Inverse should really be its own node, as it has totally different runtime semantics

lib/handlebars/ast.js

@@ -21,11 +21,16 @@ Handlebars.AST.PartialNode = function(id, context) {
   this.context = context;
 };
 
-Handlebars.AST.BlockNode = function(mustache, program, inverted) {
+Handlebars.AST.BlockNode = function(mustache, program) {
   this.type = "block";
   this.mustache = mustache;
   this.program  = program;
-  this.inverted = inverted;
+};
+
+Handlebars.AST.InverseNode = function(mustache, program) {
+  this.type = "inverse";
+  this.mustache = mustache;
+  this.program  = program;
 };
 
 Handlebars.AST.ContentNode = function(string) {

lib/handlebars/printer.js

@@ -50,7 +50,7 @@ Handlebars.PrintVisitor.prototype.program = function(program) {
 Handlebars.PrintVisitor.prototype.block = function(block) {
   var out = "";
 
-  out = out + (block.inverted ? this.pad("INVERSE:") : this.pad("BLOCK:"));
+  out = out + this.pad("BLOCK:");
   this.padding++;
   out = out + this.accept(block.mustache);
   out = out + this.accept(block.program);
@@ -59,6 +59,19 @@ Handlebars.PrintVisitor.prototype.block = function(block) {
   return out;
 };
 
+Handlebars.PrintVisitor.prototype.inverse = function(block) {
+  var out = "";
+
+  out = out + this.pad("INVERSE:");
+  this.padding++;
+  out = out + this.accept(block.mustache);
+  out = out + this.accept(block.program);
+  this.padding--;
+
+  return out;
+};
+
+
 Handlebars.PrintVisitor.prototype.mustache = function(mustache) {
   var params = mustache.params, paramStrings = [];
 

spec/parser_spec.rb

@@ -55,8 +55,13 @@ describe "Parser" do
       with_padding { yield }
     end
 
-    def block(inverse = false)
+    def block
-      inverse ? pad("INVERSE:") : pad("BLOCK:")
+      pad("BLOCK:")
+      with_padding { yield }
+    end
+
+    def inverted_block
+      pad("INVERSE:")
       with_padding { yield }
     end
 
@@ -150,7 +155,7 @@ describe "Parser" do
 
   it "parses a standalone inverse section" do
     ast_for("{{^foo}}bar{{/baz}}").should == program do
-      block true do
+      inverted_block do
         mustache id("foo")
 
         program do

src/handlebars.yy

@@ -18,8 +18,8 @@ statements
   ;
 
 statement
-  : openInverse program closeBlock { $$ = new yy.BlockNode($1, $2, true) }
+  : openInverse program closeBlock { $$ = new yy.InverseNode($1, $2) }
-  | openBlock program closeBlock { $$ = new yy.BlockNode($1, $2, false) }
+  | openBlock program closeBlock { $$ = new yy.BlockNode($1, $2) }
   | mustache { $$ = $1 }
   | partial { $$ = $1 }
   | CONTENT { $$ = new yy.ContentNode($1) }