antlr/antlr4

This system is the ANTLR 4 parser generator and its associated multi-language runtime libraries. It provides the core tooling to parse and transform grammars, alongside comprehensive runtime implementations for Java, C++, C#, Dart, Go, JavaScript, Python, Swift, and TypeScript. The codebase includes utilities for tree traversal, pattern matching, and error handling, ensuring consistent behavior across all supported targets.

This period marks the comprehensive development of the ANTLR v4 tooling and Java runtime, introducing a new parsing infrastructure, code generation pipeline, and parse tree API. The work includes the removal of legacy v3 components, the implementation of left-recursion handling, and the addition of multi-language support for C#, Swift, and others.

32 changes

This period focused on significantly expanding ANTLR 4's language support by introducing new code generation templates and complete runtime implementations for Python 3, JavaScript, C++, Swift, and TypeScript. The work involved building out the full stack for these targets, including error handling, tree traversal, and build system integration, while also modernizing the existing Java and Go runtimes with parallel testing and ES6 refactoring.

43 changes

This period focused on completing the ANTLR4 runtime implementations for Swift, Dart, and JavaScript, while significantly expanding test coverage and infrastructure for C++, C#, Go, PHP, and Python. The work also included refactoring Unicode data generation and establishing automated release and deployment workflows.

38 changes

antlr/antlr4 was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point the surveyor at a repository you know and see whether you agree with it.