public IEnumerable <RawMultiplier> Iterator()
{
RawMultiplier output = null;
foreach (char c in this.rawExpression.rawString)
{
switch (this.state)
{
case ParseStates.Start:
this.HandleStart(c);
break;
case ParseStates.WaitSymbols:
this.HandleWaitSymbols(c);
break;
case ParseStates.WaitOperand:
output = this.HandleWaitOperand(c);
break;
case ParseStates.EscapeSymbols:
this.HandleEscapeSymbols(c);
break;
}
if (output != null)
{
yield return(output);
output = null;
}
this.index++;
this.globalIndex++;
}
yield return(this.Finalize());
this.reset();
}
private RawMultiplier HandleWaitOperand(char c)
{
if (c == '+' || c == '-')
{
string rawBlockString = this.rawExpression
.rawString.Substring(this.blockOffset, index - this.blockOffset);
RawMultiplier output = new RawMultiplier(this.blockOffset, rawBlockString, this.coeff);
// define coefficent
this.coeff = (c == '-') ? -1 : 1;
this.state = ParseStates.WaitSymbols;
return(output);
}
else
{
if (c == '(')
{
this.state = ParseStates.EscapeSymbols;
}
}
return(null);
}
public RawMultiplierParser(RawMultiplier rawMultiplier)
{
this.rawMultiplier = rawMultiplier;
}
public void Parse(RawMultiplier rawMultiplier)
{
RawMultiplierParser parser = new RawMultiplierParser(rawMultiplier);
this.expressions = parser.Parse();
}
public Multiplier(RawMultiplier rawMultiplier)
{
this.rawMultiplier = rawMultiplier;
this.coeff = rawMultiplier.coeff;
this.Parse(rawMultiplier);
}