thodg/libgit2

diff --git a/src/userdiff.h b/src/userdiff.h
index 523f2f8..91c1f42 100644
--- a/src/userdiff.h
+++ b/src/userdiff.h
@@ -191,9 +191,9 @@ PATTERNS("php",
 	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 
 PATTERNS("javascript",
-	 "^[ \t]*(function[ \t][a-zA-Z_][^\\{]*)\n"
-	 "^[ \t]*(var[ \t]+[a-zA-Z_][a-zA-Z0-9_]*[ \t]*=[ \t]*function[ \t\\(][^\\{]*)\n"
-	 "^[ \t]*([a-zA-Z_][a-zA-Z0-9_]*[ \t]*:[ \t]*function[ \t\\(][^\\{]*)",
+	 "([a-zA-Z_$][a-zA-Z0-9_$]*(\\.[a-zA-Z0-9_$]+)*[ \t]*=[ \t]*function([ \t][a-zA-Z_$][a-zA-Z0-9_$]*)?[^\\{]*)\n"
+	 "([a-zA-Z_$][a-zA-Z0-9_$]*[ \t]*:[ \t]*function([ \t][a-zA-Z_$][a-zA-Z0-9_$]*)?[^\\{]*)\n"
+	 "[^a-zA-Z0-9_\\$](function([ \t][a-zA-Z_$][a-zA-Z0-9_$]*)?[^\\{]*)",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[fFlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
diff --git a/tests/resources/userdiff/.gitted/index b/tests/resources/userdiff/.gitted/index
index b69d5cf..548dc7b 100644
Binary files a/tests/resources/userdiff/.gitted/index and b/tests/resources/userdiff/.gitted/index differ
diff --git a/tests/resources/userdiff/.gitted/objects/09/65b377c214bbe5e0d18fcdaf556df7fa7ed7c8 b/tests/resources/userdiff/.gitted/objects/09/65b377c214bbe5e0d18fcdaf556df7fa7ed7c8
new file mode 100644
index 0000000..cbaf4c1
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/09/65b377c214bbe5e0d18fcdaf556df7fa7ed7c8 differ
diff --git a/tests/resources/userdiff/.gitted/objects/0c/20ef1409ae1df4d5a76cdbd98d5c33ccdb6bcc b/tests/resources/userdiff/.gitted/objects/0c/20ef1409ae1df4d5a76cdbd98d5c33ccdb6bcc
new file mode 100644
index 0000000..fa149da
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/0c/20ef1409ae1df4d5a76cdbd98d5c33ccdb6bcc differ
diff --git a/tests/resources/userdiff/.gitted/objects/39/ea75107a09091ba54ff86fcc780b59477e42cd b/tests/resources/userdiff/.gitted/objects/39/ea75107a09091ba54ff86fcc780b59477e42cd
new file mode 100644
index 0000000..7483736
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/39/ea75107a09091ba54ff86fcc780b59477e42cd differ
diff --git a/tests/resources/userdiff/.gitted/objects/3c/c08384deae5957247bc36776ab626cc9e0582b b/tests/resources/userdiff/.gitted/objects/3c/c08384deae5957247bc36776ab626cc9e0582b
new file mode 100644
index 0000000..29b72fb
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/3c/c08384deae5957247bc36776ab626cc9e0582b differ
diff --git a/tests/resources/userdiff/.gitted/objects/46/8d6f2afc940e14c76347fa9af26e429a3c9044 b/tests/resources/userdiff/.gitted/objects/46/8d6f2afc940e14c76347fa9af26e429a3c9044
new file mode 100644
index 0000000..5fc8391
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/46/8d6f2afc940e14c76347fa9af26e429a3c9044 differ
diff --git a/tests/resources/userdiff/.gitted/objects/53/917973acfe0111f93c2cfaacf854be245880e8 b/tests/resources/userdiff/.gitted/objects/53/917973acfe0111f93c2cfaacf854be245880e8
new file mode 100644
index 0000000..debf7e4
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/53/917973acfe0111f93c2cfaacf854be245880e8 differ
diff --git a/tests/resources/userdiff/.gitted/objects/63/1d44e0c72e8cd1b594fa11d7d1ee8a6d67ff67 b/tests/resources/userdiff/.gitted/objects/63/1d44e0c72e8cd1b594fa11d7d1ee8a6d67ff67
new file mode 100644
index 0000000..e8b884c
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/63/1d44e0c72e8cd1b594fa11d7d1ee8a6d67ff67 differ
diff --git a/tests/resources/userdiff/.gitted/objects/f3/be389d351e4bcc6dcc4b5fe22134ef0f63f8bd b/tests/resources/userdiff/.gitted/objects/f3/be389d351e4bcc6dcc4b5fe22134ef0f63f8bd
new file mode 100644
index 0000000..cfbef99
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/f3/be389d351e4bcc6dcc4b5fe22134ef0f63f8bd differ
diff --git a/tests/resources/userdiff/after/file.javascript b/tests/resources/userdiff/after/file.javascript
index 7cd3c5a..5391797 100644
--- a/tests/resources/userdiff/after/file.javascript
+++ b/tests/resources/userdiff/after/file.javascript
@@ -1,108 +1,108 @@
-/*
-  Some code extracted from https://github.com/julianlloyd/scrollReveal.js
-  which happens to be a trending Javascript repo with an MIT license at
-  the time I was working on Javascript userdiff support in libgit2
+define(function(require, exports, module) {
+  module.exports = Player;
 
