1// Copyright 2014 Google Inc. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5//     You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12//     See the License for the specific language governing permissions and
13// limitations under the License.
14
15(function(shared, testing) {
16  var shorthandToLonghand = {
17    background: [
18      'backgroundImage',
19      'backgroundPosition',
20      'backgroundSize',
21      'backgroundRepeat',
22      'backgroundAttachment',
23      'backgroundOrigin',
24      'backgroundClip',
25      'backgroundColor'
26    ],
27    border: [
28      'borderTopColor',
29      'borderTopStyle',
30      'borderTopWidth',
31      'borderRightColor',
32      'borderRightStyle',
33      'borderRightWidth',
34      'borderBottomColor',
35      'borderBottomStyle',
36      'borderBottomWidth',
37      'borderLeftColor',
38      'borderLeftStyle',
39      'borderLeftWidth'
40    ],
41    borderBottom: [
42      'borderBottomWidth',
43      'borderBottomStyle',
44      'borderBottomColor'
45    ],
46    borderColor: [
47      'borderTopColor',
48      'borderRightColor',
49      'borderBottomColor',
50      'borderLeftColor'
51    ],
52    borderLeft: [
53      'borderLeftWidth',
54      'borderLeftStyle',
55      'borderLeftColor'
56    ],
57    borderRadius: [
58      'borderTopLeftRadius',
59      'borderTopRightRadius',
60      'borderBottomRightRadius',
61      'borderBottomLeftRadius'
62    ],
63    borderRight: [
64      'borderRightWidth',
65      'borderRightStyle',
66      'borderRightColor'
67    ],
68    borderTop: [
69      'borderTopWidth',
70      'borderTopStyle',
71      'borderTopColor'
72    ],
73    borderWidth: [
74      'borderTopWidth',
75      'borderRightWidth',
76      'borderBottomWidth',
77      'borderLeftWidth'
78    ],
79    flex: [
80      'flexGrow',
81      'flexShrink',
82      'flexBasis'
83    ],
84    font: [
85      'fontFamily',
86      'fontSize',
87      'fontStyle',
88      'fontVariant',
89      'fontWeight',
90      'lineHeight'
91    ],
92    margin: [
93      'marginTop',
94      'marginRight',
95      'marginBottom',
96      'marginLeft'
97    ],
98    outline: [
99      'outlineColor',
100      'outlineStyle',
101      'outlineWidth'
102    ],
103    padding: [
104      'paddingTop',
105      'paddingRight',
106      'paddingBottom',
107      'paddingLeft'
108    ]
109  };
110
111  var shorthandExpanderElem = document.createElementNS('http://www.w3.org/1999/xhtml', 'div');
112
113  var borderWidthAliases = {
114    thin: '1px',
115    medium: '3px',
116    thick: '5px'
117  };
118
119  var aliases = {
120    borderBottomWidth: borderWidthAliases,
121    borderLeftWidth: borderWidthAliases,
122    borderRightWidth: borderWidthAliases,
123    borderTopWidth: borderWidthAliases,
124    fontSize: {
125      'xx-small': '60%',
126      'x-small': '75%',
127      'small': '89%',
128      'medium': '100%',
129      'large': '120%',
130      'x-large': '150%',
131      'xx-large': '200%'
132    },
133    fontWeight: {
134      normal: '400',
135      bold: '700'
136    },
137    outlineWidth: borderWidthAliases,
138    textShadow: {
139      none: '0px 0px 0px transparent'
140    },
141    boxShadow: {
142      none: '0px 0px 0px 0px transparent'
143    }
144  };
145
146  function antiAlias(property, value) {
147    if (property in aliases) {
148      return aliases[property][value] || value;
149    }
150    return value;
151  }
152
153  // This delegates parsing shorthand value syntax to the browser.
154  function expandShorthandAndAntiAlias(property, value, result) {
155    var longProperties = shorthandToLonghand[property];
156    if (longProperties) {
157      shorthandExpanderElem.style[property] = value;
158      for (var i in longProperties) {
159        var longProperty = longProperties[i];
160        var longhandValue = shorthandExpanderElem.style[longProperty];
161        result[longProperty] = antiAlias(longProperty, longhandValue);
162      }
163    } else {
164      result[property] = antiAlias(property, value);
165    }
166  };
167
168  function normalizeKeyframes(effectInput) {
169    if (!Array.isArray(effectInput) && effectInput !== null)
170      throw new TypeError('Keyframe effect must be null or an array of keyframes');
171
172    if (effectInput == null)
173      return [];
174
175    var keyframeEffect = effectInput.map(function(originalKeyframe) {
176      var keyframe = {};
177      for (var member in originalKeyframe) {
178        var memberValue = originalKeyframe[member];
179        if (member == 'offset') {
180          if (memberValue != null) {
181            memberValue = Number(memberValue);
182            if (!isFinite(memberValue))
183              throw new TypeError('keyframe offsets must be numbers.');
184          }
185        } else if (member == 'composite') {
186          throw {
187            type: DOMException.NOT_SUPPORTED_ERR,
188            name: 'NotSupportedError',
189            message: 'add compositing is not supported'
190          };
191        } else if (member == 'easing') {
192          memberValue = shared.toTimingFunction(memberValue);
193        } else {
194          memberValue = '' + memberValue;
195        }
196        expandShorthandAndAntiAlias(member, memberValue, keyframe);
197      }
198      if (keyframe.offset == undefined)
199        keyframe.offset = null;
200      if (keyframe.easing == undefined)
201        keyframe.easing = shared.toTimingFunction('linear');
202      return keyframe;
203    });
204
205    var everyFrameHasOffset = true;
206    var looselySortedByOffset = true;
207    var previousOffset = -Infinity;
208    for (var i = 0; i < keyframeEffect.length; i++) {
209      var offset = keyframeEffect[i].offset;
210      if (offset != null) {
211        if (offset < previousOffset) {
212          throw {
213            code: DOMException.INVALID_MODIFICATION_ERR,
214            name: 'InvalidModificationError',
215            message: 'Keyframes are not loosely sorted by offset. Sort or specify offsets.'
216          };
217        }
218        previousOffset = offset;
219      } else {
220        everyFrameHasOffset = false;
221      }
222    }
223
224    keyframeEffect = keyframeEffect.filter(function(keyframe) {
225      return keyframe.offset >= 0 && keyframe.offset <= 1;
226    });
227
228    function spaceKeyframes() {
229      var length = keyframeEffect.length;
230      if (keyframeEffect[length - 1].offset == null)
231        keyframeEffect[length - 1].offset = 1;
232      if (length > 1 && keyframeEffect[0].offset == null)
233        keyframeEffect[0].offset = 0;
234
235      var previousIndex = 0;
236      var previousOffset = keyframeEffect[0].offset;
237      for (var i = 1; i < length; i++) {
238        var offset = keyframeEffect[i].offset;
239        if (offset != null) {
240          for (var j = 1; j < i - previousIndex; j++)
241            keyframeEffect[previousIndex + j].offset = previousOffset + (offset - previousOffset) * j / (i - previousIndex);
242          previousIndex = i;
243          previousOffset = offset;
244        }
245      }
246    }
247    if (!everyFrameHasOffset)
248      spaceKeyframes();
249
250    return keyframeEffect;
251  }
252
253  shared.normalizeKeyframes = normalizeKeyframes;
254
255  if (WEB_ANIMATIONS_TESTING) {
256    testing.normalizeKeyframes = normalizeKeyframes;
257  }
258
259})(webAnimationsShared, webAnimationsTesting);
260