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Topic: Canonical LR parser

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	LR parser
		An LR parser is a type of parser for context-free grammars that is very commonly used by computer programming language compilers (and other associated tools).
		Of all parsers that scan their input left to right, LR parsers detect syntactic errors (that is, when their input does not conform to the grammar) as soon as it possible to do.
		LR parsers are difficult to produce by hand; they are usually constructed by a parser generator or a compiler-compiler.
	www.ebroadcast.com.au /lookup/encyclopedia/lr/LR_parser.html (2238 words)

	Kids.Net.Au - Encyclopedia > Parser
		A parser is a computer program or a component of a program that analyses the grammatical structure of an input, with respect to a given formal grammar.
		Parsers can be made both for natural languages and for programming languages.
		For example LALR parsers are capable of efficiently analysing a wide class of context free grammars.
	www.kids.net.au /encyclopedia-wiki/pa/Parser (279 words)

	Parser - Biocrawler (Site not responding. Last check: 2007-08-20)
		A parser is a computer program or a component of a program that analyses the grammatical structure of an input, with respect to a given formal grammar, a process known as parsing.
		The task of the parser can be summarized as to determine if and how the input can be derived from the start symbol with the rules of the formal grammar.
		A parser can do this in essentially two ways: it can start with the input and attempt to rewrite it to the start symbol, a so-called bottom-up parser, or it can start with the start symbol and try to rewrite it to the input, a so-called top-down parser.
	www.biocrawler.com /encyclopedia/Parser (610 words)

	YourArt.com >> Encyclopedia >> Parsing (Site not responding. Last check: 2007-08-20)
		Generally, parsers operate in two stages, first identifying the meaningful tokens in the input, and then building a parse tree from those tokens.
		Parsers are usually not written by hand but are generated by parser generators.
		The task of the parser is essentially to determine if and how the input can be derived from the start symbol within the rules of the formal grammar.
	www.yourart.com /research/encyclopedia.cgi?subject=/Parsing (1224 words)

	xml parser - parser
		Thus, it is a common strategy to create a relaxed parser for a context-free grammar which accepts a superset of the desired language constructs (that is, it accepts some invalid constructs); later, the unwanted constructs can be filtered out.
		The parser would contain rules to tell it that the characters , +, ^, (and) mark the start of a new token, so meaningless email cvar parser* parser tokens like "12*" or "(3" will not be generated.
		In the case of a calculator, the action javascript html parser is to evaluate the expression; a compiler, on the other hand, would generate the machine language that performs the functionality stated in the code.
	www.infotechloco.com /Inf-Computer-Topics-N---Q/Parser.html (884 words)

	Britain.tv Wikipedia - Parser
		Parsing is also an earlier term for diagraming of sentences in grammar of the English language, and is still used to diagram the grammar of inflected languages, such as the Romance languages or Latin.
		Most modern parsers are at least partly statistical; that is, they rely on a corpus of training data which has already been annotated (parsed by hand).
		Parsers for programming languages tend to be based on context-free grammars because fast and efficient parsers can be written for them.
	www.britain.tv /wikipedia.php?title=Parser (1229 words)

	Parser info here at en.my-widgets.com (Site not responding. Last check: 2007-08-20)
		Most modern parsers are at molecular partly statistical; that is, they bet on a corpus of teaching declaration which has at in duration superannuated annotated (parsed by hand).
		Parsers for programming languages impel to be based on context-free grammars gaping rapid 'n masterly parsers can be written for them.
		Parsers are as plain not written by hand but are generated by parser generators.
	en.my-widgets.com /Parser (1387 words)

	Station Information - Parser
		The task of the parser can be summarized as to determine if and how the input can be derived from the start symbol with the rules of the grammar.
		As the name suggests, a Top-down parser works in principle by constructing an abstract syntax tree from the Top node on Down, usually in a pre-order tree traversal pattern.
		The syntax tree is derived according to the rules of the grammar and the current input token.
	www.stationinformation.com /encyclopedia/p/pa/parser.html (325 words)

	Design of the Honalee LR Algorithm
		The traditional approach to canonical LR(k) parsers is to generate the entire set of parser states (item sets), but this is impractical since most real-world grammars produce several hundred to several thousand states.
		There is a lot of redundancy in the LR states generated and many of the states are nearly identical, typically differing only by their look-ahead symbols.
		What is desired is the means to construct canonical LR parsing tables that are about the same size as LALR parsing tables, thus having the best of both worlds, i.e., efficient parsing of complex grammars provided by LR parsers, combined with the relatively small memory requirements of LALR parsers.
	david.tribble.com /text/honalee_hist.html (7153 words)

	Canonical LR parser
		A canonical LR parser or LR(1) parser is an LR parser whose parsing tables are constructed in a similar way as with LR(0) parsers except that the items in the item sets also contain a follow, i.e., a terminal that is expected by the parser after the right-hand side of the rule.
		LR(1) parsers can deal with a very large class of grammars but their parsing tables are often very big.
		This can often be solved by merging item sets if they are identical except for the follows, which results in socalled LALR parsers.
	www.ebroadcast.com.au /lookup/encyclopedia/lr/LR(1)_parser.html (135 words)

