Adding anonymous class support (gets a temporary variable for a name.) Issue #548

lib/grammar.js

@@ -226,6 +226,8 @@
         return new ClassNode($2, null, $4);
       }), o("CLASS SimpleAssignable EXTENDS Value INDENT ClassBody OUTDENT", function() {
         return new ClassNode($2, $4, $6);
+      }), o("CLASS INDENT ClassBody OUTDENT", function() {
+        return new ClassNode('__temp__', null, $3);
       })
     ],
     ClassAssign: [

lib/nodes.js

@@ -94,7 +94,7 @@
     };
     BaseNode.prototype.containsPureStatement = function() {
       return this.isPureStatement() || this.contains(function(n) {
-        return n.isPureStatement();
+        return n.isPureStatement && n.isPureStatement();
       });
     };
     BaseNode.prototype.traverse = function(block) {
@@ -756,6 +756,9 @@
     };
     ClassNode.prototype.compileNode = function(o) {
       var _b, _c, _d, _e, access, applied, className, constScope, construct, constructor, extension, func, me, pname, prop, props, pvar, returns, val;
+      if (this.variable === '__temp__') {
+        this.variable = literal(o.scope.freeVariable());
+      }
       extension = this.parent && new ExtendsNode(this.variable, this.parent);
       props = new Expressions();
       o.top = true;

src/grammar.coffee

@@ -277,6 +277,7 @@ grammar = {
     o "CLASS SimpleAssignable EXTENDS Value",   -> new ClassNode $2, $4
     o "CLASS SimpleAssignable INDENT ClassBody OUTDENT", -> new ClassNode $2, null, $4
     o "CLASS SimpleAssignable EXTENDS Value INDENT ClassBody OUTDENT", -> new ClassNode $2, $4, $6
+    o "CLASS INDENT ClassBody OUTDENT",         -> new ClassNode '__temp__', null, $3
   ]
 
   # Assignments that can happen directly inside a class declaration.

src/nodes.coffee

@@ -104,7 +104,7 @@ exports.BaseNode = class BaseNode
   # Convenience for the most common use of contains. Does the node contain
   # a pure statement?
   containsPureStatement: ->
-    @isPureStatement() or @contains (n) -> n.isPureStatement()
+    @isPureStatement() or @contains (n) -> n.isPureStatement and n.isPureStatement()
 
   # Perform an in-order traversal of the AST. Crosses scope boundaries.
   traverse: (block) -> @traverseChildren true, block
@@ -688,6 +688,7 @@ exports.ClassNode = class ClassNode extends BaseNode
   # equivalent syntax tree and compile that, in pieces. You can see the
   # constructor, property assignments, and inheritance getting built out below.
   compileNode: (o) ->
+    @variable  = literal o.scope.freeVariable() if @variable is '__temp__'
     extension  = @parent and new ExtendsNode(@variable, @parent)
     props      = new Expressions
     o.top      = true

test/test_classes.coffee

@@ -218,3 +218,12 @@ func class Test
 
 ok (new Test).prop  is 'value'
 ok (new Test).prop2 is 'value2'
+
+
+# Test anonymous classes.
+obj =
+  klass: class
+    method: -> 'value'
+
+instance = new obj.klass
+ok instance.method() is 'value'