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Type of grammar for describing formal languages
In computer science, a parsing expression grammar (PEG) is a type of analytic formal grammar, i.e. it describes a formal language in terms of a set of
Parsing_expression_grammar
Analysing a string of symbols, according to the rules of a formal grammar
analysis Parsing expression grammar Pratt parser Program transformation Shallow parsing Semantic parsing Sentence processing Syntactic parsing (computational
Parsing
Top-down parser utilizing recursion
descent parser designs Parsing expression grammar – another form representing recursive descent grammar Recursive ascent parser Tail recursive parser – a
Recursive_descent_parser
This table compares parser generators with parsing expression grammars, deterministic Boolean grammars. This table compares parser generator languages
Comparison of parser generators
Comparison_of_parser_generators
Type of parser
it takes parsing expression grammars (PEGs) as input rather than LL grammars. In 1970, Alexander Birman laid the groundwork for packrat parsing by introducing
Packrat_parser
Parsing technique
rewriting rules of a formal grammar. LL parsers are a type of parser that uses a top-down parsing strategy. Top-down parsing is a strategy of analyzing
Top-down_parsing
ISBN 978-0-13-914556-8. Ford, Bryan. Parsing Expression Grammars: A Recognition-Based Syntactic Foundation The Packrat Parsing and Parsing Expression Grammars Page
Top-down_parsing_language
Rule system for formal languages
context-free grammars. On LL grammars and LR grammars, it essentially performs LL parsing and LR parsing, respectively, while on nondeterministic grammars, it
Context-free_grammar
Top-down parser that parses input from left to right
LL parser is called an LL(k) parser if it uses k tokens of lookahead when parsing a sentence. A grammar is called an LL(k) grammar if an LL(k) parser can
LL_parser
Structure of a formal language
examining the positional relationships between pairs of words. Parsing expression grammars (PEGs): a more recent generalization of TDPL designed around
Formal_grammar
Bottom-up parser that interprets an operator-precedence grammar
operator-precedence parsers. An operator-precedence parser is a simple shift-reduce parser that is capable of parsing a subset of LR(1) grammars. More precisely
Operator-precedence_parser
Tree in formal language theory
A parse tree or parsing tree (also known as a derivation tree or concrete syntax tree) is an ordered, rooted tree that represents the syntactic structure
Parse_tree
larger framework called rules, which provide the capabilities of a parsing expression grammar, as well as acting as a closure with respect to their lexical
Raku_rules
Sequence of characters that forms a search pattern
the definition of parsing expression grammars. The result is a mini-language called Raku rules, which are used to define Raku grammar as well as provide
Regular_expression
Type of parser in computer science
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
LR_parser
discontinued Parrot virtual machine. PGE uses these rules to convert a parsing expression grammar into Parrot bytecode. It is therefore compiling rules into a program
Parser_Grammar_Engine
Brazilian computer scientist (born 1960)
in Lua. He also created LPeg, a Lua library for implementing parsing expression grammars. In 2021, Roberto created Building a Programming Language, a
Roberto_Ierusalimschy
Formalism to describe programming languages
(IETF) protocols. Parsing expression grammars build on the BNF and regular expression notations to form an alternative class of formal grammar, which is essentially
Backus–Naur_form
Topics referred to by the same term
Co., an Iranian company Parsing expression grammar, a type of analytic formal grammar that describes a formal language Parsing, syntax analysis, or syntactic
Parse_(disambiguation)
Formal means of expressing grammar
an article called "Parsing as Deduction", describing things such as how the Earley Deduction proof procedure is used for parsing. Pereira also collaborated
Definite_clause_grammar
Algorithm for parsing context-free languages
In computer science, the Earley parser is an algorithm for parsing strings that belong to a given context-free language. Named after its inventor Jay Earley
Earley_parser
site Alexander Okhotin's Conjunctive Grammars Page Alexander Okhotin's Boolean Grammars Page The Packrat Parsing and Parsing Expression Grammars Page
Syntactic_predicate
Research Institute. The language is based on parsing expression grammars (PEGs), rather than context-free grammars, with the intent to provide "a natural and
OMeta
Yacc-compatible parser generator program
shell uses a yacc grammar for parsing the command input. Bison's own grammar parser is generated by Bison. CMake uses several Bison grammars. GCC started out
GNU_Bison
Formal language generated by context-free grammar
automaton and can be parsed by a LR(k) parser. See also parsing expression grammar as an alternative approach to grammar and parser. The class of context-free
Context-free_language
Problem in computer programming
non-ambiguous context-free grammar. Alternatively, one may rely on a non-context-free grammar or a parsing expression grammar. The problem can also be solved
