resolveTextDecorationLine static method

Implementation

static TextDecoration resolveTextDecorationLine(String present) {
  if (present.isEmpty) return TextDecoration.none;
  final parts = present.trim().split(RegExp(r"\s+"));
  // If 'none' is present with any other token, treat as none.
  if (parts.contains('none')) return TextDecoration.none;

  final List<TextDecoration> lines = [];
  for (final p in parts) {
    switch (p) {
      case 'line-through':
        if (!lines.contains(TextDecoration.lineThrough)) lines.add(TextDecoration.lineThrough);
        break;
      case 'overline':
        if (!lines.contains(TextDecoration.overline)) lines.add(TextDecoration.overline);
        break;
      case 'underline':
        if (!lines.contains(TextDecoration.underline)) lines.add(TextDecoration.underline);
        break;
      // Ignore unknown tokens; they make the longhand invalid in strict CSS,
      // but our resolver defaults to none if nothing valid is found.
      default:
        break;
    }
  }

  if (lines.isEmpty) return TextDecoration.none;
  if (lines.length == 1) return lines.first;
  return TextDecoration.combine(lines);
}