class NameError - RDoc Documentation (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:

Integer.const_set :answer, 42

raises the exception:

NameError: wrong constant name answer

Public Class Methods

new(msg=nil, name=nil, receiver: nil) → 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. receiver parameter allows to pass object in context of which the error happened. Example:

[1, 2, 3].method(:rject) [1, 2, 3].singleton_method(:rject)

static VALUE name_err_initialize(int argc, VALUE *argv, VALUE self) { ID keywords[1]; VALUE values[numberof(keywords)], name, options;

argc = rb_scan_args(argc, argv, "*:", NULL, &options);
keywords[0] = id_receiver;
rb_get_kwargs(options, keywords, 0, numberof(values), values);
name = (argc > 1) ? argv[--argc] : Qnil;
rb_call_super(argc, argv);
name_err_init_attr(self, values[0], name);
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 recv = rb_ivar_lookup(self, id_recv, Qundef); if (!UNDEF_P(recv)) return recv;

VALUE 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");
}

name_error_message_t *ptr;
TypedData_Get_Struct(mesg, name_error_message_t, &name_err_mesg_data_type, ptr);
return ptr->recv;

}