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- LR_parser abstract "In computer science, LR parsers are a type of bottom-up parsers that efficiently handle deterministic context-free languages in guaranteed linear time. The LALR parsers and the SLR parsers are common variants of LR parsers. LR parsers are often mechanically generated from a formal grammar for the language by a parser generator tool. They are very widely used for the processing of computer languages, more than other kinds of generated parsers.[citation needed]The name LR is an acronym. The L means that the parser reads input text in one direction without backing up; that direction is typically Left to right within each line, and top to bottom across the lines of the full input file. (This is true for most parsers.) The R means that the parser produces a reversed Rightmost derivation; it does a bottom-up parse, not a top-down LL parse or ad-hoc parse. The name LR is often followed by a numeric qualifier, as in LR(1) or sometimes LR(k). To avoid backtracking or guessing, the LR parser is allowed to peek ahead at k lookahead input symbols before deciding how to parse earlier symbols. Typically k is 1 and is not mentioned. The name LR is often preceded by other qualifiers, as in SLR and LALR.LR parsers are deterministic; they produce a single correct parse without guesswork or backtracking, in linear time. This is ideal for computer languages. But LR parsers are not suited for human languages which need more flexible but slower methods. Other parser methods (CYK algorithm, Earley parser, and GLR parser) that backtrack or yield multiple parses may take O(n2), O(n3) or even exponential time when they guess badly.The above properties of L, R, and k are actually shared by all shift-reduce parsers, including precedence parsers. But by convention, the LR name stands for the form of parsing invented by Donald Knuth, and excludes the earlier, less powerful precedence methods (for example Operator-precedence parser).LR parsers can handle a larger range of languages and grammars than precedence parsers or top-down LL parsing. This is because the LR parser waits until it has seen an entire instance of some grammar pattern before committing to what it has found. An LL parser has to decide or guess what it is seeing much sooner, when it has only seen the leftmost input symbol of that pattern. LR is also better at error reporting. It detects syntax errors as early in the input stream as possible.".
- LR_parser thumbnail Shift-Reduce_Parse_Steps_for_A*2+1.svg?width=300.
- LR_parser wikiPageExternalLink books?id=nEA9AAAAIAAJ&printsec=frontcover.
- LR_parser wikiPageExternalLink honalee.html.
- LR_parser wikiPageExternalLink lrk_parsing.html.
- LR_parser wikiPageExternalLink PTAPG_1st_Edition.
- LR_parser wikiPageExternalLink outline.20.html.
- LR_parser wikiPageExternalLink cparser.html.
- LR_parser wikiPageExternalLink bu-parse.html.
- LR_parser wikiPageExternalLink algorithm.html.
- LR_parser wikiPageExternalLink parsing-simulator.php.
- LR_parser wikiPageID "18030".
- LR_parser wikiPageRevisionID "597146215".
- LR_parser hasPhotoCollection LR_parser.
- LR_parser subject Category:Parsing_algorithms.
- LR_parser type Abstraction100002137.
- LR_parser type Act100030358.
- LR_parser type Activity100407535.
- LR_parser type Algorithm105847438.
- LR_parser type Event100029378.
- LR_parser type ParsingAlgorithms.
- LR_parser type Procedure101023820.
- LR_parser type PsychologicalFeature100023100.
- LR_parser type Rule105846932.
- LR_parser type YagoPermanentlyLocatedEntity.
- LR_parser comment "In computer science, LR parsers are a type of bottom-up parsers that efficiently handle deterministic context-free languages in guaranteed linear time. The LALR parsers and the SLR parsers are common variants of LR parsers. LR parsers are often mechanically generated from a formal grammar for the language by a parser generator tool. They are very widely used for the processing of computer languages, more than other kinds of generated parsers.[citation needed]The name LR is an acronym.".
- LR_parser label "Analisador sintático LR".
- LR_parser label "Analizador sintáctico LR".
- LR_parser label "Analyseur LR".
- LR_parser label "LR parser".
- LR_parser label "LR-Parser".
- LR_parser label "LR-анализатор".
- LR_parser label "LR剖析器".
- LR_parser label "LR法".
- LR_parser label "Parser LR".
- LR_parser label "Parser LR".
- LR_parser label "مجزئ يسار يمين".
- LR_parser sameAs LR-Parser.
- LR_parser sameAs Analizador_sintáctico_LR.
- LR_parser sameAs Analyseur_LR.
- LR_parser sameAs Parser_LR.
- LR_parser sameAs LR法.
- LR_parser sameAs Parser_LR.
- LR_parser sameAs Analisador_sintático_LR.
- LR_parser sameAs m.04l1w.
- LR_parser sameAs Q1756442.
- LR_parser sameAs Q1756442.
- LR_parser sameAs LR_parser.
- LR_parser wasDerivedFrom LR_parser?oldid=597146215.
- LR_parser depiction Shift-Reduce_Parse_Steps_for_A*2+1.svg.
- LR_parser isPrimaryTopicOf LR_parser.