web animations update

scripts/resources/web-animations-js/src/position-handler.js

@@ -0,0 +1,117 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function(scope) {
+
+  function negateDimension(dimension) {
+    var result = {};
+    for (var k in dimension) {
+      result[k] = -dimension[k];
+    }
+    return result;
+  }
+
+  function consumeOffset(string) {
+    return scope.consumeToken(/^(left|center|right|top|bottom)\b/i, string) || scope.consumeLengthOrPercent(string);
+  }
+
+  var offsetMap = {
+    left: {'%': 0},
+    center: {'%': 50},
+    right: {'%': 100},
+    top: {'%': 0},
+    bottom: {'%': 100},
+  };
+
+  function parseOrigin(slots, string) {
+    var result = scope.consumeRepeated(consumeOffset, /^/, string);
+    if (!result || result[1] != '') return;
+    var tokens = result[0];
+    tokens[0] = tokens[0] || 'center';
+    tokens[1] = tokens[1] || 'center';
+    if (slots == 3) {
+      tokens[2] = tokens[2] || {px: 0};
+    }
+    if (tokens.length != slots) {
+      return;
+    }
+    // Reorder so that the horizontal axis comes first.
+    if (/top|bottom/.test(tokens[0]) || /left|right/.test(tokens[1])) {
+      var tmp = tokens[0];
+      tokens[0] = tokens[1];
+      tokens[1] = tmp;
+    }
+    // Invalid if not horizontal then vertical.
+    if (!/left|right|center|Object/.test(tokens[0]))
+      return;
+    if (!/top|bottom|center|Object/.test(tokens[1]))
+      return;
+    return tokens.map(function(position) {
+      return typeof position == 'object' ? position : offsetMap[position];
+    });
+  }
+
+  var mergeOffsetList = scope.mergeNestedRepeated.bind(null, scope.mergeDimensions, ' ');
+  scope.addPropertiesHandler(parseOrigin.bind(null, 3), mergeOffsetList, ['transform-origin']);
+  scope.addPropertiesHandler(parseOrigin.bind(null, 2), mergeOffsetList, ['perspective-origin']);
+
+  function consumePosition(string) {
+    var result = scope.consumeRepeated(consumeOffset, /^/, string);
+    if (!result) {
+      return;
+    }
+
+    var tokens = result[0];
+    var out = [{'%': 50}, {'%': 50}];
+    var pos = 0;
+    var bottomOrRight = false;
+
+    for (var i = 0; i < tokens.length; i++) {
+      var token = tokens[i];
+      if (typeof token == 'string') {
+        bottomOrRight = /bottom|right/.test(token);
+        pos = {left: 0, right: 0, center: pos, top: 1, bottom: 1}[token];
+        out[pos] = offsetMap[token];
+        if (token == 'center') {
+          // Center doesn't accept a length offset.
+          pos++;
+        }
+      } else {
+        if (bottomOrRight) {
+          // If bottom or right we need to subtract the length from 100%
+          token = negateDimension(token);
+          token['%'] = (token['%'] || 0) + 100;
+        }
+        out[pos] = token;
+        pos++;
+        bottomOrRight = false;
+      }
+    }
+    return [out, result[1]];
+  }
+
+  function parsePositionList(string) {
+    var result = scope.consumeRepeated(consumePosition, /^,/, string);
+    if (result && result[1] == '') {
+      return result[0];
+    }
+  }
+
+  scope.consumePosition = consumePosition;
+  scope.mergeOffsetList = mergeOffsetList;
+
+  var mergePositionList = scope.mergeNestedRepeated.bind(null, mergeOffsetList, ', ');
+  scope.addPropertiesHandler(parsePositionList, mergePositionList, ['background-position', 'object-position']);
+
+})(webAnimations1);