| BtYacc: BackTracking Yacc - A modified version of yacc that supports automatic backtracking and semantic disambiguation to parse ambiguous grammars. It also has syntactic sugar for inherited attributes.
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| oolex (object-oriented lexer) - Approaches lexical analysis by basing the scanner strictly on the object-oriented paradigm. It can be extended without access to the source code in that symbol recognizers can be derived by inheritance and an executing scanner can be reconfigured for different contexts.
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| GNU Bison - A general-purpose parser generator that converts a grammar description for an LALR context-free grammar into a C program to parse that grammar. [Open source, GPL]
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| Depot4 homepage - A simple to use translator generator.
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| LLgen parser generator - A tool for generating an efficient recursive descent parser from an ELL(1) grammar. The grammar may be ambiguous or more general than ELL(1): there are both static and dynamic facilities to resolve the ambiguities.
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| The SYNTAX System - A set of tools for the design and implementation of the front-end part of translators. The SYNTAX tools allow the generation of analyzers and the compilation of source texts with those analyzers. This has all the capabilities of lex and yacc plus some additional features including better error processing, i.e. an automatic (and tunable) error repair and recovery mechanism.
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| ProGrammar - object-oriented grammar definition language and integrated suite of visual tools that assist in building, testing and debugging parsers.
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| Toy Parser Generator for Python - TPG is a parser generator for Python. Given a simple attributed grammar, TPG produces a Python Recursive Descent Parser. It is simple and useful for small parsers of everyday life.
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| Happy - A parser generator for Haskell.
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| The LEMON Parser Generator - Very simple LALR(1) open-source parser generator. Outputs C, claims to produce faster parsers than yacc/bison.
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| Turbo Pascal Lex/Yacc - a compiler generator for Turbo Pascal and compatibles. The package contains two programs, TP Lex and Yacc, which are approximately compatible with the UNIX utilities Lex and Yacc, but are written in and produce code for the Turbo Pascal programming language. The present version works with all recent flavours of Turbo/Borland Pascal, including Delphi and Free Pascal Compiler, a GPL'ed Turbo Pascal-compatible compiler which currently runs on DOS and Linux.
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| A Compact Guide to Lex and Yacc - Tutorial in Lex and Yacc, tools that simplify compiler construction.
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| iburg, A Tree Parser Generator - Generates fast tree parsers for cost-augmented tree grammars. A variant of iburg is used in the code generators for lcc.
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| Yacc++(R) and the Language Objects Library - Object-oriented rewrite of Lex and Yacc for C++, with automatic AST class generation, grammar inheritance, minimal state ELR(1) and technology. (Commercial package)
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| PCCTS Resources and - The primary source of maintenance releases for the PCCTS compiler construction tool set. PCCTS is an LL(k) recursive descent parser generator with semantic predicates and backtracking. It was developed by T.J. Parr.
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| CppCC (C++ Compiler Compiler) - a scanner+LL(k = 1..Inf) parser generator for C++. Allows easy top-down description of grammars in an intuitive and extensible manner. Good generated code speed (as comared to GNU Flex/Bison). [Open source, GPL]
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| BtYacc patches: BackTracking Yacc - The version of BtYacc on siber.com suffers from a few minor, but annoying bugs. This is a page with patches.
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| The LEX & YACC Page - All about Lex, Yacc, Flex, and Bison: Overview, Online Documentation, Papers, Tools, Pointers
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| YooLex (Yet another Object-Oriented Lex) - A Flex like scanner code generator, but it generates C++ scanner classes that are re-entrant and compatible with the newer standard of C++/STL. Multiple scanner classes and instances can co-exist in a program without tweaking of macros.
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| Spirit C++ Parser Framework - An object oriented recursive descent parser generator framework implemented using template meta-programming techniques. Expression templates allow to approximate the syntax of Extended Backus Normal Form (EBNF) completely in C++.
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| YAY - Yet Another YACC - Closed-source, but free LALR(2) parser generator, accepts yacc input with some extensions.
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| Elkhound: A GLR Parser Generator - Almost as fast as Bison (for deterministic portions of input), but can parse any context-free grammar. [Open source, BSD]
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| PRECC - A PREttier Compiler-Compiler - an infinite-lookahead parser generator for context dependent grammars which generates ANSI C code. Specification scripts are in very extended BNF with inherited and synthetic attributes allowed. Scripts can be compiled in separate modules and later linked together, and meta-production rules are allowed. Converter for yacc scripts is available.
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| AnaGram: LALR Parser Generator - AnaGram provides a powerful grammar notation, special features for maintenance of highly configurable parsers, visual parsing and unique interactive debugging tools, supporting thread-safe parsers. The program produces C/C++ parsers for use on any platform and runs under Win9x/NT. A free trial copy is available.
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| Visual Parse++ 4.0 - The tool allows visual design of lexers and parsers for use in C++, Java, Delphi and Visual Basic applications under UNIX, Linux and Windows/NT. New to version 4.0 is support for XML, XPath, XSLT, XPointer, XQL, DTD and Namespaces.
