JSON Embedded Languages

Syntax Highlighting for embedded languages within JSON and JSONC files.
It does so by overriding the default JSON and JSONC languages and assigning a scopeName to each object with the form .meta.embedded.objectkey..
Then using multiple injection grammars that target those scopeNames and inject specific languages into it.

Features

• ShellScript within "scripts" for package.json (JSON)
  

• when-clause-contexts within "when" for package.json and keybindings.json (JSON)
  

• JSON escaped JavaScript Regular Expressions within "wordPattern", "folding", "onEnterRules" and "indentationRules" for language-configuration.json (JSONC)
  

• Snippets, Regex and Markdown within "defaultSnippets", "pattern" and "markdownDescription" for .schema.json (JSON)
  Recommend the Snippets Snippets extension
  

• Glob patterns within "filenamePatterns" and "fileMatch" for package.json

Known Issues

This extension targets every JSON and JSONC file, not just package.json.
There will be false positives and false negatives.
Please report any issues you come across.

VSCode TextMate injections are rather slow.
It may take longer for documents to fully syntax highlight.
The "injectionSelector" for regexp is almost 10,000 characters long.

For more information

• The GitHub Issue that spawned the idea
• Github Repository
• VSCode Marketplace
• Related extensions:
  • Extended Embedded Languages
  • Injected Regex Syntax Highlighting
  • YAML Embedded Languages
  • Snippets Snippets

TODO:

• Support args
• Improve performance
• Fix false positives