feat: highlight embedded languages via injection - #88
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Add an opt-in `inject` keyword to `highlight`. With `inject=true`, code embedded in the source is highlighted by its own grammar: the JavaScript and CSS inside an HTML document, command literals in Julia. Each injection layer is highlighted with its own queries, and the tokens merge into one stream where the shorter span wins on overlap. Default output is byte-identical and loads no embedded grammars, so existing callers are unaffected. Colour the capture names markup and CSS grammars emit that previously fell through to the plain foreground and rendered as unstyled text: `tag` and `tag.error` for HTML tag names, `property` for CSS property names and selectors. Colouring `property` also colours object member access in languages that capture it. Injection needs the layered `parse` from TreeSitter.jl.
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Add an opt-in
injectkeyword tohighlight. Withinject=true, code embedded in the source is highlighted by its own grammar: the JavaScript and CSS inside an HTML document, command literals in Julia. Each injection layer is highlighted with its own queries, and the tokens merge into one stream where the shorter span wins on overlap. Default output is byte-identical and loads no embedded grammars, so existing callers are unaffected.Colour the capture names markup and CSS grammars emit that previously fell through to the plain foreground and rendered as unstyled text:
tagandtag.errorfor HTML tag names,propertyfor CSS property names and selectors. Colouringpropertyalso colours object member access in languages that capture it.Depends on MichaelHatherly/TreeSitter.jl#60, which adds the layered
parsethis builds on. CI here stays red until that merges and a TreeSitter release ships the injection API; theTreeSittercompat bound then needs bumping to that version.