-  I extracted just some of the code, so I suspect this is no longer valid
-  Javascript code, but it contains enough example patterns to work.
-*/
-;(function (window) {
+  var Key = require("./key")
+    , Direction = require("./direction");
 
-  'use strict';
+  function Player(game) {
+    this.game = game;
 
-  var docElem = window.document.documentElement;
+    this.image = new Image("./assets/fighter.png");
+    this.game.resources.add(this.image);
 
-  function getViewportH () {
-    var client = docElem['clientHeight'],
-      inner = window['innerHeight'],
-      sample = window['otherProperty'];
+    this.x = 0;
+    this.y = 0;
 
-    return (client < inner) ? inner : client;
-  }
-
-  function getOffset (el) {
-    var offsetTop = 0,
-        offsetLeft = 0;
+    this.pixelX = 10;
+    this.pixelY = 10;
 
-    do {
-      if (!isNaN(el.offsetTop)) {
-        offsetTop += el.offsetTop + 1;
-      }
-      if (!isNaN(el.offsetLeft)) {
-        offsetLeft += el.offsetLeft;
-      }
-    } while (el = el.offsetParent)
-
-    return {
-      top: offsetTop,
-      left: offsetLeft
-    }
+    this.animationStep = 0;
   }
 
-  function isElementInViewport (el, h) {
-    var scrolled = window.pageYOffset,
-        viewed = scrolled + getViewportH(),
-        elTop = getOffset(el).top,
-        elBottom = elTop + el.offsetHeight,
-        h = h || 0;
-
-    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
-  }
-
-  scrollReveal.prototype = {
-
-    _init: function () {
-
-      var self = this;
-
-      this.elems = Array.prototype.slice.call(docElem.querySelectorAll('[data-scrollReveal]'));
-      this.scrolled = false;
+  Player.prototype.update = function() {
+    if (!this.isWalking()) {
+      this.handleInput();
+    }
 
-      this.elems.forEach(function (el, i) {
-        self.animate(el);
-      });
+    if (this.isWalking()) {
+      // Increase the animation step.
+      this.animationStep = ++this.animationStep % 60;
 
-      var scrollHandler = function () {
-        if (!self.scrolled) {
-          self.scrolled = true;
-          setTimeout(function () {
-            self._scrollPage();
-          }, 61);
-        }
-      };
+      if (this.x * 32 > this.pixelX) {
+        this.pixelX++;
+      } else if (this.x * 32 < this.pixelX) {
+        this.pixelX--;
+      }
 
