pub fn emit_peggy(
grammar: &Grammar,
) -> Result<(String, EmitReport), GrammarEmitError>Expand description
Emits Peggy PEG grammar text from the grammar IR.
Peggy maps directly to the IR’s PEG-oriented expression algebra: ordered
choice uses /, sequences are whitespace-separated, predicates use & and
!, labels use label:expr, and counted repetitions use Peggy’s
expr|min..max| form.
§Errors
Returns GrammarEmitError when the IR contains an internal invariant that
cannot form valid Peggy text, such as an empty choice, an empty character
class, a descending character range, or counted repetition with max < min.