pub fn import_pest(text: &str) -> Result<Grammar, GrammarImportError>Expand description
Parses PEG .pest grammar text into the grammar IR.
Rules are name = modifier? { expression } with the modifiers _
(silent), @ (atomic), $ (token), and ! (normal). Expressions use
ordered choice |, sequence ~, the predicates & and !, the postfix
operators ?, *, +, and counted repetition {n}, {n,}, {,m},
{n,m}, over strings, ^"…" case-insensitive strings, 'a'..'z' ranges,
and rule references, where ANY matches any character. // and /* */
comments are skipped.
§Errors
Returns GrammarImportError when the pest grammar cannot be parsed, when
a parsed construct (such as PUSH(…) or PEEK[…]) cannot be represented
in the grammar IR, or when a non-terminal reference does not resolve to a
local rule or pest built-in.