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Topic: LL parser

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Parser

LR parser

Recursive descent parser

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	SLK Parser Generator - True LL(k) C, C++, Java, and C# parser generator with optional backtracking
		The table-driven parsers are generally less than one tenth the size of the equivalent recursive-descent parsers.
		Top-down parsing (LL) is thought to be better suited to syntax directed translation (compilers) than the bottom-up parsing technique (LALR) that is used by most parser generators.
		The SLK parser generator creates parsers that are smaller and faster than others.
	home.earthlink.net /~slkpg (1572 words)

	LL parser - Wikipedia, the free encyclopedia
		An LL parser is a top-down parser for a subset of the context-free grammars.
		The remainder of this article describes the table-based kind of parser, the alternative being a recursive descent parser which is coded by hand.
		These steps are repeated until the parser stops, and then it will have either completely parsed the input and written a leftmost derivation to the output stream or it will have reported an error.
	en.wikipedia.org /wiki/LL_parser (1403 words)

	Parsing - Wikipedia, the free encyclopedia
		Parsers for programming languages tend to be based on context-free grammars because fast and efficient parsers can be written for them.
		Parsers are usually not written by hand but are generated by parser generators.
		LL parsers will generate a leftmost derivation and LR parsers will generate a rightmost derivation (although usually in reverse).
	en.wikipedia.org /wiki/Parser (886 words)

	LL parser
		An LL parser is a table-based top-down parser for a subset of the context-free grammars.
		The parser has an input buffer, a stack on which it keeps symbols from the grammar, a parsing table which tells it what grammar rule to use given the symbols on top of its stack and its input tape.
		Now the parser sees an '1' on its input stream so it knows that it has to apply rule (1) and then rule (3) from the grammar and write their number to the output stream.
	www.ebroadcast.com.au /lookup/encyclopedia/ll/LL_parser.html (1163 words)

	LL parser: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-16)
		A compiler-compiler or parser generator is a utility for generating the source code of a parser, interpreter or compiler from an annotated language...
		A simple lr parser or slr parser is an lr parser for which the parsing tables are generated as for an lr(0) parser except that it only performs a reduction...
		A chart parser is a type of parser commonly used for natural languages that uses a data-driven approach based on a set of grammatical rules and a dictionary...
	www.absoluteastronomy.com /encyclopedia/l/ll/ll_parser1.htm (2243 words)

	NationMaster - Encyclopedia: Ll (Site not responding. Last check: 2007-10-16)
		LL Cool J. James Todd Smith (born January 14, 1968) is an American hip hop artist better known by his stage name, LL Cool J (Ladies Love Cool James).
		LL may stand for: Love Letter Late Latin The word legis (Latin for laws) in law degrees Lebanese pound, Livre Libanaise in French Linked list, a type of data structure Little league Lie-Ler, a person named Tyler who tends to lie, exaggerate, and endlessy spread rumors Long lines, a...
		An old ligature for Ll is known as the 'broken l', which takes the form of a lowercase 'l' with the top half shifted to the left, connected to the lower half with a thin horizontal stroke.
	www.nationmaster.com /encyclopedia/Ll (603 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		The running time of a recursive descent parser in the general case is exponential, although there is a modification to the algorithm called a packrat parser, which trades memory for linear time.
		In computer science, an LR parser is a type of bottom-up parser for context-free grammars that is very commonly used by computer programming language compilers (and other associated tools).
		LL parser -- Needs someone knowledgable to fill in the section on LL(k) Parsing - the information isn't generally available on the web.
	www.worldhistory.com /wiki/L/LL-parser.htm (534 words)

	LL parser (Site not responding. Last check: 2007-10-16)
		An LL parser is a table-based top-down parser for a subset of the context-free grammar s.
		An LL parser is called an LL(''k) parser if it uses k token s of look-ahead when parsing a sentence.
		When the parser starts it always starts on its stack with [ S, $ ] where $ is a special terminal to indicate the bottom of the stack and the end of the input stream, and S is the start symbol of the grammar.
	www.serebella.com /encyclopedia/article-LL_parser.html (1895 words)

	Context-free grammar - Wikipedia, the free encyclopedia
		An Earley parser is an example of such an algorithm, while LR and LL parsers only deal with more restrictive subsets of context-free grammars.
		The distinction between leftmost derivation and rightmost derivation is important because in most parsers the transformation of the input is defined by giving a piece of code for every grammar rule that is executed whenever the rule is applied.
		Therefore it is important to know whether the parser determines a leftmost or a rightmost derivation because this determines the order in which the pieces of code will be executed.
	www.sciencedaily.com /encyclopedia/context_free_grammar (1310 words)

