private TimeSpan?LookForHourChar(TimeState state, bool beenHere = false)
{
while (true)
{
char c = _stream.ReadChar();
if (c == EOF)
{
return(beenHere && state.IsComplete ? state.ToTimeSpan() : null);
}
switch (c)
{
case '0':
case '1':
case '2':
if (beenHere)
{
state.Hour *= 10;
state.Hour += c - ZERO_CHAR;
return(LookForDelimiter(state));
}
else
{
state.Hour = c - ZERO_CHAR;
beenHere = true;
continue;
}
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (beenHere)
{
state.Hour *= 10;
state.Hour += c - ZERO_CHAR;
}
else
{
state.Hour = c - ZERO_CHAR;
}
return(LookForDelimiter(state));
case ' ':
case '\t':
case '\r':
case '\n':
beenHere = false;
continue;
default:
return(null);
}
}
}
private static TimeSpan?Finish(TimeState state)
{
return(state.IsComplete ? state.ToTimeSpan() : null);
}
private TimeSpan?LookForMinuteChar(TimeState state, bool beenHere = false)
{
while (true)
{
char c = _stream.ReadChar();
if (c == EOF)
{
return(beenHere && state.IsComplete ? state.ToTimeSpan() : null);
}
switch (c)
{
case 'a':
case 'A':
case 'p':
case 'P':
_stream.Backup(1);
return(LookForAmPm(state));
case ' ':
case '\t':
case '\r':
case '\n':
beenHere = false;
continue;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
if (beenHere)
{
state.Minute *= 10;
state.Minute += c - ZERO_CHAR;
return(LookForAmPm(state));
}
else
{
state.Minute = c - ZERO_CHAR;
beenHere = true;
continue;
}
case '6':
case '7':
case '8':
case '9':
if (!beenHere)
{
return(null); // minutes can't start with 6-9
}
state.Minute *= 10;
state.Minute += c - ZERO_CHAR;
return(LookForAmPm(state));
default:
return(null); // invalid character
}
}
}
private TimeSpan? LookForMinuteChar(TimeState state, bool beenHere = false)
{
while (true)
{
char c = _stream.ReadChar();
if (c == EOF)
return beenHere && state.IsComplete ? state.ToTimeSpan() : null;
switch (c)
{
case 'a':
case 'A':
case 'p':
case 'P':
_stream.Backup(1);
return LookForAmPm(state);
case ' ':
case '\t':
case '\r':
case '\n':
beenHere = false;
continue;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
if (beenHere)
{
state.Minute *= 10;
state.Minute += c - ZERO_CHAR;
return LookForAmPm(state);
}
else
{
state.Minute = c - ZERO_CHAR;
beenHere = true;
continue;
}
case '6':
case '7':
case '8':
case '9':
if (!beenHere)
return null; // minutes can't start with 6-9
state.Minute *= 10;
state.Minute += c - ZERO_CHAR;
return LookForAmPm(state);
default:
return null; // invalid character
}
}
}
private TimeSpan? LookForHourChar(TimeState state, bool beenHere = false)
{
while (true)
{
char c = _stream.ReadChar();
if (c == EOF)
return beenHere && state.IsComplete ? state.ToTimeSpan() : null;
switch (c)
{
case '0':
case '1':
case '2':
if (beenHere)
{
state.Hour *= 10;
state.Hour += c - ZERO_CHAR;
return LookForDelimiter(state);
}
else
{
state.Hour = c - ZERO_CHAR;
beenHere = true;
continue;
}
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (beenHere)
{
state.Hour *= 10;
state.Hour += c - ZERO_CHAR;
}
else
state.Hour = c - ZERO_CHAR;
return LookForDelimiter(state);
case ' ':
case '\t':
case '\r':
case '\n':
beenHere = false;
continue;
default:
return null;
}
}
}
private static TimeSpan? Finish(TimeState state)
{
return state.IsComplete ? state.ToTimeSpan() : null;
}
private TimeSpan? LookForHourChar(TimeState state, bool beenHere = false)
{
char c = stream.ReadChar();
if (c == EOF)
return beenHere && state.IsComplete ? state.ToTimeSpan() : null;
switch (c)
{
case '0':
case '1':
case '2':
if (beenHere)
{
state.Hour *= 10;
state.Hour += ((int)c) - zeroChar;
return LookForDelimiter(state);
}
else
{
state.Hour = ((int)c) - zeroChar;
return LookForHourChar(state, true);
}
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (beenHere)
{
state.Hour *= 10;
state.Hour += ((int)c) - zeroChar;
}
else
state.Hour = ((int)c) - zeroChar;
return LookForDelimiter(state);
case ' ':
case '\t':
case '\r':
case '\n':
return LookForHourChar(state, false);
default:
return null;
}
}