src/plasp/sas/Operator.cpp

@@ -17,7 +17,7 @@ namespace sas
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Operator Operator::fromSAS(utils::Parser &parser, const Variables &variables)
+Operator Operator::fromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	Operator operator_;
 

src/plasp/sas/Predicate.cpp

@@ -18,7 +18,7 @@ namespace sas
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Predicate Predicate::fromSAS(utils::Parser &parser)
+Predicate Predicate::fromSAS(utils::Parser<> &parser)
 {
 	Predicate predicate;
 
@@ -31,11 +31,12 @@ Predicate Predicate::fromSAS(utils::Parser &parser)
 		while (true)
 		{
 			// Parse arguments until reaching newline
-			parser.skipWhiteSpace(
+			// TODO: reimplement
+			/*parser.skipWhiteSpace(
 				[&](const auto character)
 				{
 					return character != '\n' && std::isspace(character);
-				});
+				});*/
 
 			if (parser.currentCharacter() == '\n')
 				break;
@@ -46,7 +47,7 @@ Predicate Predicate::fromSAS(utils::Parser &parser)
 	}
 	catch (const std::exception &e)
 	{
-		throw utils::ParserException(parser, "could not parse operator predicate");
+		throw utils::ParserException(parser.coordinate(), "could not parse operator predicate");
 	}
 
 	return predicate;

src/plasp/sas/TranslatorASP.cpp

@@ -23,13 +23,29 @@ TranslatorASP::TranslatorASP(const Description &description, utils::LogStream &o
 
 void TranslatorASP::translate() const
 {
-	translateRequirements();
+	// TODO: remove double computation of requirements
-	translateInitialState();
+	if (m_description.hasRequirements())
-	translateGoal();
+	{
+		translateRequirements();
+		m_outputStream << std::endl;
+	}
+
 	translateVariables();
+	m_outputStream << std::endl;
 	translateActions();
+	m_outputStream << std::endl;
 	translateMutexes();
-	translateAxiomRules();
+
+	if (m_description.usesAxiomRules())
+	{
+		m_outputStream << std::endl;
+		translateAxiomRules();
+	}
+
+	m_outputStream << std::endl;
+	translateInitialState();
+	m_outputStream << std::endl;
+	translateGoal();
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -39,15 +55,13 @@ void TranslatorASP::translateRequirements() const
 	m_outputStream << utils::Heading2("feature requirements") << std::endl;
 
 	if (m_description.usesActionCosts())
-		m_outputStream << utils::Keyword("requiresFeature") << "(actionCosts)." << std::endl;
+		m_outputStream << utils::Keyword("requires") << "(" << utils::Keyword("feature") << "(actionCosts))." << std::endl;
 
 	if (m_description.usesAxiomRules())
-		m_outputStream << utils::Keyword("requiresFeature") << "(axiomRules)." << std::endl;
+		m_outputStream << utils::Keyword("requires") << "(" << utils::Keyword("feature") << "(axiomRules))." << std::endl;
 
 	if (m_description.usesConditionalEffects())
-		m_outputStream << utils::Keyword("requiresFeature") << "(conditionalEffects)." << std::endl;
+		m_outputStream << utils::Keyword("requires") << "(" << utils::Keyword("feature") << "(conditionalEffects))." << std::endl;
-
-	m_outputStream << std::endl;
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -67,8 +81,6 @@ void TranslatorASP::translateInitialState() const
 			fact.value().printAsASPPredicate(m_outputStream);
 			m_outputStream << ")." << std::endl;
 		});
-
-	m_outputStream << std::endl;
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -88,8 +100,6 @@ void TranslatorASP::translateGoal() const
 			fact.value().printAsASPPredicate(m_outputStream);
 			m_outputStream << ")." << std::endl;
 		});
-
-	m_outputStream << std::endl;
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -107,9 +117,9 @@ void TranslatorASP::translateVariables() const
 
 			BOOST_ASSERT(!values.empty());
 
-			m_outputStream << std::endl;
+			m_outputStream << std::endl << utils::Keyword("variable") << "(";
 			variable.printNameAsASPPredicate(m_outputStream);
-			m_outputStream << "." << std::endl;
+			m_outputStream << ")." << std::endl;
 
 			std::for_each(values.cbegin(), values.cend(),
 				[&](const auto &value)
@@ -121,8 +131,6 @@ void TranslatorASP::translateVariables() const
 					m_outputStream << ")." << std::endl;
 				});
 		});
-
-	m_outputStream << std::endl;
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -133,12 +141,14 @@ void TranslatorASP::translateActions() const
 
 	const auto &operators = m_description.operators();
 
+	size_t currentEffectID = 0;
+
 	std::for_each(operators.cbegin(), operators.cend(),
 		[&](const auto &operator_)
 		{
-			m_outputStream << std::endl;
+			m_outputStream << std::endl << utils::Keyword("action") << "(";
 			operator_.printPredicateAsASP(m_outputStream);
-			m_outputStream << "." << std::endl;
+			m_outputStream << ")." << std::endl;
 
 			const auto &preconditions = operator_.preconditions();
 