-      var resizeHandler = function () {
-        function delayed() {
-          self._scrollPage();
-          self.resizeTimeout = null;
-        }
-        if (self.resizeTimeout) {
-          clearTimeout(self.resizeTimeout);
+      if (this.y * 32 > this.pixelY) {
+        this.pixelY++;
+      } else if (this.y * 32 < this.pixelY) {
+        this.pixelY--;
+      }
+    } else {
+      // Reset the animation step.
+      this.animationStep = 0;
+    }
+  };
+
+  Player.prototype.handleInput = function() {
+    var keyboard = this.game.keyboard, finalAction, action, inputs = {
+      'moveDown': keyboard.isDown(Key.DOWN),
+      'moveUp': keyboard.isDown(Key.UP),
+      'moveLeft': keyboard.isDown(Key.LEFT),
+      'moveRight': keyboard.isDown(Key.RIGHT)
+    };
+
+    for (action in inputs) {
+      if (inputs[action]) {
+        if (!finalAction || inputs[finalAction] < inputs[action]) {
+          finalAction = action;
         }
-        self.resizeTimeout = setTimeout(delayed, 200);
-      };
-
-      window.addEventListener('scroll', scrollHandler, false);
-      window.addEventListener('resize', resizeHandler, false);
-    },
-
-    /*=============================================================================*/
-
-    _scrollPage: function () {
-        var self = this;
-
-        this.elems.forEach(function (el, i) {
-            if (isElementInViewport(el, self.options.viewportFactor)) {
-                self.animate(el);
-            }
-        });
-        this.scrolled = false;
-		this.tested = true;
-    },
-  }; // end scrollReveal.prototype
+      }
+    }
 
-  document.addEventListener("DOMContentLoaded", function (evt) {
-    window.scrollReveal = new scrollReveal();
-  });
+    this[finalAction] && this[finalAction]();
+  };
+
+  Player.prototype.isWalking = function() {
+    return this.x * 32 != this.pixelX || this.y * 32 != this.pixelY;
+  };
+
+  Player.prototype.moveDown = function() {
+    this.y += 1;
+    this.direction = Direction.DOWN;
+  };
+
+  Player.prototype.moveUp = function() {
+    this.y -= 1;
+    this.direction = Direction.UP;
+  };
+
+  Player.prototype.moveLeft = function() {
+    this.x -= 5;
+    this.direction = Direction.LEFT;
+  };
+
+  Player.prototype.moveRight = function() {
+    this.x += 1;
+    this.direction = Direction.RIGHT;
+  };
+
+  Player.prototype.draw = function(context) {
+    var offsetX = Math.floor(this.animationStep / 15) * 32, offsetY = 0;
+
+    switch(this.direction) {
+      case Direction.UP:
+        offsetY = 48 * 3;
+        break;
+      case Direction.RIGHT:
+        offsetY = 48 * 2;
+        break;
+      case Direction.LEFT:
+        offsetY = 48;
+        break;
+    }
 
-})(window);
+    context.drawImage(this.image.data, offsetX, offsetY, 32, 48, this.pixelX, this.pixelY, 32, 48);
+  };
+});
diff --git a/tests/resources/userdiff/before/file.javascript b/tests/resources/userdiff/before/file.javascript
index b9f1286..0965b37 100644
--- a/tests/resources/userdiff/before/file.javascript
+++ b/tests/resources/userdiff/before/file.javascript
@@ -1,109 +1,109 @@
-/*
-  Some code extracted from https://github.com/julianlloyd/scrollReveal.js
-  which happens to be a trending Javascript repo with an MIT license at
-  the time I was working on Javascript userdiff support in libgit2
+define(function(require, exports, module) {
+  module.exports = Player;
 
-  I extracted just some of the code, so I suspect this is no longer valid
-  Javascript code, but it contains enough example patterns to work.
-*/
-;(function (window) {
+  var Key = require("./key")
+    , Direction = require("./direction")
+    , Image = require("./image");
 
-  'use strict';
+  function Player(game) {
+    this.game = game;
 
-  var docElem = window.document.documentElement;
+    this.image = new Image("./assets/fighter.png");
+    this.game.resources.add(this.image);
 
-  function getViewportH () {
-    var client = docElem['clientHeight'],
-      inner = window['innerHeight'];
+    this.x = 0;
+    this.y = 0;
 
-    return (client < inner) ? inner : client;
-  }
-
-  function getOffset (el) {
-    var offsetTop = 0,
-        offsetLeft = 0;
+    this.pixelX = 0;
+    this.pixelY = 0;
 
