Module registry 

Process-wide registry of HighlightConfigurations, keyed by language name. Owned via Arc so every Syntax instance holds a cheap clone and the injection callback in Highlighter::highlight can look up sibling configs (markdown block → markdown_inline; markdown’s fenced code blocks → rust / python / javascript / etc.) without each Syntax carrying its own copy.

Why an Arc registry instead of per-document configs

HighlightConfiguration::new does the expensive setup (compiling the highlights and injections queries against the language). Per- document copies would multiply that cost and inflate memory. The registry constructs each config once at startup; Syntax instances borrow refs through the shared Arc<LangRegistry>.

The injection callback that Highlighter::highlight takes returns Option<&'a HighlightConfiguration> where 'a is the highlighter’s borrow lifetime. Closing the callback over &self.registry lets the callback return refs that live for the highlight call.

Structs

GrammarSpec

Everything a runtime-registered language supplies beyond its identity.

LangRegistry

Catalog of every supported language’s parser + highlight + injection configuration. Construct once via Self::standard and share by Arc clone.

Functions

live

Snapshot the live registry.