Dangling_else
Software programming optimization technique
Ford demonstrated that memoization could guarantee that parsing expression grammars could parse in linear time even those languages that resulted in worst-case
Memoization
Type of context-free grammar
context-sensitive parsing rules, so the overall phrase grammar is unambiguous.[citation needed] Some parsing algorithms (such as Earley or GLR parsers) can generate
Ambiguous_grammar
Form of source code, without regard to meaning
conform to the formal grammars of the programming language. The parsing stage itself can be divided into two parts: the parse tree, or "concrete syntax
Syntax (programming languages)
Syntax_(programming_languages)
Programming language designed by Carl Sassenrath
dialect belongs to the family of grammars represented by the top-down parsing language or the parsing expression grammar (PEG). The main similarity is the
Rebol
Constructed human language based on predicate logic
Lojban. As with some programming languages, Lojban grammar can be parsed using parsing expression grammars. Lojban has been shown to be translated in some
Lojban
Processing of natural language by a computer
of potential parses (most of which will seem completely nonsensical to a human). There are two primary types of parsing: dependency parsing and constituency
Natural_language_processing
Program that generates parsers or compilers
TREE-META Yacc Xtext XPL JavaCC Parsing expression grammar LL parser LR parser Simple LR parser LALR parser GLR parser Domain analysis Domain-specific
Compiler-compiler
Technique in computer programming
In computer programming, the lexer hack is a solution to parsing a context-sensitive grammar such as C, where classifying a sequence of characters as
Lexer_hack
Topics referred to by the same term
procedure Polyethylene glycol, a chemical polymer Parsing expression grammar, a type of formal grammar used in mathematics and computer science PCI Express
Peg
Type of formal grammar
evaluation of arithmetic expressions, attribute grammar may be used to describe the entire task to be performed besides parsing in straightforward way;
Attribute_grammar
Context-free formal grammar
terminal, and the lexer parse any integer as num; E represents an arithmetic expression, T is a term and F is a factor. and the Parsing table: In computer
Simple_precedence_grammar
Theory of computer sciences
{Factor}}\rightarrow ({\mathit {Expression}})\mid {\mathit {Integer}}} Parsing the string "1 - 2 - 3" with the first grammar in an LALR parser (which can handle left-recursive
Left_recursion
Parser generator program
or ANother Tool for Language Recognition, is a parser generator that uses a LL(*) algorithm for parsing. ANTLR is the successor to the Purdue Compiler
ANTLR
This is a comparison of regular expression engines. Formerly called Regex++. One of fuzzy regular expression engines. Included since version 2.13.0. ICU4J
Comparison of regular expression engines
Comparison_of_regular_expression_engines
Conversion of character sequences into token sequences in computer science
grammar, which defines the lexical syntax. The lexical syntax is usually a regular language, with the grammar rules consisting of regular expressions;
Lexical_analysis
Formal grammar derived from a deterministic pushdown automaton
Knuth's table-building algorithm. Deterministic parsing LL parser Chomsky, Noam (1962). "Context Free Grammars and Pushdown Storage". Quarterly Progress Report
Deterministic context-free grammar
Deterministic_context-free_grammar
compactness of a binary form and maximizing the speed of parsing. The particular subset of general S-expressions applicable here is composed of atoms, which are
Canonical_S-expressions
Natural language processing methodology
appear) Bick, Eckhard. 2000. The Parsing System "Palavras": Automatic Grammatical Analysis of Portuguese in a Constraint Grammar Framework. Aarhus: Aarhus University
Constraint_grammar
Markup language and file format
elements of the element being parsed. Pull-parsing code can be more straightforward to understand and maintain than SAX parsing code. The Document Object
XML
Parser generator written in C++
parser that is capable of parsing rather ambiguous grammars. Spirit can be used for both lexing and parsing, together or separately. This framework is part
Spirit_Parser_Framework
Topics referred to by the same term
person who engages in compulsive hoarding Packrat parser, a parser that uses a parsing expression grammar Peter Pack Rat, a 1985 arcade game Packrat (Transformers)
Pack_rat_(disambiguation)
Family of theories within the field of cognitive linguistics
computationally implemented formalism for construction grammars and proposes a uniform mechanism for parsing and production. Moreover, it has been demonstrated
Construction_grammar
Class of bottom-up parsing methods
parsing methods most commonly used for parsing programming languages, LR parsing and its variations, are shift-reduce methods. The precedence parsers
Shift-reduce_parser
Hierarchy of classes of formal grammars
declarations and scope. Often a subset of grammars is used to make parsing easier, such as by an LL parser. For example, the context-free language L =
Chomsky_hierarchy
Programming language
