Fix support for multiblock recipes

src/client/models/site/multiblock_display.coffee

@@ -0,0 +1,53 @@
+#
+# Crafting Guide - multiblock_display.coffee
+#
+# Copyright © 2014-2017 by Redwood Labs
+# All rights reserved.
+#
+
+{Inventory} = require("crafting-guide-common").models
+{Observable} = require("crafting-guide-common").util
+
+########################################################################################################################
+
+module.exports = class MultiblockDisplay extends Observable
+
+    constructor: (recipe)->
+        @_layerInventories = []
+        @recipe = recipe
+
+    # Properties ###################################################################################
+    
+    Object.defineProperties @prototype,
+
+        recipe:
+            get: -> return @_recipe
+            set: (recipe)->
+                if not recipe? then throw new Error "recipe is required"
+                if @_recipe? then throw new Error "recipe cannot be reassigned"
+                @_recipe = recipe
+
+    # Public Methods ###############################################################################
+    
+    getInventory: (z)->
+        if not z?
+            return @_fullInventory ?= @_createFullInventory()
+        else
+            return @_layerInventories[z] ?= @_addLayerInventory z
+    
+    # Private Methods ##############################################################################
+
+    _addLayerInventory: (z, inventory=null)->
+        inventory ?= new Inventory
+        for x in [0..@recipe.width]
+            for y in [0..@recipe.height]
+                stack = @recipe.getInputAt x, y, z
+                continue unless stack?
+                inventory.add stack.item, stack.quantity
+        return inventory
+    
+    _createFullInventory: (inventory=null)->
+        inventory ?= new Inventory()
+        for z in [0..@recipe.depth]
+            @_addLayerInventory z, inventory
+        return inventory