Merge the commit r32903:

    * complex.c (nucomp_rationalize): calls rationalize of real part if
      imaginary part is exactly zero.  The patch is made by Marc-Andre
      Lafortune.  fixes [Bug #5178] [ruby-core:38885]
    * test/ruby/test_complex.rb (test_rationalize): add a test for the
      above change.
    * complex.c (nucomp_to_r): fix RDoc comment.  The patch is made by
      Marc-Andre Lafortune.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@32904 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 32 insertions, 4 deletions

diff --git a/ChangeLog b/ChangeLog
index 0dbe07b88b..18c193c6c9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+Wed Aug 10 19:30:00 2011  Kenta Murata  <mrkn@mrkn.jp>
+
+	* backport r32903 from trunk.
+
+	* complex.c (nucomp_rationalize): calls rationalize of real part if
+	  imaginary part is exactly zero.  The patch is made by Marc-Andre
+	  Lafortune.  fixes [Bug #5178] [ruby-core:38885]
+
+	* test/ruby/test_complex.rb (test_rationalize): add a test for the
+	  above change.
+
+	* complex.c (nucomp_to_r): fix RDoc comment.  The patch is made by
+	  Marc-Andre Lafortune.
+
 Wed Aug 10 14:11:07 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (init_mkmf): set $LIBRUBYARG regardless of shared
diff --git a/complex.c b/complex.c
index 4be8099ed6..a701129b73 100644
--- a/complex.c
+++ b/complex.c
@@ -1339,7 +1339,8 @@ nucomp_to_f(VALUE self)
  * call-seq:
  *    cmp.to_r  ->  rational
  *
- * Returns the value as a rational if possible.
+ * If the imaginary part is exactly 0, returns the real part as a Rational,
+ * otherwise a RangeError is raised.
  */
 static VALUE
 nucomp_to_r(VALUE self)
@@ -1358,14 +1359,22 @@ nucomp_to_r(VALUE self)
  * call-seq:
  *    cmp.rationalize([eps])  ->  rational
  *
- * Returns the value as a rational if possible.  An optional argument
- * eps is always ignored.
+ * If the imaginary part is exactly 0, returns the real part as a Rational,
+ * otherwise a RangeError is raised.
  */
 static VALUE
 nucomp_rationalize(int argc, VALUE *argv, VALUE self)
 {
+    get_dat1(self);
+
     rb_scan_args(argc, argv, "01", NULL);
-    return nucomp_to_r(self);
+
+    if (k_inexact_p(dat->imag) || f_nonzero_p(dat->imag)) {
+       VALUE s = f_to_s(self);
+       rb_raise(rb_eRangeError, "can't convert %s into Rational",
+                StringValuePtr(s));
+    }
+    return rb_funcall(dat->real, rb_intern("rationalize"), argc, argv);
 }
 
 /*
diff --git a/test/ruby/test_complex.rb b/test/ruby/test_complex.rb
index 9bdcb3a356..7ff64927ac 100644
--- a/test/ruby/test_complex.rb
+++ b/test/ruby/test_complex.rb
@@ -13,6 +13,11 @@ class Complex_Test < Test::Unit::TestCase
     @unify = $".grep(/(?:^|#{seps})mathn(?:\.(?:rb|so))?/).size != 0
   end
 
+  def test_rationalize
+    assert_equal(1.quo(3), Complex(1/3.0, 0).rationalize, '[ruby-core:38885]')
+    assert_equal(1.quo(5), Complex(0.2, 0).rationalize, '[ruby-core:38885]')
+  end
+
   def test_compsub
     c = ComplexSub.__send__(:convert, 1)