| public Advance ( int offset ) : void | ||
| offset | int | Offset to move by |
| return | void | |
// public static object CharacterSteam { get; private set; }
public static int HandleNumber(CharacterStream cs) {
int start = cs.Position;
if (cs.CurrentChar == '-' || cs.CurrentChar == '+') {
cs.MoveToNextChar();
}
if (cs.CurrentChar == '0' && cs.NextChar == 'x') {
cs.Advance(2);
return HandleHex(cs, start);
}
if (cs.CurrentChar == 'x' && CharacterStream.IsHex(cs.NextChar)) {
cs.MoveToNextChar();
return HandleHex(cs, start);
}
int integerPartStart = cs.Position;
int integerPartLength = 0;
int fractionPartLength = 0;
bool isDouble = false;
// collect decimals (there may be none like in .1e+20
while (cs.IsDecimal()) {
cs.MoveToNextChar();
integerPartLength++;
}
if (cs.CurrentChar == '.') {
isDouble = true;
// float/double
cs.MoveToNextChar();
// If we've seen don we need to collect factional part of any
while (cs.IsDecimal()) {
cs.MoveToNextChar();
fractionPartLength++;
}
}
if (integerPartLength + fractionPartLength == 0) {
return 0; // +e or +.e is not a number and neither is lonely + or -
}
int numberLength;
if (cs.CurrentChar == 'e' || cs.CurrentChar == 'E') {
isDouble = true;
numberLength = HandleExponent(cs, start);
} else {
numberLength = cs.Position - start;
}
// Verify double format
if (isDouble && !IsValidDouble(cs, start, cs.Position)) {
numberLength = 0;
}
if (numberLength > 0) {
// skip over trailing 'L' if any
if (cs.CurrentChar == 'L') {
cs.MoveToNextChar();
numberLength++;
}
}
return numberLength;
}