//only supports direct comparaison. No result of operation allowed
//TODO combinator (&& ||)
private ComparaisonNode ParseComparaisonNode(ref int at)
{
ComparaisonNode cn = new ComparaisonNode();
var l_val = ParseValueNode(ref at);
at++;
Signature op = Ast[at].Signature;
at++;
var r_val = ParseValueNode(ref at);
at++;
if (l_val == null || r_val == null || !op.IsComparationOperator())
{
at = 0;
return(null);
}
cn.ComparaisonType = op;
cn.l_op = l_val;
cn.r_op = r_val;
return(cn);
}
private bool ParseIfStatement(ref int at)
{
var ifNode = new IfNode();
//parse operation
at++;
//Parse op
if (Ast[at].Signature != Signature.LPAREN)
{
return(false);
}
at++;
//returns at the position after the second value
ComparaisonNode cn = ParseComparaisonNode(ref at);
if (cn == null)
{
return(false);
}
ifNode.AddComparaisonNode(cn);
if (Ast[at].Signature != Signature.RPAREN)
{
return(false);
}
at++;
if (Ast[at].Signature != Signature.LBRACE)
{
return(false);
}
//get bounds of the {} block
int startOfIfBlock = at;
at++;
var closingBraceFound = GoToClosingBrace(at);
if (closingBraceFound.Item1 == false)
{
return(false);
}
int startOfElseBlock = closingBraceFound.Item2;
startOfElseBlock++;
if (startOfElseBlock < Ast.Count)
{
if (Ast[startOfElseBlock].Signature == Signature.KW_ELSE)
{
ifNode.HasElse = true;
ifNode.AddChild(OperationType.BLOCK);
startOfElseBlock++;
if (Ast[startOfElseBlock].Signature != Signature.LBRACE)
{
return(false);
}
startOfElseBlock++;
if (!GoToClosingBrace(startOfElseBlock).Item1)
{
return(false);
}
}
}
Tree.Current.AddChild(ifNode);
at = startOfIfBlock;
return(true);
}
public void AddComparaisonNode(ComparaisonNode node) => Childrens[0] = node;