Add contextPath tracking in builtin helpers

lib/handlebars/base.js

@@ -70,12 +70,19 @@ function registerDefaultHelpers(instance) {
       return inverse(this);
     } else if (isArray(context)) {
       if(context.length > 0) {
+        options.ids = [options.name];
         return instance.helpers.each(context, options);
       } else {
         return inverse(this);
       }
     } else {
-      return fn(context);
+      if (options.ids) {
+        var data = createFrame(options.data);
+        data.contextPath = Utils.appendContextPath(options.data.contextPath, options.name);
+        options = {data: data};
+      }
+
+      return fn(context, options);
     }
   });
 
@@ -89,6 +96,11 @@ function registerDefaultHelpers(instance) {
     var fn = options.fn, inverse = options.inverse;
     var i = 0, ret = "", data;
 
+    var contextPath;
+    if (options.ids) {
+      contextPath = Utils.appendContextPath(options.data.contextPath, options.ids[0]) + '.';
+    }
+
     if (isFunction(context)) { context = context.call(this); }
 
     if (options.data) {
@@ -102,6 +114,10 @@ function registerDefaultHelpers(instance) {
             data.index = i;
             data.first = (i === 0);
             data.last  = (i === (context.length-1));
+
+            if (contextPath) {
+              data.contextPath = contextPath + i;
+            }
           }
           ret = ret + fn(context[i], { data: data });
         }
@@ -112,6 +128,10 @@ function registerDefaultHelpers(instance) {
               data.key = key;
               data.index = i;
               data.first = (i === 0);
+
+              if (contextPath) {
+                data.contextPath = contextPath + key;
+              }
             }
             ret = ret + fn(context[key], {data: data});
             i++;
@@ -147,7 +167,17 @@ function registerDefaultHelpers(instance) {
   instance.registerHelper('with', function(context, options) {
     if (isFunction(context)) { context = context.call(this); }
 
-    if (!Utils.isEmpty(context)) return options.fn(context);
+    var fn = options.fn;
+
+    if (!Utils.isEmpty(context)) {
+      if (options.ids) {
+        var data = createFrame(options.data);
+        data.contextPath = Utils.appendContextPath(options.data.contextPath, options.ids[0]);
+        options = {data:data};
+      }
+
+      return fn(context, options);
+    }
   });
 
   instance.registerHelper('log', function(context, options) {

lib/handlebars/utils.js

@@ -75,3 +75,7 @@ export function isEmpty(value) {
     return false;
   }
 }
+
+export function appendContextPath(contextPath, id) {
+  return (contextPath ? contextPath + '.' : '') + id;
+}

spec/track-ids.js

@@ -105,4 +105,59 @@ describe('track ids', function() {
 
     equals(template(context, {helpers: helpers}), 'HELP ME MY BOSS 1');
   });
+
+  describe('builtin helpers', function() {
+    var helpers = {
+      wycats: function(name, options) {
+        return name + ':' + options.data.contextPath + '\n';
+      }
+    };
+
+    describe('#each', function() {
+      it('should track contextPath for arrays', function() {
+        var template = CompilerContext.compile('{{#each array}}{{wycats name}}{{/each}}', {trackIds: true});
+
+        equals(template({array: [{name: 'foo'}, {name: 'bar'}]}, {helpers: helpers}), 'foo:array.0\nbar:array.1\n');
+      });
+      it('should track contextPath for keys', function() {
+        var template = CompilerContext.compile('{{#each object}}{{wycats name}}{{/each}}', {trackIds: true});
+
+        equals(template({object: {foo: {name: 'foo'}, bar: {name: 'bar'}}}, {helpers: helpers}), 'foo:object.foo\nbar:object.bar\n');
+      });
+      it('should handle nesting', function() {
+        var template = CompilerContext.compile('{{#each .}}{{#each .}}{{wycats name}}{{/each}}{{/each}}', {trackIds: true});
+
+        equals(template({array: [{name: 'foo'}, {name: 'bar'}]}, {helpers: helpers}), 'foo:.array..0\nbar:.array..1\n');
+      });
+    });
+    describe('#with', function() {
+      it('should track contextPath', function() {
+        var template = CompilerContext.compile('{{#with field}}{{wycats name}}{{/with}}', {trackIds: true});
+
+        equals(template({field: {name: 'foo'}}, {helpers: helpers}), 'foo:field\n');
+      });
+      it('should handle nesting', function() {
+        var template = CompilerContext.compile('{{#with bat}}{{#with field}}{{wycats name}}{{/with}}{{/with}}', {trackIds: true});
+
+        equals(template({bat: {field: {name: 'foo'}}}, {helpers: helpers}), 'foo:bat.field\n');
+      });
+    });
+    describe('#blockHelperMissing', function() {
+      it('should track contextPath for arrays', function() {
+        var template = CompilerContext.compile('{{#field}}{{wycats name}}{{/field}}', {trackIds: true});
+
+        equals(template({field: [{name: 'foo'}]}, {helpers: helpers}), 'foo:field.0\n');
+      });
+      it('should track contextPath for keys', function() {
+        var template = CompilerContext.compile('{{#field}}{{wycats name}}{{/field}}', {trackIds: true});
+
+        equals(template({field: {name: 'foo'}}, {helpers: helpers}), 'foo:field\n');
+      });
+      it('should handle nesting', function() {
+        var template = CompilerContext.compile('{{#bat}}{{#field}}{{wycats name}}{{/field}}{{/bat}}', {trackIds: true});
+
+        equals(template({bat: {field: {name: 'foo'}}}, {helpers: helpers}), 'foo:bat.field\n');
+      });
+    });
+  });
 });