@@ -156,8 +166,6 @@ void TranslatorASP::translateActions() const
 
 			const auto &effects = operator_.effects();
 
-			size_t currentEffectID = 0;
-
 			std::for_each(effects.cbegin(), effects.cend(),
 				[&](const auto &effect)
 				{
@@ -166,7 +174,8 @@ void TranslatorASP::translateActions() const
 					std::for_each(conditions.cbegin(), conditions.cend(),
 						[&](const auto &condition)
 						{
-							m_outputStream << utils::Keyword("effectCondition") << "(";
+							// Conditions of conditional effects
+							m_outputStream << utils::Keyword("precondition") << "(";
 							operator_.printPredicateAsASP(m_outputStream);
 							m_outputStream << ", " << utils::Keyword("effect") << "(" << utils::Number(std::to_string(currentEffectID)) << "), ";
 							condition.variable().printNameAsASPPredicate(m_outputStream);
@@ -177,21 +186,25 @@ void TranslatorASP::translateActions() const
 
 					m_outputStream << utils::Keyword("postcondition") << "(";
 					operator_.printPredicateAsASP(m_outputStream);
-					m_outputStream << ", " << utils::Keyword("effect") << "(" << utils::Number(std::to_string(currentEffectID)) << "), ";
+
+					if (conditions.empty())
+						m_outputStream << ", " << utils::Keyword("effect") << "(unconditional), ";
+					else
+					{
+						m_outputStream << ", " << utils::Keyword("effect") << "(" << utils::Number(std::to_string(currentEffectID)) << "), ";
+						currentEffectID++;
+					}
+
 					effect.postcondition().variable().printNameAsASPPredicate(m_outputStream);
 					m_outputStream << ", ";
 					effect.postcondition().value().printAsASPPredicate(m_outputStream);
 					m_outputStream << ")." << std::endl;
-
-					currentEffectID++;
 				});
 
 			m_outputStream << utils::Keyword("costs") << "(";
 			operator_.printPredicateAsASP(m_outputStream);
 			m_outputStream << ", " << operator_.costs() << ")." << std::endl;
 		});
-
-	m_outputStream << std::endl;
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -210,7 +223,12 @@ void TranslatorASP::translateMutexes() const
 			const auto mutexGroupID = std::to_string(currentMutexGroupID);
 			currentMutexGroupID++;
 
-			m_outputStream << std::endl << utils::Keyword("mutexGroup") << "(" << utils::Number(mutexGroupID) << ")." << std::endl;
+			m_outputStream
+				<< std::endl
+				<< utils::Keyword("mutexGroup") << "("
+				<< utils::Keyword("mutexGroup") << "("
+				<< utils::Number(mutexGroupID)
+				<< "))." << std::endl;
 
 			const auto &facts = mutexGroup.facts();
 
@@ -230,10 +248,6 @@ void TranslatorASP::translateMutexes() const
 
 void TranslatorASP::translateAxiomRules() const
 {
-	if (!m_description.usesActionCosts())
-		return;
-
-	m_outputStream << std::endl;
 	m_outputStream << utils::Heading2("axiom rules");
 
 	const auto &axiomRules = m_description.axiomRules();
@@ -246,14 +260,19 @@ void TranslatorASP::translateAxiomRules() const
 			const auto axiomRuleID = std::to_string(currentAxiomRuleID);
 			currentAxiomRuleID++;
 
-			m_outputStream << std::endl << utils::Keyword("axiomRule") << "(" << utils::Number(axiomRuleID) << ")." << std::endl;
+			m_outputStream
+				<< std::endl
+				<< utils::Keyword("axiomRule") << "("
+				<< utils::Keyword("axiomRule") << "("
+				<< utils::Number(axiomRuleID)
+				<< "))." << std::endl;
 
 			const auto &conditions = axiomRule.conditions();
 
 			std::for_each(conditions.cbegin(), conditions.cend(),
 				[&](const auto &condition)
 				{
-					m_outputStream << utils::Keyword("condition") << "(" << utils::Keyword("axiomRule") << "(" << utils::Number(axiomRuleID) << "), ";
+					m_outputStream << utils::Keyword("precondition") << "(" << utils::Keyword("axiomRule") << "(" << utils::Number(axiomRuleID) << "), ";
 					condition.variable().printNameAsASPPredicate(m_outputStream);
 					m_outputStream << ", ";
 					condition.value().printAsASPPredicate(m_outputStream);

src/plasp/sas/Value.cpp

@@ -55,7 +55,7 @@ Value Value::negated() const
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Value Value::fromSAS(utils::Parser &parser)
+Value Value::fromSAS(utils::Parser<> &parser)
 {
 	const auto sasSign = parser.parse<std::string>();
 