	Hl7 Parser (Site not responding. Last check: 2007-08-20)
		A parser is a computer program or a component of aprogram that analyses the grammatical structure of an input, with respect to a given formal grammar, aprocess known as parsing.
		The task of the parser can be summarized as to determine if and how the input can be derived from the start symbol with the rules of the formalgrammar.
		A parser can do this in essentially two ways: it can start with the input and attempt to rewrite it to the start symbol,a so-called bottom-up parser, or it can start with thestart symbol and try to rewrite it to the input, a so-called top-down parser.
	www.relativeaccess.com /File/9646-Hl7.Parser.Html (530 words)

	Honalee LR(k) Algorithm
		State tables for a bottom-up LR parser can then be constructed from the resulting item sets, providing the smallest tables necessary for an LR parser to recognize sentences from the grammar.
		The Honalee LR parser construction algorithm is predicated on some assumptions, which are presented here as theoretical conjectures.
		As a matter of fact, the resulting canonical LR item sets is the minimum collection of sets capable of recognizing the full LR grammmar, comprising the same item sets produced if the grammar is LALR or SLR, plus any additional sets to handle the additional parsing complexity if the grammar is not LALR or SLR.
	david.tribble.com /text/honalee.html (3387 words)

	Chapter 3 - Page 1 (Site not responding. Last check: 2007-08-20)
		LR parsers can be constructed to recognize virtually all programming language constructs for which context-free grammars can be written
		The principal drawback of the LR method is that it is too much work to construct an LR parser by hand for a typical programming language grammar - one needs a specialized tool - an LR parser generator.
		Canonical LR is the most powerful, and the most expensive.
	www.cis.umassd.edu /~eeberbach/courses/cis471/lectures/chap03/chap03_9.html (532 words)

	Bottom-up parsing (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-08-20)
		The productions of the parser can be used to build a parse tree of a program written in human-readable source code that can be compiled to assembly language or pseudocode.
		It is common for bottom-up parsers to take the form of general parsing engines, that can either parse or generate a parser for a specific programming language given a specification of its grammar.
		LR(n) - where n is an integer>=0 indicates an LR parser with n lookahead symbols; while languages can be designed that require more than 1 lookahead practical languages try to avoid this because increasing n can threoretically require exponentially more code and data space (in practice, this may not be as bad).
	www.e-tv.co.za.cob-web.org:8888 /b/o/t/Bottom-up_parsing.html (480 words)

	Constructing the Parsing Tables (Site not responding. Last check: 2007-08-20)
		Canonical LR(k) or LR(k) is the most general form of LR parsing and parses any language that can be parsed by a shift-reduce parser.
		Such parsers have many thousands of states for a typical programming language and are thus large.
		LALR parsers have the same number of states as the equivalent SLR parser but they are harder to construct.
	www.cs.um.edu.mt /~hzarb/CSM201/notes/lecture12/node11.html (247 words)

	[Commit] mint-2004b conclusions.tex, NONE, 1.1 intro.tex, 1.1, 1.2 mint.tex, 1.2, 1.3 nickle.tex, 1.2, 1.3 tool.tex, ...
		The development of the MINT parser generation tool is motivated by difficulties presented by the implementation of the Nickle programming -language.
		The lexer and parser simple to +write in an arbitrary language, but need to be written in a +specific target language.
		The MINT parser +and lexer generator is implemented in Nickle.
	keithp.com /pipermail/commit/2004-December/001231.html (1642 words)

	Elkhound and Elsa
		Its high performance is a result of a novel combination of GLR and LR parsing, wherein the parser decides on a token-by-token basis which algorithm to use.
		JBP, the Java Boolean Parser, is a parser generator for Java (the generated parser is Java source code) written in Java.
		Accent is parser generator based on a combination of the Earley and LL parsing algorithms.
	www.cs.berkeley.edu /~smcpeak/elkhound (3023 words)

	[No title] (Site not responding. Last check: 2007-08-20)
		In the first part, we show that the traditional LR parser construction technique produces parsers which are burdened with a substantial amount of systematic redundance.
		The new method distills those properties of LR parsers that are indispensable for their correctness; and it shows which ingredients of the traditional construction technique are responsible for guaranteeing correctness and which are responsible for nice-to-have yet dispensable properties that cause redundance.
		In the second part, we investigate the construction of LR parsers for the so-called extended context-free grammars of which syntax diagrams, Extended Backus-Naur Form, and regular right part grammars are different concrete versions.
	edocs.tu-berlin.de /diss/2001/kannapinn_soenke.htm (790 words)

	Canonical LR parser - Wikipedia, the free encyclopedia
		For example, such an item for a rule A → B C might be
		which would mean that the parser has read a string corresponding to B and expects next a string corresponding to C followed by the terminal 'a'.
		This can often be solved by merging item sets if they are identical except for the follows, which results in so-called LALR parsers.
	en.wikipedia.org /wiki/Canonical_LR_parser (538 words)