	LL parser (Site not responding. Last check: 2007-10-16)
		Older programming languages sometimes use LL grammars because it is simple to create parsers for them byhand - using either the table-based method described here, or a recursive descent parser.
		The parser has an input buffer, a stack on which it keeps symbols from the grammar, a parsing tablewhich tells it what grammar rule to use given the symbols on top of its stack and its input tape.
		Now the parser sees an '1' on its input stream so it knows that it has to apply rule (1) and then rule (3) from the grammarand write their number to the output stream.
	www.therfcc.org /ll-parser-83437.html (1221 words)

	LL parser (Site not responding. Last check: 2007-10-16)
		The parser attempt to rewrite the contents of this to what it sees on the input However it only keeps on the stack still needs to be rewritten.
		Now the parser sees an '1' on input stream so it knows that it to apply rule (1) and then rule from the grammar and write their number the output stream.
		So the parser ends with both on its stack and on its input In this case it will report that has accepted the input string and on output stream it has written the list numbers [ 2 1 3 3 ] is indeed a rightmost derivation of the string in reverse.
	www.freeglossary.com /LL_parser (1335 words)

	ANTLR-centric Language Glossary
		LL(k) is synonymous with a "top-down" parser because the parser begins at the start symbol and works its way down the derivation/parse tree (tree here means the stack of method activations for recursive descent or symbol stack for a table-driven parser).
		A recursive-descent parser is particular implementation of an LL parser that uses functions or method calls to implement the parser rather than a table.
		In a parser, this is the nth lookahead Token object.
	www.doc.ic.ac.uk /lab/secondyear/Antlr/glossary.html (2473 words)

	Bottom Up Parsing
		Notice that the configuration of the parser corresponds to a reverse rightmost derivation.
		LL vs LR LR(k) recognizers (and their variants such as LALR(k)) are stronger than LL(k) recognizers because the LR strategy uses more context information.
		If you have an action in the middle of an LL grammar, you may simply execute it because the LL parser knows precisely where it is at any time.
	www.cs.usfca.edu /~parrt/course/652/lectures/LR.parsing.html (1273 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		In computer science, Look-Ahead LR parsers or LALR parsers are a specialized form of LR parsers that can deal with more context-free grammars than Simple LR parsers but less than LR(1) parsers can.
		LR parsers are difficult to produce by hand; they are usually constructed by a parser generator or a compiler-compiler.
		Depending on how the parsing table is generated these parsers are called Simple LR parser (SLR), Look-ahead LR parser (LALR), and Canonical LR parser.
	www.worldhistory.com /wiki/S/Simple-LR-parser.htm (177 words)

	LL - Wikipedia, the free encyclopedia
		LL is the IATA code for Lineas Aeras Allegro airline
		See also ll for the use of this double-consonant in various languages
		This page extends a two-character combination which might be any or all of: an abbreviation, an acronym, an initialism, a word in English, or a word in another language.
	en.wikipedia.org /wiki/LL (140 words)

	ipedia.com: Parser Article (Site not responding. Last check: 2007-10-16)
		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.
		For example LALR parsers are capable of efficiently analysing a wide class of context free grammars.
		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.ipedia.com /parser.html (323 words)

	Geneseo CSci 342 Fall 2001 Parsing Homework
		Interpreters of any sort often use parse trees as their central representation of whatever they are interpreting, since a parse tree makes operator-operand relationships explicit, and implies a great deal about the meaning of the text being interpreted.
		The easiest way to demonstrate that your parser works is to write a driver that uses the parser to generate a parse tree from a Web page, and that then prints that parse tree.
		I can go to a lab with you, telnet to a remote computer, see the parser on a laptop computer you bring to the meeting, etc. However, do not expect me to be able to copy the parser to my own computer and get it running during a fifteen minute meeting.
	www.cs.geneseo.edu /~baldwin/csci342/fall2001/hw-parser.html (875 words)

	LL(k) parser generator
		LALR(1) parser generators, for example YACC and BISON, have been used in compiler-writing for a number of years because of their generality.
		The class of grammars they accept is adequately large to handle most programming languages without requiring much expertise on the part of the compiler writer.
		The current version of the LL(k) parser generator is written in Icon.
	www.iit.edu /~tc/llk.htm (359 words)

	jGuru: What does LL(k) means? (Site not responding. Last check: 2007-10-16)
		Recursive-descent parsers have a method for each rule in the grammar and proceed are predictive in that each rule has to predict which alternative will match.
		However, if the parser could see ahead to both the A and what followed A on the input stream, the parser could determine which production was going to match.
		An LL(2) parser is such a creature; hence, rule a is unambiguous in the LL(2) sense.
	www.jguru.com /faq/view.jsp?EID=250871 (393 words)

