public int arity() { LoxFunction initializer = findMethod("init"); if (initializer == null) { return(0); } return(initializer.arity()); }
public object call(Interpreter interpreter, List <object> arguments) { LoxInstance instance = new LoxInstance(this); LoxFunction initializer = findMethod("init"); if (initializer != null) { initializer.bind(instance).call(interpreter, arguments); } return(instance); }
public object get(Token name) { if (fields.ContainsKey(name.lexeme)) { return(fields[name.lexeme]); } LoxFunction method = klass.findMethod(name.lexeme); if (method != null) { return(method.bind(this));// method; } throw new RuntimeError(name, "Undefined property '" + name.lexeme + "'."); }
public object visitSuperExpr(Expr.Super expr) { int distance = locals[expr]; LoxClass superclass = (LoxClass)environment.getAt(distance, "super"); // "this" is always one level nearer than "super"'s environment LoxInstance object_ = (LoxInstance)environment.getAt(distance - 1, "this"); LoxFunction method = superclass.findMethod(expr.method.lexeme); if (method == null) { throw new RuntimeError(expr.method, "Undefined property '" + expr.method.lexeme + "'."); } return(method.bind(object_)); }
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); }