directiveUris function

List<String> directiveUris(List<String> lines)

Every import, export and part URI in lines, in source order.

Shares the sorter's scanner, so a directive inside a /* */ block or a string literal is text here too — the import graph should not grow an edge from code that was commented out.

part counts: a part file is never imported, only parted, and leaving the directive out would make every generated .g.dart look unreferenced.

Implementation

List<String> directiveUris(List<String> lines) {
  final uris = <String>[];
  final scanner = _SourceScanner();

  var index = 0;
  while (index < lines.length) {
    final line = lines[index];
    if (scanner.startsInCode) {
      var start = index;
      while (start < lines.length && _isIgnorePragma(lines[start])) {
        start++;
      }
      if (start < lines.length && _opensDirective(lines[start])) {
        final span = _scanDirective(lines, start);
        if (span > 0) {
          final targets = _directiveTargets(lines.sublist(start, start + span));
          if (targets.isNotEmpty) {
            uris.addAll(targets);
            for (var i = index; i < start + span; i++) {
              scanner.consume(lines[i]);
            }
            index = start + span;
            continue;
          }
        }
      }
    }
    scanner.consume(line);
    index++;
  }
  return uris;
}