Open-source alternatives to Ohmjs Ohm

ANTLR is a grammar-based code generator and multi-language parser generator used to design and implement custom languages. It functions as a toolkit for transforming formal language definitions into executable source code for processing structured text or binary files, while providing a framework for automatically constructing and traversing hierarchical parse trees. The project is distinguished by its ability to generate lexers and parsers in various target programming languages from a single shared grammar definition. It supports grammars containing direct left recursion and utilizes adapti

Pest is a Rust parsing library and automatic parser generator that transforms formal grammar definitions into functional parsers. It specializes in Parsing Expression Grammar to recognize and structure complex text patterns, providing a system for context-free grammar parsing. The library implements zero-copy tokenization and static grammar compilation to reduce runtime overhead. It supports no-std runtime compatibility, allowing the parser to be compiled for embedded or bare-metal environments where a standard library is unavailable. The project covers a range of parsing capabilities, inclu

Ohm is a compiler construction toolkit and parser combinator library used to build parsers, interpreters, and compilers. It provides a formal grammar language for specifying the structural rules of data formats to ensure precise parsing of input strings. The project functions as a parsing debugging tool and program execution visualizer. It generates text traces and graphical visualizations to show the step-by-step logic used during parsing and renders runtime state changes and method call hierarchies. The toolkit covers custom parser development and the construction of compilers and interpre

pycparser is a C99 parser library that converts C source code into an abstract syntax tree consisting of Python objects. It functions as an abstract syntax tree generator, transforming preprocessed C code into a structured hierarchy for programmatic analysis and transformation. The library integrates with a C preprocessor to handle directives before parsing. It also features a stub header parser, which uses minimal mock headers to allow the parsing of C code without requiring a full system C library installation. The project provides tools for static code analysis, C program analysis, and so

TrumpScript is a Python-based domain specific language and compiler extension that wraps the Python runtime to enforce custom grammar and vocabulary rules. It transforms a specialized, case-insensitive vocabulary and natural speech patterns into executable Python instructions. The implementation distinguishes itself through strict constraints on source code, including a variable name system that restricts identifiers to a predefined whitelist and a numeric parser that rejects any integer not exceeding one million. It further utilizes a token-filtering preprocessor to remove filler words and n

Rhai is an embedded scripting engine and dynamically typed language designed for integration into Rust applications. It functions as an abstract syntax tree compiler and native interop layer, allowing developers to map Rust types and functions into a scripting environment for bidirectional communication. The project serves as a framework for creating customizable domain-specific languages. It allows for the definition of custom operators, syntax, and restricted execution environments, enabling the creation of specialized languages with tailored functional sets. The engine covers a broad rang

PegJS is a parsing expression grammar tool and JavaScript parser generator. It functions as a grammar compiler that transforms formal grammar specifications into executable JavaScript code for analyzing structured text and processing complex input strings. The system generates deterministic parsers that avoid the ambiguity of context-free grammars. It utilizes a packrat parsing model with memoization to ensure linear time complexity and employs recursive descent parsing to process input in a top-down hierarchical manner. The toolset supports the implementation of domain-specific languages an

Jison is a JavaScript parser generator that implements the LALR parsing algorithm. It creates tools to analyze custom programming languages by converting structured input into tokens and trees. The project functions as a Bison-compatible generator, accepting grammars in a format compatible with the Bison parser generator to produce JavaScript parsers. It covers the requirements for compiler frontend development, including the implementation of domain-specific languages and syntax analysis tooling. Its capabilities extend to custom language parsing and the generation of parsers via a command

cel-go is a Go implementation of the Common Expression Language, providing a type-safe engine for the evaluation of non-Turing complete, side-effect-free expressions. It functions as an embedded expression engine that converts human-readable strings into type-checked abstract syntax trees to ensure safe execution. The system utilizes a compile-once evaluate-many model, parsing and validating expressions into cached programs for repeated execution across different datasets. It further distinguishes itself as a partial state evaluator, using commutative logic to compute results and return resid

