public bool IdenticalSignature(OperatorDeclaration other)
{
if (this.ReturnType == null && other.ReturnType != null)
return false;
else if (other.ReturnType == null)
return false;
return this.OperatorKeyword == other.OperatorKeyword
&& this.ReturnType.Name.ToLower() == other.ReturnType.Name.ToLower();
}
public OperatorDeclaration GetOperator(OperatorDeclaration sig)
{
if (sig.Type == ASTNodeType.InfixOperator)
return Operators.First(opdecl => opdecl.Value.Type == ASTNodeType.InfixOperator && sig.IdenticalSignature((opdecl.Value as InOpDeclaration))).Value;
else if (sig.Type == ASTNodeType.PrefixOperator)
return Operators.First(opdecl => opdecl.Value.Type == ASTNodeType.PrefixOperator && sig.IdenticalSignature((opdecl.Value as PreOpDeclaration))).Value;
else if (sig.Type == ASTNodeType.PostfixOperator)
return Operators.First(opdecl => opdecl.Value.Type == ASTNodeType.PostfixOperator && sig.IdenticalSignature((opdecl.Value as PostOpDeclaration))).Value;
return null;
}
public bool IdenticalSignature(OperatorDeclaration other)
{
if (this.ReturnType == null && other.ReturnType != null)
{
return(false);
}
else if (other.ReturnType == null)
{
return(false);
}
return(this.OperatorKeyword == other.OperatorKeyword &&
this.ReturnType.Name.ToLower() == other.ReturnType.Name.ToLower());
}
public bool IdenticalSignature(OperatorDeclaration other)
{
if (this.ReturnType == null && other.ReturnType != null)
{
return(false);
}
else if (other.ReturnType == null)
{
return(false);
}
return(this.OperatorKeyword == other.OperatorKeyword &&
string.Equals(this.ReturnType?.Name, other.ReturnType.Name, StringComparison.Ordinal));
}
public bool VisitNode(OperatorDeclaration node)
{
ASTNode returnType = null;
if (node.ReturnType != null)
{
if (!Symbols.TryGetSymbol(node.ReturnType.Name, out returnType, NodeUtils.GetOuterClassScope(node)))
{
return Error("No type named '" + node.ReturnType.Name + "' exists in this scope!", node.ReturnType.StartPos, node.ReturnType.EndPos);
}
else if (!typeof(VariableType).IsAssignableFrom(returnType.GetType()))
{
return Error("Invalid return type, must be a class/struct/enum/primitive.", node.ReturnType.StartPos, node.ReturnType.EndPos);
}
}
Symbols.PushScope(node.OperatorKeyword);
if (node.Type == ASTNodeType.InfixOperator)
{
var op = node as InOpDeclaration;
op.LeftOperand.Outer = node;
Success = Success && op.LeftOperand.AcceptVisitor(this);
op.RightOperand.Outer = node;
Success = Success && op.RightOperand.AcceptVisitor(this);
}
else if (node.Type == ASTNodeType.PrefixOperator)
{
var op = node as PreOpDeclaration;
op.Operand.Outer = node;
Success = Success && op.Operand.AcceptVisitor(this);
}
else if (node.Type == ASTNodeType.PostfixOperator)
{
var op = node as PostOpDeclaration;
op.Operand.Outer = node;
Success = Success && op.Operand.AcceptVisitor(this);
}
Symbols.PopScope();
if (Success == false)
return Error("Error in operator parameters.", node.StartPos, node.EndPos);
if (Symbols.OperatorSignatureExists(node))
return Error("An operator with identical signature to '" + node.OperatorKeyword + "' already exists!", node.StartPos, node.EndPos);
Symbols.AddOperator(node);
return Success;
}
public bool VisitNode(OperatorDeclaration node)
{
// [specifiers] function [returntype] functionname ( [parameter declarations] ) body_or_semicolon
Write("");
if (node.Specifiers.Count > 0)
Append("{0} ", String.Join(" ", node.Specifiers.Select(x => x.Value)));
if (node.Type == ASTNodeType.InfixOperator)
{
var inOp = node as InOpDeclaration;
Append("operator({0}) {1}{2}( ", inOp.Precedence,
(node.ReturnType != null ? node.ReturnType.Name + " " : ""), node.OperatorKeyword);
inOp.LeftOperand.AcceptVisitor(this);
Append(", ");
inOp.RightOperand.AcceptVisitor(this);
}
else if (node.Type == ASTNodeType.PrefixOperator)
{
var preOp = node as PreOpDeclaration;
Append("preoperator {0}{1}( ",
(node.ReturnType != null ? node.ReturnType.Name + " " : ""), node.OperatorKeyword);
preOp.Operand.AcceptVisitor(this);
}
else if (node.Type == ASTNodeType.PostfixOperator)
{
var postOp = node as PostOpDeclaration;
Append("postoperator {0}{1}( ",
(node.ReturnType != null ? node.ReturnType.Name + " " : ""), node.OperatorKeyword);
postOp.Operand.AcceptVisitor(this);
}
Append(" )");
if (node.Body.Statements != null)
{
Write("{0}", "{");
NestingLevel++;
foreach (Variable v in node.Locals)
v.AcceptVisitor(this);
node.Body.AcceptVisitor(this);
NestingLevel--;
Write("{0}", "}");
}
else
Append(";");
return true;
}
public void AddOperator(OperatorDeclaration op)
{
Operators.Add(op.OperatorKeyword.ToLower(), op);
}
public bool OperatorSignatureExists(OperatorDeclaration sig)
{
if (sig.Type == ASTNodeType.InfixOperator)
return Operators.Any(opdecl => opdecl.Value.Type == ASTNodeType.InfixOperator && sig.IdenticalSignature((opdecl.Value as InOpDeclaration)));
else if (sig.Type == ASTNodeType.PrefixOperator)
return Operators.Any(opdecl => opdecl.Value.Type == ASTNodeType.PrefixOperator && sig.IdenticalSignature((opdecl.Value as PreOpDeclaration)));
else if (sig.Type == ASTNodeType.PostfixOperator)
return Operators.Any(opdecl => opdecl.Value.Type == ASTNodeType.PostfixOperator && sig.IdenticalSignature((opdecl.Value as PostOpDeclaration)));
return false;
}