parseKeyword function

Token? parseKeyword(
  1. String input,
  2. int index,
  3. int line,
  4. int column,
)

Implementation

Token? parseKeyword(String input, int index, int line, int column) {
  final entries = keywordTokensMap.entries;
  for (int i = 0; i < entries.length; i++) {
    final entry = entries.elementAt(i);
    final keyLen = entry.key.length;
    final nextLen = index + keyLen;
    final lastIndex = nextLen > input.length ? input.length : nextLen;
    if (safeSubstring(input, index, lastIndex) == entry.key) {
      return new Token(
          entry.value, line, column + keyLen, lastIndex, entry.key);
    }
  }

  return null;
}