Grule is a business rule engine for Go that decouples complex decision-making logic from core application code. It provides a framework for defining, versioning, and executing business rules through a domain-specific language, allowing logic to be managed independently of the underlying software implementation. The engine distinguishes itself by utilizing a formal grammar-based parser and a Rete-inspired pattern matching algorithm to evaluate logic against data facts efficiently. It supports dynamic system modeling by enabling runtime updates to policies and providing thread-safe knowledge ba

This project is a comprehensive functional programming curriculum and learning resource for Haskell. It provides sequenced educational paths and technical reference guides designed to take developers from beginner to advanced levels of proficiency. The project distinguishes itself through a deep focus on theoretical and technical foundations, offering detailed studies on type theory, category theory, and runtime internals. It includes a dedicated performance handbook for optimizing execution speed and memory management, as well as an ecosystem guide for managing development tools and editor c

nom is a parser combinator framework for Rust used to build complex parsers by combining small, reusable parsing functions. It functions as a zero-copy parsing tool that minimizes memory overhead by returning slices of the original input instead of allocating new memory. The framework is designed for diverse data formats, serving as a binary data parser with configurable endianness and a bitstream processing library capable of extracting values of arbitrary bit length. It also functions as a streaming data parser that can process data arriving in chunks and signal when additional input is req

This project is an interactive programming education resource and tutorial designed for learning the Rust programming language and systems programming concepts. It provides a collection of runnable and editable code examples that serve as a practical reference for language syntax and implementation. The resource features an interactive code sandbox that allows users to execute and test code snippets in real time. It emphasizes the verification of technical accuracy by executing embedded code blocks during the build process to ensure all examples remain functional. The content covers a compre

Tree-sitter is a parsing system and incremental parsing framework designed to generate high-performance syntax trees from source code. It functions as a language parsing engine that compiles formal grammar definitions into portable code, which can then be integrated into text editors and development tools to facilitate structural analysis, code navigation, and syntax highlighting. The project distinguishes itself through its ability to maintain valid, usable syntax tree structures even when source code contains syntax errors or incomplete fragments. It utilizes a generalized parsing algorithm

Goja is a JavaScript engine and ECMAScript compliant interpreter implemented entirely in Go. It serves as an embedded scripting engine that allows Go applications to execute JavaScript code and integrate a programmable scripting layer without relying on Cgo or external native dependencies. The project functions as a bridge between Go and JavaScript, enabling bidirectional data exchange and function invocation. It allows Go hosts to expose native structs, slices, and maps as JavaScript objects and arrays, while providing mechanisms to export script values and functions back into native Go type

Kaitai Struct is a framework for declarative binary specification that provides automated parser and serializer generation across multiple programming languages. It uses a portable, domain-specific language to describe the layout of binary files and network packets, converting these specifications into source code for reading and writing binary data. The system enables cross-language data processing by translating a single structural definition into native source code for languages including C++, C#, Go, Java, JavaScript, Python, and Rust. This approach allows the same binary data specificati

nom is a Rust parser combinator framework used to build complex parsers for binary and text data. It functions as an abstract syntax tree generator and a bit-level binary parser, allowing users to construct structured data by combining small, reusable parsing functions. The framework provides specialized support for zero-copy binary parsing, extracting data as slices from raw byte arrays to avoid memory allocations. It also includes a streaming data parser capable of processing partial input chunks from networks or files and signaling when additional input is required. The project covers a b

Penrose is a compiler that transforms structured mathematical notation into optimized SVG diagrams. It uses a three-stage pipeline of separate domain, substance, and style files to define mathematical objects, relationships, and visual presentation, then solves continuous optimization problems with user-defined spatial constraints and objectives to automatically arrange diagram elements. The system separates diagram content from visual style using distinct declarative languages, and provides a typed domain language with subtype hierarchies for mathematical objects. It supports embedding compi

