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Feature #5690 » p2c.diff

tenderlovemaking (Aaron Patterson), 10/24/2012 02:40 AM

object.c
return Qnil;
}
static VALUE
rb_mod_single_const_get(VALUE mod, VALUE name, VALUE recur)
{
ID id;
id = rb_check_id(&name);
if (!id) {
if (!rb_is_const_name(name)) {
rb_name_error_str(name, "wrong constant name %s", RSTRING_PTR(name));
}
else if (!rb_method_basic_definition_p(CLASS_OF(mod), id_const_missing)) {
id = rb_to_id(name);
}
else if (mod && rb_class_real(mod) != rb_cObject) {
rb_name_error_str(name, "uninitialized constant %s::%s",
rb_class2name(mod),
RSTRING_PTR(name));
}
else {
rb_name_error_str(name, "uninitialized constant %s", RSTRING_PTR(name));
}
}
if (!rb_is_const_id(id)) {
rb_name_error(id, "wrong constant name %s", rb_id2name(id));
}
return RTEST(recur) ? rb_const_get(mod, id) : rb_const_get_at(mod, id);
}
/*
* call-seq:
* mod.const_get(sym, inherit=true) -> obj
* mod.const_get(str, inherit=true) -> obj
*
* Checks for a constant with the given name in <i>mod</i>
* If +inherit+ is set, the lookup will also search
......
* otherwise a +NameError+ is raised.
*
* Math.const_get(:PI) #=> 3.14159265358979
*
* This method will recursively look up constant names if a namespaced
* class name is provided. For example:
*
* module Foo; class Bar; end end
* Object.const_get 'Foo::Bar'
*
* The +inherit+ flag is respected on each lookup. For example:
*
* module Foo
* class Bar
* VAL = 10
* end
*
* class Baz < Bar; end
* end
*
* Object.const_get 'Foo::Baz::VAL' # => 10
* Object.const_get 'Foo::Baz::VAL', false # => NameError
*/
static VALUE
rb_mod_const_get(int argc, VALUE *argv, VALUE mod)
{
VALUE name, recur;
rb_encoding *enc;
const char *pbeg, *p, *path;
ID id;
if (argc == 1) {
......
else {
rb_scan_args(argc, argv, "11", &name, &recur);
}
id = rb_check_id(&name);
if (!id) {
if (!rb_is_const_name(name)) {
rb_name_error_str(name, "wrong constant name %s", RSTRING_PTR(name));
}
else if (!rb_method_basic_definition_p(CLASS_OF(mod), id_const_missing)) {
id = rb_to_id(name);
}
else if (mod && rb_class_real(mod) != rb_cObject) {
rb_name_error_str(name, "uninitialized constant %s::%s",
rb_class2name(mod),
RSTRING_PTR(name));
if (SYMBOL_P(name)) {
name = rb_sym_to_s(name);
}
enc = rb_enc_get(name);
path = RSTRING_PTR(name);
if (!rb_enc_asciicompat(enc)) {
rb_raise(rb_eArgError, "invalid class path encoding (non ASCII)");
}
pbeg = p = path;
while (*p) {
while (*p && *p != ':') p++;
id = rb_intern3(pbeg, p-pbeg, enc);
if (p[0] == ':') {
if (p[1] != ':') {
rb_raise(rb_eArgError, "undefined class/module %.*s", (int)(p-path), path);
}
p += 2;
pbeg = p;
}
else {
rb_name_error_str(name, "uninitialized constant %s", RSTRING_PTR(name));
if (!RB_TYPE_P(mod, T_MODULE) && !RB_TYPE_P(mod, T_CLASS)) {
rb_raise(rb_eTypeError, "%s does not refer to class/module", path);
}
mod = rb_mod_single_const_get(mod, ID2SYM(id), recur);
}
if (!rb_is_const_id(id)) {
rb_name_error(id, "wrong constant name %s", rb_id2name(id));
}
return RTEST(recur) ? rb_const_get(mod, id) : rb_const_get_at(mod, id);
return mod;
}
/*
test/ruby/test_module.rb
assert_equal(Math::PI, Math.const_get(:PI))
end
def test_nested_get
assert_equal Other, Object.const_get([self.class, Other].join('::'))
assert_equal User::USER, self.class.const_get([User, 'USER'].join('::'))
end
def test_nested_get_symbol
const = [self.class, Other].join('::').to_sym
assert_equal Other, Object.const_get(const)
assert_equal User::USER, self.class.const_get([User, 'USER'].join('::'))
end
def test_nested_get_const_missing
classes = []
klass = Class.new {
define_singleton_method(:const_missing) { |name|
classes << name
klass
}
}
klass.const_get("Foo::Bar::Baz")
assert_equal [:Foo, :Bar, :Baz], classes
end
def test_nested_bad_class
assert_raises(TypeError) do
self.class.const_get([User, 'USER', 'Foo'].join('::'))
end
end
def test_const_set
assert(!Other.const_defined?(:KOALA))
Other.const_set(:KOALA, 99)
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