From c92f5811d16d504faf1e49a4963330f78442199d Mon Sep 17 00:00:00 2001
From: Kabir Shah <simplecooldude1@gmail.com>
Date: Sun, 9 Apr 2017 19:27:27 -0700
Subject: [PATCH] allow conditionally set attributes (fixes #25)

---
 dist/moon.js     |   7 ++--
 dist/moon.min.js |   2 +-
 src/util/vdom.js |  11 ++---
 test/js/test.js  | 103 +++++++++++++----------------------------------
 4 files changed, 39 insertions(+), 84 deletions(-)

diff --git a/dist/moon.js b/dist/moon.js
index 22beec7b..c1800f0f 100644
--- a/dist/moon.js
+++ b/dist/moon.js
@@ -541,14 +541,15 @@
         var vnodePropValue = vnodeProps[vnodePropName];
         var nodePropValue = nodeProps[vnodePropName];
     
-        if (nodePropValue == null || vnodePropValue !== nodePropValue) {
-          node.setAttribute(vnodePropName, vnodePropValue);
+        if (vnodePropValue !== false && (nodePropValue == null || vnodePropValue !== nodePropValue)) {
+          node.setAttribute(vnodePropName, vnodePropValue === true ? '' : vnodePropValue);
         }
       }
     
       // Diff Node Props with VNode Props
       for (var nodePropName in nodeProps) {
-        if (vnodeProps[nodePropName] == null) {
+        var _vnodePropValue = vnodeProps[nodePropName];
+        if (_vnodePropValue === undefined || _vnodePropValue === false) {
           node.removeAttribute(nodePropName);
         }
       }
diff --git a/dist/moon.min.js b/dist/moon.min.js
index 44331777..c158d96a 100644
--- a/dist/moon.min.js
+++ b/dist/moon.min.js
@@ -4,4 +4,4 @@
  * Released under the MIT License
  * http://moonjs.ga
  */
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r=t||{};r.type=e;for(var n=this.$events[e],i=this.$events["*"],o=0;o<n.length;o++)n[o](r);if(void 0!==i)for(var o=0;o<i.length;o++)i[o](r)},t.prototype.renderLoop=function(e,t){for(var r=new Array(e.length),n=0;n<e.length;n++)r[n]=t(e[n],n);return r},t.prototype.renderClass=function(e){if("string"==typeof e)return e;var t="";if(Array.isArray(e))for(var r=0;r<e.length;r++)t+=this.renderClass(e[r])+" ";else if("object"==typeof e)for(var n in e)e[n]&&(t+=n+" ");return t=t.slice(0,-1)},t.prototype.mount=function(e){this.$el=document.querySelector(e),this.$destroyed=!1,this.$el.__moon__=this,this.$template=this.$opts.template||this.$el.outerHTML,this.$render===y&&(this.$render=t.compile(this.$template)),this.build(),g(this,"mounted")},t.prototype.render=function(){return this.$render(L)},t.prototype.patch=function(e,t,r){if(void 0!==e.meta&&void 0!==e.meta.el)t.type!==e.type?(E(e.meta.el,x(t,this),r),this.$el=t.meta.el,this.$el.__moon__=this):S(e,t,r,this);else if(e instanceof Node){var n=G(e,t,r,this);n!==e&&(this.$el=t.meta.el,this.$el.__moon__=this)}},t.prototype.build=function(){var e=this.render(),t=null;void 0!==this.$dom.meta?t=this.$dom:(t=this.$el,this.$dom=e),this.patch(t,e,this.$el.parentNode)},t.prototype.init=function(){u("======= Moon ======="),g(this,"init"),void 0!