typeahead_helper: Add escaping highlighter.

(imported from commit 71c08479763da792b581ff191c04889f0383ccc9)

zephyr/static/js/composebox_typeahead.js

@@ -8,8 +8,8 @@ var composebox_typeahead = (function () {
 // the default highlighter.
 //
 // So if you are not using trusted input, you MUST use the a
-// highlighter that escapes, such as composebox_typeahead_highlighter
-// below.
+// highlighter that escapes (i.e. one that calls
+// typeahead_helper.highlight_with_escaping).
 
 var exports = {};
 
@@ -60,7 +60,6 @@ function get_last_recipient_in_pm(query_string) {
     return recipients[recipients.length-1];
 }
 
-// Loosely based on Bootstrap's default highlighter, but with escaping added.
 function composebox_typeahead_highlighter(item) {
     var query = this.query;
     if ($(this.$element).attr('id') === 'private_message_recipient') {
@@ -69,27 +68,7 @@ function composebox_typeahead_highlighter(item) {
         // recent one we're entering.
         query = get_last_recipient_in_pm(this.query);
     }
-    query = query.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&');
-    var regex = new RegExp('(' + query + ')', 'ig');
-    // The result of the split will include the query term, because our regex
-    // has parens in it.
-    // (as per https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String/split)
-    // However, "not all browsers support this capability", so this is a place to look
-    // if we have an issue here in, e.g. IE.
-    var pieces = item.split(regex);
-    // We need to assemble this manually (as opposed to doing 'join') because we need to
-    // (1) escape all the pieces and (2) the regex is case-insensitive, and we need
-    // to know the case of the content we're replacing (you can't just use a bolded
-    // version of 'query')
-    var result = "";
-    $.each(pieces, function(idx, piece) {
-        if (piece.match(regex)) {
-            result += "<strong>" + Handlebars.Utils.escapeExpression(piece) + "</strong>";
-        } else {
-            result += Handlebars.Utils.escapeExpression(piece);
-        }
-    });
-    return result;
+    return typeahead_helper.highlight_with_escaping(query, item);
 }
 
 // nextFocus is set on a keydown event to indicate where we should focus on keyup.

zephyr/static/js/search.js

@@ -39,24 +39,6 @@ function render_object(obj) {
     return "Error";
 }
 
-// Borrowed from composebox_typeahead_highlighter in composebox_typeahead.js.
-function searchbox_typeahead_highlighter(item) {
-    var query = this.query;
-    var string_item = render_object(mapped[item]);
-    query = query.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&');
-    var regex = new RegExp('(' + query + ')', 'ig');
-    var pieces = string_item.split(regex);
-    var result = "";
-    $.each(pieces, function(idx, piece) {
-        if (piece.match(regex)) {
-            result += "<strong>" + Handlebars.Utils.escapeExpression(piece) + "</strong>";
-        } else {
-            result += Handlebars.Utils.escapeExpression(piece);
-        }
-    });
-    return result;
-}
-
 exports.initialize = function () {
     $( "#search_query" ).typeahead({
         source: function (query, process) {
@@ -79,7 +61,11 @@ exports.initialize = function () {
             return labels;
         },
         items: 3,
-        highlighter: searchbox_typeahead_highlighter,
+        highlighter: function (item) {
+            var query = this.query;
+            var string_item = render_object(mapped[item]);
+            return typeahead_helper.highlight_with_escaping(query, string_item);
+        },
         matcher: function (item) {
             var obj = mapped[item];
             var actual_search_term = obj.query;

zephyr/static/js/typeahead_helper.js

@@ -2,6 +2,33 @@ var typeahead_helper = (function () {
 
 var exports = {};
 
+// Loosely based on Bootstrap's default highlighter, but with escaping added.
+exports.highlight_with_escaping = function (query, item) {
+    // query: The text currently in the searchbox
+    // item: The string we are trying to appropriately highlight
+    query = query.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&');
+    var regex = new RegExp('(' + query + ')', 'ig');
+    // The result of the split will include the query term, because our regex
+    // has parens in it.
+    // (as per https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String/split)
+    // However, "not all browsers support this capability", so this is a place to look
+    // if we have an issue here in, e.g. IE.
+    var pieces = item.split(regex);
+    // We need to assemble this manually (as opposed to doing 'join') because we need to
+    // (1) escape all the pieces and (2) the regex is case-insensitive, and we need
+    // to know the case of the content we're replacing (you can't just use a bolded
+    // version of 'query')
+    var result = "";
+    $.each(pieces, function(idx, piece) {
+        if (piece.match(regex)) {
+            result += "<strong>" + Handlebars.Utils.escapeExpression(piece) + "</strong>";
+        } else {
+            result += Handlebars.Utils.escapeExpression(piece);
+        }
+    });
+    return result;
+};
+
 return exports;
 
 }());