-    do {
-      if (!isNaN(el.offsetTop)) {
-        offsetTop += el.offsetTop;
-      }
-      if (!isNaN(el.offsetLeft)) {
-        offsetLeft += el.offsetLeft;
-      }
-    } while (el = el.offsetParent)
-
-    return {
-      top: offsetTop,
-      left: offsetLeft
-    }
+    this.animationStep = 0;
   }
 
-  function isElementInViewport (el, h) {
-    var scrolled = window.pageYOffset,
-        viewed = scrolled + getViewportH(),
-        elH = el.offsetHeight,
-        elTop = getOffset(el).top,
-        elBottom = elTop + elH,
-        h = h || 0;
-
-    return (elTop + elH * h) <= viewed && (elBottom) >= scrolled;
-  }
-
-  scrollReveal.prototype = {
-
-    _init: function () {
-
-      var self = this;
-
-      this.elems = Array.prototype.slice.call(docElem.querySelectorAll('[data-scrollReveal]'));
-      this.scrolled = false;
+  Player.prototype.update = function() {
+    if (!this.isWalking()) {
+      this.handleInput();
+    }
 
-  //  Initialize all scrollreveals, triggering all
-  //  reveals on visible elements.
-      this.elems.forEach(function (el, i) {
-        self.animate(el);
-      });
+    if (this.isWalking()) {
+      // Increase the animation step.
+      this.animationStep = ++this.animationStep % 60;
 
-      var scrollHandler = function () {
-        if (!self.scrolled) {
-          self.scrolled = true;
-          setTimeout(function () {
-            self._scrollPage();
-          }, 60);
-        }
-      };
+      if (this.x * 32 > this.pixelX) {
+        this.pixelX++;
+      } else if (this.x * 32 < this.pixelX) {
+        this.pixelX--;
+      }
 
-      var resizeHandler = function () {
-        function delayed() {
-          self._scrollPage();
-          self.resizeTimeout = null;
-        }
-        if (self.resizeTimeout) {
-          clearTimeout(self.resizeTimeout);
+      if (this.y * 32 > this.pixelY) {
+        this.pixelY++;
+      } else if (this.y * 32 < this.pixelY) {
+        this.pixelY--;
+      }
+    } else {
+      // Reset the animation step.
+      this.animationStep = 0;
+    }
+  };
+
+  Player.prototype.handleInput = function() {
+    var keyboard = this.game.keyboard, finalAction, action, inputs = {
+      'moveDown': keyboard.isDown(Key.DOWN),
+      'moveUp': keyboard.isDown(Key.UP),
+      'moveLeft': keyboard.isDown(Key.LEFT),
+      'moveRight': keyboard.isDown(Key.RIGHT)
+    };
+
+    for (action in inputs) {
+      if (inputs[action]) {
+        if (!finalAction || inputs[finalAction] < inputs[action]) {
+          finalAction = action;
         }
-        self.resizeTimeout = setTimeout(delayed, 200);
-      };
-
-      window.addEventListener('scroll', scrollHandler, false);
-      window.addEventListener('resize', resizeHandler, false);
-    },
-
-    /*=============================================================================*/
-
-    _scrollPage: function () {
-        var self = this;
-
-        this.elems.forEach(function (el, i) {
-            if (isElementInViewport(el, self.options.viewportFactor)) {
-                self.animate(el);
-            }
-        });
-        this.scrolled = false;
-    },
-  }; // end scrollReveal.prototype
+      }
+    }
 
-  document.addEventListener("DOMContentLoaded", function (evt) {
-    window.scrollReveal = new scrollReveal();
-  });
+    this[finalAction] && this[finalAction]();
+  };
+
+  Player.prototype.isWalking = function() {
+    return this.x * 32 != this.pixelX || this.y * 32 != this.pixelY;
+  };
+
+  Player.prototype.moveDown = function() {
+    this.y += 1;
+    this.direction = Direction.DOWN;
+  };
+
+  Player.prototype.moveUp = function() {
+    this.y -= 1;
+    this.direction = Direction.UP;
+  };
+
+  Player.prototype.moveLeft = function() {
+    this.x -= 1;
+    this.direction = Direction.LEFT;
+  };
+
+  Player.prototype.moveRight = function() {
+    this.x += 1;
+    this.direction = Direction.RIGHT;
+  };
+
+  Player.prototype.draw = function(context) {
+    var offsetX = Math.floor(this.animationStep / 15) * 32, offsetY = 0;
+
+    switch(this.direction) {
+      case Direction.UP:
+        offsetY = 48 * 3;
+        break;
+      case Direction.RIGHT:
+        offsetY = 48 * 2;
+        break;
+      case Direction.LEFT:
+        offsetY = 48;
+        break;
+    }
 
