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Parsing

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- Implemented Nibbler::getUnsignedNumber.
This commit is contained in:
Paul Beckingham 2011-09-11 00:47:54 -04:00
parent 22e9d84074
commit 966501f5da
2 changed files with 71 additions and 2 deletions
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72
src/Nibbler.cpp
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@ -365,7 +365,7 @@ bool Nibbler::getUnsignedInt (int& result)
// int frac? exp?
//
// int:
// -? digit+
// (-|+)? digit+
//
// frac:
// . digit+
@ -381,7 +381,7 @@ bool Nibbler::getNumber (double& result)
std::string::size_type i = _cursor;
// [+-]?
if (i < _length && _input[i] == '-')
if (i < _length && (_input[i] == '-' || _input[i] == '+'))
++i;
// digit+
@ -432,6 +432,74 @@ bool Nibbler::getNumber (double& result)
return false;
}
////////////////////////////////////////////////////////////////////////////////
// number:
// int frac? exp?
//
// int:
// digit+
//
// frac:
// . digit+
//
// exp:
// e digit+
//
// e:
// e|E (+|-)?
//
bool Nibbler::getUnsignedNumber (double& result)
{
std::string::size_type i = _cursor;
// digit+
if (i < _length && isdigit (_input[i]))
{
++i;
while (i < _length && isdigit (_input[i]))
++i;
// ( . digit+ )?
if (i < _length && _input[i] == '.')
{
++i;
while (i < _length && isdigit (_input[i]))
++i;
}
// ( [eE] [+-]? digit+ )?
if (i < _length && (_input[i] == 'e' || _input[i] == 'E'))
{
++i;
if (i < _length && (_input[i] == '+' || _input[i] == '-'))
++i;
if (i < _length && isdigit (_input[i]))
{
++i;
while (i < _length && isdigit (_input[i]))
++i;
result = strtof (_input.substr (_cursor, i - _cursor).c_str (), NULL);
_cursor = i;
return true;
}
return false;
}
result = strtof (_input.substr (_cursor, i - _cursor).c_str (), NULL);
_cursor = i;
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
bool Nibbler::getLiteral (const std::string& literal)
{