Exception: NameError

Inherits:
StandardError show all
Defined in:
error.c

Overview

Raised when a given name is invalid or undefined.

puts foo

raises the exception:

NameError: undefined local variable or method `foo' for main:Object

Since constant names must start with a capital:

Fixnum.const_set :answer, 42

raises the exception:

NameError: wrong constant name answer

Direct Known Subclasses

NoMethodError

Defined Under Namespace

Classes: message

Instance Method Summary collapse

Methods inherited from Exception

#==, #backtrace, #exception, exception, #inspect, #message, #set_backtrace

Constructor Details

#new(msg[, name]) ⇒ Object

Construct a new NameError exception. If given the name parameter may subsequently be examined using the NameError.name method.




# File 'error.c'

/*
 * call-seq:
 *   NameError.new(msg [, name])  -> name_error
 *
 * Construct a new NameError exception. If given the <i>name</i>
 * parameter may subsequently be examined using the <code>NameError.name</code>
 * method.
 */

static VALUE
name_err_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE name;

    name = (argc > 1) ? argv[--argc] : Qnil;
    rb_call_super(argc, argv);
    rb_iv_set(self, "name", name);
    return self;
}

Instance Method Details

#name ⇒ String?

Return the name associated with this NameError exception.

Returns:




# File 'error.c'

/*
 *  call-seq:
 *    name_error.name    ->  string or nil
 *
 *  Return the name associated with this NameError exception.
 */

static VALUE
name_err_name(VALUE self)
{
    return rb_attr_get(self, rb_intern("name"));
}

#to_s ⇒ String

Produce a nicely-formatted string representing the NameError.

Returns:




# File 'error.c'

/*
 * call-seq:
 *  name_error.to_s   -> string
 *
 * Produce a nicely-formatted string representing the +NameError+.
 */

static VALUE
name_err_to_s(VALUE exc)
{
    VALUE mesg = rb_attr_get(exc, rb_intern("mesg"));
    VALUE str = mesg;

    if (NIL_P(mesg)) return rb_class_name(CLASS_OF(exc));
    StringValue(str);
    if (str != mesg) {
    rb_iv_set(exc, "mesg", mesg = str);
    }
    if (OBJ_TAINTED(exc)) OBJ_TAINT(mesg);
    return mesg;
}