From 9805b4bb18b38cbf7f065adcf9aeff9c3619df72 Mon Sep 17 00:00:00 2001
From: Dmitriy Simushev <simushevds@ossg.ru>
Date: Thu, 11 Sep 2014 10:42:02 +0000
Subject: [PATCH] Add "replace" Handlebars.js helper

---
 .../js/source/default/handlebars_helpers.js   | 20 ++++++++
 .../test_cases/handlebars_helpers_tests.js    | 46 +++++++++++++++++++
 2 files changed, 66 insertions(+)

diff --git a/src/mibew/js/source/default/handlebars_helpers.js b/src/mibew/js/source/default/handlebars_helpers.js
index e06fc7ca..889d1bff 100644
--- a/src/mibew/js/source/default/handlebars_helpers.js
+++ b/src/mibew/js/source/default/handlebars_helpers.js
@@ -234,6 +234,26 @@
         return result;
     });
 
+    /**
+     * Registers "replace" helper.
+     *
+     * This helper replaces all found substrings with the specifed replacement.
+     * Example of usage:
+     * <code>
+     *   {{#replace search replacement}}target content{{/replace}}
+     * </code>
+     */
+    Handlebars.registerHelper('replace', function(search, replacement, options) {
+        // Convert serch value to string and escape special regexp characters
+        var searchPattern = search.toString().replace(
+                /[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g,
+                "\\$&"
+            ),
+            re = new RegExp(searchPattern, 'g');
+
+        return options.fn(this).replace(re, replacement);
+    });
+
     /**
      * Registers "cutString" helper.
      *
diff --git a/src/tests/client_side/qunit/test_cases/handlebars_helpers_tests.js b/src/tests/client_side/qunit/test_cases/handlebars_helpers_tests.js
index 2a783f40..8550100c 100644
--- a/src/tests/client_side/qunit/test_cases/handlebars_helpers_tests.js
+++ b/src/tests/client_side/qunit/test_cases/handlebars_helpers_tests.js
@@ -168,6 +168,52 @@ test('repeat', function() {
     );
 });
 
+// Test "replace" Handlebars helper
+test('replace', function() {
+    var template = '{{#replace search replacement}}{{source}}{{/replace}}';
+    var compiledTemplate = Handlebars.compile(template);
+
+    equal(
+        compiledTemplate({
+            source: 'test source',
+            search: 'source',
+            replacement: 'target'
+        }),
+        'test target',
+        'Test single replace'
+    );
+
+    equal(
+        compiledTemplate({
+            source: 'Hello\ncruel\nworld!\n',
+            search: '\n',
+            replacement: '<br/>'
+        }),
+        'Hello<br/>cruel<br/>world!<br/>',
+        'Test multiple replace'
+    );
+
+    equal(
+        compiledTemplate({
+            source: '{{!-- comment',
+            search: '{{!--',
+            replacement: '<!--'
+        }),
+        '<!-- comment',
+        'Test special regexp characters'
+    );
+
+    equal(
+        compiledTemplate({
+            source: '010203040506070809',
+            search: 0,
+            replacement: ''
+        }),
+        '123456789',
+        'Test a number as the search value'
+    );
+});
+
 // Test "cutString" Handlebars helper
 test('cutString', function() {
     var template = '{{#cutString length}}{{str}}{{/cutString}}';