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anthem/CHANGELOG.md
Patrick Lühne c294a29cb2
Support placeholders with #external declarations 
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.
2018-04-08 20:28:57 +02:00

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Change Log

(unreleased)

Features

  • support for declaring placeholders with the #external directive

Internal

  • drops Boost dependency in favor of the header-only command-line option library cxxopts

0.1.6 (2017-06-12)

Features

  • unique IDs for all variables (user-defined variables are renamed)
  • support for hiding predicates from completed output by using #show statements
  • more simplification rules with --simplify
  • command-line option --parentheses to fully parenthesize the output
  • adds multiple example instances for experimenting

Bug Fixes

  • adds missing error message when attempting to read inaccessible file
  • removes unnecessary parentheses after simplification
  • fixes incorrect simplification with binary operations in arguments

0.1.5 (2017-05-04)

Bug Fixes

  • fixes lost signs with negated 0-ary predicates

0.1.4 (2017-04-12)

Features

  • completion of input programs (optional)
  • command-line option --complete to turn on completion

0.1.3 (2017-03-30)

Features

  • support for anonymous variables

Bug Fixes

  • fixes incorrectly simplified rules with comparisons
  • fixes misleading error message concerning negated, unsupported body literals

0.1.2 (2017-03-23)

Features

  • simplification of output formulas (optional)
  • command-line option --simplify to turn on simplification

Bug Fixes

  • fixes incorrectly translated choice rules with multiple elements in the head aggregate

Internal

  • explicit syntax tree representation for first-order formulas

0.1.1 (2017-03-06)

Features

  • support for choice rules (without guards)

0.1.0 (2016-11-24)

Features

  • initial support for translating rules in Essential Gringo (excluding aggregates) to first-order logic formulas
  • command-line option --color to autodetect, enable, or disable color output
  • command-line option --log-level to control which status messages should be shown