patch 7.4.1430

Problem:    When encoding JSON, turning NaN and Infinity into null without
            giving an error is not useful.
Solution:   Pass NaN and Infinity on.  If the receiver can't handle them it
            will generate the error.

runtime/doc/eval.txt

@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 7.4.  Last change: 2016 Feb 23
+*eval.txt*	For Vim version 7.4.  Last change: 2016 Feb 27
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4561,6 +4561,8 @@ json_encode({expr})					*json_encode()*
 		Vim values are converted as follows:
 		   Number		decimal number
 		   Float		floating point number
+		   Float nan		"NaN"
+		   Float inf		"Infinity"
 		   String		in double quotes (possibly null)
 		   Funcref		not possible, error
 		   List			as an array (possibly null); when
@@ -4571,13 +4573,9 @@ json_encode({expr})					*json_encode()*
 		   v:true		"true"
 		   v:none		"null"
 		   v:null		"null"
-		Note that using v:none is permitted, although the JSON
+		Note that NaN and Infinity are passed on as values.  This is
-		standard does not allow empty items.  This can be useful for
+		missing in the JSON standard, but several implementations do
-		omitting items in an array:
+		allow it.  If not then you will get an error.
-			[0,,,,,5] ~
-		This is much more efficient than:
-			[0,null,null,null,null,5] ~
-		But a strict JSON parser will not accept it.
 
 keys({dict})						*keys()*
 		Return a |List| with all the keys of {dict}.  The |List| is in

src/json.c

@@ -27,8 +27,10 @@
 #  define isnan(x) _isnan(x)
 #  define isinf(x) (!_finite(x) && !_isnan(x))
 # endif
-# if defined(_MSC_VER) && !defined(INFINITY)
+# if !defined(INFINITY) && defined(DBL_MAX)
 #  define INFINITY (DBL_MAX+DBL_MAX)
+# endif
+# if !defined(NAN) && defined(INFINITY)
 #  define NAN (INFINITY-INFINITY)
 # endif
 #endif
@@ -285,12 +287,10 @@ json_encode_item(garray_T *gap, typval_T *val, int copyID, int options)
 	case VAR_FLOAT:
 #ifdef FEAT_FLOAT
 # if defined(HAVE_MATH_H)
-	    if ((options & JSON_JS) && isnan(val->vval.v_float))
+	    if (isnan(val->vval.v_float))
 		ga_concat(gap, (char_u *)"NaN");
-	    else if ((options & JSON_JS) && isinf(val->vval.v_float))
+	    else if (isinf(val->vval.v_float))
 		ga_concat(gap, (char_u *)"Infinity");
-	    else if (isnan(val->vval.v_float) || isinf(val->vval.v_float))
-		ga_concat(gap, (char_u *)"null");
 	    else
 # endif
 	    {

src/testdir/test_json.vim

@@ -19,11 +19,9 @@ let s:varnr = 1234
 if has('float')
   let s:jsonfl = '12.34'
   let s:varfl = 12.34
-  let s:jsoninf = 'null'
+  let s:jsoninf = 'Infinity'
-  let s:jsinf = 'Infinity'
   let s:varinf = 1.0 / 0.0
-  let s:jsonnan = 'null'
+  let s:jsonnan = 'NaN'
-  let s:jsnan = 'NaN'
   let s:varnan = 0.0 / 0.0
 endif
 
@@ -175,8 +173,8 @@ func Test_js_encode()
   call assert_equal(s:jsonnr, js_encode(s:varnr))
   if has('float')
     call assert_equal(s:jsonfl, js_encode(s:varfl))
-    call assert_equal(s:jsinf, js_encode(s:varinf))
+    call assert_equal(s:jsoninf, js_encode(s:varinf))
-    call assert_equal(s:jsnan, js_encode(s:varnan))
+    call assert_equal(s:jsonnan, js_encode(s:varnan))
   endif
 
   call assert_equal(s:jsonl1, js_encode(s:varl1))
@@ -213,8 +211,8 @@ func Test_js_decode()
   call assert_equal(s:varnr, js_decode(s:jsonnr))
   if has('float')
     call assert_equal(s:varfl, js_decode(s:jsonfl))
-    call assert_equal(s:varinf, js_decode(s:jsinf))
+    call assert_equal(s:varinf, js_decode(s:jsoninf))
-    call assert_true(isnan(js_decode(s:jsnan)))
+    call assert_true(isnan(js_decode(s:jsonnan)))
   endif
 
   call assert_equal(s:varl1, js_decode(s:jsonl1))

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1430,
 /**/
     1429,
 /**/