startMatch method

List<XHMatchInfo> startMatch(String target)

Implementation

List<XHMatchInfo> startMatch(String target) {
  StringScanner scanner = StringScanner(target);

  List<XHHighlightMatch> rules = _toMatchMap.values.toList();
  List<int> types = _toMatchMap.keys.toList();
  List<XHMatchInfo> tmpMatchList = [];

  while (!scanner.isDone) {
    bool hasMatch = false;
    for (int i = 0; i < rules.length; i++) {
      if (scanner.scan(rules[i].matchReg()!)) {
        Match? match = scanner.lastMatch;
        if (match != null) {
          tmpMatchList.add(XHMatchInfo(
            matchType: types[i],
            start: match.start,
            end: match.end,
            value: match.group(0) ?? '',
          ));
        }
        hasMatch = true;
        break;
      }
    }
    if (scanner.isDone) break;
    if (!hasMatch) scanner.position++;
  }

  List<XHMatchInfo> allMatchList = [];
  int cursor = 0;
  if (tmpMatchList.isEmpty) {
    return [
      XHMatchInfo(
          matchType: unMatch.matchType,
          start: cursor,
          end: target.length,
          value: target.substring(cursor))
    ];
  }

  for (int i = 0; i < tmpMatchList.length; i++) {
    XHMatchInfo match = tmpMatchList[i];
    if (cursor != match.start) {
      allMatchList.add(XHMatchInfo(
          matchType: unMatch.matchType,
          start: cursor,
          end: match.start,
          value: target.substring(cursor, match.start)));
    }
    allMatchList.add(match);
    cursor = match.end;
  }
  if (cursor != target.length) {
    allMatchList.add(XHMatchInfo(
        matchType: unMatch.matchType,
        start: cursor,
        end: target.length,
        value: target.substring(cursor)));
  }
  return allMatchList;
}