Module engine 

Compile a Rule into a runnable matcher and run it against source.

The atomic tier supports three matcher forms, all reduced to a single RuleMatch stream:

• pattern → compiled to a tree-sitter query via crate::pattern.
• kind → the trivial query (<kind>) @__match.
• regex → a text regex over the source, yielding spans with no AST metavar bindings.

Structs

Binding

A metavariable binding: the captured text plus where it lives.

CompiledRule

A rule whose matcher has been compiled and is ready to run.

RuleMatch

One match of a rule against a file.

Span

A byte + row/col span. Rows/cols are 0-based, matching the rest of the Harn AST wire format.