tried when the current one succeeds. This idea is also used in parsing expression grammars. CDL3 is the third version of the CDL language, significantly
Compiler_Description_Language
Notation techniques for grammars in computer science
can be generated by a given W-grammar. Hence, their use must be seriously constrained when used for automatic parsing or translation. Restricted and
Van_Wijngaarden_grammar
Research tradition in linguistics
explanations deliver a simpler theory of grammar at the cost of additional assumptions about memory and parsing. As a result, the choice between a competence-based
Generative_grammar
Abstract grammatical formalism
linguistics, combinatory categorial grammar (CCG) is an efficiently parsable, yet linguistically expressive, grammar formalism. It has a transparent interface
Combinatory categorial grammar
Combinatory_categorial_grammar
Parser generator
integration without affecting C integration. The parser grammars are augmented with m4 macros. "The Lemon LALR(1) Parser Generator". SQLite. SQLite. 2022-04-18
Lemon_(parser_generator)
Data serialization format
separators. This is a simple context-free grammar for a tiny subset of English written as an S-expression, where S = sentence, NP = Noun Phrase, VP =
S-expression
LR-attributed grammar Myhill–Nerode theorem Parsing expression grammar Prefix grammar Pumping lemma Recursively enumerable language Regular expression Regular
List of formal language and literal string topics
List_of_formal_language_and_literal_string_topics
systems 2002 – Packrat parser developed for generating a parser that parses PEG (Parsing expression grammar) in linear time parsing developed by Bryan Ford
Timeline_of_algorithms
Type of formal grammar
language. Regular expression, a compact notation for regular grammars Regular tree grammar, a generalization from strings to trees Prefix grammar Chomsky hierarchy
Regular_grammar
tables are saved to a Compiled Grammar Table file to be used later by a parsing engine. At this point, the GOLD Parser Builder is no longer needed. In
GOLD_(parser)
both parsing and rewriting rules, allowing for expression of a wide range of grammar-based techniques such as agile parsing. The first component parses the
TXL_(programming_language)
external tools. For parsing, Moose provides a novel framework that makes use of several parsing technologies (like parsing expression grammar) and that provides
Moose_(analysis)
actions by attaching one such action to each rule of a grammar. Thus, parsing a string of the grammar produces a sequence of rule applications. SDT provides
Syntax-directed_translation
Binary tree representing a mathematical expression
\neg } (NOT). Expression (mathematics) Term (logic) Context-free grammar Parse tree Abstract syntax tree Bruno R. Preiss (1998). "Expression Trees". Archived
Binary_expression_tree
Language for controlling a computer
Type-2 grammar, i.e., they are context-free grammars. Some languages, including Perl and Lisp, contain constructs that allow execution during the parsing phase
Programming_language
Software that translates code from one programming language to another
known as parsing) involves parsing the token sequence to identify the syntactic structure of the program. This phase typically builds a parse tree, which
Compiler
Programming language for developing scalable web applications
first-class citizen objects, for instance HTML and parsers, based on parsing expression grammars. Because of this adhesion between the language and web-related
Opa_(programming_language)
Sequence of words formed by specific rules
those strings generated by some formal grammar; those strings described or matched by a particular regular expression; those strings accepted by some automaton
Formal_language
Tree representation of the abstract syntactic structure of source code
reflects the grammatical structure used to parse the source text and may contain nodes corresponding to grammar productions or syntactic elements that are
Abstract_syntax_tree
Human-readable data serialization language
extend the grammar to include Javascript's /*...*/ comments. Handling such edge cases may require light pre-processing of the JSON before parsing as in-line
YAML
Programming language derived from Perl
capabilities of context-sensitive parsing formalisms (such as the syntactic predicates of parsing expression grammars and ANTLR), as well as acting as
Raku_(programming_language)
terminals of the grammar. A parser that exploits these relations is considerably simpler than more general-purpose parsers, such as LALR parsers. Operator-precedence
Operator-precedence_grammar
Natural language processing task
vision, semantic parsing is a process of segmentation for 3D objects. Early research of semantic parsing included the generation of grammar manually, as well
Semantic_parsing
definitions (grammars can import subgrammars) which enables reuse Supports annotations The following example defines a simple Boolean expression syntax in
Syntax_Definition_Formalism
Syntactic ambiguity in C++
The most vexing parse is a counterintuitive ambiguity resolution in C++. In certain situations, the C++ grammar cannot distinguish between initializing
Most_vexing_parse
List of programming languages types and the languages that meet its description