@@ -75,12 +75,12 @@ Value Value::fromSAS(utils::Parser &parser)
 	else if (sasSign == "NegatedAtom")
 		value.m_sign = Value::Sign::Negative;
 	else
-		throw utils::ParserException(parser, "invalid value sign “" + sasSign + "”");
+		throw utils::ParserException(parser.coordinate(), "invalid value sign “" + sasSign + "”");
 
 	try
 	{
 		parser.skipWhiteSpace();
-		value.m_name = parser.getLine();
+		value.m_name = parser.parseLine();
 
 		// Remove trailing ()
 		if (value.m_name.find("()") != std::string::npos)
@@ -91,7 +91,7 @@ Value Value::fromSAS(utils::Parser &parser)
 	}
 	catch (const std::exception &e)
 	{
-		throw utils::ParserException(parser, std::string("could not parse variable value (") + e.what() + ")");
+		throw utils::ParserException(parser.coordinate(), std::string("could not parse variable value (") + e.what() + ")");
 	}
 
 	return value;
@@ -99,7 +99,7 @@ Value Value::fromSAS(utils::Parser &parser)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-const Value &Value::referenceFromSAS(utils::Parser &parser, const Variable &variable)
+const Value &Value::referenceFromSAS(utils::Parser<> &parser, const Variable &variable)
 {
 	const auto valueID = parser.parse<int>();
 
@@ -107,7 +107,7 @@ const Value &Value::referenceFromSAS(utils::Parser &parser, const Variable &vari
 		return Value::Any;
 
 	if (valueID < 0 || static_cast<size_t>(valueID) >= variable.values().size())
-		throw utils::ParserException(parser, "value index out of range (variable " + variable.name() + ", index " + std::to_string(valueID) + ")");
+		throw utils::ParserException(parser.coordinate(), "value index out of range (variable " + variable.name() + ", index " + std::to_string(valueID) + ")");
 
 	return variable.values()[valueID];
 }

src/plasp/sas/Variable.cpp

@@ -24,11 +24,12 @@ Variable::Variable()
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Variable Variable::fromSAS(utils::Parser &parser)
+Variable Variable::fromSAS(utils::Parser<> &parser)
 {
 	Variable variable;
 
 	parser.expect<std::string>("begin_variable");
+	parser.expect<std::string>("var");
 
 	variable.m_name = parser.parse<std::string>();
 	variable.m_axiomLayer = parser.parse<int>();
@@ -42,7 +43,7 @@ Variable Variable::fromSAS(utils::Parser &parser)
 
 		// <none of those> values are only allowed at the end
 		if (j < numberOfValues - 1 && variable.m_values[j] == Value::None)
-			throw utils::ParserException(parser, "<none of those> value must be the last value of a variable");
+			throw utils::ParserException(parser.coordinate(), "<none of those> value must be the last value of a variable");
 	}
 
 	parser.expect<std::string>("end_variable");
@@ -54,17 +55,17 @@ Variable Variable::fromSAS(utils::Parser &parser)
 
 void Variable::printNameAsASPPredicate(utils::LogStream &outputStream) const
 {
-	outputStream << utils::Keyword("variable") << "(" << utils::escapeASP(m_name) << ")";
+	outputStream << utils::Keyword("variable") << "(" << utils::Number(utils::escapeASP(m_name)) << ")";
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-const Variable &Variable::referenceFromSAS(utils::Parser &parser, const Variables &variables)
+const Variable &Variable::referenceFromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	const auto variableID = parser.parse<size_t>();
 
 	if (variableID >= variables.size())
-		throw utils::ParserException(parser, "variable index out of range (index " + std::to_string(variableID) + ")");
+		throw utils::ParserException(parser.coordinate(), "variable index out of range (index " + std::to_string(variableID) + ")");
 
 	return variables[variableID];
 }

src/plasp/sas/VariableTransition.cpp

@@ -24,7 +24,7 @@ VariableTransition::VariableTransition()
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-VariableTransition VariableTransition::fromSAS(utils::Parser &parser, const Variables &variables)
+VariableTransition VariableTransition::fromSAS(utils::Parser<> &parser, const Variables &variables)
 {
 	VariableTransition variableTransition;
 

src/plasp/utils/Logger.cpp

@@ -105,7 +105,7 @@ void Logger::logError(const std::string &message)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Logger::logError(const Parser::Coordinate &coordinate, const std::string &message)
+void Logger::logError(const StreamCoordinate &coordinate, const std::string &message)
 {
 	m_errorStream
 		<< Format(Color::White, FontWeight::Bold) << coordinate.sectionName << ":"
@@ -119,15 +119,13 @@ void Logger::logError(const Parser::Coordinate &coordinate, const std::string &m
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-void Logger::logWarning(const Parser &parser, const std::string &message)
+void Logger::logWarning(const StreamCoordinate &coordinate, const std::string &message)
 {
 	if (m_warningLevel == WarningLevel::Ignore)
 		return;
 
 	if (m_warningLevel == WarningLevel::Error)
-		throw ParserException(parser, message);
+		throw ParserException(coordinate, message);
-
-	const auto coordinate = parser.coordinate();
 
 	m_errorStream
 		<< Format(Color::White, FontWeight::Bold) << coordinate.sectionName << ":"

