Revert r36699 and r36700. [Feature ruby#6130]

Revert "Kernel#inspect: improve consistency and do not call #to_s."
Revert "update PP with recent Kernel#inspect change. Patch by Yusuke Endoh."

r36699 cause test-all failure on test/drb/test_drb.rb and
test/drb/test_drbssl.rb. Run test-all before commit.

Moreover its ChangeLog formst is wrong: see CommitterHowto
https://bugs.ruby-lang.org/projects/ruby/wiki/CommitterHowto#ChangeLog

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,26 +1,3 @@
-Tue Aug 14 19:19:10 2012  Benoit Daloze  <eregontp@gmail.com>
-
-	update PP with recent Kernel#inspect change. Patch by Yusuke Endoh.
-
-	* lib/pp.rb (class PP): do not call #to_s anymore, as #inspect no more does.
-	* test/test_pp.rb (class PPInspectTest): remove related assertion.
-	  [ruby-core:43238][Feature #6130]
-
-Tue Aug 14 19:09:38 2012  Benoit Daloze  <eregontp@gmail.com>
-
-	Kernel#inspect: improve consistency and do not call #to_s.
-
-	A class can now benefit from the nice default #inspect even if it
-	defines #to_s. Also, there is no more unexpected change in #inspect
-	result. Internal structures have been adapted so they don't rely
-	on the removed behavior (#inspect calling overridden #to_s).
-
-	* object.c (rb_obj_inspect): Kernel#inspect: do not call #to_s.
-	* test/ruby/test_object.rb (test_inspect): add tests for Kernel#inspect.
-	* bignum.c, io.c, numeric.c, object.c, proc.c, vm.c (Init_*):
-	  alias #inspect to #to_s where it was expected.
-	  [ruby-core:43238][Feature #6130]
-
 Tue Aug 14 16:25:46 2012  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* test/erb/test_erb.rb (test_html_escape): add assertions for the

bignum.c

@@ -3835,7 +3835,6 @@ Init_Bignum(void)
     rb_cBignum = rb_define_class("Bignum", rb_cInteger);
 
     rb_define_method(rb_cBignum, "to_s", rb_big_to_s, -1);
-    rb_define_alias(rb_cBignum, "inspect", "to_s");
     rb_define_method(rb_cBignum, "coerce", rb_big_coerce, 1);
     rb_define_method(rb_cBignum, "-@", rb_big_uminus, 0);
     rb_define_method(rb_cBignum, "+", rb_big_plus, 1);

io.c

@@ -11505,7 +11505,6 @@ Init_IO(void)
     rb_define_method(rb_cARGF, "initialize", argf_initialize, -2);
     rb_define_method(rb_cARGF, "initialize_copy", argf_initialize_copy, 1);
     rb_define_method(rb_cARGF, "to_s", argf_to_s, 0);
-    rb_define_alias(rb_cARGF, "inspect", "to_s");
     rb_define_method(rb_cARGF, "argv", argf_argv, 0);
 
     rb_define_method(rb_cARGF, "fileno", argf_fileno, 0);

lib/pp.rb

@@ -265,7 +265,8 @@ class SingleLine < PrettyPrint::SingleLine
   module ObjectMixin
     # 1. specific pretty_print
     # 2. specific inspect
-    # 3. generic pretty_print
+    # 3. specific to_s
+    # 4. generic pretty_print
 
     # A default pretty printing method for general objects.
     # It calls #pretty_print_instance_variables to list instance variables.
@@ -282,10 +283,18 @@ def pretty_print(q)
         inspect_method = method_method.call(:inspect)
       rescue NameError
       end
+      begin
+        to_s_method = method_method.call(:to_s)
+      rescue NameError
+      end
       if inspect_method && /\(Kernel\)#/ !~ inspect_method.inspect
         q.text self.inspect
       elsif !inspect_method && self.respond_to?(:inspect)
         q.text self.inspect
+      elsif to_s_method && /\(Kernel\)#/ !~ to_s_method.inspect
+        q.text self.to_s
+      elsif !to_s_method && self.respond_to?(:to_s)
+        q.text self.to_s
       else
         q.pp_object(self)
       end

