Merge pull request #47 from timruffles/fix

Fix implementation to avoid Object.prototype mutation, + perf improvement

Author: omnidan

.gitignore

@@ -4,4 +4,4 @@ node_modules
 *.sublime-workspace
 *.txt
 test.js
-coverage
+coverage

README.md

@@ -22,6 +22,7 @@ emoji.get(':fast_forward:') // `.get` also supports github flavored markdown emo
 emoji.emojify('I :heart: :coffee:!') // replaces all :emoji: with the actual emoji, in this case: returns "I ❤️ ☕️!"
 emoji.random() // returns a random emoji + key, e.g. `{ emoji: '❤️', key: 'heart' }`
 emoji.search('cof') // returns an array of objects with matching emoji's. `[{ emoji: '☕️', key: 'coffee' }, { emoji: ⚰', key: 'coffin'}]`
+emoji.unemojify('I ❤️ 🍕') // replaces the actual emoji with :emoji:, in this case: returns "I :heart: :pizza:"
 ```
 
 ## Options

lib/emoji.js

@@ -1,5 +1,6 @@
 /*jslint node: true*/
 require('string.prototype.codepointat');
+var toArray = require('lodash.toarray');
 
 "use strict";
 
@@ -133,3 +134,25 @@ Emoji.search = function search(str) {
     };
   });
 }
+
+var emojiToCode = Object.keys(Emoji.emoji).reduce(function(h,k) {
+  return h[Emoji.emoji[k]] = k, h;
+}, {});
+
+/**
+ * unemojify a string (replace emoji with :emoji:)
+ * @param  {string} str
+ * @return {string}
+ */
+Emoji.unemojify = function unemojify(str) {
+  if (!str) return '';
+  var words = toArray(str);
+
+  return words.map(function(word) {
+    var emoji_text = emojiToCode[word];
+    if (emoji_text) {
+      return ':'+emoji_text+':';
+    } 
+    return word;
+  }).join('');
+};

package.json

@@ -1,6 +1,6 @@
 {
   "name": "node-emoji",
-  "version": "1.6.1",
+  "version": "1.7.0",
   "description": "simple emoji support for node.js projects",
   "author": "Daniel Bugl <[email protected]>",
   "repository": {
@@ -23,6 +23,7 @@
     "url": "https://github.com/omnidan/node-emoji/issues"
   },
   "dependencies": {
+    "lodash.toarray": "^4.4.0",
     "string.prototype.codepointat": "^0.2.0"
   },
   "devDependencies": {

test/emoji.js

@@ -119,4 +119,24 @@ describe("emoji.js", function () {
       matchingEmojis.length.should.be.exactly(0);
     });
   });
+
+  describe("unemojify(str)", function () {
+    it("should parse emoji and replace them with :emoji:", function() {
+      var coffee = emoji.unemojify('I ❤️  ☕️! -  😯⭐️😍  ::: test : : 👍+');
+      should.exist(coffee);
+      coffee.should.be.exactly('I :heart:  :coffee:! -  :hushed::star::heart_eyes:  ::: test : : :thumbsup:+');
+    })
+
+    it("should leave unknown emoji", function () {
+      var coffee = emoji.unemojify('I ⭐️ :another_one: 🥕');
+      should.exist(coffee);
+      coffee.should.be.exactly('I :star: :another_one: 🥕');
+    });
+
+    it("should parse a complex emoji like woman-kiss-woman and replace it with :woman-kiss-woman:", function() {
+      var coffee = emoji.unemojify('I love 👩‍❤️‍💋‍👩');
+      should.exist(coffee);
+      coffee.should.be.exactly('I love :woman-kiss-woman:');
+    })
+  });
 });