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- SLR_grammar abstract "In computer science, SLR grammars are the class of formal grammars accepted by a Simple LR parser. SLR grammars are a superset of all LR(0) grammars and a subset of all LALR(1) and LR(1) grammars.When processed by an SLR parser, an SLR grammar is converted into parse tables with no shift/reduce or reduce/reduce conflicts for any combination of LR(0) parser state and expected lookahead symbol. If the grammar is not SLR, the parse tables will have shift/reduce conflicts or reduce/reduce conflicts for some state and some lookahead symbols, and the resulting rejected parser is no longer deterministic. The parser cannot decide whether to shift or reduce next, or cannot decide between two candidate reductions. SLR parsers use a Follow(A) calculation to pick the lookahead symbols to expect for every completed nonterminal. LALR parsers use a different calculation which sometimes gives smaller, tighter lookahead sets for the same parser states. Those smaller sets can eliminate overlap with the state's shift actions, and overlap with lookaheads for other reductions in this same state. The overlap conflicts reported by SLR parsers are then spurious, a result of the approximate calculation using Follow(A).A grammar which is ambiguous will have unavoidable shift/reduce conflicts or reduce/reduce conflicts for every LR analysis method, including SLR. A common way for computer language grammars to be ambiguous is if some nonterminal is both left- and right-recursive:Expr → Expr * ValExpr → Val + ExprExpr → Val".
- SLR_grammar wikiPageID "21820106".
- SLR_grammar wikiPageLength "4142".
- SLR_grammar wikiPageOutDegree "7".
- SLR_grammar wikiPageRevisionID "666692589".
- SLR_grammar wikiPageWikiLink Category:Formal_languages.
- SLR_grammar wikiPageWikiLink Computer_science.
- SLR_grammar wikiPageWikiLink Formal_grammar.
- SLR_grammar wikiPageWikiLink LALR_parser.
- SLR_grammar wikiPageWikiLink LL_grammar.
- SLR_grammar wikiPageWikiLink Simple_LR_parser.
- SLR_grammar wikiPageWikiLinkText "SLR grammar".
- SLR_grammar wikiPageWikiLinkText "Simple LR".
- SLR_grammar hasPhotoCollection SLR_grammar.
- SLR_grammar wikiPageUsesTemplate Template:Confusing.
- SLR_grammar subject Category:Formal_languages.
- SLR_grammar hypernym Grammars.
- SLR_grammar type Article.
- SLR_grammar type Language.
- SLR_grammar type Article.
- SLR_grammar type Combinatoric.
- SLR_grammar type Language.
- SLR_grammar comment "In computer science, SLR grammars are the class of formal grammars accepted by a Simple LR parser. SLR grammars are a superset of all LR(0) grammars and a subset of all LALR(1) and LR(1) grammars.When processed by an SLR parser, an SLR grammar is converted into parse tables with no shift/reduce or reduce/reduce conflicts for any combination of LR(0) parser state and expected lookahead symbol.".
- SLR_grammar label "SLR grammar".
- SLR_grammar sameAs گرامر_اسالآر.
- SLR_grammar sameAs m.05p4r06.
- SLR_grammar sameAs Q7390992.
- SLR_grammar sameAs Q7390992.
- SLR_grammar wasDerivedFrom SLR_grammar?oldid=666692589.
- SLR_grammar isPrimaryTopicOf SLR_grammar.