Open Source Parser Generators - Page 5

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.

A collection of tools for the SETL Programming Language, including a LALR parser generator and lexical scanner generator.

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. ​

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.​

Python EBNF parser generator for use with mx.TextTools

Soul is a recursive descent parser generator tool for Windows and Linux that comes with a parsing library.

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.

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.

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

A portable and retargetable lexer/parser generator.

Scannerless recursive descent C++ parser generator

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.

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.

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.

Spirit is an object oriented recursive descent parser generator framework implemented using template meta-programming techniques.

A backtracking (non-packrat) parser generator for parsing expression grammars. The parsers are generated at run-time using the LLVM JIT compilation engine.

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.

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.

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.

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.

upgen is a scanner and parser generator, which can generate parser programs in C++, Object Pascal, ...

The VISL Constraint Grammar Compiler is a natural language parser generator. It is an implementation of Pasi Tapanainen's CG-2 constraint grammar formalism.

The VISL Phrase Structure Grammar Compiler is an implementation of a parser generator for ambiguous context-free grammars, ambiguous input, and ambiguous output.

Waxeye is a parser generator based on parsing expression grammars (PEGs). It supports C, Java, Javascript, Python, Ruby and Scheme.

Wisent is an LALR(1) parser generator with pluggable front- and backends. It generates object-oriented code with clean namespace separation. A yacc-like frontend is currently accompanied by a C++ and a Java backend. The tool itself is implemented in C++.