Enable multi-line selection on frontend tests

tests/frontend/helper.js

@@ -6,11 +6,11 @@ var helper = {};
   helper.init = function(cb){
     $iframeContainer = $("#iframe-container");
 
-    $.get('/static/js/jquery.js').done(function(code){ 
+    $.get('/static/js/jquery.js').done(function(code){
       // make sure we don't override existing jquery
       jsLibraries["jquery"] = "if(typeof $ === 'undefined') {\n" + code + "\n}";
 
-      $.get('/tests/frontend/lib/sendkeys.js').done(function(code){ 
+      $.get('/tests/frontend/lib/sendkeys.js').done(function(code){
         jsLibraries["sendkeys"] = code;
 
         cb();
@@ -32,7 +32,7 @@ var helper = {};
 
   var getFrameJQuery = function($iframe){
     /*
-      I tried over 9000 ways to inject javascript into iframes. 
+      I tried over 9000 ways to inject javascript into iframes.
       This is the only way I found that worked in IE 7+8+9, FF and Chrome
     */
 
@@ -45,7 +45,7 @@ var helper = {};
 
     win.eval(jsLibraries["jquery"]);
     win.eval(jsLibraries["sendkeys"]);
-    
+
     win.$.window = win;
     win.$.document = doc;
 
@@ -73,14 +73,14 @@ var helper = {};
     if(!padName)
       padName = "FRONTEND_TEST_" + helper.randomString(20);
     $iframe = $("<iframe src='/p/" + padName + "'></iframe>");
-    
+
     //clean up inner iframe references
     helper.padChrome$ = helper.padOuter$ = helper.padInner$ = null;
 
     //clean up iframes properly to prevent IE from memoryleaking
     $iframeContainer.find("iframe").purgeFrame().done(function(){
       $iframeContainer.append($iframe);
-      $iframe.one('load', function(){  
+      $iframe.one('load', function(){
         helper.waitFor(function(){
           return !$iframe.contents().find("#editorloadingbox").is(":visible");
         }, 50000).done(function(){
@@ -92,13 +92,13 @@ var helper = {};
           helper.padChrome$.fx.off = true;
           helper.padOuter$.fx.off = true;
           helper.padInner$.fx.off = true;
-          
+
           opts.cb();
         }).fail(function(){
           throw new Error("Pad never loaded");
         });
       });
-    }); 
+    });
 
     return padName;
   }
@@ -108,7 +108,7 @@ var helper = {};
     var intervalTime = _intervalTime || 10;
 
     var deferred = $.Deferred();
-    
+
     var _fail = deferred.fail;
     var listenForFail = false;
     deferred.fail = function(){
@@ -142,6 +142,65 @@ var helper = {};
     return deferred;
   }
 
+  helper.selectLines = function($startLine, $endLine, startOffset, endOffset){
+    // if no offset is provided, use beginning of start line and end of end line
+    startOffset = startOffset || 0;
+    endOffset   = endOffset   || $endLine.text().length;
+
+    var inner$    = helper.padInner$;
+    var selection = inner$.document.getSelection();
+    var range     = selection.getRangeAt(0);
+
+    var start = getTextNodeAndOffsetOf($startLine, startOffset);
+    var end   = getTextNodeAndOffsetOf($endLine, endOffset);
+
+    range.setStart(start.node, start.offset);
+    range.setEnd(end.node, end.offset);
+
+    selection.removeAllRanges();
+    selection.addRange(range);
+  }
+
+  var getTextNodeAndOffsetOf = function($targetLine, targetOffsetAtLine){
+    var $textNodes = $targetLine.find('*').contents().filter(function(){
+      return this.nodeType === Node.TEXT_NODE;
+    });
+
+    // search node where targetOffsetAtLine is reached, and its 'inner offset'
+    var textNodeWhereOffsetIs = null;
+    var offsetBeforeTextNode = 0;
+    var offsetInsideTextNode = 0;
+    $textNodes.each(function(index, element){
+      var elementTotalOffset = element.textContent.length;
+      textNodeWhereOffsetIs = element;
+      offsetInsideTextNode = targetOffsetAtLine - offsetBeforeTextNode;
+
+      var foundTextNode = offsetBeforeTextNode + elementTotalOffset >= targetOffsetAtLine;
+      if (foundTextNode){
+        return false; //stop .each by returning false
+      }
+
+      offsetBeforeTextNode += elementTotalOffset;
+    });
+
+    // edge cases
+    if (textNodeWhereOffsetIs === null){
+      // there was no text node inside $targetLine, so it is an empty line (<br>).
+      // Use beginning of line
+      textNodeWhereOffsetIs = $targetLine.get(0);
+      offsetInsideTextNode = 0;
+    }
+    // avoid errors if provided targetOffsetAtLine is higher than line offset (maxOffset).
+    // Use max allowed instead
+    var maxOffset = textNodeWhereOffsetIs.textContent.length;
+    offsetInsideTextNode = Math.min(offsetInsideTextNode, maxOffset);
+
+    return {
+      node: textNodeWhereOffsetIs,
+      offset: offsetInsideTextNode,
+    };
+  }
+
   /* Ensure console.log doesn't blow up in IE, ugly but ok for a test framework imho*/
   window.console = window.console || {};
   window.console.log = window.console.log || function(){}