class NameError - Documentation for Ruby 2.3.0 (original) (raw)

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

Public Class Methods

new(msg [, name]) → name_error click to toggle source

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

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

name = (argc > 1) ? argv[--argc] : Qnil;
rb_call_super(argc, argv);
rb_ivar_set(self, id_name, name);
{
    rb_thread_t *th = GET_THREAD();
    rb_control_frame_t *cfp =
        rb_vm_get_ruby_level_next_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp));
    if (cfp) iseqw = rb_iseqw_new(cfp->iseq);
}
rb_ivar_set(self, id_iseq, iseqw);
return self;

}

Public Instance Methods

local_variables → array click to toggle source

Return a list of the local variable names defined where this NameError exception was raised.

Internal use only.

static VALUE name_err_local_variables(VALUE self) { VALUE vars = rb_attr_get(self, id_local_variables);

if (NIL_P(vars)) {
    VALUE iseqw = rb_attr_get(self, id_iseq);
    if (!NIL_P(iseqw)) vars = rb_iseqw_local_variables(iseqw);
    if (NIL_P(vars)) vars = rb_ary_new();
    rb_ivar_set(self, id_local_variables, vars);
}
return vars;

}

name → string or nil click to toggle source

Return the name associated with this NameError exception.

static VALUE name_err_name(VALUE self) { return rb_attr_get(self, id_name); }

receiver → object click to toggle source

Return the receiver associated with this NameError exception.

static VALUE name_err_receiver(VALUE self) { VALUE *ptr, recv, mesg;

recv = rb_ivar_lookup(self, id_receiver, Qundef);
if (recv != Qundef) return recv;

mesg = rb_attr_get(self, id_mesg);
if (!rb_typeddata_is_kind_of(mesg, &name_err_mesg_data_type)) {
    rb_raise(rb_eArgError, "no receiver is available");
}
ptr = DATA_PTR(mesg);
return ptr[NAME_ERR_MESG__RECV];

}