chore(doc-gen): render decorators (annotations) for exported classes

Closes angular#3167
Closes angular#3221

Author: petebacondarwin

docs/angular.io-package/templates/class.template.html

@@ -10,6 +10,19 @@
 :markdown
 {$ doc.description | indent(2, true) $}
 
+{%- if doc.decorators %}
+.l-main-section
+  h2 Annotations
+{%- for decorator in doc.decorators %}
+  .l-sub-section
+    h3.annotation {$ decorator.name $}
+    pre.prettyprint
+      code.
+        @{$ decorator.name $}{$ paramList(decorator.arguments) | indent(8, false) $}
+{% endfor %}
+{% endif -%}
+
+
 {%- if doc.constructorDoc or doc.members.length -%}
 .l-main-section
   h2 Members

docs/docs-package/templates/class.template.html

@@ -9,6 +9,13 @@ <h1 class="class export">{$ doc.name $} <span class="type">{$ doc.docType $}</sp
 </p>
 <p>{$ doc.description | marked $}</p>
 
+{%- if doc.decorators %}
+<h2>Annotations</h2>
+{%- for decorator in doc.decorators %}
+  <h3 class="annotation">@{$ decorator.name $}{$ paramList(decorator.arguments) $}</h3>
+{% endfor %}
+{% endif -%}
+
 {%- if doc.constructorDoc or doc.members.length -%}
 <h2>Members</h2>
 

docs/typescript-package/processors/readTypeScriptModules.js

@@ -176,6 +176,7 @@ module.exports = function readTypeScriptModules(tsParser, modules, getFileInfo,
       id: moduleDoc.id + '/' + name,
       typeParams: typeParamString,
       heritage: heritageString,
+      decorators: getDecorators(exportSymbol),
       aliases: aliasNames,
       moduleDoc: moduleDoc,
       content: getContent(exportSymbol),
@@ -197,6 +198,7 @@ module.exports = function readTypeScriptModules(tsParser, modules, getFileInfo,
       docType: 'member',
       classDoc: classDoc,
       name: memberSymbol.name,
+      decorators: getDecorators(memberSymbol),
       content: getContent(memberSymbol),
       fileInfo: getFileInfo(memberSymbol, basePath),
       location: getLocation(memberSymbol)
@@ -240,6 +242,23 @@ module.exports = function readTypeScriptModules(tsParser, modules, getFileInfo,
     return memberDoc;
   }
 
+
+  function getDecorators(symbol) {
+    var declaration = symbol.valueDeclaration || symbol.declarations[0];
+    var sourceFile = ts.getSourceFileOfNode(declaration);
+
+    var decorators = declaration.decorators && declaration.decorators.map(function(decorator) {
+      decorator = decorator.expression;
+      return {
+        name: decorator.expression.text,
+        arguments: decorator.arguments && decorator.arguments.map(function(argument) {
+          return getText(sourceFile, argument).trim();
+        })
+      };
+    });
+    return decorators;
+  }
+
   function getParameters(typeChecker, symbol) {
     var declaration = symbol.valueDeclaration || symbol.declarations[0];
     var sourceFile = ts.getSourceFileOfNode(declaration);