-})(window);
+    context.drawImage(this.image.data, offsetX, offsetY, 32, 48, this.pixelX, this.pixelY - 16, 32, 48);
+  };
+});
diff --git a/tests/resources/userdiff/expected/driver/diff.javascript b/tests/resources/userdiff/expected/driver/diff.javascript
index 4e65d07..4cefe5c 100644
--- a/tests/resources/userdiff/expected/driver/diff.javascript
+++ b/tests/resources/userdiff/expected/driver/diff.javascript
@@ -1,40 +1,27 @@
 diff --git a/files/file.javascript b/files/file.javascript
-index b9f1286..7cd3c5a 100644
+index 0965b37..5391797 100644
 --- a/files/file.javascript
 +++ b/files/file.javascript
-@@ -16,3 +16,4 @@ function getViewportH ()
-     var client = docElem['clientHeight'],
--      inner = window['innerHeight'];
-+      inner = window['innerHeight'],
-+      sample = window['otherProperty'];
+@@ -4,4 +4,3 @@ function(require, exports, module)
+   var Key = require("./key")
+-    , Direction = require("./direction")
+-    , Image = require("./image");
++    , Direction = require("./direction");
  
-@@ -27,3 +28,3 @@ function getOffset (el)
-       if (!isNaN(el.offsetTop)) {
--        offsetTop += el.offsetTop;
-+        offsetTop += el.offsetTop + 1;
-       }
-@@ -43,8 +44,7 @@ function isElementInViewport (el, h)
-         viewed = scrolled + getViewportH(),
--        elH = el.offsetHeight,
-         elTop = getOffset(el).top,
--        elBottom = elTop + elH,
-+        elBottom = elTop + el.offsetHeight,
-         h = h || 0;
+@@ -16,4 +15,4 @@ function Player(game)
  
--    return (elTop + elH * h) <= viewed && (elBottom) >= scrolled;
-+    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
-   }
-@@ -60,4 +60,2 @@ _init: function ()
+-    this.pixelX = 0;
+-    this.pixelY = 0;
++    this.pixelX = 10;
++    this.pixelY = 10;
  
--  //  Initialize all scrollreveals, triggering all
--  //  reveals on visible elements.
-       this.elems.forEach(function (el, i) {
-@@ -71,3 +69,3 @@ var scrollHandler = function ()
-             self._scrollPage();
--          }, 60);
-+          }, 61);
-         }
-@@ -101,2 +99,3 @@ _scrollPage: function ()
-         this.scrolled = false;
-+		this.tested = true;
-     },
+@@ -82,3 +81,3 @@ Player.prototype.moveUp = function()
+   Player.prototype.moveLeft = function() {
+-    this.x -= 1;
++    this.x -= 5;
+     this.direction = Direction.LEFT;
+@@ -106,3 +105,3 @@ Player.prototype.draw = function(context)
+ 
+-    context.drawImage(this.image.data, offsetX, offsetY, 32, 48, this.pixelX, this.pixelY - 16, 32, 48);
++    context.drawImage(this.image.data, offsetX, offsetY, 32, 48, this.pixelX, this.pixelY, 32, 48);
+   };
diff --git a/tests/resources/userdiff/expected/nodriver/diff.javascript b/tests/resources/userdiff/expected/nodriver/diff.javascript
index 69afe4f..4bbd547 100644
--- a/tests/resources/userdiff/expected/nodriver/diff.javascript
+++ b/tests/resources/userdiff/expected/nodriver/diff.javascript
@@ -1,40 +1,27 @@
 diff --git a/files/file.javascript b/files/file.javascript
-index b9f1286..7cd3c5a 100644
+index 0965b37..5391797 100644
 --- a/files/file.javascript
 +++ b/files/file.javascript
-@@ -16,3 +16,4 @@
-     var client = docElem['clientHeight'],
--      inner = window['innerHeight'];
-+      inner = window['innerHeight'],
-+      sample = window['otherProperty'];
+@@ -4,4 +4,3 @@ define(function(require, exports, module) {
+   var Key = require("./key")
+-    , Direction = require("./direction")
+-    , Image = require("./image");
++    , Direction = require("./direction");
  
