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 ForLoopStaNode Parse(TokenString tStr, ref int index)
{
int startIndex = index;
if (!tStr.Match(index, TokenType.forStatement, TokenType.rBraceOpen))
{
return(null);
}
index++;
var forDef = tStr.GetRangeInBrackets(ref index).Split(false, TokenType.lineEnd);
if (forDef.Count != 3)
{
index = startIndex;
return(null);
}
VariableDefExpNode declarations = Exp.Parse(forDef[0]) as VariableDefExpNode;
ExpressionNode condition = Exp.Parse(forDef[1]);
if (condition == null)
{
index = startIndex;
return(null);
}
StatementNode body = Sta.Parse(tStr, ref index);
ForLoopStaNode node = new ForLoopStaNode(declarations, condition, body);
var exps = forDef[2].Split(false, TokenType.comma);
foreach (var exp in exps)
{
node.AddExpression(Exp.Parse(exp));
}
return(node);
}