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Lexer: Do not allow leading zero for two and more digit integers

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This commit is contained in:
Tomas Babej
2021-01-24 01:29:34 -05:00
parent 6a33bb8656
commit 05e7c2aff2
1 changed files with 9 additions and 1 deletions
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10
src/Lexer.cpp
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@@ -687,17 +687,25 @@ bool Lexer::isNumber (std::string& token, Lexer::Type& type)
////////////////////////////////////////////////////////////////////////////////
// Lexer::Type::number
// \d+
// 0
// [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;