Initial version of the new crafting table

src/scripts/models/recipe.coffee

@@ -16,7 +16,7 @@ module.exports = class Recipe extends BaseModel
         if not attributes.input? then throw new Error 'attributes.input is required'
         if not attributes.output? then throw new Error 'attributes.output is required'
 
-        attributes.pattern ?= (i for i in [0...attributes.input.length]).join('')
+        attributes.pattern ?= @_computeShapelessPattern attributes.input
         attributes.tools   ?= []
         super attributes, options
 
@@ -24,6 +24,15 @@ module.exports = class Recipe extends BaseModel
 
     # Public Methods ###############################################################################
 
+    getItemSlugAt: (index)->
+        patternDigit = @pattern[index]
+        return null unless patternDigit?
+
+        stack = @input[parseInt(patternDigit)]
+        return null unless stack?
+
+        return stack.itemSlug
+
     make: (inventory, missing)->
         for stack in @input
             itemSlug = stack.itemSlug
@@ -71,3 +80,13 @@ module.exports = class Recipe extends BaseModel
 
         result.push '}'
         return result.join ''
+
+    # Private Methods ##############################################################################
+
+    _computeShapelessPattern: (input)->
+        result = []
+        for i in [0...input.length]
+            stack = input[i]
+            for j in [0...stack.quantity]
+                result.push "#{i}"
+        return result.join ''