public ActionExpression(string toParse, int index)
{
type = ExpressionType.DoNothing;
next = null;
ActionsReader.State s = ActionsReader.State.Start;
StringBuilder sb = new StringBuilder();
for (int i = index; i < toParse.Length; i++)
{
s = ActionsReader.NextState(s, toParse[i]);
switch (s)
{
case ActionsReader.State.ReadPrint:
type = ExpressionType.Print;
next = new ActionExpression(toParse, i + 1);
goto loopEnd;
case ActionsReader.State.ReadSet:
type = ExpressionType.Set;
break;
case ActionsReader.State.ReadLet:
type = ExpressionType.Let;
break;
case ActionsReader.State.ReadingFieldName:
case ActionsReader.State.ReadingFieldValue:
case ActionsReader.State.ReadingVarName:
case ActionsReader.State.ReadingVarValue:
sb.Append(toParse[i]);
break;
case ActionsReader.State.ReadFieldName:
case ActionsReader.State.ReadVarName:
fieldName = sb.ToString();
sb = new StringBuilder();
break;
case ActionsReader.State.ReadFieldValue:
case ActionsReader.State.ReadVarValue:
fieldValue = sb.ToString();
next = new ActionExpression(toParse, i + 1);
goto loopEnd;
}
}
loopEnd :;
}
public Program(string programSource)
{
string queryString = "", tAction = "", fAction = "";
ProgramReader.State s = ProgramReader.State.Start;
StringBuilder sb = null;
foreach (char c in programSource)
{
s = ProgramReader.NextState(s, c);
switch (s)
{
case ProgramReader.State.StartQueryRead:
case ProgramReader.State.StartTActionRead:
case ProgramReader.State.StartFActionRead:
sb = new StringBuilder();
break;
case ProgramReader.State.ReadingQuery:
case ProgramReader.State.ReadingTAction:
case ProgramReader.State.ReadingFAction:
sb.Append(c);
break;
case ProgramReader.State.ReadQuery:
queryString = sb.ToString();
break;
case ProgramReader.State.ReadTAction:
tAction = sb.ToString();
break;
case ProgramReader.State.ReadFAction:
fAction = sb.ToString();
break;
case ProgramReader.State.InvalidSyntax:
throw new Exception("Invalid Syntax!");
}
}
query = new Expression(queryString.Trim());
trueAction = new ActionExpression(tAction.Trim(), 0);
falseAction = new ActionExpression(fAction.Trim(), 0);
}