==this.$opts.el&&this.mount(this.$opts.el)},t.config={silent:!0,prefix:"m-",keyCodes:function(e){for(var t in e)o[t]="if(event.keyCode !== "+e[t]+") {return;};"}},t.version="0.8.0",t.util={noop:y,error:l,log:u,merge:m,extend:h,h:L},t.use=function(e){e.init(t)},t.compile=function(e){return ie(e)},t.nextTick=function(e){setTimeout(e,0)},t.directive=function(e,n){r[t.config.prefix+e]=n},t.component=function(e,r){function n(){t.call(this,r)}var o=this;return r.name?e=r.name:r.name=e,n.prototype=Object.create(o.prototype),n.prototype.constructor=n,n.prototype.init=function(){g(this,"init"),this.$destroyed=!1,this.$props=this.$opts.props||[],this.$template=this.$opts.template,this.$render===y&&(this.$render=t.compile(this.$template))},i[e]={CTor:n,opts:r},n},n[t.config.prefix+"if"]={afterGenerate:function(e,t,r,n){return"("+D(e,!1)+") ? "+r+" : null"}},n[t.config.prefix+"show"]={beforeGenerate:function(e,r,n,i){var o={name:t.config.prefix+"show",value:D(e,!1),literal:!0};n.props.directives?n.props.directives.push(o):n.props.directives=[o]}},n[t.config.prefix+"for"]={beforeGenerate:function(e,t,r,n){n.deep=!0},afterGenerate:function(e,t,r,n){var i=e.split(" in "),o=i[0].split(","),s=D(i[1],!1),a=o.join(",");return r.replace(new RegExp('instance\\.get\\("('+o.join("|")+')"\\)',"g"),function(e,t){r=r.replace(new RegExp('instance.get\\("'+t+'"\\)',"g"),t)}),"instance.renderLoop("+s+", function("+a+") { return "+r+"; })"}},n[t.config.prefix+"on"]={beforeGenerate:function(e,t,r){var n=t.arg.split("."),i=n[0],s="event",a=D(e,!1),u=a.split("(");u.length>1&&(a=u.shift(),s=u.join("(").slice(0,-1));var l="";n.shift();for(var c=0;c<n.length;c++)l+=o[n[c]];var p="function(event) {"+l+'instance.callMethod("'+a+'", ['+s+"])}";r.meta.eventListeners[i]?r.meta.eventListeners[i].push(p):r.meta.eventListeners[i]=[p]}},n[t.config.prefix+"model"]={beforeGenerate:function(e,t,r){var n=D(e,!0),i="input",o="value";r.props.attrs.type&&"checkbox"===r.props.attrs.type.value&&(i="change",o="checked");var s='function(event) {instance.set("'+n+'", event.target.'+o+")}";r.meta.eventListeners[i]?r.meta.eventListeners[i].push(s):r.meta.eventListeners[i]=[s];var a=D("{{"+D(e,!1)+"}}",!1);r.props.dom||(r.props.dom={}),r.props.dom[o]=a}},n[t.config.prefix+"literal"]={duringPropGenerate:function(e,t,r){var n=t.arg;return r.props.attrs[n]={value:!0,meta:{}},"class"===n?'"class": instance.renderClass('+D(e,!1)+"), ":'"'+n+'": '+D(e,!1)+", "}},n[t.config.prefix+"html"]={beforeGenerate:function(e,t,r){r.props.dom||(r.props.dom={}),r.props.dom.innerHTML='"'+D(e,!0)+'"'}},r[t.config.prefix+"show"]=function(e,t,r){e.style.display=t?"":"none"},r[t.config.prefix+"mask"]=function(e,t,r){},t});
\ No newline at end of file
diff --git a/src/util/vdom.js b/src/util/vdom.js
index 1987101a..4a5bee8a 100644
--- a/src/util/vdom.js
+++ b/src/util/vdom.js
@@ -139,17 +139,18 @@ const diffProps = function(node, nodeProps, vnode) {
 