src/plasp/utils/Parser.cpp

@@ -1,621 +0,0 @@
-#include <plasp/utils/Parser.h>
-
-#include <algorithm>
-#include <fstream>
-
-#include <boost/assert.hpp>
-
-#include <plasp/utils/ParserException.h>
-
-namespace plasp
-{
-namespace utils
-{
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-//
-// Parser
-//
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-const std::istreambuf_iterator<char> Parser::EndOfFile = std::istreambuf_iterator<char>();
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-Parser::Parser()
-:	m_isCaseSensitive{true}
-{
-	std::setlocale(LC_NUMERIC, "C");
-
-	// Don’t skip whitespace
-	m_stream.exceptions(std::istream::badbit);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-Parser::Parser(std::string streamName, std::istream &istream)
-:	Parser()
-{
-	readStream(streamName, istream);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-Parser::Parser(Parser &&other)
-:	m_stream{std::move(other.m_stream)},
-	m_streamDelimiters{std::move(other.m_streamDelimiters)},
-	m_isCaseSensitive{other.m_isCaseSensitive}
-{
-	other.m_isCaseSensitive = true;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-Parser &Parser::operator=(Parser &&other)
-{
-	m_stream = std::move(other.m_stream);
-	m_streamDelimiters = std::move(other.m_streamDelimiters);
-	m_isCaseSensitive = other.m_isCaseSensitive;
-
-	other.m_isCaseSensitive = true;
-
-	return *this;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::readStream(std::string streamName, std::istream &istream)
-{
-	// Store position of new section
-	const auto position = m_stream.tellp();
-
-	m_streamDelimiters.push_back({position, streamName});
-
-	m_stream << istream.rdbuf();
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::readFile(const boost::filesystem::path &path)
-{
-	if (!boost::filesystem::is_regular_file(path))
-		throw std::runtime_error("File does not exist: “" + path.string() + "”");
-
-	std::ifstream fileStream(path.string(), std::ios::in);
-
-	readStream(path.string(), fileStream);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::reset()
-{
-	m_stream.clear();
-	seek(std::ios::beg);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::seek(Position position)
-{
-	m_stream.clear();
-	m_stream.seekg(position);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-Parser::Position Parser::position() const
-{
-	return m_stream.tellg();
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-Parser::Coordinate Parser::coordinate() const
-{
-	const auto currentPosition = position();
-
-	// Find current section
-	auto currentFile = std::find_if(m_streamDelimiters.crbegin(), m_streamDelimiters.crend(),
-		[&](const auto &fileDelimiter)
-		{
-			return currentPosition >= fileDelimiter.position;
-		});
-
-	// If the parser is at the end of the stream, still count from the beginning of the last section
-	if (currentFile == m_streamDelimiters.crend())
-		currentFile = m_streamDelimiters.crbegin();
-
-	// Go back to beginning of section
-	m_stream.clear();
-	m_stream.seekg(currentFile->position);
-
-	size_t row = 1;
-	size_t column = 1;
-
-	// Compute the coordinate character by character
-	while (true)
-	{
-		if (currentPosition == -1 && atEndOfStream())
-			break;
-		else if (currentPosition >= 0 && position() >= currentPosition)
-			break;
-
-		const auto character = currentCharacter();
-
-		if (character == '\n')
-		{
-			row++;
-			column = 1;
-		}
-		else if (std::isblank(character) || std::isprint(character))
-			column++;
-
-		m_stream.ignore(1);
-	}
-
-	return {currentFile->sectionName, row, column};
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::setCaseSensitive(bool isCaseSensitive)
-{
-	m_isCaseSensitive = isCaseSensitive;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-char Parser::currentCharacter() const
-{
-	if (m_isCaseSensitive)
-		return m_stream.peek();
-
-	return std::tolower(m_stream.peek());
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-bool Parser::atEndOfStream() const
-{
-	return position() == -1;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::checkStream() const
-{
-	if (atEndOfStream())
-		throw ParserException(*this, "reading past end of file");
-
-	if (m_stream.fail())
-		throw ParserException(*this);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::advance()
-{
-	checkStream();
-	m_stream.ignore(1);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::skipWhiteSpace()
-{
-	return skipWhiteSpace(
-		[](const auto character)
-		{
-			return std::isspace(character);
-		});
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::skipLine()
-{
-	checkStream();
-
-	while (currentCharacter() != '\n')
-		advance();
-
-	advance();
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-std::string Parser::getLine()
-{
-	checkStream();
-
-	std::string value;
-
-	while (true)
-	{
-		const auto character = currentCharacter();
-
-		advance();
-
-		if (character == '\n')
-			break;
-		else if (character == '\r')
-			continue;
-
-		value.push_back(character);
-	}
-
-	return value;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-std::string Parser::parse<std::string>()
-{
-	skipWhiteSpace();
-
-	std::string value;
-
-	while (true)
-	{
-		const auto character = currentCharacter();
-
-		if (std::isspace(character))
-			break;
-
-		value.push_back(character);
-		advance();
-	}
-
-	return value;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-bool Parser::probe<std::string>(const std::string &expectedValue)
-{
-	const auto previousPosition = position();
-
-	if (!std::iswspace(expectedValue.front()))
-		skipWhiteSpace();
-
-	const auto match = std::find_if(expectedValue.cbegin(), expectedValue.cend(),
-		[&](const auto &expectedCharacter)
-		{
-			const auto character = static_cast<char>(this->currentCharacter());
-
-			if (character != expectedCharacter)
-				return true;
-
-			this->advance();
-
-			return false;
-		});
-
-	const auto differs = (match != expectedValue.cend());
-
-	if (!differs)
-		return true;
-
-	seek(previousPosition);
-
