Method isInteger

src/Lexer.cpp:567–586

/////////////////////////////////////////////////////////////////////////// Lexer::Type::number 0 [1-9]\d Integers do not start with a leading 0, unless they are zero.

//   [1-9]\d*
//   Integers do not start with a leading 0, unless they are zero.
bool Lexer::isInteger(std::string& token, Lexer::Type& type) {
  std::size_t marker = _cursor;

  bool leading_zero = (_text[marker] == '0');

  if (unicodeLatinDigit(_text[marker])) {
    ++marker;
    while (unicodeLatinDigit(_text[marker])) utf8_next_char(_text, marker);

    // Leading zero is only allowed in the case of number 0
    if (leading_zero and marker - _cursor > 1) return false;

    token = _text.substr(_cursor, marker - _cursor);
    type = Lexer::Type::number;
    _cursor = marker;
    return true;
  }

  return false;
}

////////////////////////////////////////////////////////////////////////////////
// Lexer::Type::separator