Added piped helpers

mustache.js

@@ -33,6 +33,8 @@ var Mustache;
   var eqRe = /\s*=/;
   var curlyRe = /\s*\}/;
   var tagRe = /#|\^|\/|>|\{|&|=|!/;
+  var dotRe = /\s*\.\s*/g;
+  var pipeRe = /\s*\|\s*/g;
 
   // Workaround for https://issues.apache.org/jira/browse/COUCHDB-577
   // See https://github.com/janl/mustache.js/issues/189
@@ -143,18 +145,27 @@ var Mustache;
     return new Context(view, this);
   };
 
-  Context.prototype.lookup = function (name) {
+  Context.prototype.lookup = function (name, view) {
     var value = this._cache[name];
 
     if (!value) {
+
+      if (typeof view === 'undefined' && name.indexOf("|") > 0) {
+        var names = name.split(pipeRe);
+        for (var i=0,len=names.length; i<len; i++) {
+          value = this.lookup(names[i], value);
+        }
+        return value;
+      }
+
       if (name === ".") {
         value = this.view;
       } else {
         var context = this;
 
         while (context) {
           if (name.indexOf(".") > 0) {
-            var names = name.split("."), i = 0;
+            var names = name.split(dotRe), i = 0;
 
             value = context.view;
 
@@ -177,7 +188,7 @@ var Mustache;
     }
 
     if (typeof value === "function") {
-      value = value.call(this.view);
+      value = value.call(typeof view === 'undefined' ? this.view : view);
     }
 
     return value;

test/_files/dot_notation.mustache

@@ -5,5 +5,5 @@
 <p>VAT: {{{price.currency.symbol}}}{{#price}}{{vat}}{{/price}}</p>
 <!-- boring part -->
 <h2>Test truthy false values:</h2>
-<p>Zero: {{truthy.zero}}</p>
-<p>False: {{truthy.notTrue}}</p>
+<p>Zero: {{truthy . zero}}</p>
+<p>False: {{truthy . notTrue}}</p>

test/_files/piped_helpers_date.js

@@ -0,0 +1,6 @@
+({
+    timestamp: 0,
+    iso8601Date: function() {
+        return new Date(this).toISOString();
+    }
+})

test/_files/piped_helpers_date.mustache

@@ -0,0 +1 @@
+{{timestamp | iso8601Date}}

test/_files/piped_helpers_date.txt

@@ -0,0 +1 @@
+1970-01-01T00:00:00.000Z

test/_files/piped_helpers_sum.js

@@ -0,0 +1,14 @@
+({
+    numbers: [1,2,3,4,-10],
+    sum: function() {
+        var total = 0;
+        for (var i=0,len=this.length; i<len; i++) {
+            total += this[i];
+        }
+        return total;
+    },
+    sign: function() {
+        var num = +this;
+        return (num < 0) ? num : '+'+num;
+    }
+})

test/_files/piped_helpers_sum.mustache

@@ -0,0 +1,5 @@
+Numbers:
+{{#numbers}}
+  {{. | sign}}
+{{/numbers}}
+Sum: {{numbers|sum}}

test/_files/piped_helpers_sum.txt

@@ -0,0 +1,7 @@
+Numbers:
+  +1
+  +2
+  +3
+  +4
+  -10
+Sum: 0