Initial version

crafting.js

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+// Constants //////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+var FADE_DURATION = 250; // ms
+var ERROR_DISPLAY_DURATION = 5000; // ms
+
+// UI Functions ///////////////////////////////////////////////////////////////////////////////////////////////////////
+
+function onPageLoad() {
+    $("#recipe_load_button").click(onRecipeLoadButtonClicked);
+    $("#crafting_selector").change(onCraftingSelectorChanged);
+
+    loadRecipes("vanilla.json");
+}
+
+function onCraftingSelectorChanged() {
+    var recipeName = $("#crafting_selector option:selected").val();
+    var recipe = __recipes[recipeName];
+    if (recipe === undefined) {
+        $("#crafting_error").html("Cannot find recipe for " + recipeName);
+        $("#crafting_error").fadeIn(FADE_DURATION).delay(ERROR_DISPLAY_DURATION).fadeOut(FADE_DURATION);
+    } else {
+        var inventory = createManifest();
+        var missingMaterials = recipe.computeMissingMaterials(inventory);
+        $("#missing_materials").html(missingMaterials.toHtml());
+        $("#leftover_materials").html(inventory.toHtml());
+        $("#crafting_output").fadeIn(FADE_DURATION);
+    }
+}
+
+function onRecipeLoadButtonClicked() {
+    loadRecipes($("#recipe_url").val());
+}
+
+// UI Helper Functions ////////////////////////////////////////////////////////////////////////////////////////////////
+
+function loadRecipes(recipeUrl) {
+    $.ajax({
+        url: recipeUrl,
+        dataType: "text",
+        success: function(data) {
+            try {
+                recipeData = $.parseJSON(data)["recipes"];
+                __recipes = parseRecipeData(recipeData);
+                $("#loaded_recipes ul").append("<li><a href=\"" + recipeUrl + "\">" + recipeUrl + "</a></li>");
+                $("#loaded_recipes").fadeIn(FADE_DURATION);
+
+                updateCraftingSelector();
+                $("#crafting").fadeIn(FADE_DURATION);
+            } catch (e) {
+                $("#load_error").html(e);
+                $("#load_error").slideDown(FADE_DURATION).delay(ERROR_DISPLAY_DURATION).slideUp(FADE_DURATION);
+            }
+        },
+        error: function(response, status, error) {
+            $("#load_error").html(error);
+            $("#load_error").slideDown(FADE_DURATION).delay(ERROR_DISPLAY_DURATION).slideUp(FADE_DURATION);
+        }
+    });
+}
+
+function updateCraftingSelector() {
+    var $selector = $("#crafting_selector");
+    if (__recipes.length == 0) {
+        $selector.attr("disabled", "disabled");
+    } else {
+        for (var name in __recipes) {
+            if (!__recipes.hasOwnProperty(name)) continue;
+            $selector.append("<option value=\"" + name + "\">" + name + "</option>");
+        }
+        $selector.removeAttr("disabled");
+    }
+}
+
+// Manifest Object ////////////////////////////////////////////////////////////////////////////////////////////////////
+
+function createManifest() {
+    var object = {materials: {}};
+
+    object.add = function(count, name) {
+        if (object.materials[name] === undefined) {
+            object.materials[name] = count;
+        } else {
+            object.materials[name] = object.materials[name] + count;
+        }
+    };
+
+    object.contains = function(count, name) {
+        if (object.materials[name] === undefined) return false;
+        return (object.materials[name] >= count);
+    };
+
+    object.remove = function(count, name) {
+        if (object.materials[name] !== undefined) {
+            if (object.materials[name] <= count) {
+                delete object.materials[name]
+            } else {
+                object.materials[name] -= count;
+            }
+        }
+    };
+
+    object.toHtml = function() {
+        var result = "";
+        var count = 0;
+        for (var name in object.materials) {
+            result += "<li>" + object.materials[name] + " " + name + "</li>";
+            count += 1
+        }
+
+        if (count === 0) result = "<li class=\"disabled\">Nothing</li>";
+        return result;
+    };
+
+    return object;
+}
+
+// Recipe Object //////////////////////////////////////////////////////////////////////////////////////////////////////
+
+function parseRecipeData(recipeData) {
+    var recipes = {};
+    $.each(recipeData, function(i, data) {
+        var recipe = createRecipe(data);
+        $.each(recipe.output, function(j, output) {
+            recipes[output.name] = recipe
+        });
+    });
+    return recipes;
+}
+
+function createRecipe(data) {
+    var object = {output: [], input: [], tools: data.tools};
+
+    $.each(data.output, function(index, value) {
+        object.output.push({count: value[0], name: value[1]});
+    });
+
+    $.each(data.input, function(index, value) {
+        object.input.push({count: value[0], name: value[1]});
+    });
+
+    // Methods ////////////////////////////////////////////
+
+    object.computeMissingMaterials = function(inventory) {
+        if (inventory === undefined) inventory = createManifest();
+        var missingMaterials = createManifest();
+        var queue = [];
+
+        function craftItem(ingredient) {
+            var recipe = __recipes[ingredient.name];
+            if (recipe === undefined) {
+                missingMaterials.add(1, ingredient.name);
+                ingredient.count -= 1
+            } else {
+                $.each(recipe.input, function(j, childIngredient) {
+                    queue.push({count: childIngredient.count, name: childIngredient.name});
+                });
+                $.each(recipe.output, function(j, childProduct) {
+                    inventory.add(childProduct.count, childProduct.name);
+                });
+                $.each(recipe.tools, function(j, tool) {
+                    if (! inventory.contains(1, tool)) {
+                        craftItem({count: 1, name: tool});
+                    }
+                });
+            }
+            return recipe;
+        }
+
+        craftItem({count: 1, name: object.output[0].name});
+
+        while (queue.length > 0) {
+            var ingredient = queue.shift();
+            while (ingredient.count > 0) {
+                if (inventory.contains(1, ingredient.name)) {
+                    inventory.remove(1, ingredient.name);
+                    ingredient.count -= 1;
+                } else {
+                    craftItem(ingredient);
+                }
+            }
+        }
+
+        return missingMaterials;
+    }
+
+    return object;
+}

