Add visitor pattern to crafting nodes

src/coffee/models/crafting/crafting_node.coffee

@@ -29,6 +29,24 @@ module.exports = class CraftingNode
             queue.push child
         return queue
 
+    acceptVisitor: (visitor)->
+        enter = visitor[@ENTER_METHOD]
+        if enter?
+            enter.call visitor, this
+        else
+            enter = visitor['onEnterOtherNode']
+            if enter? then enter.call visitor, this
+
+        for child in @_children
+            child.acceptVisitor visitor
+
+        leave = visitor[@LEAVE_METHOD]
+        if leave?
+            leave.call visitor, this
+        else
+            leave = visitor['onLeaveOtherNode']
+            if leave? then leave.call visitor, this
+
     # Property Methods #############################################################################
 
     getChildren: ->

src/coffee/models/crafting/inventory_node.coffee

@@ -12,6 +12,9 @@ ItemNode     = require './item_node'
 
 module.exports = class InventoryNode extends CraftingNode
 
+    @::ENTER_METHOD = 'onEnterInventoryNode'
+    @::LEAVE_METHOD = 'onLeaveInventoryNode'
+
     constructor: (options={})->
         if not options.inventory? then throw new Error 'options.inventory is required'
         super options
@@ -38,10 +41,14 @@ module.exports = class InventoryNode extends CraftingNode
 
     # Object Overrides #############################################################################
 
-    toString: (indent='')->
+    toString: (options={})->
+        options.indent ?= ''
+        options.recursive ?= true
+
         completeText = if @complete then 'complete' else 'incomplete'
-        parts = ["#{indent}#{@completeText} InventoryNode for #{@inventory}"]
-        nextIndent = indent + '    '
-        for child in @children
-            parts.push child.toString nextIndent
+        parts = ["#{options.indent}#{@completeText} InventoryNode for #{@inventory}"]
+        nextIndent = options.indent + '    '
+        if options.recursive
+            for child in @children
+                parts.push child.toString indent:nextIndent
         return parts.join '\n'

src/coffee/models/crafting/item_node.coffee

@@ -12,6 +12,9 @@ RecipeNode   = require './recipe_node'
 
 module.exports = class ItemNode extends CraftingNode
 
+    @::ENTER_METHOD = 'onEnterItemNode'
+    @::LEAVE_METHOD = 'onLeaveItemNode'
+
     constructor: (options={})->
         if not options.item? then throw new Error 'options.item is required'
         super options
@@ -60,10 +63,14 @@ module.exports = class ItemNode extends CraftingNode
 
     # Object Overrides #############################################################################
 
-    toString: (indent)->
+    toString: (options={})->
+        options.indent ?= ''
+        options.recursive ?= true
+
         completeText = if @complete then 'complete' else 'incomplete'
-        parts = ["#{indent}#{@completeText} ItemNode for #{@item.name}"]
-        nextIndent = indent + '    '
-        for child in @children
-            parts.push child.toString nextIndent
+        parts = ["#{options.indent}#{@completeText} ItemNode for #{@item.name}"]
+        nextIndent = options.indent + '    '
+        if options.recursive
+            for child in @children
+                parts.push child.toString indent:nextIndent
         return parts.join '\n'

src/coffee/models/crafting/recipe_node.coffee

@@ -12,6 +12,9 @@ CraftingNode = require './crafting_node'
 
 module.exports = class RecipeNode extends CraftingNode
 
+    @::ENTER_METHOD = 'onEnterRecipeNode'
+    @::LEAVE_METHOD = 'onLeaveRecipeNode'
+
     constructor: (options={})->
         if not options.recipe? then throw new Error 'options.recipe is required'
         super options
@@ -52,10 +55,14 @@ module.exports = class RecipeNode extends CraftingNode
 
     # Object Overrides ############################################################################
 
-    toString: (indent)->
+    toString: (options={})->
+        options.indent ?= ''
+        options.recursive ?= true
+
         completeText = if @complete then 'complete' else 'incomplete'
-        parts = ["#{indent}#{@completeText} RecipeNode for #{@recipe.slug}"]
-        nextIndent = indent + '    '
-        for child in @children
-            parts.push child.toString nextIndent
+        parts = ["#{options.indent}#{@completeText} RecipeNode for #{@recipe.slug}"]
+        nextIndent = options.indent + '    '
+        if options.recursive
+            for child in @children
+                parts.push child.toString indent:nextIndent
         return parts.join '\n'