WIP - add extractor, generate snippet_data

node_modules/raf/index.js

@@ -0,0 +1,75 @@
+var now = require('performance-now')
+  , root = typeof window === 'undefined' ? global : window
+  , vendors = ['moz', 'webkit']
+  , suffix = 'AnimationFrame'
+  , raf = root['request' + suffix]
+  , caf = root['cancel' + suffix] || root['cancelRequest' + suffix]
+
+for(var i = 0; !raf && i < vendors.length; i++) {
+  raf = root[vendors[i] + 'Request' + suffix]
+  caf = root[vendors[i] + 'Cancel' + suffix]
+      || root[vendors[i] + 'CancelRequest' + suffix]
+}
+
+// Some versions of FF have rAF but not cAF
+if(!raf || !caf) {
+  var last = 0
+    , id = 0
+    , queue = []
+    , frameDuration = 1000 / 60
+
+  raf = function(callback) {
+    if(queue.length === 0) {
+      var _now = now()
+        , next = Math.max(0, frameDuration - (_now - last))
+      last = next + _now
+      setTimeout(function() {
+        var cp = queue.slice(0)
+        // Clear queue here to prevent
+        // callbacks from appending listeners
+        // to the current frame's queue
+        queue.length = 0
+        for(var i = 0; i < cp.length; i++) {
+          if(!cp[i].cancelled) {
+            try{
+              cp[i].callback(last)
+            } catch(e) {
+              setTimeout(function() { throw e }, 0)
+            }
+          }
+        }
+      }, Math.round(next))
+    }
+    queue.push({
+      handle: ++id,
+      callback: callback,
+      cancelled: false
+    })
+    return id
+  }
+
+  caf = function(handle) {
+    for(var i = 0; i < queue.length; i++) {
+      if(queue[i].handle === handle) {
+        queue[i].cancelled = true
+      }
+    }
+  }
+}
+
+module.exports = function(fn) {
+  // Wrap in a new function to prevent
+  // `cancel` potentially being assigned
+  // to the native rAF function
+  return raf.call(root, fn)
+}
+module.exports.cancel = function() {
+  caf.apply(root, arguments)
+}
+module.exports.polyfill = function(object) {
+  if (!object) {
+    object = root;
+  }
+  object.requestAnimationFrame = raf
+  object.cancelAnimationFrame = caf
+}