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langium-quickstart.md

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Welcome to your Langium VS Code Extension

What's in the folder

This folder contains all necessary files for your language extension.

  • package.json - the manifest file in which you declare your language support.
  • language-configuration.json - the language configuration used in the VS Code editor, defining the tokens that are used for comments and brackets.
  • src/extension.ts - the main code of the extension, which is responsible for launching a language server and client.
  • src/language-server/impromptu.langium - the grammar definition of your language.
  • src/language-server/main.ts - the entry point of the language server process.
  • src/language-server/impromptu-module.ts - the dependency injection module of your language implementation. Use this to register overridden and added services.
  • src/language-server/impromptu-validator.ts - an example validator. You should change it to reflect the semantics of your language.
  • src/cli/index.ts - the entry point of the command line interface (CLI) of your language.
  • src/cli/generator.ts - the code generator used by the CLI to write output files from DSL documents.
  • src/cli/cli-util.ts - utility code for the CLI.

Get up and running straight away

  • Run npm run langium:generate to generate TypeScript code from the grammar definition.
  • Run npm run build to compile all TypeScript code.
  • Press F5 to open a new window with your extension loaded.
  • Create a new file with a file name suffix matching your language.
  • Verify that syntax highlighting, validation, completion etc. are working as expected.
  • Run ./bin/cli to see options for the CLI; ./bin/cli generate <file> generates code for a given DSL file.

Make changes

  • Run npm run watch to have the TypeScript compiler run automatically after every change of the source files.
  • Run npm run langium:watch to have the Langium generator run automatically afer every change of the grammar declaration.
  • You can relaunch the extension from the debug toolbar after making changes to the files listed above.
  • You can also reload (Ctrl+R or Cmd+R on Mac) the VS Code window with your extension to load your changes.

Install your extension

  • To start using your extension with VS Code, copy it into the <user home>/.vscode/extensions folder and restart Code.
  • To share your extension with the world, read the VS Code documentation about publishing an extension.

To Go Further

Documentation about the Langium framework is available at https://langium.org