static double getFraction(CSSTokenizerInputStream& input, unsigned& offset)
{
if (input.peek(offset) != '.' || !isASCIIDigit(input.peek(offset + 1)))
return 0;
unsigned startOffset = offset;
offset = input.skipWhilePredicate<isASCIIDigit>(offset + 1);
return input.getDouble(startOffset, offset);
}
static int getSign(CSSTokenizerInputStream& input, unsigned& offset)
{
int sign = 1;
if (input.nextInputChar() == '+') {
++offset;
} else if (input.peek(offset) == '-') {
sign = -1;
++offset;
}
return sign;
}
static double getExponent(CSSTokenizerInputStream& input, unsigned& offset, int& sign)
{
unsigned exponentStartPos = 0;
unsigned exponentEndPos = 0;
if ((input.peek(offset) == 'E' || input.peek(offset) == 'e')) {
int offsetBeforeExponent = offset;
++offset;
if (input.peek(offset) == '+') {
++offset;
} else if (input.peek(offset) =='-') {
sign = -1;
++offset;
}
exponentStartPos = offset;
offset = input.skipWhilePredicate<isASCIIDigit>(offset);
exponentEndPos = offset;
if (exponentEndPos == exponentStartPos)
offset = offsetBeforeExponent;
}
return input.getDouble(exponentStartPos, exponentEndPos);
}