Add an explicit line highlighting function for the diff

openslides/motions/static/js/motions/base.js

@@ -331,7 +331,7 @@ angular.module('OpenSlidesApp.motions', [
                             text = '';
                             for (var i = 0; i < changes.length; i++) {
                                 text += this.getTextBetweenChangeRecommendations(versionId, (i === 0 ? null : changes[i - 1]), changes[i], highlight);
-                                text += changes[i].getDiff(this, versionId);
+                                text += changes[i].getDiff(this, versionId, highlight);
                             }
                             text += this.getTextRemainderAfterLastChangeRecommendation(versionId, changes);
                             break;
@@ -740,7 +740,13 @@ angular.module('OpenSlidesApp.motions', [
                         oldText = data.outerContextStart + data.innerContextStart +
                             data.html + data.innerContextEnd + data.outerContextEnd;
 
-                    return diffService.diff(oldText, this.text, lineLength, this.line_from);
+                    var diff = diffService.diff(oldText, this.text, lineLength, this.line_from);
+
+                    if (highlight > 0) {
+                        diff = lineNumberingService.highlightLine(diff, highlight);
+                    }
+
+                    return diff;
                 },
                 getType: function(original_full_html) {
                     return this.type;

openslides/motions/static/js/motions/linenumbering.js

@@ -71,6 +71,32 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
             return isLineNumber;
         };
 
+        this._getLineNumberNode = function(fragment, lineNumber) {
+            return fragment.querySelector('.os-line-number.line-number-' + lineNumber);
+        };
+
+        this._htmlToFragment = function(html) {
+            var fragment = document.createDocumentFragment(),
+                div = document.createElement('DIV');
+            div.innerHTML = html;
+            while (div.childElementCount) {
+                var child = div.childNodes[0];
+                div.removeChild(child);
+                fragment.appendChild(child);
+            }
+            return fragment;
+        };
+
+        this._fragmentToHtml = function(fragment) {
+            var div = document.createElement('DIV');
+            while (fragment.firstChild) {
+                var child = fragment.firstChild;
+                fragment.removeChild(child);
+                div.appendChild(child);
+            }
+            return div.innerHTML;
+        };
+
         this._createLineBreak = function () {
             var br = document.createElement('br');
             br.setAttribute('class', 'os-line-break');
@@ -413,6 +439,15 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
             return this._insertLineNumbersToNode(root, lineLength, highlight);
         };
 
+        /**
+         *
+         * @param {string} html
+         * @param {number} lineLength
+         * @param {string} highlight - optional
+         * @param {function} callback
+         * @param {number} firstLine
+         * @returns {string}
+         */
         this.insertLineNumbers = function (html, lineLength, highlight, callback, firstLine) {
             var newHtml, newRoot;
 
@@ -438,12 +473,81 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
             return newHtml;
         };
 
+        /**
+         * @param {string} html
+         * @returns {string}
+         */
         this.stripLineNumbers = function (html) {
             var root = document.createElement('div');
             root.innerHTML = html;
             this._stripLineNumbers(root);
             return root.innerHTML;
         };
+
+        /**
+         * Traverses up the DOM tree until it finds a node with a nextSibling, then returns that sibling
+         *
+         * @param node
+         * @private
+         */
+        this._findNextAuntNode = function(node) {
+            if (node.nextSibling) {
+                return node.nextSibling;
+            } else if (node.parentNode) {
+                return this._findNextAuntNode(node.parentNode);
+            } else {
+                return null;
+            }
+        };
+
+        this._highlightUntilNextLine = function(lineNumberNode) {
+            var currentNode = lineNumberNode,
+                foundNextLineNumber = false;
+
+            do {
+                var wasHighlighted = false;
+                if (currentNode.nodeType === TEXT_NODE) {
+                    var node = document.createElement('span');
+                    node.setAttribute('class', 'highlight');
+                    node.innerHTML = currentNode.nodeValue;
+                    currentNode.parentNode.insertBefore(node, currentNode);
+                    currentNode.parentNode.removeChild(currentNode);
+                    currentNode = node;
+                    wasHighlighted = true;
+                } else {
+                    wasHighlighted = false;
+                }
+
+                if (currentNode.childNodes.length > 0 && !this._isOsLineNumberNode(currentNode) && !wasHighlighted) {
+                    currentNode = currentNode.childNodes[0];
+                } else if (currentNode.nextSibling) {
+                    currentNode = currentNode.nextSibling;
+                } else {
+                    currentNode = this._findNextAuntNode(currentNode);
+                }
+
+                if (this._isOsLineNumberNode(currentNode)) {
+                    foundNextLineNumber = true;
+                }
+            } while (!foundNextLineNumber && currentNode !== null);
+        };
+
+        /**
+         * @param {string} html
+         * @param {number} lineNumber
+         * @return {string}
+         */
+        this.highlightLine = function (html, lineNumber) {
+            var fragment = this._htmlToFragment(html),
+                lineNumberNode = this._getLineNumberNode(fragment, lineNumber);
+
+            if (lineNumberNode) {
+                this._highlightUntilNextLine(lineNumberNode);
+                html = this._fragmentToHtml(fragment);
+            }
+
+            return html;
+        };
     }
 ]);
 

