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• Syntactic_predicate abstract "A syntactic predicate specifies the syntactic validity of applying a production in a formal grammar and is analogous to a semantic predicate that specifies the semantic validity of applying a production. It is a simple and effective means of dramatically improving the recognition strength of an LL parser by providing arbitrary lookahead. In their original implementation, syntactic predicates had the form “( α )?” and could only appear on the left edge of a production. The required syntactic condition α could be any valid context-free grammar fragment.More formally, a syntactic predicate is a form of production intersection, used in parser specifications or in formal grammars. In this sense, the term predicate has the meaning of a mathematical indicator function. If p1 and p2, are production rules, the language generated by both p1 and p2 is their set intersection.As typically defined or implemented, syntactic predicates implicitly order the productions so that predicated productions specified earlier have higher precedence than predicated productions specified later within the same decision. This conveys an ability to disambiguate ambiguous productions because the programmer can simply specify which production should match.Parsing expression grammars (PEGs), invented by Bryan Ford, extend these simple predicates by allowing \"not predicates\" and permitting a predicate to appear anywhere within a production. Morever, Ford invented packrat parsing to handle these grammars in linear time by employing memoization, at the cost of heap space.It is possible to support linear-time parsing of predicates as general as those allowed by PEGs, but reduce the memory cost associated with memoization by avoiding backtracking where some more efficient implementation of lookahead suffices. This approach is implemented by ANTLR version 3, which uses Deterministic finite automata for lookahead; this may require testing a predicate in order to choose between transitions of the DFA (called \"pred-LL(*)\" parsing).".
• Syntactic_predicate wikiPageExternalLink packrat.
• Syntactic_predicate wikiPageExternalLink boolean.
• Syntactic_predicate wikiPageExternalLink conjunctive.
• Syntactic_predicate wikiPageExternalLink www.antlr.org.
• Syntactic_predicate wikiPageID "7400895".
• Syntactic_predicate wikiPageLength "14113".
• Syntactic_predicate wikiPageOutDegree "46".
• Syntactic_predicate wikiPageRevisionID "666634482".
• Syntactic_predicate wikiPageWikiLink ANTLR.
• Syntactic_predicate wikiPageWikiLink Adaptive_grammar.
• Syntactic_predicate wikiPageWikiLink Boolean_grammar.
• Syntactic_predicate wikiPageWikiLink C++.
• Syntactic_predicate wikiPageWikiLink Category:Formal_languages.
• Syntactic_predicate wikiPageWikiLink Category:Parsing.
• Syntactic_predicate wikiPageWikiLink Chomsky_hierarchy.
• Syntactic_predicate wikiPageWikiLink Closure_(mathematics).
• Syntactic_predicate wikiPageWikiLink Commutative_property.
• Syntactic_predicate wikiPageWikiLink Conjunctive_grammar.
• Syntactic_predicate wikiPageWikiLink Context-free_language.
• Syntactic_predicate wikiPageWikiLink Deterministic_finite_automaton.
• Syntactic_predicate wikiPageWikiLink Empty_string.
• Syntactic_predicate wikiPageWikiLink Formal_grammar.
• Syntactic_predicate wikiPageWikiLink Formal_language.
• Syntactic_predicate wikiPageWikiLink Formal_system.
• Syntactic_predicate wikiPageWikiLink If_and_only_if.
• Syntactic_predicate wikiPageWikiLink Indicator_function.
• Syntactic_predicate wikiPageWikiLink Intersection_(set_theory).
• Syntactic_predicate wikiPageWikiLink LL_parser.
• Syntactic_predicate wikiPageWikiLink Logical_conjunction.
• Syntactic_predicate wikiPageWikiLink Memoization.
• Syntactic_predicate wikiPageWikiLink Parsing.
• Syntactic_predicate wikiPageWikiLink Parsing_expression_grammar.
• Syntactic_predicate wikiPageWikiLink Perl.
• Syntactic_predicate wikiPageWikiLink Perl_6.
• Syntactic_predicate wikiPageWikiLink Perl_6_rules.
• Syntactic_predicate wikiPageWikiLink Predicate_(grammar).
• Syntactic_predicate wikiPageWikiLink Regular_language.
• Syntactic_predicate wikiPageWikiLink Semantic_predicate.
• Syntactic_predicate wikiPageWikiLink Semantics.
• Syntactic_predicate wikiPageWikiLink Side_effect_(computer_science).
• Syntactic_predicate wikiPageWikiLink String_(computer_science).
• Syntactic_predicate wikiPageWikiLink Yehoshua_Bar-Hillel.
• Syntactic_predicate wikiPageWikiLinkText "Syntactic predicate".
• Syntactic_predicate wikiPageWikiLinkText "predicate".
• Syntactic_predicate wikiPageWikiLinkText "syntactic predicate".
• Syntactic_predicate wikiPageWikiLinkText "syntactic".
• Syntactic_predicate wikiPageUsesTemplate Template:Reflist.
• Syntactic_predicate wikiPageUsesTemplate Template:Use_dmy_dates.
• Syntactic_predicate subject Category:Formal_languages.
• Syntactic_predicate subject Category:Parsing.
• Syntactic_predicate type Language.
• Syntactic_predicate type Combinatoric.
• Syntactic_predicate type Language.
• Syntactic_predicate comment "A syntactic predicate specifies the syntactic validity of applying a production in a formal grammar and is analogous to a semantic predicate that specifies the semantic validity of applying a production. It is a simple and effective means of dramatically improving the recognition strength of an LL parser by providing arbitrary lookahead. In their original implementation, syntactic predicates had the form “( α )?” and could only appear on the left edge of a production.".
• Syntactic_predicate label "Syntactic predicate".
• Syntactic_predicate sameAs Q7662657.
• Syntactic_predicate sameAs m.0d2xbn.
• Syntactic_predicate sameAs Q7662657.
• Syntactic_predicate wasDerivedFrom Syntactic_predicate?oldid=666634482.
• Syntactic_predicate isPrimaryTopicOf Syntactic_predicate.