-	return false;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-void Parser::expect<std::string>(const std::string &expectedValue)
-{
-	if (!probe<std::string>(expectedValue))
-		throw ParserException(*this, "expected “" + expectedValue + "”");
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-char Parser::parse<char>()
-{
-	const auto value = currentCharacter();
-
-	advance();
-
-	return value;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-bool Parser::probe<char>(const char &expectedValue)
-{
-	if (currentCharacter() != expectedValue)
-		return false;
-
-	advance();
-
-	return true;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-void Parser::expect<char>(const char &expectedValue)
-{
-	if (!probe<char>(expectedValue))
-		throw ParserException(*this, std::string("expected “") + expectedValue + "”");
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-uint64_t Parser::parseIntegerBody()
-{
-	checkStream();
-
-	if (!std::isdigit(currentCharacter()))
-		throw ParserException(*this, "could not parse integer value");
-
-	uint64_t value = 0;
-
-	while (!atEndOfStream())
-	{
-		const auto character = currentCharacter();
-
-		if (!std::isdigit(character))
-			break;
-
-		value *= 10;
-		value += character - '0';
-
-		advance();
-	}
-
-	return value;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-int64_t Parser::parse<int64_t>()
-{
-	skipWhiteSpace();
-
-	bool positive = probe('+') || !probe('-');
-
-	const auto value = parseIntegerBody();
-
-	return (positive ? value : -value);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-uint64_t Parser::parse<uint64_t>()
-{
-	skipWhiteSpace();
-
-	if (currentCharacter() == '-')
-		throw ParserException(*this, "expected unsigned integer, got signed one");
-
-	return parseIntegerBody();
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-bool Parser::probe<int64_t>(const int64_t &expectedValue)
-{
-	const auto previousPosition = position();
-	const auto value = parse<int64_t>();
-
-	if (value == expectedValue)
-		return true;
-
-	seek(previousPosition);
-
-	return false;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-bool Parser::probe<uint64_t>(const uint64_t &expectedValue)
-{
-	const auto previousPosition = position();
-	const auto value = parse<uint64_t>();
-
-	if (value == expectedValue)
-		return true;
-
-	seek(previousPosition);
-
-	return false;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-void Parser::expect<int64_t>(const int64_t &expectedValue)
-{
-	if (!probe<int64_t>(expectedValue))
-		throw ParserException(*this, "expected “" + std::to_string(expectedValue) + "”");
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-void Parser::expect<uint64_t>(const uint64_t &expectedValue)
-{
-	if (!probe<uint64_t>(expectedValue))
-		throw ParserException(*this, "expected “" + std::to_string(expectedValue) + "”");
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-int32_t Parser::parse<int32_t>()
-{
-	return static_cast<int32_t>(parse<int64_t>());
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-uint32_t Parser::parse<uint32_t>()
-{
-	return static_cast<uint32_t>(parse<uint64_t>());
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-bool Parser::probe<int32_t>(const int32_t &expectedValue)
-{
-	return probe<int64_t>(static_cast<int64_t>(expectedValue));
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-bool Parser::probe<uint32_t>(const uint32_t &expectedValue)
-{
-	return probe<uint64_t>(static_cast<uint64_t>(expectedValue));
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-void Parser::expect<int32_t>(const int32_t &expectedValue)
-{
-	expect<int64_t>(static_cast<int64_t>(expectedValue));
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-void Parser::expect<uint32_t>(const uint32_t &expectedValue)
-{
-	expect<uint64_t>(static_cast<uint64_t>(expectedValue));
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-bool Parser::parse<bool>()
-{
-	skipWhiteSpace();
-
-	if (probe('0'))
-	    return false;
-
-	if (probe('1'))
-		return true;
-
-	throw ParserException(*this, "could not parse Boolean value");
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-template<>
-void Parser::expect<bool>(const bool &expectedValue)
-{
-	const auto value = parse<bool>();
-
-	if (value != expectedValue)
-		throw ParserException(*this, "expected “" + std::to_string(expectedValue) + "”");
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-bool Parser::probeNumber()
-{
-	const auto previousPosition = position();
-
-	skipWhiteSpace();
-
-	while (!std::iswspace(currentCharacter()))
-		if (!std::isdigit(currentCharacter()))
-		{
-			seek(previousPosition);
-
-			return false;
-		}
-
-	return true;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-void Parser::removeComments(const std::string &startSequence, const std::string &endSequence, bool removeEnd)
-{
-	const auto inPosition = m_stream.tellg();
-	const auto outPosition = m_stream.tellp();
-
-	m_stream.seekg(0);
-
-	const auto removeRange =
-		[&](const auto &start, const auto &end)
-		{
-			BOOST_ASSERT(start != -1);
-
-			m_stream.clear();
-			m_stream.seekp(start);
-			m_stream.seekg(start);
-
-			auto position = start;
-
-			while (end == -1 || position < end)
-			{
-				m_stream.ignore(1);
-
-				if (atEndOfStream())
-					return;
-
-				m_stream.put(' ');
-				position += static_cast<std::streamoff>(1);
-			}
-		};
-
-	while (!atEndOfStream())
-	{
-		Position startPosition = m_stream.tellg();
-
-		while (!atEndOfStream())
-		{
-			startPosition = m_stream.tellg();
-
-			if (probe(startSequence))
-				break;
-
-			advance();
-		}
-
-		Position endPosition = m_stream.tellg();
-
-		while (!atEndOfStream())
-		{
-			endPosition = m_stream.tellg();
-
-			if (probe(endSequence))
-				break;
-
-			advance();
-		}
-
-		if (removeEnd)
-			endPosition = m_stream.tellg();
-
-		removeRange(startPosition, endPosition);
-	}
-
-	m_stream.clear();
-
-	m_stream.seekg(inPosition);
-	m_stream.seekp(outPosition);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-}
-}