tests/karma/motions/linenumbering.service.test.js

@@ -286,4 +286,42 @@ describe('linenumbering', function () {
       expect(outHtml).toBe("<ul>\n\n<li>" + noMarkup(1) + "Point 1</li>\n\n</ul>");
     });
   });
+
+  describe('line highlighting', function() {
+    it('highlights a simple line', function () {
+        var inHtml = lineNumberingService.insertLineNumbers("<span>Lorem ipsum dolorsit amet</span>", 5);
+        var highlighted = lineNumberingService.highlightLine(inHtml, 2);
+        expect(highlighted).toBe(noMarkup(1) + '<span>Lorem ' + brMarkup(2) + '<span class="highlight">ipsum </span>' + brMarkup(3) + 'dolor' + brMarkup(4) + 'sit ' + brMarkup(5) + 'amet</span>');
+    });
+
+    it('highlights a simple line with formattings', function () {
+        var inHtml = lineNumberingService.insertLineNumbers("<span>Lorem ipsum <strong>dolorsit amet Lorem</strong><em> ipsum dolorsit amet</em> Lorem ipsum dolorsit amet</span>", 20);
+        expect(inHtml).toBe(noMarkup(1) + '<span>Lorem ipsum <strong>dolorsit ' +
+            brMarkup(2) + 'amet Lorem</strong><em> ipsum ' +
+            brMarkup(3) + 'dolorsit amet</em> Lorem ' + brMarkup(4) + 'ipsum dolorsit amet</span>');
+
+        var highlighted = lineNumberingService.highlightLine(inHtml, 2);
+        expect(highlighted).toBe(noMarkup(1) + '<span>Lorem ipsum <strong>dolorsit ' +
+            brMarkup(2) + '<span class="highlight">amet Lorem</span></strong><em><span class="highlight"> ipsum </span>' +
+            brMarkup(3) + 'dolorsit amet</em> Lorem ' + brMarkup(4) + 'ipsum dolorsit amet</span>');
+    });
+
+    it('highlights the last line', function () {
+        var inHtml = lineNumberingService.insertLineNumbers("<span>Lorem ipsum dolorsit amet</span>", 5);
+        var highlighted = lineNumberingService.highlightLine(inHtml, 5);
+        expect(highlighted).toBe(noMarkup(1) + '<span>Lorem ' + brMarkup(2) + 'ipsum ' + brMarkup(3) + 'dolor' + brMarkup(4) + 'sit ' + brMarkup(5) + '<span class="highlight">amet</span></span>');
+    });
+
+    it('highlights the first line', function () {
+        var inHtml = lineNumberingService.insertLineNumbers("<span>Lorem ipsum dolorsit amet</span>", 5);
+        var highlighted = lineNumberingService.highlightLine(inHtml, 1);
+        expect(highlighted).toBe(noMarkup(1) + '<span><span class="highlight">Lorem </span>' + brMarkup(2) + 'ipsum ' + brMarkup(3) + 'dolor' + brMarkup(4) + 'sit ' + brMarkup(5) + 'amet</span>');
+    });
+
+    it('does not change the string if the line number is not found', function () {
+        var inHtml = lineNumberingService.insertLineNumbers("<span>Lorem ipsum dolorsit amet</span>", 5);
+        var highlighted = lineNumberingService.highlightLine(inHtml, 8);
+        expect(highlighted).toBe(noMarkup(1) + '<span>Lorem ' + brMarkup(2) + 'ipsum ' + brMarkup(3) + 'dolor' + brMarkup(4) + 'sit ' + brMarkup(5) + 'amet</span>');
+    });
+  });
 });