public override AstNode Visit(VariableDeclaration node)
{
// Begin the node.
builder.BeginNode(node);
// Get the initial value.
Expression initial = node.GetInitialValue();
if(initial == null)
return builder.EndNode();
// Visit the initial value.
initial.Accept(this);
// Get the initial value type and the node type.
object value = initial.GetNodeValue();
IChelaType valueType = initial.GetNodeType();
IChelaType varType = node.GetNodeType();
// Cast the initial value.
if(valueType != varType)
Cast(node, value, valueType, varType);
// Store the value.
PerformAssignment(node, node.GetVariable());
return builder.EndNode();
}
public override AstNode Visit(VariableDeclaration node)
{
// Get the variable name.
string varName = node.GetName();
// Avoid redefinition.
if(currentContainer.FindMember(varName) != null)
Error(node, "attempting to redefine a variable in a same scope.");
// Get the initial value.
Expression initialValue = node.GetInitialValue();
// Visit the initial value.
// Do this here to use the state previous to the variable declaration.
if(initialValue != null)
initialValue.Accept(this);
// Create the variable.
LocalVariable local = new LocalVariable(node.GetName(), (LexicalScope)currentContainer,
node.GetNodeType());
// Store it in the node.
node.SetVariable(local);
// Check the compatibility with the initial value.
if(initialValue == null)
return node;
// Get the variable type and the initial value type.
IChelaType varType = node.GetNodeType();
IChelaType valueType = initialValue.GetNodeType();
// Class instances are held by reference.
if(varType != valueType && Coerce(node, varType, valueType, initialValue.GetNodeValue()) != varType)
Error(node, "cannot implicitly cast from {0} to {1}.", valueType.GetFullName(), varType.GetFullName());
return node;
}
