Update `Float#to_s` to keep trailing zero as CRuby does; ref 68cebb63

src/numeric.c

@@ -249,8 +249,23 @@ flo_div(mrb_state *mrb, mrb_value xv)
   return mrb_float_value(mrb, x);
 }
 
+/* 15.2.9.3.16(x) */
+/*
+ *  call-seq:
+ *     flt.to_s  ->  string
+ *     flt.inspect  ->  string
+ *
+ *  Returns a string containing a representation of self. As well as a
+ *  fixed or exponential form of the number, the call may return
+ *  "<code>NaN</code>", "<code>Infinity</code>", and
+ *  "<code>-Infinity</code>".
+ *
+ *     3.0.to_s   #=> 3.0
+ *     3.25.to_s  #=> 3.25
+ */
+
 static mrb_value
-flo_to_str(mrb_state *mrb, mrb_value flt, mrb_bool add_dot_zero)
+flo_to_s(mrb_state *mrb, mrb_value flt)
 {
   mrb_float f = mrb_float(flt);
   mrb_value str;
@@ -293,7 +308,7 @@ flo_to_str(mrb_state *mrb, mrb_value flt, mrb_bool add_dot_zero)
       str = mrb_float_to_str(mrb, flt, fmt);
       goto insert_dot_zero;
     }
-    else if (add_dot_zero) {
+    else {
       mrb_str_cat(mrb, str, ".0", 2);
     }
 
@@ -305,49 +320,6 @@ flo_to_str(mrb_state *mrb, mrb_value flt, mrb_bool add_dot_zero)
   return str;
 }
 
-/* 15.2.9.3.16(x) */
-/*
- *  call-seq:
- *     flt.to_s  ->  string
- *
- *  Returns a string containing a representation of self. As well as a
- *  fixed or exponential form of the number, the call may return
- *  "<code>NaN</code>", "<code>Infinity</code>", and
- *  "<code>-Infinity</code>".
- *
- *  Trailing <code>.0</code> is removed.
- *
- *     3.0.to_s   #=> 3
- *     3.25.to_s  #=> 3.25
- */
-
-static mrb_value
-flo_to_s(mrb_state *mrb, mrb_value flt)
-{
-  return flo_to_str(mrb, flt, FALSE);
-}
-
-/*
- *  call-seq:
- *     flt.inspect  ->  string
- *
- *  Returns a string containing a representation of self. As well as a
- *  fixed or exponential form of the number, the call may return
- *  "<code>NaN</code>", "<code>Infinity</code>", and
- *  "<code>-Infinity</code>".
- *
- *  Trailing <code>.0</code> is added.
- *
- *     3.0.to_s   #=> 3.0
- *     3.25.to_s  #=> 3.25
- */
-
-static mrb_value
-flo_inspect(mrb_state *mrb, mrb_value flt)
-{
-  return flo_to_str(mrb, flt, TRUE);
-}
-
 /* 15.2.9.3.2  */
 /*
  * call-seq:
@@ -1725,7 +1697,7 @@ mrb_init_numeric(mrb_state *mrb)
   mrb_define_method(mrb, fl,      "eql?",      flo_eql,        MRB_ARGS_REQ(1)); /* 15.2.8.3.16 */
 
   mrb_define_method(mrb, fl,      "to_s",      flo_to_s,       MRB_ARGS_NONE()); /* 15.2.9.3.16(x) */
-  mrb_define_method(mrb, fl,      "inspect",   flo_inspect,    MRB_ARGS_NONE());
+  mrb_define_method(mrb, fl,      "inspect",   flo_to_s   ,    MRB_ARGS_NONE());
   mrb_define_method(mrb, fl,      "nan?",      flo_nan_p,      MRB_ARGS_NONE());
 
 #ifdef INFINITY

test/t/float.rb

@@ -212,10 +212,10 @@ assert('Float#to_s') do
   assert_equal("Infinity", Float::INFINITY.to_s)
   assert_equal("-Infinity", (-Float::INFINITY).to_s)
   assert_equal("NaN", Float::NAN.to_s)
-  assert_equal("0", 0.0.to_s)
-  assert_equal("-0", -0.0.to_s)
+  assert_equal("0.0", 0.0.to_s)
+  assert_equal("-0.0", -0.0.to_s)
   assert_equal("-3.25", -3.25.to_s)
-  assert_equal("50", 50.0.to_s)
+  assert_equal("50.0", 50.0.to_s)
   assert_equal("0.0125", 0.0125.to_s)
   assert_equal("-0.0125", -0.0125.to_s)
   assert_equal("1.0e-10", 0.0000000001.to_s)
@@ -224,8 +224,8 @@ assert('Float#to_s') do
   assert_equal("-1.0e+20", -1e20.to_s)
   assert_equal("1.0e+16", 10000000000000000.0.to_s)
   assert_equal("-1.0e+16", -10000000000000000.0.to_s)
-  assert_equal("100000", 100000.0.to_s)
-  assert_equal("-100000", -100000.0.to_s)
+  assert_equal("100000.0", 100000.0.to_s)
+  assert_equal("-100000.0", -100000.0.to_s)
   if uses_float
     assert_equal("1.0e+08", 100000000.0.to_s)
     assert_equal("-1.0e+08", -100000000.0.to_s)
@@ -234,8 +234,8 @@ assert('Float#to_s') do
   else
     assert_equal("1.0e+15", 1000000000000000.0.to_s)
     assert_equal("-1.0e+15", -1000000000000000.0.to_s)
-    assert_equal("100000000000000", 100000000000000.0.to_s)
-    assert_equal("-100000000000000", -100000000000000.0.to_s)
+    assert_equal("100000000000000.0", 100000000000000.0.to_s)
+    assert_equal("-100000000000000.0", -100000000000000.0.to_s)
   end
 end