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The computer program yacc is a parser generator developed by Stephen C. Johnson at AT&T for the Unix operating system. Computer programs (also software programs, or just programs) are instructions for a Computer. A compiler-compiler or compiler generator is a tool that creates a parser, interpreter, or Compiler from some form of formal description Stephen Curtis Johnson spent nearly 20 years at Bell Labs and AT&T, where he wrote Yacc, Lint, and the Portable C Compiler. Before proposing a merge request please see Talk and see if the merger you propose has recently been made and Unix (officially trademarked as UNIX, sometimes also written as Unix with Small caps) is a computer The name is an acronym for "Yet Another Compiler Compiler. In hacker jargon, the use of yet another as a way of padding out an Acronym is fairly common A compiler-compiler or compiler generator is a tool that creates a parser, interpreter, or Compiler from some form of formal description " It generates a parser (the part of a compiler that tries to make syntactic sense of the source code) based on an analytic grammar written in a notation similar to BNF. In Computer science and Linguistics, parsing, or more formally syntactic analysis, is the process of analyzing a sequence of tokens to A compiler is a Computer program (or set of programs that translates text written in a computer language (the source language) into another In Computer science, source code (commonly just source or code) is any sequence of statements or declarations written in some Human-readable In Formal semantics, Computer science and Linguistics, a formal grammar (also called formation rules) is a precise description of a Formal In Computer science, Backus–Naur Form ( BNF) is a Metasyntax used to express Context-free grammars that is a formal way to describe Formal Yacc generates the code for the parser in the C programming language. In Communications a code is a rule for converting a piece of Information (for example a letter, Word, Phrase, or In Computer science and Linguistics, parsing, or more formally syntactic analysis, is the process of analyzing a sequence of tokens to tags please moot on the talk page first! --> In Computing, C is a general-purpose cross-platform block structured

Yacc used to be available as the default parser generator on most Unix systems. It has since been supplanted as the default by more recent, largely compatible, programs such as Berkeley Yacc, GNU bison, MKS yacc and Abraxas pcyacc. Berkeley Yacc is a reimplementation of the Unix Parser generator Yacc, originally written by Robert Corbett in 1990. GNU bison is a Parser generator that is part of the GNU project. This article is about MKS Inc the software vendor For other uses see MKS. An updated version of the original AT&T version is included as part of Sun's OpenSolaris project. OpenSolaris is an Open source project created by Sun Microsystems to build a developer community around Solaris Operating System technology Each offers slight improvements and additional features over the original Yacc, but the concept has remained the same. Yacc has also been rewritten for other languages, including Ratfor, EFL, ML, Ada, Java, and Limbo. Ratfor (short for RAT ional FOR tran is a Programming language implemented as a Preprocessor for Fortran 66 ML is a general-purpose Functional programming language developed by Robin Milner and others in the late 1970s at the University of Edinburgh, whose syntax Ada is a structured, Statically typed, imperative, and object-oriented high-level computer Programming language Limbo is a Programming language for writing distributed systems and is the language used to write applications for the Inferno Operating system

The parser generated by Yacc requires a lexical analyzer. In Computer science, lexical analysis is the process of converting a sequence of characters into a sequence of tokens Lexical analyzer generators, such as Lex or Flex are widely available. In Computer science, lex is a program that generates lexical analyzers ("scanners" or "lexers" flex (fast Lexical analyzer generator is a Free software alternative to lex. The IEEE POSIX P1003. The Institute of Electrical and Electronics Engineers or IEEE (read eye-triple-e) is an international Non-profit, professional organization POSIX (ˈpɒzɪks or "Portable Operating System Interface" is the collective name of a family of related standards specified by the IEEE to define 2 standard defines the functionality and requirements for both Lex and Yacc. In Engineering, a requirement is a singular documented need of what a particular product or service should be or do

Some versions of AT&T Yacc have become open source. Open source is a development methodology which offers practical accessibility to a product's source (goods and knowledge For example, source code (for different implementations) is available with the standard distributions of Plan 9 and OpenSolaris. In Computer science, source code (commonly just source or code) is any sequence of statements or declarations written in some Human-readable Plan 9 from Bell Labs is a Distributed operating system, primarily used for research OpenSolaris is an Open source project created by Sun Microsystems to build a developer community around Solaris Operating System technology

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Python is a general-purpose High-level programming language. Its design philosophy emphasizes programmer productivity and code readability NOTES FOR EDITORS "Perl" is not an acronym (read the "Name" section below
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