build method

@override String build(Context context, ParserResult? result)

Implementation

@override
String build(Context context, ParserResult? result) {
  if (table.isEmpty) {
    throw ArgumentError.value(
        table, 'table', 'The map of tags must not be empty: $this');
  }

  if (errors.length != table.length) {
    throw ArgumentError.value(table, 'tags',
        'The length of the error list (${errors.length}) does not match the tag table.: ${table.keys.join(', ')}');
  }

  context.refersToStateSource = true;
  final values = context.allocateLocals(['pos']);
  final pos = values['pos']!;
  final map = <int, List<String>>{};
  for (final tag in table.keys) {
    if (tag == null) {
      continue;
    }

    if (tag.isEmpty) {
      throw ArgumentError.value(table, 'table',
          'The map of tags must not contain empty tags: ${table.keys.join(', ')}');
    }

    final c = tag.codeUnitAt(0);
    var list = map[c];
    if (list == null) {
      list = [];
      map[c] = list;
    }

    list.add(tag);
  }

  final branches = <String, String>{};
  for (final c in map.keys) {
    final tags = map[c]!;
    tags.sort((x, y) => y.length.compareTo(x.length));
    final tests = <String, String>{};
    for (final tag in tags) {
      final escaped = helper.escapeString(tag);
      final parser = table[tag]!;
      final isLong = tag.length > 1;
      final branch = parser.build(context, result);
      final condition = isLong ? 'source.startsWith($escaped, $pos)' : '';
      tests[condition] = branch;
    }

    final branch = helper.buildConditional(tests);
    branches['c == $c'] = branch;
  }

  if (table.containsKey(null)) {
    final parser = table[null]!;
    final branch = parser.build(context, result);
    branches[''] = branch;
  }

  values.addAll({
    'errors':
        List.generate(errors.length, (i) => errors[i].build(context, null))
            .join('\n'),
    'tests': helper.buildConditional(branches),
    'type': getResultType(),
  });
  return render(_template, values, [result]);
}