Open Source Parser Generators - Page 5
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Parser Generators
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Nearley
Simple, fast, powerful parser toolkit for JavaScript
Nearley is a powerful and flexible parser generator for JavaScript, capable of parsing complex grammars and languages, making it suitable for building compilers, interpreters, and data processors. -
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OOPSGen
Object Oriented Parser Generator
The goal of this project is to create a simple and easy to use parser generator that will accept a textual grammar file as an input and output modularized classes representing a limited parser interface. Long term goals include a robust grammar file syntax, output suitable for multiple programming languages, and tools for better integrating compiler functionality, parse tree manipulation, and FSM based scanner generation. -
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PEG.js
PEG.js is a parser generator for JavaScript
PEG.js is a simple parser generator for JavaScript that produces fast parsers with excellent error reporting. You can use it to process complex data or computer languages and build transformers, interpreters, compilers and other tools easily. PEG.js is still very much work in progress. There are no compatibility guarantees until version 1.0. Based on parsing expression grammar formalism, more powerful than traditional LL(k) and LR(k) parsers. Usable from your browser, from the command line, or via JavaScript API. -
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PackCC
A packrat parser generator for C
PackCC is a packrat parser generator for C, which can handle PEGs (Parsing Expression Grammars) very efficiently, and can support direct and indirect left-recursive grammar rules. -
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ParGeL is an LALR(k) parser generator, which allows creation of inheritable parsers in runtime and compile time environments. ParGeL is written 100% in Java.
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Queryparser
Parsing and analysis of Vertica, Hive, and Presto SQL
Queryparser is Uber’s open source Haskell library for parsing and analyzing SQL queries written in different dialects (Vertica, Hive, Presto). It creates a unified AST and supports name resolution using catalog metadata, enabling large-scale query analysis for lineage detection, analytics, and tooling. The parsing logic produces an AST with table and column identifiers that are "raw" or optionally qualified. Frequently, it is desirable to convert the AST over raw names to an AST over resolved names, where identifiers are fully qualified. This transformation is called "name resolution" or simply "resolution". It requires as input the full list of columns in every table and the full list of tables in every schema, otherwise known as "catalog information". The parsing logic produces an AST with table and column identifiers that are "raw" or optionally qualified. -
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A collection of tools for the SETL Programming Language, including a LALR parser generator and lexical scanner generator.
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Scala Parser Combinators
simple combinator-based parsing for Scala
scala-parser-combinators is a library that offers simple combinator-based parsing for Scala. Originally part of the Scala standard library, it allows developers to construct parsers using combinators directly in Scala code. -
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Seafox
A blazing fast 100% spec compliant, self-hosted javascript parser
Seafox is a high-performance ECMAScript parser written in JavaScript. It aims to be a fast and compliant parser for JavaScript, suitable for various tooling and analysis purposes. -
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Styx is a scanner and parser generator designed to address some shortcomings of the traditional lex/yacc combination. It has unique features like automatic derivation of depth grammar, production of the derivation tree including it's C interface which provides access to the abstract syntax tree, preservation of full source information and pretty printing to facilitate source-source translation, persistence to aid rapid interpreter writing. For application in contemporary computing environments, it supports unicode, reentrancy and offers thread-safeness.
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Swift Argument Parser
Straightforward, type-safe argument parsing for Swift
Swift Argument Parser is a type-safe, declarative library for building Swift command-line tools by annotating your command types with property wrappers like @Option, @Argument, and @Flag. It handles parsing, validation, automatic help generation, and dispatch to your run() or async entry point, letting you focus on command logic instead of boilerplate. The package supports subcommands, default values, custom parsing strategies, and rich error messages that match platform conventions. It integrates cleanly with Swift Package Manager, works well in CI, and provides incremental improvements such as Sendable conformances for wrappers to help in concurrent contexts. The issue tracker and releases show active maintenance, real-world usage patterns, and design notes for advanced scenarios like collecting unrecognized arguments or mixing parent options with subcommands. Overall, it standardizes CLI ergonomics across the Swift ecosystem with a small, testable surface. -
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TFieldedText
Fielded Text (CSV) file parser/generator
TFieldedText is a component which allows you to easily: generate and parse Fielded Text Files (eg. CSV files); and create and edit Fielded Text Meta files. For more information about the Fielded Text standard see http://www.fieldedtext.org -
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Tedir is a general purpose top-down parser library for java. Unlike a parser generator, it allows efficient parsers to be constructed at run-time, rather than at compile-time, and allows parsers to be extended while running.
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In a nutshell it takes as input the formal specification of any text protocol in ABNF and generates the parser in C language for that grammar using lex/yacc.
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The purpose of the project was to serve as a testbed for compiler technology. Currently there is a PEG parser generator and a C99 preprocessor in C.
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A backtracking (non-packrat) parser generator for parsing expression grammars. The parsers are generated at run-time using the LLVM JIT compilation engine.
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Turn.Message is .NET parser / generator of the TURN (Traversal Using Relay NAT) messages written in C#. Compatible with [MS-TURN] extension and clients based on Microsoft UCCAPI SDK.
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UA-Parser
A multi-language port of Browserscope's user agent parser
ua-parser is a multi-language library for parsing User-Agent strings into structured data, such as browser, OS, and device information. Originally created for web analytics and user tracking, it supports a wide range of platforms and is available in JavaScript, Python, Java, and other languages. ua-parser is often used in server logs, analytics dashboards, and A/B testing systems to segment traffic. -
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UML 2 Statemachine for C++
UML 2 Statemachine for C++ is a development framework with DSL support
UML 2 Statemachine Code Generator is a developer framework for an easy implementation of statemachine based applications. Here, with this framework only one Domain-specific language (DSL) specification is necessary to create executable codes for Linux, Mac OS X, and Microsoft Windows. With this framework you save a lot of time and effort during implementation; also you have an always valid - based on a well-defined C++ standard - generated code with high quality. -
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UniCC LALR(1) Parser Generator
Parser generator, targetting C, C++, Python, JavaScript, JSON and XML
UniCC (UNIversal Compiler-Compiler) compiles an augmented grammar definition into a program source code that parses the described grammar. Because UniCC is intended to be target-language independent, it can be configured via template definition files to emit parsers in almost any programming language. UniCC comes with out of the box support for the programming languages C, C++, Python (both 2.x and 3.x) and JavaScript. Parsers can also be generated into JSON and XML. -
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upgen is a scanner and parser generator, which can generate parser programs in C++, Object Pascal, ...
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The VISL Constraint Grammar Compiler is a natural language parser generator. It is an implementation of Pasi Tapanainen's CG-2 constraint grammar formalism.
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The VISL Phrase Structure Grammar Compiler is an implementation of a parser generator for ambiguous context-free grammars, ambiguous input, and ambiguous output.