	[Commit] mint/doc draft1.txt, NONE, 1.1 fig1.fig, NONE, 1.1 regex.txt, NONE, 1.1 (Site not responding. Last check: 2007-08-20)
		Grammar rules may additionally allow the special action of changing the lexer state (also known as start condition in flex-like parser generators.) This restriction on actions is due to the difficulty of specifying arbitrary actions when the target language is unknown, as it is in the MINT architecture.
		The LR(1) parser generator algorithm is taken straight from the classic text by Aho, Sethi, and Ullman.
		We decided to implement LR(1) as opposed to SLR or LALR due to the simplicity of this algorithm and the fact that memory sizes are large enough now that the compactness of the tables is not so much of an issue.
	keithp.com /pipermail/commit/2004-November/001216.html (754 words)

	Liste des tous les algorithmes, classés par finalité.
		Parsers LL Parse une grammaire non contextuelle de haut en bas, de gauche à droite.
		Parsers LR Parse une grammaire non contextuelle de bas en haut, donc en commençant par les derniers descendants de chaque branche.
		Parsers LL construits à partir d'un ensemble de procédures s'excluant mutuellement qui représentent les règles de production de la grammaire.
	www.scriptol.org /liste-algorithmes.html (2694 words)

	LR parser - Wikipedia, the free encyclopedia
		The current state will always be the state that is on top of the stack.
		The rule numbers that will then have been written to the output stream will be [5, 3, 5, 2] which is indeed a rightmost derivation of the string "1 + 1" in reverse.
		The item E → E • + B, for example, indicates that the parser has recognized a string corresponding with E on the input stream and now expects to read a '+' followed by another string corresponding with B. edit] Item sets
	en.wikipedia.org /wiki/LR_parser (2570 words)

	:: canonicl :: related - ( canonical correlation list hour form product sum ...
		1 a according to or ordered by canon law.
		(in pl.) the canonical dress of the clergy.
		canonical correlation list hour form product sum lr parser name book hours encoding rule
	www.spell-dictionary.com /db/canonicl (82 words)

	Week 10 cs 457
		Many states in the canonical LR table are very similar.
		The action-table entries are constructed as for the canonical LR parser.
		// This is the parent stack node for a syntax stack in // an LR parser.
	www.uwgb.edu /mielkeb/cs457/week10.htm (645 words)

	[No title]
		Canonical LR(1) parser: Parsing action Goto section cd(SCcdA0SSA1A2A3A1SSA4A5A6A2SSA7A2A3A3R,3R,3A4R,1(acc)A5SSA8A5A6A6R,3A7R,2R,2A8R,2 In constructing LALR parser, we merge tables with the same common cores.
		A78 I: [C —> cC., cd(] LALR(1) parser: Parsing action Goto section cd(SCcdA0SSA1A25A36A1SSA4A25A36A25SSA78A25A36A36R,3R,3R,3A4R,1(acc)A78R,2R,2R,2 When presented with a string from the language cdcd, both the LR parser and the LALR parser make exactly the same sequence of shifts and reductions, although the names of the states on the stack may differ.
		However, when presented with erroneous input, the LALR parser may proceed to do some reductions after the LR parser has declared an error, although the LALR parser will never shift another symbol after the LR parser declares an error.
	www.csupomona.edu /~fcsang/www/cs440/LALR.doc (413 words)

	List of all algorithms, classified by purpose
		Dijkstra's shunting yard algorithm is commonly used to implement operator precedence parsers which convert from infix notation to Reverse Polish notation (RPN).
		An extension of an LR to handle nondeterministic or ambiguous grammars.
		Top-down parsers built from a set of mutually-recursive procedures that represent the production rules of the grammar.
	www.scriptol.org /list-of-algorithms.html (2687 words)

	CanonicalParseTable
		To be able to construct a parser that can follow every language constructed from the LR set we must use a huge amount of space.
		Humorous fact: The initial grammars for the Fortran, C, and Java languages could not be parsed by an LALR parse table and had to have canonical parse tables to parse it.
		With the current state of computers where space is no longer such a large consideration, it is not unadvisable to replace LALR parsers with canonical parsers.
	www.stwing.upenn.edu /~cyrusn/doc/org/metasyntactic/math/automata/CanonicalParseTable.html (239 words)

	structural editing of programs (Site not responding. Last check: 2007-08-20)
		When it consumes input, it shifts it onto the top of its > stack; and once the input is on its stack, it stays there forever, > although it will get combined with other adjacent stack elements to > produce higher-level constructs.
		It also turns out to not be a bad way for a program to work on data: load raw data onto a stack, and map or reduce them into higher-level results.
		So we'd expect parsers, even the ones without extra variables, to be able to compute a fairly large class of problems.
	lists.canonical.org /pipermail/kragen-discuss/2002-July/000849.html (284 words)

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