version of Lex) JavaCC lex (Lexical Analysis, from Bell Labs) M4 Parsing expression grammar (PEG) Prolog Emacs Lisp Lisp Raku SableCC Scheme yacc (yet another
List of programming languages by type
List_of_programming_languages_by_type
lookahead input symbols that are used in making parsing decisions. Knuth proved that LR(k) grammars can be parsed with an execution time essentially proportional
History of compiler construction
History_of_compiler_construction
after y[i] is evaluated in the expression). The binding of operators in C and C++ is specified by a factored language grammar, rather than a precedence table
Operators_in_C_and_C++
Text corpus with tree annotations
parser assigns some syntactic structure which linguists then check and, if necessary, correct. In practice, fully checking and completing the parsing
Treebank
(2019). Parmentier Y, Waszczuk J (eds.). Representation and parsing of multiword expressions: Current trends (pdf). Berlin: Language Science Press. doi:10
Multiword_expression
parser Simple precedence parser Packrat parser: a linear time parsing algorithm supporting some context-free grammars and parsing expression grammars
List_of_algorithms
Markup language
context. The SGML standard characterizes parsing as a state machine switching between recognition modes. During parsing, there is a stack of maps that configure
Standard Generalized Markup Language
Standard_Generalized_Markup_Language
Interpreted programming language first released in 1987
Turing-complete grammar because parsing can be affected by run-time code executed during the compile phase. The code cannot be parsed by a straight Lex/Yacc
Perl
Parser generator
parser generator, generating a LALR parser (the part of a compiler that tries to make syntactic sense of the source code) based on a formal grammar,
Yacc
Approach to natural language semantics
categories of expressions are either similarly function applications, or higher-order functions. The following are the rules of the grammar, with the first
Montague_grammar
Formal grammar defining the syntax of tokens
token. This is frequently defined in terms of regular expressions. For instance, the lexical grammar for many programming languages specifies that a string
Lexical_grammar
Function defined on formal languages in computer science
equations with regular expression operators, which are equivalent to context-free grammars. This insight was used to derive parsing algorithms for context-free
Brzozowski_derivative
When formal languages generate the same set of strings
context-free grammars, given in Backus-Naur form: <expression> ::= <expression> "+" <expression> | <expression> "-" <expression> | <expression> "*" <expression> |
Equivalence (formal languages)
Equivalence_(formal_languages)
Programming language
factor}; factor = ident | number | "(" expression ")"; It is rather easy for students to write a recursive descent parser for such a simple syntax. Therefore
PL/0
Programming language
(zero or more) sequence operator. The expr parsing equation written in META II is a conditional expression evaluated left to right: expr = term $( '+'
META_II
Longest-match principle in parsing
Van Wyk, Eric; Schwerdfeger, August (2007). "Context-aware scanning for parsing extensible languages". Proceedings of the 6th international conference
Maximal_munch
Study of meaning in language
For example, the last part of the expression "the woman who likes Beethoven" specifies which woman is meant. Parse trees can be used to show the underlying
Semantics
Implementation of Smalltalk-80
created by Avi Bryant. Amber and Clamato both use parsing expression grammar (PEG) libraries to parse Smalltalk source code. Amber uses the JavaScript
Amber_Smalltalk
Language of ancient Sumer and Babylon
(2010: 170) Zólyomi (2017: 21) Zólyomi (2000: 9–13) ETCSRI's Morphological Parsing. Accessed 13.06.2024 Sallaberger (2023: 105) Hayes (2000: 236–237) Attinger
Sumerian_language
Lexical analyzer generator
Lex is often used to produce such a token-stream. Scannerless parsing refers to parsing the input character-stream directly, without a distinct lexer
Lex_(software)
Visual description of context-free grammar
standard. We use arithmetic expressions as an example, in various grammar formats. BNF: <expression> ::= <term> | <term> "+" <expression> <term> ::= <factor>
Syntax_diagram
Unix shell
lack of an expression grammar, the sh script uses command substitution and the expr command. (Modern POSIX shell does have such a grammar: the statement
C_shell
C++ template metaprogramming technique
vector math, the Spirit parser framework uses expression templates to represent formal grammars and compile these into parsers. Optimizing compiler – Compiler
Expression_templates
Grammar of the Dutch language
outlines the grammar of the Dutch language, which shares strong similarities with German grammar and also, to a lesser degree, with English grammar. Vowel length
Dutch_grammar
Language consisting of balanced strings of brackets
applications in the parsing of expressions that must have a correctly nested sequence of brackets, such as arithmetic or algebraic expressions. Let Σ = { [
Dyck_language
travel, tourism, insurance
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
PARSING EXPRESSION-GRAMMAR
travel, tourism, insurance