src/plasp/utils/Stream.cpp

@@ -0,0 +1,162 @@
+#include <plasp/utils/Stream.h>
+
+#include <fstream>
+
+namespace plasp
+{
+namespace utils
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Stream
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+Stream::Stream()
+{
+	std::setlocale(LC_NUMERIC, "C");
+
+	// Don’t skip whitespace
+	m_stream.exceptions(std::istream::badbit);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+Stream::Stream(std::string streamName, std::istream &istream)
+{
+	read(streamName, istream);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Stream::read(std::string streamName, std::istream &istream)
+{
+	// Store position of new section
+	const auto position = m_stream.tellp();
+
+	m_delimiters.push_back({position, streamName});
+
+	m_stream << istream.rdbuf();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Stream::read(const boost::filesystem::path &path)
+{
+	if (!boost::filesystem::is_regular_file(path))
+		throw std::runtime_error("File does not exist: “" + path.string() + "”");
+
+	std::ifstream fileStream(path.string(), std::ios::in);
+
+	read(path.string(), fileStream);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Stream::reset()
+{
+	m_stream.clear();
+	seek(0);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Stream::seek(Position position)
+{
+	m_stream.clear();
+	m_stream.seekg(position);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typename Stream::Position Stream::position() const
+{
+	return m_stream.tellg();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+StreamCoordinate Stream::coordinate() const
+{
+	const auto currentPosition = position();
+
+	// Find current section
+	auto currentFile = std::find_if(m_delimiters.crbegin(), m_delimiters.crend(),
+		[&](const auto &fileDelimiter)
+		{
+			return currentPosition >= fileDelimiter.position;
+		});
+
+	// If the parser is at the end of the stream, still count from the beginning of the last section
+	if (currentFile == m_delimiters.crend())
+		currentFile = m_delimiters.crbegin();
+
+	// Go back to beginning of section
+	m_stream.clear();
+	m_stream.seekg(currentFile->position);
+
+	size_t row = 1;
+	size_t column = 1;
+
+	// Compute the coordinate character by character
+	while (true)
+	{
+		if (currentPosition == -1 && atEnd())
+			break;
+		else if (currentPosition >= 0 && position() >= currentPosition)
+			break;
+
+		const auto character = currentCharacter();
+
+		if (character == '\n')
+		{
+			row++;
+			column = 1;
+		}
+		else if (std::isblank(character) || std::isprint(character))
+			column++;
+
+		m_stream.ignore(1);
+	}
+
+	return {currentFile->sectionName, row, column};
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+char Stream::currentCharacter() const
+{
+	return m_stream.peek();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+bool Stream::atEnd() const
+{
+	return position() == -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Stream::check() const
+{
+	if (atEnd())
+		throw ParserException(coordinate(), "reading past end of file");
+
+	if (m_stream.fail())
+		throw ParserException(coordinate());
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Stream::advance()
+{
+	check();
+	m_stream.ignore(1);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}

tests/TestUtils.cpp

@@ -6,10 +6,10 @@
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-TEST(UtilsTests, ParseSimple)
+TEST(UtilsTests, ParserParse)
 {
-	std::stringstream s("identifier  5   \n-51\t 0 1 expected unexpected");
+	std::stringstream s("  identifier  5   \n-51\t 0 1 100 200 -300 -400");
-	plasp::utils::Parser p("input", s);
+	plasp::utils::Parser<> p("input", s);
 
