public Parser(int numSwitches)
{
_switches = new SwitchResult[numSwitches];
for (int i = 0; i < numSwitches; i++)
{
_switches[i] = new SwitchResult();
}
}
bool ParseString(string srcString, SwitchForm[] switchForms)
{
int len = srcString.Length;
if (len == 0)
{
return(false);
}
int pos = 0;
if (!IsItSwitchChar(srcString[pos]))
{
return(false);
}
while (pos < len)
{
if (IsItSwitchChar(srcString[pos]))
{
pos++;
}
const int kNoLen = -1;
int matchedSwitchIndex = 0;
int maxLen = kNoLen;
for (int switchIndex = 0; switchIndex < _switches.Length; switchIndex++)
{
int switchLen = switchForms[switchIndex].IDString.Length;
if (switchLen <= maxLen || pos + switchLen > len)
{
continue;
}
if (String.Compare(switchForms[switchIndex].IDString, 0,
srcString, pos, switchLen, true) == 0)
{
matchedSwitchIndex = switchIndex;
maxLen = switchLen;
}
}
if (maxLen == kNoLen)
{
throw new Exception("maxLen == kNoLen");
}
SwitchResult matchedSwitch = _switches[matchedSwitchIndex];
SwitchForm switchForm = switchForms[matchedSwitchIndex];
if ((!switchForm.Multi) && matchedSwitch.ThereIs)
{
throw new Exception("switch must be single");
}
matchedSwitch.ThereIs = true;
pos += maxLen;
int tailSize = len - pos;
SwitchType type = switchForm.Type;
switch (type)
{
case SwitchType.PostMinus:
{
if (tailSize == 0)
{
matchedSwitch.WithMinus = false;
}
else
{
matchedSwitch.WithMinus = (srcString[pos] == kSwitchMinus);
if (matchedSwitch.WithMinus)
{
pos++;
}
}
break;
}
case SwitchType.PostChar:
{
if (tailSize < switchForm.MinLen)
{
throw new Exception("switch is not full");
}
string charSet = switchForm.PostCharSet;
const int kEmptyCharValue = -1;
if (tailSize == 0)
{
matchedSwitch.PostCharIndex = kEmptyCharValue;
}
else
{
int index = charSet.IndexOf(srcString[pos]);
if (index < 0)
{
matchedSwitch.PostCharIndex = kEmptyCharValue;
}
else
{
matchedSwitch.PostCharIndex = index;
pos++;
}
}
break;
}
case SwitchType.LimitedPostString:
case SwitchType.UnLimitedPostString:
{
int minLen = switchForm.MinLen;
if (tailSize < minLen)
{
throw new Exception("switch is not full");
}
if (type == SwitchType.UnLimitedPostString)
{
matchedSwitch.PostStrings.Add(srcString.Substring(pos));
return(true);
}
String stringSwitch = srcString.Substring(pos, minLen);
pos += minLen;
for (int i = minLen; i < switchForm.MaxLen && pos < len; i++, pos++)
{
char c = srcString[pos];
if (IsItSwitchChar(c))
{
break;
}
stringSwitch += c;
}
matchedSwitch.PostStrings.Add(stringSwitch);
break;
}
}
}
return(true);
}
