private Bound_Expression_Node Bind_Assignment_Expression(Assignment_Expression_Syntax_Node expression_syntax)
{
var name = expression_syntax.Identifier_Token.Text;
var bound_expression = Bind_Expression(expression_syntax.Expression);
var existing_variable = _variables.Keys.FirstOrDefault(v => v.Name == name);
if (existing_variable != null)
{
_variables.Remove(existing_variable);
}
var variable = new Variable_Symbol(name, bound_expression.Type);
_variables[variable] = null;
return(new Bound_Assignment_Expression_Node(variable, bound_expression));
}
public Bound_Assignment_Expression_Node(Variable_Symbol variable, Bound_Expression_Node expression)
{
Variable = variable;
Expression = expression;
}
public Bound_Variable_Expression_Node(Variable_Symbol variable)
{
Variable = variable;
}