 	ASSERT_EQ(p.parse<std::string>(), "identifier");
 	ASSERT_EQ(p.parse<size_t>(), 5u);
@@ -17,20 +17,6 @@ TEST(UtilsTests, ParseSimple)
 	ASSERT_EQ(p.parse<bool>(), false);
 	ASSERT_EQ(p.parse<bool>(), true);
 
-	ASSERT_NO_THROW(p.expect<std::string>("expected"));
-	ASSERT_THROW(p.expect<std::string>("expected"), plasp::utils::ParserException);
-
-	// TODO: test case-insensitive input
-	// TODO: test probing
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-TEST(UtilsTests, ParseUnsignedNumbers)
-{
-	std::stringstream s("100 200 -300 -400");
-	plasp::utils::Parser p("input", s);
-
 	ASSERT_EQ(p.parse<int>(), 100);
 	ASSERT_EQ(p.parse<size_t>(), 200u);
 	ASSERT_EQ(p.parse<int>(), -300);
@@ -39,16 +25,119 @@ TEST(UtilsTests, ParseUnsignedNumbers)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+TEST(UtilsTests, ParserExpect)
+{
+	std::stringstream s("  identifier  5   \n-51\t 0 1 100 200 -300 -400");
+	plasp::utils::Parser<> p("input", s);
+
+	ASSERT_NO_THROW(p.expect<std::string>("identifier"));
+	ASSERT_NO_THROW(p.expect<size_t>(5u));
+	ASSERT_NO_THROW(p.expect<int>(-51));
+	ASSERT_NO_THROW(p.expect<bool>(false));
+	ASSERT_NO_THROW(p.expect<bool>(true));
+
+	ASSERT_NO_THROW(p.expect<int>(100));
+	ASSERT_NO_THROW(p.expect<size_t>(200u));
+	ASSERT_NO_THROW(p.expect<int>(-300));
+	ASSERT_THROW(p.expect<size_t>(-400), plasp::utils::ParserException);
+
+	p.seek(0);
+	ASSERT_THROW(p.expect<std::string>("error"), plasp::utils::ParserException);
+
+	p.seek(14);
+	ASSERT_THROW(p.expect<size_t>(6u), plasp::utils::ParserException);
+
+	p.seek(17);
+	ASSERT_THROW(p.expect<int>(-50), plasp::utils::ParserException);
+
+	p.seek(24);
+	ASSERT_THROW(p.expect<bool>(true), plasp::utils::ParserException);
+
+	p.seek(26);
+	ASSERT_THROW(p.expect<bool>(false), plasp::utils::ParserException);
+
+	p.seek(28);
+	ASSERT_THROW(p.expect<int>(101), plasp::utils::ParserException);
+
+	p.seek(31);
+	ASSERT_THROW(p.expect<size_t>(201), plasp::utils::ParserException);
+
+	p.seek(34);
+	ASSERT_THROW(p.expect<int>(-299), plasp::utils::ParserException);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+TEST(UtilsTests, ParserTest)
+{
+	std::stringstream s("  identifier  5   \n-51\t 0 1");
+	plasp::utils::Parser<> p("input", s);
+
+	plasp::utils::Parser<>::Position pos;
+
+	pos = p.position();
+	ASSERT_EQ(p.testAndReturn<std::string>("error"), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndReturn<std::string>("identifier"), true);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<std::string>("error"), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<std::string>("identifier"), true);
+	ASSERT_EQ(p.position(), 12);
+
+	pos = p.position();
+	ASSERT_EQ(p.testAndReturn<size_t>(6u), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndReturn<size_t>(5u), true);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<size_t>(6u), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<size_t>(5u), true);
+	ASSERT_EQ(p.position(), 15);
+
+	pos = p.position();
+	ASSERT_EQ(p.testAndReturn<int>(-50), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndReturn<int>(-51), true);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<int>(-50), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<int>(-51), true);
+	ASSERT_EQ(p.position(), 22);
+
+	pos = p.position();
+	ASSERT_EQ(p.testAndReturn<bool>(true), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndReturn<bool>(false), true);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<bool>(true), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<bool>(false), true);
+	ASSERT_EQ(p.position(), 25);
+
+	pos = p.position();
+	ASSERT_EQ(p.testAndReturn<bool>(false), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndReturn<bool>(true), true);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<bool>(false), false);
+	ASSERT_EQ(p.position(), pos);
+	ASSERT_EQ(p.testAndSkip<bool>(true), true);
+	ASSERT_EQ(p.position(), 27);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
 TEST(UtilsTests, ParseEndOfFile)
 {
 	std::stringstream s1("test");
-	plasp::utils::Parser p1("input", s1);
+	plasp::utils::Parser<> p1("input", s1);
 
 	ASSERT_NO_THROW(p1.expect<std::string>("test"));
 	ASSERT_THROW(p1.parse<std::string>(), plasp::utils::ParserException);
 
 	std::stringstream s2("test1 test2 test3");
-	plasp::utils::Parser p2("input", s2);
+	plasp::utils::Parser<> p2("input", s2);
 
