Ads
related to: lex and yacc pdf viewer
Search results
Results From The WOW.Com Content Network
Yacc (Yet Another Compiler-Compiler) is a computer program for the Unix operating system developed by Stephen C. Johnson.It is a lookahead left-to-right rightmost derivation (LALR) 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, written in a notation similar to Backus–Naur form (BNF). [1]
[3] [4] It is frequently used as the lex implementation together with Berkeley Yacc parser generator on BSD-derived operating systems (as both lex and yacc are part of POSIX), [5] [6] [7] or together with GNU bison (a version of yacc) in *BSD ports [8] and in Linux distributions.
Lex is a computer program that generates lexical analyzers ("scanners" or "lexers"). [ 1 ] [ 2 ] It is commonly used with the yacc parser generator and is the standard lexical analyzer generator on many Unix and Unix-like systems.
Context-free languages are a category of languages (sometimes termed Chomsky Type 2) which can be matched by a sequence of replacement rules, each of which essentially maps each non-terminal element to a sequence of terminal elements and/or other nonterminal elements.
The most established is lex, paired with the yacc parser generator, or rather some of their many reimplementations, like flex (often paired with GNU Bison). These generators are a form of domain-specific language , taking in a lexical specification – generally regular expressions with some markup – and emitting a lexer.
Another, "TWS", was created by Frank DeRemer and Tom Pennello. Today, there are many LALR parser generators available, many inspired by and largely compatible with the original Yacc, for example GNU bison, a pun on the original Yacc/Yak. See Comparison of deterministic context-free language parser generators for a more detailed list.
Ox is an attribute grammar compiling system that augments Lex and Yacc specifications with definitions of synthesized and inherited attributes written in a combination of Ox and C/C++ syntax. From these specifications, Ox generates ordinary Lex and Yacc specifications that build and decorate an attributed parse tree.
Google Chrome: Includes a PDF viewer. GSview: Open source software and Ghostscript's viewer for Windows. Microsoft Edge: Includes a PDF viewer. Microsoft Reader: A discontinued PDF viewer in Windows 8.1. Mozilla Firefox: Includes a PDF viewer. MuPDF: Free lightweight document viewer. Nitro PDF Reader: Freeware (though proprietary) PDF reader ...