public TreeNode BuildParseTree()
{
TreeNode parseTree = new TreeNode();
foreach (IToken token in InAList)
{
switch (token.Type)
{
case TokenType.keyword:
if (!parseTree.AppendKeyword(token.TokenString))
{
return(null);
}
break;
case TokenType.number:
parseTree.AppendNumber((NumberToken)token);
break;
case TokenType.infixOperator:
parseTree.AppendFunction(token);
break;
case TokenType.suffixOperator:
parseTree.AppendFunction(token);
break;
case TokenType.variable:
if (!parseTree.AppendVariable(token.TokenString.ToUpper()))
{
return(null);
}
break;
case TokenType.function:
parseTree.AppendFunction((FunctionToken)token);
break;
default:
ErrorLog.Add(new ErrorMessage("Fatal parsing error: this token type is unknown cannot be appended to the parse tree"));
return(null);
}
}
if (parseTree.children.Count() > 0)
{
//The root node is always redundant by construction
return(parseTree.children.First());
}
else
{
return(null);
}
}
public TreeNode BuildParseTree() {
TreeNode parseTree = new TreeNode();
foreach (IToken token in InAList) {
switch (token.Type) {
case TokenType.keyword:
if (!parseTree.AppendKeyword(token.TokenString))
return null;
break;
case TokenType.number:
parseTree.AppendNumber((NumberToken)token);
break;
case TokenType.infixOperator:
parseTree.AppendFunction(token);
break;
case TokenType.suffixOperator:
parseTree.AppendFunction(token);
break;
case TokenType.variable:
if (!parseTree.AppendVariable(token.TokenString.ToUpper())) {
return null;
}
break;
case TokenType.function:
parseTree.AppendFunction((FunctionToken)token);
break;
default:
ErrorLog.Add(new ErrorMessage("Fatal parsing error: this token type is unknown cannot be appended to the parse tree"));
return null;
}
}
if (parseTree.children.Count() > 0)
//The root node is always redundant by construction
return parseTree.children.First();
else return null;
}
