public SigmaNode(SyntaxNode expression, NumberNode start, NumberNode end, NumberNode increment) : base(SyntaxType.SIGMA)
{
this.expression = expression;
this.start = start;
this.end = end;
this.increment = increment;
}
private void GenerateReturn(SyntaxNode node, ref string expression)
{
switch (node.type)
{
case SyntaxType.BINARY:
BinaryNode binaryNode = (BinaryNode)node;
GenerateReturn(binaryNode.left, ref expression);
expression += opToString(binaryNode.op);
GenerateReturn(binaryNode.right, ref expression);
break;
case SyntaxType.NUMBER:
NumberNode num = (NumberNode)node;
expression += num.value.ToString();
break;
case SyntaxType.IDENTIFIER:
IdentifierNode identifier = (IdentifierNode)node;
expression += identifier.identifier;
break;
default:
throw new Exception("Unexpected Node");
}
}
private string GenerateNumber(NumberNode node, List <Instruction> instructions)
{
string r = GetRegister();
instructions.Add(new MoveInstruction(node.value.ToString(), r));
return(r);
}
private SyntaxNode ReadSigma()
{
SyntaxNode expression = ReadExpression();
NumberNode start = new NumberNode("0");
NumberNode end = new NumberNode("-1");
NumberNode increment = new NumberNode("1");
if (tokenStream.PeekToken().type == TokenType.NUMBER)
{
Token token = tokenStream.ReadToken();
start = new NumberNode(token.data);
}
if (tokenStream.PeekToken().type == TokenType.NUMBER)
{
Token token = tokenStream.ReadToken();
end = new NumberNode(token.data);
}
if (tokenStream.PeekToken().type == TokenType.NUMBER)
{
Token token = tokenStream.ReadToken();
increment = new NumberNode(token.data);
}
return(new SigmaNode(expression, start, end, increment));
}
private SyntaxNode BindNumber(NumberNode node)
{
return(node);
}
