Patrick Lühne
c294a29cb2
This adds support for declaring predicates as placeholders through the
“#external” directive in the input language of clingo.
Placeholders are not subject to completion. This prevents predicates
that represent instance-specific facts from being assumed as universally
false by default negation when translating an encoding.
This stretches clingo’s usual syntax a bit to make the implementation
lightweight. In order to declare a predicate with a specific arity as a
placeholder, the following statement needs to be added to the program:
#external <predicate name>(<arity>).
Multiple unit tests cover cases where placeholders are used or not as
well as a more complex graph coloring example.
81 lines
2.0 KiB
Markdown
81 lines
2.0 KiB
Markdown
# Change Log
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## (unreleased)
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### Features
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* support for declaring placeholders with the `#external` directive
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### Internal
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* drops Boost dependency in favor of the header-only command-line option library [cxxopts](https://github.com/jarro2783/cxxopts)
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## 0.1.6 (2017-06-12)
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### Features
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* unique IDs for all variables (user-defined variables are renamed)
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* support for hiding predicates from completed output by using `#show` statements
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* more simplification rules with `--simplify`
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* command-line option `--parentheses` to fully parenthesize the output
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* adds multiple example instances for experimenting
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### Bug Fixes
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* adds missing error message when attempting to read inaccessible file
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* removes unnecessary parentheses after simplification
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* fixes incorrect simplification with binary operations in arguments
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## 0.1.5 (2017-05-04)
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### Bug Fixes
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* fixes lost signs with negated 0-ary predicates
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## 0.1.4 (2017-04-12)
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### Features
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* completion of input programs (optional)
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* command-line option `--complete` to turn on completion
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## 0.1.3 (2017-03-30)
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### Features
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* support for anonymous variables
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### Bug Fixes
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* fixes incorrectly simplified rules with comparisons
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* fixes misleading error message concerning negated, unsupported body literals
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## 0.1.2 (2017-03-23)
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### Features
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* simplification of output formulas (optional)
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* command-line option `--simplify` to turn on simplification
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### Bug Fixes
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* fixes incorrectly translated choice rules with multiple elements in the head aggregate
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### Internal
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* explicit syntax tree representation for first-order formulas
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## 0.1.1 (2017-03-06)
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### Features
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* support for choice rules (without guards)
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## 0.1.0 (2016-11-24)
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### Features
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* initial support for translating rules in *Essential Gringo* (excluding aggregates) to first-order logic formulas
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* command-line option `--color` to autodetect, enable, or disable color output
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* command-line option `--log-level` to control which status messages should be shown
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