numeric.c

@@ -3660,7 +3660,6 @@ Init_Numeric(void)
     rb_cFixnum = rb_define_class("Fixnum", rb_cInteger);
 
     rb_define_method(rb_cFixnum, "to_s", fix_to_s, -1);
-    rb_define_alias(rb_cFixnum, "inspect", "to_s");
 
     rb_define_method(rb_cFixnum, "-@", fix_uminus, 0);
     rb_define_method(rb_cFixnum, "+", fix_plus, 1);
@@ -3721,7 +3720,6 @@ Init_Numeric(void)
     rb_define_const(rb_cFloat, "NAN", DBL2NUM(NAN));
 
     rb_define_method(rb_cFloat, "to_s", flo_to_s, 0);
-    rb_define_alias(rb_cFloat, "inspect", "to_s");
     rb_define_method(rb_cFloat, "coerce", flo_coerce, 1);
     rb_define_method(rb_cFloat, "-@", flo_uminus, 0);
     rb_define_method(rb_cFloat, "+", flo_plus, 1);

object.c

@@ -450,8 +450,11 @@ inspect_obj(VALUE obj, VALUE str, int recur)
  *     obj.inspect   -> string
  *
  * Returns a string containing a human-readable representation of <i>obj</i>.
- * By default, show the class name and the list of the instance variables and
- * their values (by calling #inspect on each of them).
+ * By default, if the <i>obj</i> has instance variables, show the class name
+ * and instance variable details which is the list of the name and the result
+ * of <i>inspect</i> method for each instance variable.
+ * Otherwise uses the <i>to_s</i> method to generate the string.
+ * If the <i>to_s</i> method is overridden, uses it.
  * User defined classes should override this method to make better
  * representation of <i>obj</i>.  When overriding this method, it should
  * return a string whose encoding is compatible with the default external
@@ -476,21 +479,35 @@ inspect_obj(VALUE obj, VALUE str, int recur)
  *         "baz"
  *       end
  *     end
- *     Baz.new.inspect                  #=> "#<Baz:0x0300c868>"
+ *     Baz.new.inspect                  #=> "baz"
  */
 
 static VALUE
 rb_obj_inspect(VALUE obj)
 {
-    if (rb_ivar_count(obj) > 0) {
-	VALUE str;
-	const char *c = rb_obj_classname(obj);
+    if (RB_TYPE_P(obj, T_OBJECT) && rb_obj_basic_to_s_p(obj)) {
+        int has_ivar = 0;
+        VALUE *ptr = ROBJECT_IVPTR(obj);
+        long len = ROBJECT_NUMIV(obj);
+        long i;
+
+        for (i = 0; i < len; i++) {
+            if (ptr[i] != Qundef) {
+                has_ivar = 1;
+                break;
+            }
+        }
+
+        if (has_ivar) {
+            VALUE str;
+            const char *c = rb_obj_classname(obj);
 
-	str = rb_sprintf("-<%s:%p", c, (void*)obj);
-	return rb_exec_recursive(inspect_obj, obj, str);
-    } else {
+            str = rb_sprintf("-<%s:%p", c, (void*)obj);
+            return rb_exec_recursive(inspect_obj, obj, str);
+        }
 	return rb_any_to_s(obj);
     }
+    return rb_funcall(obj, rb_intern("to_s"), 0, 0);
 }
 
 static VALUE
@@ -2934,7 +2951,6 @@ Init_Object(void)
     rb_define_method(rb_cModule, ">=", rb_mod_ge, 1);
     rb_define_method(rb_cModule, "initialize_copy", rb_mod_init_copy, 1); /* in class.c */
     rb_define_method(rb_cModule, "to_s", rb_mod_to_s, 0);
-    rb_define_alias(rb_cModule, "inspect", "to_s");
     rb_define_method(rb_cModule, "included_modules", rb_mod_included_modules, 0); /* in class.c */
     rb_define_method(rb_cModule, "include?", rb_mod_include_p, 1); /* in class.c */
     rb_define_method(rb_cModule, "name", rb_mod_name, 0);  /* in variable.c */
@@ -2987,7 +3003,6 @@ Init_Object(void)
 