	Parser - Wikipedia
		Im Allgemeinen wird ein Parser dazu verwendet, einen Text in eine neue Struktur zu übersetzen, z. B. in einen Syntaxbaum, welcher die Hierarchie zwischen den Elementen ausdrückt.
		Der in einem Webbrowser enthaltene Parser analysiert das HTML und erstellt daraus eine Beschreibung der Webseite als Datenstruktur, welche die Grafik-Maschine des Browsers anschließend graphisch auf den Bildschirm überträgt.
		Der eigentliche Parser als Implementierung eines abstrakten Automaten (meist realisiert als Kellerautomat) kümmert sich dagegen um die Grammatik der Eingabe, führt eine syntaktische Überprüfung der Eingangsdaten durch und erstellt in der Regel aus den Daten einen Ableitungsbaum (in Anlehnung an das Englische gelegentlich auch als Parse-Baum bezeichnet).
	de.wikipedia.org /wiki/Parser (512 words)

	RHUL Computer Science: Research: Languages & Architectures (Site not responding. Last check: 2007-10-16)
		Traditional parser generators such as YACC and RDP are based on `deterministic' algorithms that are guaranteed to parse strings in time proportional to their length.
		Nondeterministic parser generators will perform lookahead or backtracking in an effort to resolve conflicts that cannot be handled by their underlying (usually deterministic) parser technologies.
		None of the top-down parser generators described here are able to handle left-recursion, for instance, and there are more subtle effects that can catch you out if you do not fully understand the parser's backtracking behaviour.
	www.cs.rhul.ac.uk /research/languages/projects/lookahead_backtrack.shtml (1096 words)

	Open Directory - Computers: Programming: Compilers: Lexer and Parser Generators (Site not responding. Last check: 2007-10-16)
		IParse - An interpretting parser, meaning that it accept on the input a grammar and a source file which should be parsed according to that grammar, and produces an abstract program tree from this.
		LRgen Lexer and Parser Generator from Parsetec - LRgen is an LALR parser generator and LALR lexer generator, featuring TBNF grammar notation and LALR lexers for parser and compiler development.
		Toy Parser Generator for Python - TPG is a parser generator for Python.
	dmoz.org /Computers/Programming/Compilers/Lexer_and_Parser_Generators (1693 words)

	LALR to LL
		An LALR(1) parser doesn't have trouble with this because it is essentially "trying all the alts at once" and deciding which to use when it has enough info.
		An LL(k) parser predicts which alt to take based on the next k tokens it sees in the input stream.
		Now the parser just matches "A", then makes another decision on which alternative based on "is the next token B or D?" Note that this could also be written
	www.javadude.com /articles/lalrtoll.html (921 words)

	Ll parser - Wikipedia, the free encyclopedia
		Start the Ll parser article or add a request for it.
		Look for Ll parser in Wiktionary, our sister dictionary project.
		Look for Ll parser in the Commons, our repository for free images, music, sound, and video.
	www.sciencedaily.com /encyclopedia/ll_parser (135 words)

	Recursive descent parser in TutorGig Encyclopedia
		A 'recursive descent parser' is a top-down parser built from a set of mutually-recursive procedures or a non-recursive equivalent where each such procedure usually implements one of the production rules of the grammar.
		The running time of a recursive descent parser is exponential, although there is a modification to the algorithm called a packrat parser, which trades memory for linear time.
		Recursive descent parsers are used less often in practice than LR or LALR parsers because of their lack of speed.
	www.tutorgig.com /ed/Recursive_descent_parser (520 words)

	writing/generating a LL(1) parser for C# (grammatica?)
		I want the user of my C# program to be able to enter statements and queries to access a database using simple English sentences which I have defined the grammar for in EBNF format.
		I need a C# parser for this grammar that will allow me to determine if the statement entered by the user is valid within the defined grammar, and also, I need to know what terminal symbols were used to classify each word of the input, so that the program can interpret their sentence meaningfully.
		He goes through a fairly nice walkthrough of mapping a desk-top calculator from grammar to code generation with a hand-coded lexer and parser (recursive descent).
	channel9.msdn.com /ShowPost.aspx?PostID=15631 (366 words)

	[No title]
		In Pascal and C, the parser represents a token or nonterminal as an enumerated value; in Java, an int constant is used instead.
		The input to ParseGen is very similar to the input accepted by the LLGen parser generator that is described in Appendix C of "Crafting a Compiler with C" by Fischer and LeBlanc Jr.
		To obtain a complete parser, you must add any other type and data declarations that are necessary, a lexical analyzer, code for the action procedures, and a parse-error procedure that takes as arguments the nonterminal being parsed and the tokens that were expected but not found.
	www.ccs.neu.edu /course/csg262/ParseGen.README.txt (1175 words)

	Implementation of the JPP (Site not responding. Last check: 2007-10-16)
		A parser generator takes a grammar (which could be specified in BNF (Backus Naur Form) or another type of syntax specification) and outputs source code for a parser.
		The two kinds of parsers that we used in the development of JPP were: (1) DFA-based parsers and (2) LL(k)-based parsers.
		A DFA-based parser is intuitive; each parsed token advances the DFA to the next state until the appropriate terminal state is reached.
	www.cs.caltech.edu /~kiniry/papers/JPP/Jpp/node4.html (1933 words)

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