Vendored lexer definitions

XML lexer definitions copied verbatim from chroma v2.23.1 (lexers/embedded/), MIT licensed — see LICENSE in this directory (chroma's COPYING, copyright Alec Thomas). Chroma's grammars are in turn largely ports of Pygments lexer definitions (BSD-2-Clause).

Only a hand-picked set of common languages is vendored here. Importing chroma's own lexers package instead would embed all 268 language definitions (several MB of binary weight); these files plus chroma's core engine cost well under 1MB. The Go lexer is not XML-based upstream and is instead ported as Go code in ../highlight.go.

Because the files are unmodified and chroma is still a regular go.mod dependency, each file can be diffed against the same path in the module cache (github.com/alecthomas/chroma/[email protected]/lexers/embedded/) to verify provenance or to refresh a grammar.