public static StatementNode Parse(TokenString tStr, ref int index)
{
switch (tStr[index].Type)
{
case TokenType.cBraceOpen:
return(CompoundStaNode.Parse(tStr, ref index));
case TokenType.ifStatement:
return(ConditionalStaNode.Parse(tStr, ref index));
case TokenType.doStatement:
return(DoLoopStaNode.Parse(tStr, ref index));
case TokenType.whileStatement:
return(WhileLoopStaNode.Parse(tStr, ref index));
case TokenType.forStatement:
return(ForLoopStaNode.Parse(tStr, ref index));
case TokenType.returnStatement:
return(ReturnStaNode.Parse(tStr, ref index));
case TokenType.lineEnd:
return(NopStaNode.Parse(tStr, ref index));
default:
return(ExpressionStaNode.Parse(tStr, ref index));
}
}
public static ConditionalStaNode Parse(TokenString tStr, ref int index)
{
int startIndex = index;
if (!tStr.Match(index, TokenType.ifStatement, TokenType.rBraceOpen))
{
return(null);
}
index++;
ExpressionNode condition = Exp.Parse(tStr.GetRangeInBrackets(ref index));
StatementNode ifTrue = Sta.Parse(tStr, ref index);
StatementNode ifFalse = null;
if (tStr.Match(index, TokenType.elseStatement))
{
index++;
ifFalse = Sta.Parse(tStr, ref index);
}
ConditionalStaNode node = new ConditionalStaNode(condition, ifTrue, ifFalse);
return(node);
}