   // Diff VNode Props with Node Props
   for(let vnodePropName in vnodeProps) {
-    var vnodePropValue = vnodeProps[vnodePropName];
-    var nodePropValue = nodeProps[vnodePropName];
+    const vnodePropValue = vnodeProps[vnodePropName];
+    const nodePropValue = nodeProps[vnodePropName];
 
-    if(nodePropValue == null || vnodePropValue !== nodePropValue) {
-      node.setAttribute(vnodePropName, vnodePropValue);
+    if((vnodePropValue !== false) && (nodePropValue == null || vnodePropValue !== nodePropValue)) {
+      node.setAttribute(vnodePropName, vnodePropValue === true ? '' : vnodePropValue);
     }
   }
 
   // Diff Node Props with VNode Props
   for(let nodePropName in nodeProps) {
-    if(vnodeProps[nodePropName] == null) {
+    const vnodePropValue = vnodeProps[nodePropName];
+    if(vnodePropValue === undefined || vnodePropValue === false) {
       node.removeAttribute(nodePropName);
     }
   }
diff --git a/test/js/test.js b/test/js/test.js
index 020bae3c..cc69c138 100644
--- a/test/js/test.js
+++ b/test/js/test.js
@@ -2,9 +2,11 @@
 if(!chai) {
   var chai = require("chai");
 }
+
 if(!Moon) {
   var Moon = require("../../dist/moon.js");
 }
+
 if(document.getElementById("moon-els")) {
   var moon_els = document.getElementById("moon-els");
 } else {
@@ -12,8 +14,11 @@ if(document.getElementById("moon-els")) {
   moon_els.id = "moon-els";
   document.body.appendChild(moon_els);
 }
+
 var expect = chai.expect;
+
 Moon.config.silent = true;
+
 var createTestElement = function(id, html) {
   var el = document.createElement("div");
   el.innerHTML = html;
@@ -21,77 +26,9 @@ var createTestElement = function(id, html) {
   moon_els.appendChild(el);
   return el;
 }
-// var MoonPerformance = {
-//   init: function() {
-//     var MoonBuild = Moon.prototype.build;
-//     var MoonInit = Moon.prototype.init;
-//     var MoonRender = Moon.prototype.render;
-//     var MoonMount = Moon.prototype.mount;
-//     var MoonPatch = Moon.prototype.patch;
-//
-//     var formatNum = function(num) {
-//       if(num >= 0.5) {
-//       	return num.toFixed(2) + 'ms'
-//       } else {
-//       	return num.toFixed(2)*1000 + "µs";
-//       }
-//     }
-//
-//     var name = function(instance) {
-//       return instance.$parent ? instance.$name : "root";
-//     }
-//
-//     Moon.prototype.init = function() {
-//       var id = name(this) + "@init";
-//       performance.mark("start " + id);
-//       MoonInit.apply(this, arguments);
-//       performance.mark("end " + id);
-//       performance.measure(id, "start " + id, "end " + id);
-//       var entries = performance.getEntriesByName(id);
-//     }
-//
-//     Moon.prototype.build = function() {
-//       var id = name(this) + "@build";
-//       performance.mark("start " + id);
-//       MoonBuild.apply(this, arguments);
-//       performance.mark("end " + id);
-//       performance.measure(id, "start " + id, "end " + id);
-//       var entries = performance.getEntriesByName(id);
-//     }
-//
-//     Moon.prototype.render = function() {
-//       var id = name(this) + "@render";
-//       performance.mark("start " + id);
-//       var r = MoonRender.apply(this, arguments);
-//       performance.mark("end " + id);
-//       performance.measure(id, "start " + id, "end " + id);
-//       var entries = performance.getEntriesByName(id);
-//       return r;
-//     }
-//
-//     Moon.prototype.mount = function() {
-//       var id = name(this) + "@mount";
-//       performance.mark("start " + id);
-//       MoonMount.apply(this, arguments);
-//       performance.mark("end " + id);
-//       performance.measure(id, "start " + id, "end " + id);
-//       var entries = performance.getEntriesByName(id);
-//     }
-//
-//     Moon.prototype.patch = function() {
-//       var id = name(this) + "@patch";
-//       performance.mark("start " + id);
-//       MoonPatch.apply(this, arguments);
-//       performance.mark("end " + id);
-//       performance.measure(id, "start " + id, "end " + id);
-//       var entries = performance.getEntriesByName(id);
-//     }
-//   }
-// }
-//
-// Moon.use(MoonPerformance);
 
 
+// Begin Tests
 describe('Instance', function() {
   describe('Initializing', function() {
     createTestElement("initialize", "");
@@ -261,12 +198,12 @@ describe('Data', function() {
   //     expect(document.getElementById("data2").innerHTML).to.equal("Nested Object");
   //   });
   // });
-  // it('when setting new data property', function() {
-  //   dataApp3.set("msg.obj.nested", "New Nested");
-  //   Moon.nextTick(function() {
-  //     expect(document.getElementById("data3").innerHTML).to.equal("New Nested");
-  //   });
-  // });
+  it('when setting new data property', function() {
+    dataApp3.set("msg.obj.nested", "New Nested");
+    Moon.nextTick(function() {
+      expect(document.getElementById("data3").innerHTML).to.equal("New Nested");
+    });
+  });
   it('when getting', function() {
     expect(dataApp.get('msg')).to.equal("New Value");
   });
@@ -481,6 +418,7 @@ describe("Directive", function() {
     createTestElement("literal", '<span m-literal:class="({{num}}+1).toString()" id="literal-directive-span"></span>');
     createTestElement("literalClass", '<span m-literal:class="[\'1\', \'2\', \'3\']" id="literal-class-directive-span"></span>');
     createTestElement("literalConditionalClass", '<span m-literal:class="{trueVal: {{trueVal}}, falseVal: {{falseVal}}}" id="literal-conditional-class-directive-span"></span>');
+    createTestElement("literalBooleanValue", '<span m-literal:disabled="{{condition}}" id="literal-boolean-value-directive-span"></span>');
     var literalApp = new Moon({
       el: "#literal",
       data: {
@@ -497,6 +435,12 @@ describe("Directive", function() {
         falseVal: false
       }
     });
+    var literalBooleanValueApp = new Moon({
+      el: "#literalBooleanValue",
+      data: {
+        condition: true
+      }
+    });
     it('should treat the value as a literal expression', function() {
       expect(document.getElementById("literal-directive-span").getAttribute("class")).to.equal("2");
     });
@@ -506,6 +450,15 @@ describe("Directive", function() {
     it('should be able to handle an object of conditional classes', function() {
       expect(document.getElementById("literal-conditional-class-directive-span").getAttribute("class")).to.equal("trueVal");
     });
+    it('should be able to handle a true boolean value', function() {
+      expect(document.getElementById("literal-boolean-value-directive-span").getAttribute("disabled")).to.equal("");
+    });
+    it('should be able to handle a false boolean value', function() {
+      literalBooleanValueApp.set('condition', false);
+      Moon.nextTick(function() {
+        expect(document.getElementById("literal-boolean-value-directive-span").getAttribute("disabled")).to.equal(null);
+      })
+    });
     it('should not be present at runtime', function() {
       expect(document.getElementById('literal-directive-span').getAttribute("m-literal")).to.be['null'];
     });