-@@ -27,3 +28,3 @@
-       if (!isNaN(el.offsetTop)) {
--        offsetTop += el.offsetTop;
-+        offsetTop += el.offsetTop + 1;
-       }
-@@ -43,8 +44,7 @@
-         viewed = scrolled + getViewportH(),
--        elH = el.offsetHeight,
-         elTop = getOffset(el).top,
--        elBottom = elTop + elH,
-+        elBottom = elTop + el.offsetHeight,
-         h = h || 0;
+@@ -16,4 +15,4 @@ define(function(require, exports, module) {
  
--    return (elTop + elH * h) <= viewed && (elBottom) >= scrolled;
-+    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
-   }
-@@ -60,4 +60,2 @@
+-    this.pixelX = 0;
+-    this.pixelY = 0;
++    this.pixelX = 10;
++    this.pixelY = 10;
  
--  //  Initialize all scrollreveals, triggering all
--  //  reveals on visible elements.
-       this.elems.forEach(function (el, i) {
-@@ -71,3 +69,3 @@
-             self._scrollPage();
--          }, 60);
-+          }, 61);
-         }
-@@ -101,2 +99,3 @@
-         this.scrolled = false;
-+		this.tested = true;
-     },
+@@ -82,3 +81,3 @@ define(function(require, exports, module) {
+   Player.prototype.moveLeft = function() {
+-    this.x -= 1;
++    this.x -= 5;
+     this.direction = Direction.LEFT;
+@@ -106,3 +105,3 @@ define(function(require, exports, module) {
+ 
+-    context.drawImage(this.image.data, offsetX, offsetY, 32, 48, this.pixelX, this.pixelY - 16, 32, 48);
++    context.drawImage(this.image.data, offsetX, offsetY, 32, 48, this.pixelX, this.pixelY, 32, 48);
+   };
diff --git a/tests/resources/userdiff/files/file.javascript b/tests/resources/userdiff/files/file.javascript
index 7cd3c5a..5391797 100644
--- a/tests/resources/userdiff/files/file.javascript
+++ b/tests/resources/userdiff/files/file.javascript
@@ -1,108 +1,108 @@
-/*
-  Some code extracted from https://github.com/julianlloyd/scrollReveal.js
-  which happens to be a trending Javascript repo with an MIT license at
-  the time I was working on Javascript userdiff support in libgit2
+define(function(require, exports, module) {
+  module.exports = Player;
 
-  I extracted just some of the code, so I suspect this is no longer valid
-  Javascript code, but it contains enough example patterns to work.
-*/
-;(function (window) {
+  var Key = require("./key")
+    , Direction = require("./direction");
 
-  'use strict';
+  function Player(game) {
+    this.game = game;
 
-  var docElem = window.document.documentElement;
+    this.image = new Image("./assets/fighter.png");
+    this.game.resources.add(this.image);
 
-  function getViewportH () {
-    var client = docElem['clientHeight'],
-      inner = window['innerHeight'],
-      sample = window['otherProperty'];
+    this.x = 0;
+    this.y = 0;
 
-    return (client < inner) ? inner : client;
-  }
-
-  function getOffset (el) {
-    var offsetTop = 0,
-        offsetLeft = 0;
+    this.pixelX = 10;
+    this.pixelY = 10;
 
-    do {
-      if (!isNaN(el.offsetTop)) {
-        offsetTop += el.offsetTop + 1;
-      }
-      if (!isNaN(el.offsetLeft)) {
-        offsetLeft += el.offsetLeft;
-      }
-    } while (el = el.offsetParent)
-
-    return {
-      top: offsetTop,
-      left: offsetLeft
-    }
+    this.animationStep = 0;
   }
 
