| public static IsHexDigit ( Char ch ) : System.Boolean | ||
| ch | Char | |
| return | System.Boolean | |
// ReadChar : Char -> ()
// =====================
// Implementation of the FSA
//
public override void ReadChar(Char ch)
{
this._scanned = this._scanned + ch;
switch (this._state)
{
case State.END:
case State.ERROR:
this._state = State.ERROR;
break;
case State.START:
if (IsChar(ch))
{
this._state = State.C;
}
else if (ch == '\\')
{
this._state = State.S;
}
else
{
this._state = State.ERROR;
}
break;
case State.C:
this._state = State.END;
break;
case State.S:
if (Utils.IsEscapeChar(ch))
{
this._state = State.C;
}
else if (Utils.IsOctDigit(ch))
{
this._state = State.SO;
}
else if (ch == 'x' || ch == 'X')
{
this._state = State.SX;
}
else
{
this._state = State.ERROR;
}
break;
case State.SX:
if (Utils.IsHexDigit(ch))
{
this._state = State.SXH;
}
else
{
this._state = State.ERROR;
}
break;
case State.SXH:
if (Utils.IsHexDigit(ch))
{
this._state = State.SXHH;
}
else
{
this._state = State.END;
}
break;
case State.SXHH:
this._state = State.END;
break;
case State.SO:
if (Utils.IsOctDigit(ch))
{
this._state = State.SOO;
}
else
{
this._state = State.END;
}
break;
case State.SOO:
if (Utils.IsOctDigit(ch))
{
this._state = State.SOOO;
}
else
{
this._state = State.END;
}
break;
case State.SOOO:
this._state = State.END;
break;
default:
this._state = State.ERROR;
break;
}
}
public override void ReadChar(Char ch)
{
this._raw += ch;
switch (this._state)
{
case State.ERROR:
case State.END:
this._state = State.ERROR;
break;
case State.START:
if (ch == '0')
{
this._state = State.Z;
}
else if (Char.IsDigit(ch))
{
this._state = State.D;
this._val += ch - '0';
}
else
{
this._state = State.ERROR;
}
break;
case State.Z:
if (ch == 'x' || ch == 'X')
{
this._state = State.ZX;
}
else if (Utils.IsOctDigit(ch))
{
this._val *= 8;
this._val += ch - '0';
this._state = State.O;
}
else if (ch == 'u' || ch == 'U')
{
this._suffix = TokenInt.IntSuffix.U;
this._state = State.U;
}
else if (ch == 'l' || ch == 'L')
{
this._suffix = TokenInt.IntSuffix.L;
this._state = State.L;
}
else
{
this._state = State.END;
}
break;
case State.D:
if (Char.IsDigit(ch))
{
this._val *= 10;
this._val += ch - '0';
this._state = State.D;
}
else if (ch == 'u' || ch == 'U')
{
this._suffix = TokenInt.IntSuffix.U;
this._state = State.U;
}
else if (ch == 'l' || ch == 'L')
{
this._suffix = TokenInt.IntSuffix.L;
this._state = State.L;
}
else
{
this._state = State.END;
}
break;
case State.ZX:
if (Utils.IsHexDigit(ch))
{
this._val *= 0x10;
this._val += Utils.GetHexDigit(ch);
this._state = State.H;
}
else
{
this._state = State.ERROR;
}
break;
case State.O:
if (Utils.IsOctDigit(ch))
{
this._val *= 8;
this._val += ch - '0';
this._state = State.O;
}
else if (ch == 'u' || ch == 'U')
{
this._suffix = TokenInt.IntSuffix.U;
this._state = State.U;
}
else if (ch == 'l' || ch == 'L')
{
this._suffix = TokenInt.IntSuffix.L;
this._state = State.L;
}
else
{
this._state = State.END;
}
break;
case State.L:
if (ch == 'u' || ch == 'U')
{
this._suffix = TokenInt.IntSuffix.UL;
this._state = State.UL;
}
else
{
this._state = State.END;
}
break;
case State.H:
if (Utils.IsHexDigit(ch))
{
this._val *= 0x10;
this._val += Utils.GetHexDigit(ch);
this._state = State.H;
}
else if (ch == 'u' || ch == 'U')
{
this._suffix = TokenInt.IntSuffix.U;
this._state = State.U;
}
else if (ch == 'l' || ch == 'L')
{
this._suffix = TokenInt.IntSuffix.L;
this._state = State.L;
}
else
{
this._state = State.END;
}
break;
case State.U:
if (ch == 'l' || ch == 'L')
{
this._suffix = TokenInt.IntSuffix.UL;
this._state = State.UL;
}
else
{
this._state = State.END;
}
break;
case State.UL:
this._state = State.END;
break;
default:
this._state = State.ERROR;
break;
}
}