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| Bison++ and Flex++ - (FTP) A retargeting of bison-1 and flex 2.3 to C++, able to generate classes. As with Bison and Flex, these two tools are independent but designed for mutual compatibility. Examples are provided to help in getting started.
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| Styx - A scanner and lalr(1) parser generator. It has features like automatic derivation of depth grammar, production of the abstract syntax tree including its C interface and preserves full source information to faciliate source-source translation.
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| Rie - This compiler frontend generation system based on an ECLR-attributed grammar is open source, written in C and may be regarded as an extension of Yacc/Bison.
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| Oops - An object-oriented parser generator implemented in Java.
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| The RDP parser generator - A parser generator which compiles attributed LL(1) grammars decorated with C semantic actions into recursive descent compilers.
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| ClearParse - A small, flexible parsing engine with practically unlimited backtracking capability. [Commercial]
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| Flex for Microsoft Visual C++ 6.0 and .Net - Describes how to build Flex using Microsoft Visual C++ 6.0 and .Net.
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| GOLD Parser - A free parser generator. Unlike common compiler-compilers, the GOLD Parser does not require you to embed your grammar directly into your source code. Instead, the Builder analyzes the grammar description and saves the parse tables to a separate file. This file can be subsequently loaded by the actual parser engine and used. Currently the GOLD Parser Engine is available in Java, .NET and ActiveX. [Open Source]
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| GradSoft YaYacc - Yet another Yacc, which accept yacc grammar nad produce C++ template-based reentrant code. [Open Source, BSD license]
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| Elex - A multi-language scanner generator package which generates a scanner (i.e. a lexer) from a specification oriented around regular expressions. Elex differs from most other scanner generators in that it supports multiple languages.
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| 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. Very compact implementation.
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| VLCC: A Compiler-Compiler for Visual Languages - A powerful tool for the automatic generation of Visual Programming Environments (Windows 3.x/95/NT), generated Borland C++ 4.53 compatible source code.
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| jay - A version of yacc for Java rather than C. Documentation in German.
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| Lex/YACC (actually Flex and Bison) - Flex/Bison ports to Win32, includes MAN pages, and email list for peer to peer support.
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| JB2CSharp - A port of the Java-Bison/Flex software developed by the Serl project at the University of Colorado, Boulder. Parsers and lexers will be able to use C# actions. The open source .NET project Mono has requested the port, and here it is. [Open source, BSD License]
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| Coco/R compiler generator - Coco/R combines the functionality of the well-known UNIX tools lex and yacc, to form an extremely easy to use compiler generator that generates recursive descent parsers, their associated scanners, and (in some versions) a driver program, from attributed grammars (written using EBNF syntax with attributes and semantic actions) which conform to the restrictions imposed by LL(1) parsing (rather than LALR parsing, as allowed by yacc).
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| GNU Flex - A fast lexical analyser generator. It is a tool for generating programs that perform pattern-matching on text. There are many applications for Flex, including writing compilers in conjunction with GNU Bison. [Open source, GPL]
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| Grammatica - Grammatica is a free LL(k) parser generator (compiler compiler) for C# and Java. Support for automatic error recovery, and instant parsing is available.
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| Pattern matching - Pattern matching in syntax analysis as influenced by SNOBOL4. The library distributed under the GNU Library General Public License provides for recursive patterns, various iterators and user-defined patterns along with bindings for Ada, K&R C/ANSI C/C++.
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| SGLR: a Scannerless Generalized LR parser - Interprets parse tables generated from an SDF2 syntax definition. Scannerless means that no scanner is used to tokenize the input stream; the parse table contains enough information for both the lexical and the context-free syntax. [Open source, LGPL]
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| Hapy - A runtime parser generator library. It generates parsers from BNF-like language grammars. Parsing scripting languages and communication protocol messages are typical use cases. [Public domain]
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| re2c lexer generator - re2c is a tool for writing fast and flexible lexers. A re2c generated scanner is usually 2-3 times faster than a flex based scanner, and its input model is much more flexible.
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| The SLK Parser Generator - Produces compact and efficient table-driven LL(k) parsers in C, C++, C#, and Java. Features include automated grammar transformations, clean EBNF syntax, backtracking, new LL(k) algorithms, and an uncomplicated API.
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| Lex and Yacc for Delphi 3 - Port of lex and yacc to Delphi 3. Base at port to Turbo Pascal.
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| Ragel State Machine Compiler - Compiles FSM from regular languages into executable C code. The GPL'ed software can be used to create a parser for any language that is regular. Examples include parsing Unix mailbox files and general lexing tasks.
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| TextTransformer - A parsergenerator, a simple c++ interpreter and an interactive debugger combined to a visual devellopment environment, which analyzes, evaluates, converts texts immediately.
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| EAG - A compiler compiler that uses the Extended Affix Grammar (EAG) formalism which describes both the context free and context sensitive syntax of language. The compiler generates either a recognizer or a transducer or a translator or a syntax-directed editor for a described language.
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