Eclipse Langium

Eclipse Langium provides a complete toolkit for implementing formal (domain-specific) languages in a web technology stack. The focus is on lowering the barrier to design, implement and integrate a language. This includes the following areas:

• Define the concrete syntax and derive a parser for it
• Define the abstract syntax and generate type definitions for it
• A default language server according to the Language Server Protocol (LSP) with rich default functionality
• Customization points to fine-tune all aspects of the language: linking, type system, validation, editor features, etc.
• A library to interact with the language programmatically, e.g. to implement command line interfaces (CLIs) or automation services
• Support for generating code and serializing documents
• Integration with related tools such as diagram visualizations

Eclipse Langium explicitly does not include any text editing functionality, but relies on LSP to provide support for your language in a text editor (e.g. Eclipse Theia, VS Code, Monaco Editor, etc.)

Eclipse Langium also includes a growing collection of tools for integrating domain-specific languages with AI capabilities. This allows you to optimize AI applications for generating DSL programs, automatically generate DSL implementations, or create intelligent workflows involving Langium-based DSLs. These utilities enable AI-driven applications for Langium DSLs, accelerate language engineering efforts, and facilitate more accessible DSL integrations for users.