made consistent with already used style

twemoji-generator.js

@@ -500,10 +500,22 @@ function createTwemoji(re) {
           test: test
         },
 
+        // used to escape HTML special chars in attributes
+        escaper = {
+          '&': '&',
+          '<': '&lt;',
+          '>': '&gt;',
+          "'": '&#39;',
+          '"': '&quot;'
+        },
+
         // RegExp based on emoji's official Unicode standards
         // http://www.unicode.org/Public/UNIDATA/EmojiSources.txt
         re = /twemoji/,
 
+        // used to find HTML special chars in attributes
+        rescaper = /[&<>'"]/g,
+
         // nodes with type 1 which should **not** be parsed
         shouldntBeParsed = /IFRAME|NOFRAMES|NOSCRIPT|SCRIPT|SELECT|STYLE|TEXTAREA/,
 
@@ -533,16 +545,7 @@ function createTwemoji(re) {
        * @return  string  text encoded to use in HTML attribute
        */
       function escapeHTML(s) {
-        var escaped = {
-          '&': '&amp;',
-          '<': '&lt;',
-          '>': '&gt;',
-          "'": '&#39;',
-          '"': '&quot;'
-        };
-        return s.replace(/[&<>'"]/g, function (m) {
-          return escaped[m];
-        });
+        return s.replace(rescaper, replacer);
       }
 
       /**
@@ -622,6 +625,8 @@ function createTwemoji(re) {
         var
           allText = grabAllTextNodes(node, []),
           length = allText.length,
+          attrib,
+          attrname,
           modified,
           fragment,
           subnode,
@@ -661,19 +666,17 @@ function createTwemoji(re) {
                 img = new Image();
                 img.onerror = twemoji.onerror;
                 img.setAttribute('draggable', 'false');
-                
-                var attrib = options.attributes(icon, variant);
-                if (attrib) {
-                  for (var attrname in attrib) {
-                    if (attrib.hasOwnProperty(attrname)) {
-                      // don't allow any handlers to be set, don't allow overrides
-                      if (attrname.indexOf('on') !== 0 && !img.hasAttribute(attrname)) {
+                attrib = options.attributes(icon, variant);
+                for (attrname in attrib) {
+                  if (
+                    attrib.hasOwnProperty(attrname) &&
+                    // don't allow any handlers to be set + don't allow overrides
+                    attrname.indexOf('on') !== 0 &&
+                    !img.hasAttribute(attrname)
+                  ) {
                     img.setAttribute(attrname, attrib[attrname]);
                   }
                 }
-                  }
-                }
-                
                 img.className = options.className;
                 img.alt = alt;
                 img.src = src;
@@ -715,8 +718,11 @@ function createTwemoji(re) {
        */
       function parseString(str, options) {
         return replace(str, function (match, icon, variant) {
-          var src;
-          var ret = match;
+          var
+            ret = match,
+            attrib,
+            attrname,
+            src;
           // verify the variant is not the FE0E one
           // this variant means "emoji as text" and should not
           // require any action/replacement
@@ -742,18 +748,17 @@ function createTwemoji(re) {
                 src,
                 '"'
               );
-              var attrib = options.attributes(icon, variant);
-              if (attrib) {
-                for (var attrname in attrib) { 
-                  if (attrib.hasOwnProperty(attrname)) {
-                    // don't allow any handlers to be set, don't allow overrides
-                    if (attrname.indexOf('on') !== 0 && ret.indexOf(' ' + attrname + '=') === -1) {
+              attrib = options.attributes(icon, variant);
+              for (attrname in attrib) { 
+                if (
+                  attrib.hasOwnProperty(attrname) &&
+                  // don't allow any handlers to be set + don't allow overrides
+                  attrname.indexOf('on') !== 0 &&
+                  ret.indexOf(' ' + attrname + '=') === -1
+                ) {
                   ret = ret.concat(' ', attrname, '="', escapeHTML(attrib[attrname]), '"');
                 }
               }
-                }
-              }
-              
               ret = ret.concat('>');
             }
           }
@@ -761,6 +766,23 @@ function createTwemoji(re) {
         });
       }
 
+      /**
+       * Function used to actually replace HTML special chars
+       * @param   string  HTML special char
+       * @return  string  encoded HTML special char
+       */
+      function replacer(m) {
+        return escaper[m];
+      }
+
+      /**
+       * Default options.attribute callback
+       * @return  null
+       */
+      function returnNull() {
+        return null;
+      }
+
       /**
        * Given a generic value, creates its squared counterpart if it's a number.
        *  As example, number 36 will return '36x36'.
@@ -802,7 +824,7 @@ function createTwemoji(re) {
         // otherwise use the DOM tree and parse text nodes only
         return (typeof what === 'string' ? parseString : parseNode)(what, {
           callback:   how.callback || defaultImageSrcGenerator,
-          attributes: typeof how.attributes === 'function' ? how.attributes : function() {return {};},
+          attributes: typeof how.attributes === 'function' ? how.attributes : returnNull,
           base:       typeof how.base === 'string' ? how.base : twemoji.base,
           ext:        how.ext || twemoji.ext,
           size:       how.folder || toSizeSquaredAsset(how.size || twemoji.size),