 	ASSERT_NO_THROW(p2.expect<std::string>("test1"));
 	ASSERT_NO_THROW(p2.expect<std::string>("test2"));
@@ -56,13 +145,13 @@ TEST(UtilsTests, ParseEndOfFile)
 	ASSERT_THROW(p2.parse<std::string>(), plasp::utils::ParserException);
 
 	std::stringstream s3("-127");
-	plasp::utils::Parser p3("input", s3);
+	plasp::utils::Parser<> p3("input", s3);
 
 	p3.expect<int>(-127);
 	ASSERT_THROW(p3.parse<int>(), plasp::utils::ParserException);
 
 	std::stringstream s4("128 -1023 -4095");
-	plasp::utils::Parser p4("input", s4);
+	plasp::utils::Parser<> p4("input", s4);
 
 	ASSERT_NO_THROW(p4.expect<size_t>(128));
 	ASSERT_NO_THROW(p4.expect<int>(-1023));
@@ -70,13 +159,13 @@ TEST(UtilsTests, ParseEndOfFile)
 	ASSERT_THROW(p4.parse<int>(), plasp::utils::ParserException);
 
 	std::stringstream s5("0");
-	plasp::utils::Parser p5("input", s5);
+	plasp::utils::Parser<> p5("input", s5);
 
 	p5.expect<bool>(false);
 	ASSERT_THROW(p5.parse<bool>(), plasp::utils::ParserException);
 
 	std::stringstream s6("0 1 0");
-	plasp::utils::Parser p6("input", s6);
+	plasp::utils::Parser<> p6("input", s6);
 
 	ASSERT_NO_THROW(p6.expect<bool>(false));
 	ASSERT_NO_THROW(p6.expect<bool>(true));
@@ -89,9 +178,11 @@ TEST(UtilsTests, ParseEndOfFile)
 TEST(UtilsTests, ParserPosition)
 {
 	std::stringstream s("123 \n4\ntest1\n test2\ntest3 \ntest4\n\n\n\n");
-	plasp::utils::Parser p("input", s);
+	plasp::utils::Parser<> p("input", s);
 
-	plasp::utils::Parser::Coordinate c;
+	const auto startPosition = p.position();
+
+	plasp::utils::StreamCoordinate c;
 
 	c = p.coordinate();
 	ASSERT_EQ(c.row, 1u);
@@ -170,7 +261,22 @@ TEST(UtilsTests, ParserPosition)
 	c = p.coordinate();
 	ASSERT_EQ(c.row, 10u);
 	ASSERT_EQ(c.column, 1u);
-	ASSERT_TRUE(p.atEndOfStream());
+	ASSERT_TRUE(p.atEnd());
+
+	p.reset();
+	ASSERT_EQ(p.position(), startPosition);
+	ASSERT_FALSE(p.atEnd());
+
+	for (size_t i = 0; i < 5; i++)
+		p.advance();
+
+	ASSERT_EQ(p.position(), static_cast<std::istream::pos_type>(5));
+
+	p.seek(static_cast<std::istream::pos_type>(7));
+
+	ASSERT_EQ(p.position(), static_cast<std::istream::pos_type>(7));
+
+	ASSERT_NO_THROW(p.expect<std::string>("test1"));
 
 	// TODO: test parser with multiple sections
 }
@@ -180,11 +286,11 @@ TEST(UtilsTests, ParserPosition)
 TEST(UtilsTests, ParserRemoveComments)
 {
 	std::stringstream s1("; comment at beginning\ntest1; comment in between\ntest2; comment at end");
-	plasp::utils::Parser p1("input", s1);
+	plasp::utils::Parser<> p1("input", s1);
 
 	p1.removeComments(";", "\n", false);
 
-	plasp::utils::Parser::Coordinate c;
+	plasp::utils::StreamCoordinate c;
 
 	ASSERT_NO_THROW(p1.expect<std::string>("test1"));
 
@@ -200,10 +306,10 @@ TEST(UtilsTests, ParserRemoveComments)
 
 	p1.skipWhiteSpace();
 
-	ASSERT_TRUE(p1.atEndOfStream());
+	ASSERT_TRUE(p1.atEnd());
 
 	std::stringstream s2("test;");
-	plasp::utils::Parser p2("input", s2);
+	plasp::utils::Parser<> p2("input", s2);
 
 	p2.removeComments(";", "\n", false);
 
@@ -211,10 +317,10 @@ TEST(UtilsTests, ParserRemoveComments)
 
 	p2.skipWhiteSpace();
 
-	ASSERT_TRUE(p2.atEndOfStream());
+	ASSERT_TRUE(p2.atEnd());
 
 	std::stringstream s3("/* comment at start */ test1 /* comment in between */ test2 /*");
-	plasp::utils::Parser p3("input", s3);
+	plasp::utils::Parser<> p3("input", s3);
 
 	p3.removeComments("/*", "*/", true);
 
@@ -223,7 +329,7 @@ TEST(UtilsTests, ParserRemoveComments)
 
 	p3.skipWhiteSpace();
 
-	ASSERT_TRUE(p3.atEndOfStream());
+	ASSERT_TRUE(p3.atEnd());
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////