From 7bc06393365fdffe695cef6dd825edf4ce521919 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Aleksander=20=C5=81ukasz?=
 <aleksander.lukasz@nowoczesnapolska.org.pl>
Date: Fri, 9 Aug 2013 13:52:17 +0200
Subject: [PATCH] Represent empty wlxml nodes as DocumentNodeElement with empty
 DocumentTextElement

---
 modules/documentCanvas/canvas/canvas.js       |  5 ++-
 modules/documentCanvas/canvas/canvas.test3.js | 39 ++++++++++++-------
 .../documentCanvas/canvas/documentElement.js  |  4 +-
 3 files changed, 32 insertions(+), 16 deletions(-)

diff --git a/modules/documentCanvas/canvas/canvas.js b/modules/documentCanvas/canvas/canvas.js
index 228bf20..a65375e 100644
--- a/modules/documentCanvas/canvas/canvas.js
+++ b/modules/documentCanvas/canvas/canvas.js
@@ -42,7 +42,8 @@ $.extend(Canvas.prototype, {
                     klass: currentTag.attr('class'),
                     meta: meta,
                     others: others,
-                    rawChildren: currentTag.contents()
+                    rawChildren: currentTag.contents(),
+                    prepopulateOnEmpty: true
                 }, canvas);
 
                 ['orig-before', 'orig-after', 'orig-begin', 'orig-end'].forEach(function(attr) {
@@ -71,7 +72,7 @@ $.extend(Canvas.prototype, {
                         hasSpanBefore = el.prev().length > 0  && getNode($(el.prev()[0])).attr('wlxml-tag') === 'span',
                         hasSpanAfter = el.next().length > 0 && getNode($(el.next()[0])).attr('wlxml-tag') === 'span';
 
-                    if(el.parent().hasClass('canvas-widget'))
+                    if(el.parent().hasClass('canvas-widget') || elParent.attr('document-text-element') !== undefined)
                         return true; // continue
 
                     var addInfo = function(toAdd, where) {
diff --git a/modules/documentCanvas/canvas/canvas.test3.js b/modules/documentCanvas/canvas/canvas.test3.js
index 6a87d95..477aca0 100644
--- a/modules/documentCanvas/canvas/canvas.test3.js
+++ b/modules/documentCanvas/canvas/canvas.test3.js
@@ -250,12 +250,24 @@ describe('Canvas', function() {
                         expect(children[2]).to.be.instanceOf(documentElement.DocumentTextElement);
                     });
             });
-            
-            describe('white characters handling', function() {
-                it('says empty element node has no children', function() {
+
+            describe('empty nodes handling', function() {
+                it('says empty element node from XML source has one empty DocumentTextElement', function() {
                     var c = canvas.fromXML('<section></section>');
-                    expect(c.doc().children().length).to.equal(0);
+                    expect(c.doc().children()).to.have.length(1);
+                    expect(c.doc().children()[0].getText()).to.equal('');
+                });
+
+                it('allows creation of an empty element node', function() {
+                    var c = canvas.fromXML('<section></section>'),
+                        section = c.doc(),
+                        header = section.append({tag: 'header'});
+                    expect(header.children()).to.have.length(0);
                 });
+            });
+            
+            describe('white characters handling', function() {
+
                 it('says element node with one space has one DocumentTextElement', function() {
                     var c = canvas.fromXML('<section> </section>');
                     expect(c.doc().children().length).to.equal(1);
@@ -330,22 +342,22 @@ describe('Canvas', function() {
 
             describe('Basic Element inserting', function() {
                 it('can put new NodeElement at the end', function() {
-                    var c = canvas.fromXML('<section></section>'),
+                    var c = canvas.fromXML('<section><div></div></section>'),
                         appended = c.doc().append({tag: 'header', klass: 'some.class'}),
                         children = c.doc().children();
 
-                    expect(children.length).to.equal(1);
-                    expect(children[0].sameNode(appended)).to.be.true;
+                    expect(children.length).to.equal(2);
+                    expect(children[1].sameNode(appended)).to.be.true;
                 });
 
                 it('can put new TextElement at the end', function() {
-                    var c = canvas.fromXML('<section></section>'),
+                    var c = canvas.fromXML('<section><div><div></section>'),
                         appended = c.doc().append({text: 'Alice'}),
                         children = c.doc().children();
 
-                    expect(children.length).to.equal(1);
-                    expect(children[0].sameNode(appended)).to.be.true;
-                    expect(children[0].getText()).to.equal('Alice');
+                    expect(children.length).to.equal(2);
+                    expect(children[1].sameNode(appended)).to.be.true;
+                    expect(children[1].getText()).to.equal('Alice');
                 });
 
                 it('can put new NodeElement at the beginning', function() {
@@ -1350,8 +1362,9 @@ describe('Canvas', function() {
 
             it('keeps white space between XML nodes - inline case', function() {
                 var xmlIn = '<section>\n\n\n<span></span>\n\n\n<span></span>\n\n\n</section>',
-                c = canvas.fromXML(xmlIn),
-                xmlOut = c.toXML();
+                c = canvas.fromXML(xmlIn);
+                
+                var xmlOut = c.toXML();
 
                 var partsIn = xmlIn.split('\n\n\n'),
                     partsOut = xmlOut.split('\n\n\n');
diff --git a/modules/documentCanvas/canvas/documentElement.js b/modules/documentCanvas/canvas/documentElement.js
index 7dd1f7d..0558a3e 100644
--- a/modules/documentCanvas/canvas/documentElement.js
+++ b/modules/documentCanvas/canvas/documentElement.js
@@ -148,8 +148,10 @@ $.extend(DocumentNodeElement, {
         }
         element.data('other-attrs', params.others);
 
-        if(params.rawChildren) {
+        if(params.rawChildren && params.rawChildren.length) {
             container.append(params.rawChildren);
+        } else if(params.prepopulateOnEmpty) {
+            element.append(DocumentTextElement.create({text: ''}));
         }
         return dom;
     },
-- 
2.20.1