/// <summary>
/// Evaluates this node and all its children
/// </summary>
/// <param name="scope">The scope of this expression</param>
/// <returns></returns>
public override Expression Evaluate(Scope scope)
{
// Evaluate all arguments
for (int i = 0; i < arguments.Count; i++)
{
arguments[i] = arguments[i].Evaluate(scope);
}
// Get signature from symbol table
Signature sig = scope.GetFunction(this);
// If no function is retrieved
if (sig == null)
{
// Unknown function error
Compiler.Compiler.errors.SemErr(t.line, t.col, "Unknown function or ambiguos call to " + methodName);
}
else
{
// Set return type
this.returnType = sig.returnType;
// Step through each argument
for (int i = 0; i < sig.arguments.Count; i++)
{
// If argument expression type is different than expected argument
// Arguments are guaranteed to be compatible since a matching signature was found in the symbol table
if (!arguments[i].returnType.Equals(sig.arguments[i]))
{
// Create implicit type cast to expected argument
Expression expr = arguments[i];
arguments[i] = new CastExpression(sig.arguments[i]);
(arguments[i] as CastExpression).operand = expr;
}
}
}
return this;
}
