search: Extract phrase_match to common.js.

Extracts phrase_match to common.js so it can be used by other
components like integrations search.

frontend_tests/node_tests/common.js

@@ -6,3 +6,13 @@ run_test('basics', () => {
     common.autofocus('#home');
     assert($('#home').is_focused());
 });
+
+run_test('phrase_match', () => {
+    assert(common.phrase_match('tes', 'test'));
+    assert(common.phrase_match('Tes', 'test'));
+    assert(common.phrase_match('Tes', 'Test'));
+    assert(common.phrase_match('tes', 'Stream Test'));
+
+    assert(!common.phrase_match('tests', 'test'));
+    assert(!common.phrase_match('tes', 'hostess'));
+});

frontend_tests/node_tests/search_suggestion.js

@@ -7,6 +7,7 @@ zrequire('stream_data');
 zrequire('topic_data');
 zrequire('people');
 zrequire('unread');
+zrequire('common');
 var search = zrequire('search_suggestion');
 
 var bob = {

static/js/common.js

@@ -69,6 +69,25 @@ exports.password_warning = function (password, password_field) {
     return zxcvbn(password).feedback.warning || i18n.t("Password is too weak");
 };
 
+exports.phrase_match = function (query, phrase) {
+    // match "tes" to "test" and "stream test" but not "hostess"
+    var i;
+    query = query.toLowerCase();
+
+    phrase = phrase.toLowerCase();
+    if (phrase.indexOf(query) === 0) {
+        return true;
+    }
+
+    var parts = phrase.split(' ');
+    for (i = 0; i < parts.length; i += 1) {
+        if (parts[i].indexOf(query) === 0) {
+            return true;
+        }
+    }
+    return false;
+};
+
 return exports;
 
 }());

static/js/search_suggestion.js

@@ -2,27 +2,8 @@ var search_suggestion = (function () {
 
 var exports = {};
 
-function phrase_match(phrase, q) {
-    // match "tes" to "test" and "stream test" but not "hostess"
-    var i;
-    q = q.toLowerCase();
-
-    phrase = phrase.toLowerCase();
-    if (phrase.indexOf(q) === 0) {
-        return true;
-    }
-
-    var parts = phrase.split(' ');
-    for (i = 0; i < parts.length; i += 1) {
-        if (parts[i].indexOf(q) === 0) {
-            return true;
-        }
-    }
-    return false;
-}
-
 function stream_matches_query(stream_name, q) {
-    return phrase_match(stream_name, q);
+    return common.phrase_match(q, stream_name);
 }
 
 function highlight_person(query, person) {
@@ -325,7 +306,7 @@ function get_topic_suggestions(last, operators) {
 
     if (guess !== '') {
         topics = _.filter(topics, function (topic) {
-            return phrase_match(topic, guess);
+            return common.phrase_match(guess, topic);
         });
     }
 
@@ -531,7 +512,7 @@ function get_operator_suggestions(last) {
 
     var choices = ['stream', 'topic', 'pm-with', 'sender', 'near', 'from', 'group-pm-with'];
     choices = _.filter(choices, function (choice) {
-        return phrase_match(choice, last_operand);
+        return common.phrase_match(last_operand, choice);
     });
 
     return _.map(choices, function (choice) {