public object visitClassStmt(Stmt.Class stmt)
{
ClassType enclosingClass = currentClass;
currentClass = ClassType.CLASS;
declare(stmt.name);
define(stmt.name);
if (stmt.superclass != null && stmt.name.lexeme.Equals(stmt.superclass.name.lexeme))
{
Lox.error(stmt.superclass.name, "A class cannot inherit from itself.");
}
if (stmt.superclass != null)
{
currentClass = ClassType.SUBCLASS;
resolve(stmt.superclass);
}
if (stmt.superclass != null)
{
beginScope();
scopes[scopes.Count - 1].Add("super", true);
}
beginScope();
scopes[scopes.Count - 1].Add("this", true);
foreach (Stmt.Function method in stmt.methods)
{
FunctionType declaration = FunctionType.METHOD;
if (method.name.lexeme.Equals("init"))
{
declaration = FunctionType.INITIALIZER;
}
resolveFunction(method, declaration);
}
endScope();
if (stmt.superclass != null)
{
endScope();
}
currentClass = enclosingClass;
return(null);
}
public object visitClassStmt(Stmt.Class stmt)
{
object superclass = null;
if (stmt.superclass != null)
{
superclass = evaluate(stmt.superclass);
if (!(superclass is LoxClass))
{
throw new RuntimeError(stmt.superclass.name, "Superclass must be a class.");
}
}
environment.define(stmt.name.lexeme, null);
if (stmt.superclass != null)
{
environment = new Environment(environment);
environment.define("super", superclass);
}
Dictionary <string, LoxFunction> methods = new Dictionary <string, LoxFunction>();
foreach (Stmt.Function method in stmt.methods)
{
LoxFunction function = new LoxFunction(method, environment, method.name.lexeme.Equals("init"));
methods.Add(method.name.lexeme, function);
}
LoxClass klass = new LoxClass(stmt.name.lexeme, (LoxClass)superclass, methods);
if (superclass != null)
{
environment = environment.enclosing;
}
environment.assign(stmt.name, klass);
return(null);
}