js-hexfloat - npm Package Compare versions

Comparing version 0.3.1 to 0.4.1

hexfloat.js

 /*
- * $Id: hexfloat.js,v 0.3 2016/01/04 17:53:08 dankogai Exp dankogai $
+ * $Id: hexfloat.js,v 0.4 2016/01/05 07:13:22 dankogai Exp dankogai $
  *
@@ -12,7 +12,11 @@ *  Licensed under the MIT license.
     }
-    var RE_HEXFLOAT =
-        /([\+\-]?)0x([0-9A-F]+)\.?([0-9A-F]*)p([\+\-]?[0-9]*)/i;
+    var pat_hexfloat  =
+        '([\+\-]?)0x([0-9A-F]+)\.?([0-9A-F]*)p([\+\-]?[0-9]*)';
     //   1          2             3           4
-    var parseHexFloat = function(s) {
-        var m = RE_HEXFLOAT.exec(s);
+    var RE_HEXFLOAT   = new RegExp(pat_hexfloat, 'i');
+    var RE_HEXFLOAT_G = new RegExp(pat_hexfloat, 'gi');
+    var parseHexFloat = function() {
+        var m = arguments.length < 2
+            ? RE_HEXFLOAT.exec(arguments[0])
+            : arguments;
         if (!m) return NaN;
@@ -37,5 +41,6 @@ var mantissa = parseInt(m[1] + m[2] + m[3], 16);
     [
-        [ global, 'parseHexFloat', parseHexFloat],
-        [ Number, 'parseHexFloat', parseHexFloat],
-        [ global, 'RE_HEXFLOAT',   RE_HEXFLOAT],
+        [ global, 'parseHexFloat', parseHexFloat ],
+        [ Number, 'parseHexFloat', parseHexFloat ],
+        [ global, 'RE_HEXFLOAT',   RE_HEXFLOAT ],
+        [ global, 'RE_HEXFLOAT_G', RE_HEXFLOAT_G ],
         [ Number.prototype, 'toHexString', toHexString ]
@@ -42,0 +47,0 @@ ].forEach(function(a){

package.json

 {
   "name": "js-hexfloat",
-  "version": "0.3.1",
+  "version": "0.4.1",
   "description": "Rudimentary C99 Hexadecimal Floating Point Support in JS",
@@ -5,0 +5,0 @@ "main": "hexfloat.js",

README.md

@@ -27,2 +27,15 @@ [![build status](https://secure.travis-ci.org/dankogai/js-hexfloat.png)](http://travis-ci.org/dankogai/js-hexfloat)
 
+#### `parseHexFloat` as a callback
+
+From version 0.4.0, you can use `parseHexFloat` with `String.prototype.replace`.
+
+````javascript
+var text = 'e=0x1.5bf0a8b145769p+1, pi=0x1.921fb54442d18p+1';
+text.replace(RE_HEXFLOAT_G, parseHexFloat) // 'e=2.718281828459045, pi=3.141592653589793';
+````
+
+In the case above, parseHexFloat does not apply regexp by itself.  Instead it just takes its `arguments` as the matched result.
+
+Unfortunately `text.replace(RE_HEXFLOAT, parseHexFloat, 'g')` is not standard so `RE_HEXFLOAT_G` is added.
+
 ### `RE_HEXFLOAT`
@@ -36,2 +49,6 @@
 
+### `RE_HEXFLOAT_G`
+
+`RE_HEXFLOAT` with a `g` (global) flag.  See above for usage.
+
 ### `Number.prototype.toHexString()`
@@ -50,3 +67,3 @@
 
-It seems ok to just prepend '0x' and append 'p0' to `.toString(16)` to make a hex float.  Turns out it isn't.  It sometimes drops the last bit in some platforms.
+It seems ok to just prepend '0x' and append 'p0' to `.toString(16)` to make a hex float.  Turns out it isn't.  It sometimes drops the last bits in some occasions.
 
@@ -69,4 +86,27 @@ ````
 
-* http://en.cppreference.com/w/c/language/floating_constant
-* https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html
-* http://search.cpan.org/dist/perl-5.22.0/pod/perldelta.pod#Floating_point_parsing_has_been_improved
+* http://www.exploringbinary.com/hexadecimal-floating-point-constants/
+
+## Appendix: HexFloat in Other Languages
+
+* C
+  * Standard since C99
+  * Literals, output via `%a` in `printf` format, input via `strtod()`, ...
+  * https://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html
+* C++
+  * Standard since C++11
+  * C features plus `std::hexfloat`, ...
+  * http://www.cplusplus.com/reference/ios/hexfloat/
+* Perl 5
+  * Supported since 5.22
+  * Pretty much like C99: literals, the `%a` format, `POSIX::strtod()`, ...
+  * http://perldoc.perl.org/perl5220delta.html
+  * http://www.effectiveperlprogramming.com/2015/06/perl-v5-22-adds-hexadecimal-floating-point-literals/
+* Ruby
+  * Supported since 1.9?
+    * http://docs.ruby-lang.org/ja/1.9.3/doc/print_format.html
+    * http://docs.ruby-lang.org/ja/1.8.7/doc/print_format.html
+  * No literals, output via `%a` for `sprintf`, input via `Float()`
+* Swift
+  * Supported from the beginning
+  * Literals, output via `String(format:"%a", ...)`, input via `Double()`, ...
+  * https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/

test/test.js

 /*
- * $Id: test.js,v 0.2 2016/01/04 17:52:54 dankogai Exp dankogai $
+ * $Id: test.js,v 0.3 2016/01/05 07:13:40 dankogai Exp dankogai $
  *
@@ -9,3 +9,6 @@ * use mocha to test me
     assert = require("assert");
-    parseHexFloat = require('../hexfloat.js').parseHexFloat;
+    G = require('../hexfloat.js');
+    parseHexFloat = G.parseHexFloat;
+    RE_HEXFLOAT = G.RE_HEXFLOAT;
+    RE_HEXFLOAT_G = G.RE_HEXFLOAT_G;
 }
@@ -19,2 +22,4 @@ var is = function (a, e, m) {
 var dead_beef = 57005.7458343505859375;
+var src = 'e=0x1.5bf0a8b145769p+1, pi=0x1.921fb54442d18p+1';
+var dst = 'e=2.718281828459045, pi=3.141592653589793';
 
@@ -54,2 +59,4 @@ describe('Hexadecimal Float', function () {
        is(Number.MAX_VALUE.toHexString(), '0x1.fffffffffffffp+1023'));
+    it('str.replace(RE_HEXFLOAT_G, parseHexFloat)',
+       is(src.replace(RE_HEXFLOAT_G, parseHexFloat), dst));
 });

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Improved metrics

Total package byte prevSize

19783

increased by20.94%

Lines of code

111

increased by12.12%

Number of lines in readme file

109

increased by57.97%

No dependency changes