HTML language service extracted from VSCode to be reused, e.g in the Monaco editor.

The vscode-html-languageservice contains the language smarts behind the HTML editing experience of Visual Studio Code and the Monaco editor.

• doComplete / doComplete2 (async) provide completion proposals for a given location.

• setCompletionParticipants allows participant to provide suggestions for specific tokens.

• doHover provides hover information at a given location.

• format formats the code at the given range.

• findDocumentLinks finds all links in the document.

• findDocumentSymbols finds all the symbols in the document.

• getFoldingRanges return folding ranges for the given document.

• getSelectionRanges return the selection ranges for the given document. ...

For the complete API see htmlLanguageService.ts and htmlLanguageTypes.ts

The vscode-html-languageservice does not cover syntax highlighting. VS Code uses TextMate grammars for that, with a grammar that is maintained in https://github.com/textmate/html.tmbundle.

All HTML entities (elements, properties, etc) are sourced from https://github.com/microsoft/vscode-custom-data/tree/master/web-data and transpiled here. For adding or fixing existing properties' completion/hover description, please open PR there.

npm install --save vscode-html-languageservice

• clone this repo, run npm i
• npm test to compile and run tests

How can I run and debug the service?

• open the folder in VSCode.
• set breakpoints, e.g. in htmlCompletion.ts
• run the Unit tests from the run viewlet and wait until a breakpoint is hit:

How can I run and debug the service inside an instance of VSCode?

• run VSCode out of sources setup as described here: https://github.com/Microsoft/vscode/wiki/How-to-Contribute
• link the folder of the vscode-html-languageservice repo to vscode/extensions/html-language-features/server to run VSCode with the latest changes from that folder:
  • cd vscode-html-languageservice, npm link
  • cd vscode/extensions/html-language-features/server, npm link vscode-html-languageservice
• run VSCode out of source (vscode/scripts/code.sh|bat) and open a .html file
• in VSCode window that is open on the vscode-html-languageservice sources, run command Debug: Attach to Node process and pick the code-oss process with the html-language-features path
• set breakpoints, e.g. in htmlCompletion.ts
• in the instance run from sources, invoke code completion in the .html file

(MIT License)

Copyright 2016-2023, Microsoft

src/languageFacts/data/webCustomData.ts (shipped as lib/esm/languageFacts/data/webCustomData.ts and lib/umd/languageFacts/data/webCustomData.ts) are built upon content from Mozilla Developer Network and distributed under CC BY-SA 2.5.