internal void ConsumeSubString(DTSubString sub) {
Contract.Assert(sub.index == Index, "sub.index == Index");
Contract.Assert(sub.index + sub.length <= len, "sub.index + sub.length <= len");
Index = sub.index + sub.length;
if (Index < len) {
m_current = Value[Index];
}
}
internal DTSubString GetSubString() {
DTSubString sub = new DTSubString();
sub.index = Index;
sub.s = Value;
while (Index + sub.length < len) {
DTSubStringType currentType;
Char ch = Value[Index + sub.length];
if (ch >= '0' && ch <= '9') {
currentType = DTSubStringType.Number;
}
else {
currentType = DTSubStringType.Other;
}
if (sub.length == 0) {
sub.type = currentType;
}
else {
if (sub.type != currentType) {
break;
}
}
sub.length++;
if (currentType == DTSubStringType.Number) {
// Incorporate the number into the value
// Limit the digits to prevent overflow
if (sub.length > DateTimeParse.MaxDateTimeNumberDigits) {
sub.type = DTSubStringType.Invalid;
return sub;
}
int number = ch - '0';
Contract.Assert(number >= 0 && number <= 9, "number >= 0 && number <= 9");
sub.value = sub.value * 10 + number;
}
else {
// For non numbers, just return this length 1 token. This should be expanded
// to more types of thing if this parsing approach is used for things other
// than numbers and single characters
break;
}
}
if (sub.length == 0) {
sub.type = DTSubStringType.End;
return sub;
}
return sub;
}
