createScanner method

@override Scanner createScanner(List<String> patterns)

Compiles patterns into a scanner that returns the leftmost match across all of them.

Implementation

@override
Scanner createScanner(List<String> patterns) {
  final compiled = [for (final p in patterns) _compile(p)];
  final scanner = _DartScanner(compiled);
  final combinable = compiled.every((p) => p.translated?.combinable ?? true);
  final small = patterns.fold(0, (n, p) => n + p.length) <= combineMaxSource;
  return supportsCombinedRegex &&
          combinePatterns &&
          combinable &&
          small &&
          compiled.length > 1
      ? _CombinedScanner(compiled, scanner)
      : scanner;
}