This project is a comprehensive Lisp AI implementation library that provides reference implementations for various artificial intelligence paradigms and symbolic algorithms. It functions as a multi-purpose toolkit containing a logic programming engine, a natural language processing suite, and a symbolic mathematics toolkit. The library is distinguished by its diverse architectural frameworks, including a Prolog-style execution engine that uses unification and goal-driven backtracking, and a system for simulating human decision-making through expert system shells and certainty factors. It also

syn is a Rust syntax tree parser and token stream converter. It serves as a toolkit for procedural macro development, providing a framework to parse Rust source code into structured syntax trees for analysis and transformation. The project enables the manipulation of Rust abstract syntax trees through specialized visitor and folder patterns for traversing and mutating nodes. It provides a bidirectional mapping that allows developers to convert token streams into structured trees and print those trees back into tokens for code generation. The library covers a broad range of syntax analysis ca

CMake is a cross-platform build system generator and build automation tool. It is used to define build requirements and dependencies for C and C++ source code, managing the compilation and linking process across different operating systems. The project functions by generating platform-specific build files and scripts from a single configuration. This allows for the standardization of how software is compiled and packaged for compilers and development tools across various environments. The tool covers C++ project configuration and native application compilation for desktop and embedded system

Awaitility is a Java asynchronous testing library and conditional polling framework. It provides a fluent domain-specific language to synchronize tests with asynchronous operations by polling for specific states or conditions. The library allows for the configuration of polling intervals, timeouts, and the assignment of specific threads or services to handle background polling. It includes mechanisms for deadlock detection, exception filtering to treat specific errors as false results, and the ability to fail fast when a prohibited condition is met. The framework covers state verification, i

LanguageTool is a multilingual grammar and style checking engine designed to detect spelling, grammar, and writing errors across multiple languages. It provides automated proofreading capabilities that can be deployed as a self-hosted server or executed as a standalone local desktop application. The project distinguishes itself through a flexible rule development framework, allowing linguistic patterns to be defined via XML or implemented as custom Java classes. It utilizes n-gram frequency modeling for confused word detection and supports neural word embeddings to improve disambiguation betw

Knwl.js is a JavaScript named entity recognition library and rule-based text parser. It serves as an extensible information extraction tool designed to identify and pull structured entities, such as dates, times, and locations, from unstructured text strings. The library allows for the definition of specialized rules and custom plugins to identify and extract unique pieces of information. This extensibility enables the automation of information retrieval by converting human-readable text into structured formats for applications and databases. The system utilizes regular expression matching a

Premake is a build system generator and cross-platform build configuration tool. It functions as a scripting engine that transforms scripted workspace definitions into native project files for multiple build toolsets and compilers. Additionally, it can generate JSON-formatted compilation databases for use with language servers and static analysis tools. The project distinguishes itself through a programmable runtime that allows for internal function hooking and the interception of build logic. This extensibility enables users to create custom toolset generators, implement modular extensions f

Esprima is a JavaScript parser that converts source code into a structured abstract syntax tree. It implements a specification-driven grammar to ensure compliance with ECMAScript standards, enabling the programmatic analysis and transformation of JavaScript programs. The project provides capabilities for lexical tokenization to break source code into individual symbols and static syntax validation to verify that scripts are well-formed without executing the code. Its functional surface covers JavaScript static analysis, lexical analysis, and the generation of abstract syntax trees.

This project is a Ruby-based package definition repository that functions as a cross-platform package manager and software dependency resolver for macOS and Linux. It provides a centralized system for installing, updating, and managing software through a Git-based distribution model. The system distinguishes itself through a binary package distribution network that produces pre-compiled bottles to avoid local compilation from source. It utilizes a Ruby-based domain specific language to define installation recipes and employs a distributed version control architecture to synchronize these defi