-  function isElementInViewport (el, h) {
-    var scrolled = window.pageYOffset,
-        viewed = scrolled + getViewportH(),
-        elTop = getOffset(el).top,
-        elBottom = elTop + el.offsetHeight,
-        h = h || 0;
-
-    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
-  }
-
-  scrollReveal.prototype = {
-
-    _init: function () {
-
-      var self = this;
-
-      this.elems = Array.prototype.slice.call(docElem.querySelectorAll('[data-scrollReveal]'));
-      this.scrolled = false;
+  Player.prototype.update = function() {
+    if (!this.isWalking()) {
+      this.handleInput();
+    }
 
-      this.elems.forEach(function (el, i) {
-        self.animate(el);
-      });
+    if (this.isWalking()) {
+      // Increase the animation step.
+      this.animationStep = ++this.animationStep % 60;
 
-      var scrollHandler = function () {
-        if (!self.scrolled) {
-          self.scrolled = true;
-          setTimeout(function () {
-            self._scrollPage();
-          }, 61);
-        }
-      };
+      if (this.x * 32 > this.pixelX) {
+        this.pixelX++;
+      } else if (this.x * 32 < this.pixelX) {
+        this.pixelX--;
+      }
 
-      var resizeHandler = function () {
-        function delayed() {
-          self._scrollPage();
-          self.resizeTimeout = null;
-        }
-        if (self.resizeTimeout) {
-          clearTimeout(self.resizeTimeout);
+      if (this.y * 32 > this.pixelY) {
+        this.pixelY++;
+      } else if (this.y * 32 < this.pixelY) {
+        this.pixelY--;
+      }
+    } else {
+      // Reset the animation step.
+      this.animationStep = 0;
+    }
+  };
+
+  Player.prototype.handleInput = function() {
+    var keyboard = this.game.keyboard, finalAction, action, inputs = {
+      'moveDown': keyboard.isDown(Key.DOWN),
+      'moveUp': keyboard.isDown(Key.UP),
+      'moveLeft': keyboard.isDown(Key.LEFT),
+      'moveRight': keyboard.isDown(Key.RIGHT)
+    };
+
+    for (action in inputs) {
+      if (inputs[action]) {
+        if (!finalAction || inputs[finalAction] < inputs[action]) {
+          finalAction = action;
         }
-        self.resizeTimeout = setTimeout(delayed, 200);
-      };
-
-      window.addEventListener('scroll', scrollHandler, false);
-      window.addEventListener('resize', resizeHandler, false);
-    },
-
-    /*=============================================================================*/
-
-    _scrollPage: function () {
-        var self = this;
-
-        this.elems.forEach(function (el, i) {
-            if (isElementInViewport(el, self.options.viewportFactor)) {
-                self.animate(el);
-            }
-        });
-        this.scrolled = false;
-		this.tested = true;
-    },
-  }; // end scrollReveal.prototype
+      }
+    }
 
-  document.addEventListener("DOMContentLoaded", function (evt) {
-    window.scrollReveal = new scrollReveal();
-  });
+    this[finalAction] && this[finalAction]();
+  };
+
+  Player.prototype.isWalking = function() {
+    return this.x * 32 != this.pixelX || this.y * 32 != this.pixelY;
+  };
+
+  Player.prototype.moveDown = function() {
+    this.y += 1;
+    this.direction = Direction.DOWN;
+  };
+
+  Player.prototype.moveUp = function() {
+    this.y -= 1;
+    this.direction = Direction.UP;
+  };
+
+  Player.prototype.moveLeft = function() {
+    this.x -= 5;
+    this.direction = Direction.LEFT;
+  };
+
+  Player.prototype.moveRight = function() {
+    this.x += 1;
+    this.direction = Direction.RIGHT;
+  };
+
+  Player.prototype.draw = function(context) {
+    var offsetX = Math.floor(this.animationStep / 15) * 32, offsetY = 0;
+
+    switch(this.direction) {
+      case Direction.UP:
+        offsetY = 48 * 3;
+        break;
+      case Direction.RIGHT:
+        offsetY = 48 * 2;
+        break;
+      case Direction.LEFT:
+        offsetY = 48;
+        break;
+    }
 
-})(window);
+    context.drawImage(this.image.data, offsetX, offsetY, 32, 48, this.pixelX, this.pixelY, 32, 48);
+  };
+});