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"""
pygments.lexers.pddl
~~~~~~~~~~~~~~~~~~~~
Lexer for the Planning Domain Definition Language.
:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from pygments.lexer import RegexLexer, words, include
from pygments.token import Punctuation, Keyword, Whitespace, Name, Comment, \
Operator, Number
__all__ = ['PddlLexer']
class PddlLexer(RegexLexer):
"""
A PDDL lexer.
It should support up to PDDL 3.1.
"""
name = 'PDDL'
aliases = ['pddl']
filenames = ['*.pddl']
# there doesn't really seem to be a PDDL homepage.
url = 'https://en.wikipedia.org/wiki/Planning_Domain_Definition_Language'
version_added = '2.19'
tokens = {
'root': [
(r'\s+', Whitespace),
(r';.*$', Comment.Singleline),
include('keywords'),
include('builtins'),
(r'[()]', Punctuation),
(r'[=/*+><-]', Operator),
(r'[a-zA-Z][a-zA-Z0-9_-]*', Name),
(r'\?[a-zA-Z][a-zA-Z0-9_-]*', Name.Variable),
(r'[0-9]+\.[0-9]+', Number.Float),
(r'[0-9]+', Number.Integer),
],
'keywords': [
(words((
':requirements', ':types', ':constants',
':predicates', ':functions', ':action', ':agent',
':parameters', ':precondition', ':effect',
':durative-action', ':duration', ':condition',
':derived', ':domain', ':objects', ':init',
':goal', ':metric', ':length', ':serial', ':parallel',
# the following are requirements
':strips', ':typing', ':negative-preconditions',
':disjunctive-preconditions', ':equality',
':existential-preconditions', ':universal-preconditions',
':conditional-effects', ':fluents', ':numeric-fluents',
':object-fluents', ':adl', ':durative-actions',
':continuous-effects', ':derived-predicates',
':time-intial-literals', ':preferences',
':constraints', ':action-costs', ':multi-agent',
':unfactored-privacy', ':factored-privacy',
':non-deterministic'
), suffix=r'\b'), Keyword)
],
'builtins': [
(words((
'define', 'domain', 'object', 'either', 'and',
'forall', 'preference', 'imply', 'or', 'exists',
'not', 'when', 'assign', 'scale-up', 'scale-down',
'increase', 'decrease', 'at', 'over', 'start',
'end', 'all', 'problem', 'always', 'sometime',
'within', 'at-most-once', 'sometime-after',
'sometime-before', 'always-within', 'hold-during',
'hold-after', 'minimize', 'maximize',
'total-time', 'is-violated'), suffix=r'\b'),
Name.Builtin)
]
}