findEndOfString method

String? findEndOfString(StringSearcher end, bool hasPrefixR, Position endPosition)

Finds the end of a single line string constant. end specifies the string end (" or '). If hasPrefixR the string constant is a "raw string" that means meta chars take not place there. endPosition: OUT the position behind the end delimiter. Returns null on success, otherwise the error message.

Implementation

String? findEndOfString(
    StringSearcher end, bool hasPrefixR, Position endPosition) {
  int? ix;
  String? rc;
  final line = engine.lineByIndex(engine.currentPosition.line);
  var col = engine.startColumnByIndex(engine.currentPosition.line);
  col = engine.currentPosition.column > col
      ? engine.currentPosition.column
      : col;
  endPosition.clone(engine.currentPosition);
  if (hasPrefixR) {
    ix = end.next(line, col);
    if (ix == null) {
      rc = 'missing end of string (${end.toSearch}) in line: $line';
    } else {
      endPosition.column = ix + 1;
      endPosition.normalize();
    }
  } else {
    int? ix;
    while (true) {
      var found = false;
      if ((ix = noMetaChar.next(line, col)) != null && ix == col) {
        col = endPosition.column = ix! + engine.lastMatch.length();
        found = true;
      }
      if (engine.containsAt(endPosition, backslash)) {
        col = endPosition.column += 2;
        found = true;
      }
      if (engine.containsAt(endPosition, end)) {
        endPosition.column += end.toSearch.length;
        endPosition.normalize();
        break;
      }
      if (!found) {
        rc = 'missing end of string (${end.toSearch}) in line: $line';
        break;
      }
    }
  }
  return rc;
}