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Lexer: Improved the recognition in ::isSet

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This commit is contained in:
Paul Beckingham 2015-08-04 17:41:19 -04:00
parent 6e710bf9b5
commit f7ab55abeb
1 changed files with 31 additions and 34 deletions
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65
src/Lexer.cpp
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@ -771,58 +771,55 @@ bool Lexer::isPair (std::string& token, Lexer::Type& type)
// Lexer::Type::set
// a single number: 1
// a list of numbers: 1,3,5
// a list of numbers: 1 3 5
// a range: 5-10
// or a combination: 1,3,5-10 12
// or a combination: 1,3,5-10
//
// <id> [ - <id> ] [ , <id> [ - <id> ] ] ...
bool Lexer::isSet (std::string& token, Lexer::Type& type)
{
std::size_t marker = _cursor;
bool moreThanJustANumber = false;
int count = 0;
std::string dummyToken;
Lexer::Type dummyType;
if (isDigit (_text[marker]))
do
{
++marker;
while (isDigit (_text[marker]))
utf8_next_char (_text, marker);
if (_text[marker] == '-')
if (isInteger (dummyToken, dummyType))
{
++marker;
while (isDigit (_text[marker]))
++count;
if (isLiteral ("-", false, false))
{
utf8_next_char (_text, marker);
moreThanJustANumber = true;
if (isInteger (dummyToken, dummyType))
++count;
else
{
_cursor = marker;
return false;
}
}
}
while (_text[marker] == ',')
else
{
++marker;
while (isDigit (_text[marker]))
utf8_next_char (_text, marker);
moreThanJustANumber = true;
if (_text[marker] == '-')
{
++marker;
while (isDigit (_text[marker]))
utf8_next_char (_text, marker);
}
}
if (moreThanJustANumber)
{
token = _text.substr (_cursor, marker - _cursor);
type = Lexer::Type::set;
_cursor = marker;
return true;
return false;
}
}
while (isLiteral (",", false, false));
// Success is multiple numbers, matching the pattern.
if (count > 1 &&
(isEOS () ||
isWhitespace (_text[_cursor]) ||
isHardBoundary (_text[_cursor], _text[_cursor + 1])))
{
token = _text.substr (marker, _cursor - marker);
type = Lexer::Type::set;
return true;
}
_cursor = marker;
return false;
}
////////////////////////////////////////////////////////////////////////////////