pub fn import_ebnf(text: &str) -> Result<Grammar, GrammarImportError>Expand description
Parses Extended Backus-Naur Form text into the grammar IR.
The parser accepts the ISO-style name = expression ; spelling used by the
issue fixtures and the ::= spelling. Concatenation (, or juxtaposition)
binds tighter than alternation (|); ( ), [ ], and { } group,
make optional, and repeat; a postfix ?, *, or + follows an element.
ISO (* ... *) comments outside string literals are skipped, as in the
JavaScript importer.
ยงErrors
Returns GrammarImportError when the EBNF text cannot be parsed, when a
parsed construct cannot be represented, or when a non-terminal reference does
not resolve to a rule in the imported grammar.