index.html

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+<!doctype html5!>
+<html>
+  <head>
+    <style>
+      .disabled { color: gray; }
+      #craft_button { margin-left: 10px; width: 90px; }
+      #crafting { display: none; }
+      #crafting_error { color: red; display: none; font-weight: bold; width: 100%; }
+      #crafting_output { display: none; }
+      #item_to_craft { width: 540px; }
+      #load_error { color: red; display: none; font-weight: bold; width: 100%; }
+      #loaded_recipes { display: none; }
+      #recipe_url { width: 540px; }
+      #recipe_load_button { margin-left: 10px; width: 90px; }
+      div { margin-top: 50px; }
+    </style>
+  </head>
+  <body>
+    <div id="recipes">
+      <h1>Recipes</h1>
+      <p>
+        <input id="recipe_url" placeholder="recipe URL"></input>
+        <button id="recipe_load_button">Load</button>
+        <p id="load_error"></p>
+        <div id="loaded_recipes">
+          <p>Loaded recipes:</p>
+          <ul></ul>
+        </div>
+      </p>
+    </div>
+
+    <div id="crafting">
+      <h1>Crafting</h1>
+      <select id="crafting_selector" disabled></select>
+      <div id="crafting_output">
+        <p>You'll need:</p>
+        <ul id="missing_materials"></ul>
+        <p>You'll get:</p>
+        <ul id="leftover_materials"></ul>
+      </div>
+      <div id="crafting_error"></div>
+    </div>
+
+    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
+    <script src="crafting.js"></script>
+    <script>
+      var __recipes = {};
+      var __inventory = {};
+      $(function() { onPageLoad() })
+    </script>
+  </body>
+</html>
+

vanilla.json

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+
+{
+    "recipes": [
+        {
+            "output": [[1, "Boat"]],
+            "input": [[5, "Oak Plank"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Crafting Table"]],
+            "input": [[4, "Oak Plank"]],
+            "tools": []
+        }, {
+            "output": [[1, "Furnace"]],
+            "input": [[8, "Cobblestone"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Iron Ingot"]],
+            "input": [[1, "Iron Ore"], [1, "Furnace Fuel"]],
+            "tools": ["Furnace"]
+        }, {
+            "output": [[1, "Iron Ax"]],
+            "input": [[3, "Iron Ingot"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Iron Hoe"]],
+            "input": [[2, "Iron Ingot"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Iron Pick"]],
+            "input": [[3, "Iron Ingot"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Iron Sword"]],
+            "input": [[2, "Iron Ingot"], [1, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[4, "Oak Plank"]],
+            "input": [[1, "Oak Log"]],
+            "tools": []
+        }, {
+            "output": [[4, "Stick"]],
+            "input": [[2, "Oak Plank"]],
+            "tools": []
+        }, {
+            "output": [[1, "Stone Ax"]],
+            "input": [[3, "Cobblestone"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Stone Hoe"]],
+            "input": [[2, "Cobblestone"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Stone Pick"]],
+            "input": [[3, "Cobblestone"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Stone Sword"]],
+            "input": [[2, "Cobblestone"], [1, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Wooden Ax"]],
+            "input": [[3, "Oak Plank"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Wooden Hoe"]],
+            "input": [[2, "Oak Plank"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Wooden Pick"]],
+            "input": [[3, "Oak Plank"], [2, "Stick"]],
+            "tools": ["Crafting Table"]
+        }, {
+            "output": [[1, "Wooden Sword"]],
+            "input": [[2, "Oak Plank"], [1, "Stick"]],
+            "tools": ["Crafting Table"]
+        }
+    ]
+}
+