     rb_cTrueClass = rb_define_class("TrueClass", rb_cObject);
     rb_define_method(rb_cTrueClass, "to_s", true_to_s, 0);
-    rb_define_alias(rb_cTrueClass, "inspect", "to_s");
     rb_define_method(rb_cTrueClass, "&", true_and, 1);
     rb_define_method(rb_cTrueClass, "|", true_or, 1);
     rb_define_method(rb_cTrueClass, "^", true_xor, 1);
@@ -3000,7 +3015,6 @@ Init_Object(void)
 
     rb_cFalseClass = rb_define_class("FalseClass", rb_cObject);
     rb_define_method(rb_cFalseClass, "to_s", false_to_s, 0);
-    rb_define_alias(rb_cFalseClass, "inspect", "to_s");
     rb_define_method(rb_cFalseClass, "&", false_and, 1);
     rb_define_method(rb_cFalseClass, "|", false_or, 1);
     rb_define_method(rb_cFalseClass, "^", false_xor, 1);

proc.c

@@ -2217,7 +2217,6 @@ Init_Proc(void)
     rb_define_method(rb_cProc, "eql?", proc_eq, 1);
     rb_define_method(rb_cProc, "hash", proc_hash, 0);
     rb_define_method(rb_cProc, "to_s", proc_to_s, 0);
-    rb_define_alias(rb_cProc, "inspect", "to_s");
     rb_define_method(rb_cProc, "lambda?", rb_proc_lambda_p, 0);
     rb_define_method(rb_cProc, "binding", proc_binding, 0);
     rb_define_method(rb_cProc, "curry", proc_curry, -1);

test/ruby/test_object.rb

@@ -690,31 +690,6 @@ def test_to_s
     assert_equal(true, s.tainted?)
   end
 
-  def test_inspect
-    x = Object.new
-    assert_match(/\A#<Object:0x\h+>\z/, x.inspect)
-
-    x.instance_variable_set(:@ivar, :value)
-    assert_match(/\A#<Object:0x\h+ @ivar=:value>\z/, x.inspect)
-
-    x = Object.new
-    x.instance_variable_set(:@recur, x)
-    assert_match(/\A#<Object:0x\h+ @recur=#<Object:0x\h+ \.\.\.>>\z/, x.inspect)
-
-    x = Object.new
-    x.instance_variable_set(:@foo, "value")
-    x.instance_variable_set(:@bar, 42)
-    assert_match(/\A#<Object:0x\h+ (?:@foo="value", @bar=42|@bar=42, @foo="value")>\z/, x.inspect)
-
-    # #inspect does not call #to_s anymore
-    feature6130 = '[ruby-core:43238]'
-    x = Object.new
-    def x.to_s
-      "to_s"
-    end
-    assert_match(/\A#<Object:0x\h+>\z/, x.inspect, feature6130)
-  end
-
   def test_exec_recursive
     Thread.current[:__recursive_key__] = nil
     a = [[]]

test/test_pp.rb

@@ -118,6 +118,7 @@ def test_to_s_without_iv
     def a.to_s() "aaa" end
     result = PP.pp(a, '')
     assert_equal("#{a.inspect}\n", result)
+    assert_equal("aaa\n", result)
   end
 end
 

vm.c

@@ -2229,7 +2229,6 @@ Init_top_self(void)
 
     vm->top_self = rb_obj_alloc(rb_cObject);
     rb_define_singleton_method(rb_vm_top_self(), "to_s", main_to_s, 0);
-    rb_define_alias(rb_singleton_class(rb_vm_top_self()), "inspect", "to_s");
 
     /* initialize mark object array */
     vm->mark_object_ary = rb_ary_tmp_new(1);