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index.js
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index.js
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// TODO: handle setting special shortcut transform properties with arrays (translate, scale)?
// TODO: bulk transform properties
var identify = require('util.identify')
, win = window
, doc = window.document
, el = doc.createElement('div')
// Hash of unit values
, numeric = {
'top': 'px',
'bottom': 'px',
'left': 'px',
'right': 'px',
'width': 'px',
'height': 'px',
'margin-top': 'px',
'margin-bottom': 'px',
'margin-left': 'px',
'margin-right': 'px',
'padding-top': 'px',
'padding-bottom': 'px',
'padding-left': 'px',
'padding-right': 'px',
'border-bottom-left-radius': 'px',
'border-bottom-right-radius': 'px',
'border-top-left-radius': 'px',
'border-top-right-radius': 'px',
'transition-duration': 'ms',
'opacity': '',
'font-size': 'px',
'translateX': 'px',
'translateY': 'px',
'translateZ': 'px',
'scaleX': '',
'scaleY': '',
'scaleZ': '',
'rotate': 'deg',
'rotateX': 'deg',
'rotateY': 'deg',
'rotateZ': 'deg',
'skewX': 'deg',
'skewY': 'deg'
}
, colour = {
'background-color': true,
'color': true,
'border-color': true
}
// Hash of shorthand properties
, shorthand = {
'border-radius': ['border-bottom-left-radius', 'border-bottom-right-radius', 'border-top-left-radius', 'border-top-right-radius'],
'border-color': ['border-bottom-color', 'border-left-color', 'border-top-color', 'border-right-color'],
'margin': ['margin-top', 'margin-right', 'margin-left', 'margin-bottom'],
'padding': ['padding-top', 'padding-right', 'padding-left', 'padding-bottom']
}
// Hash of transform properties
, transform = {
'transform': true,
'translate': true,
'translateX': true,
'translateY': true,
'translate3d': true,
'translateZ': true,
'rotate': true,
'rotate3d': true,
'rotateX': true,
'rotateY': true,
'rotateZ': true,
'scale': true,
'scaleX': true,
'scaleY': true,
'scale3d': true,
'scaleZ': true,
'skew': true,
'skewX': true,
'skewY': true,
'perspective': true,
'matrix': true,
'matrix3d': true
}
, platformStyles = {}
, platformPrefix = ''
, RE_UNITS = /(px|%|em|ms|s|deg)$/
, RE_IE_OPACITY = /opacity=(\d+)/i
, RE_RGB = /rgb\((\d+),\s?(\d+),\s?(\d+)\)/
, RE_MATRIX = /^matrix(?:3d)?\(([^\)]+)/
, VENDOR_PREFIXES = ['-webkit-', '-moz-', '-ms-', '-o-']
, MATRIX_IDENTITY = [[1, 0, 0, 1, 0, 0], [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]]
, MATRIX_PROPERTY_INDEX = {
translateX: [4,12],
translateY: [5,13],
translateZ: [null,14],
scaleX: [0,0],
scaleY: [3,5],
scaleZ: [null,10],
rotate: [0,0],
rotateX: [null,5],
rotateY: [null,0],
rotateZ: [null,0],
skewY: [1,1],
skewX: [2,2]
};
// Store all possible styles this platform supports
var s = current(doc.documentElement)
, add = function (prop) {
platformStyles[prop] = true;
// Grab the prefix style
if (!platformPrefix && prop.charAt(0) == '-') {
platformPrefix = /^-\w+-/.exec(prop)[0];
}
};
if (s.length) {
for (var i = 0, n = s.length; i < n; i++) {
add(s[i]);
}
} else {
for (var prop in s) {
add(prop);
}
}
// Store opacity property name (normalize IE opacity/filter)
var opacity = !platformStyles['opacity'] && platformStyles['filter'] ? 'filter' : 'opacity';
// API
exports.isSupported = isSupported;
exports.getPrefixed = getPrefixed;
exports.getShorthand = getShorthand;
exports.getAll = getAll;
exports.expandShorthand = expandShorthand;
exports.parseOpacity = parseOpacity;
exports.getOpacityValue = getOpacityValue;
exports.parseNumber = parseNumber;
exports.parseTransform = parseTransform;
exports.getStyle = getStyle;
exports.getNumericStyle = getNumericStyle;
exports.getDocumentStyle = getDocumentStyle;
exports.setStyle = setStyle;
exports.clearStyle = clearStyle;
exports.platformStyles = platformStyles;
exports.platformPrefix = platformPrefix;
// CSS3 feature tests (also forces cache inclusion)
exports.hasTransitions = isSupported('transition');
exports.hasTransforms = isSupported('transform');
exports.has3DTransforms = (function () {
if (exports.hasTransforms) {
var prop = camelCase(getPrefixed('transform'));
el.style[prop] = 'translateZ(10px)';
return el.style[prop] != '';
}
return false;
})();
/**
* Determine if 'property' is supported on this platform
* @returns {Boolean}
*/
function isSupported (property) {
var props = [property, platformPrefix + property]
, support = false
, prop;
for (var i = 0, n = props.length; i < n; i++) {
prop = props[i];
// Use cached
if (exports.platformStyles[prop]) return true;
if (typeof el.style[prop] === 'string'
|| typeof el.style[camelCase(prop)] === 'string') {
support = true;
exports.platformStyles[prop] = true;
break;
}
}
return support;
}
/**
* Retrieve the vendor prefixed version of the property
* @param {String} property
* @returns {String}
*/
function getPrefixed (property) {
if (typeof property === 'string') {
// Handle transform pseudo-properties
if (transform[property]) {
property = 'transform';
}
if (exports.platformStyles[property]) return property;
if (isSupported(property)) {
if (exports.platformStyles[platformPrefix + property]) {
property = platformPrefix + property;
}
}
}
return property;
}
/**
* Retrieve a proxy property to use for shorthand properties
* @param {String} property
* @returns {String}
*/
function getShorthand (property) {
if (shorthand[property] != null) {
return shorthand[property][0];
} else {
return property;
}
}
/**
* Retrieve all possible variations of the property
* @param {String} property
* @returns {Array}
*/
function getAll (property) {
var all = [];
// Handle transform pseudo-properties
if (transform[property]) {
property = 'transform';
}
all.push(property);
// Handle shorthands
if (shorthand[property]) {
all = all.concat(shorthand[property]);
}
// Automatically add vendor prefix
for (var i = 0, n = all.length; i < n; i++) {
all.push(platformPrefix + all[i]);
}
return all;
}
/**
* Expand shorthand properties
* @param {String} property
* @param {Object} value
* @returns {Object|String}
*/
function expandShorthand (property, value) {
if (shorthand[property] != null) {
var props = {};
for (var i = 0, n = shorthand[property].length; i < n; i++) {
props[shorthand[property][i]] = value;
}
return props;
} else {
return property;
}
}
/**
* Parse current opacity value
* @param {String} value
* @returns {Number}
*/
function parseOpacity (value) {
var match;
if (value === '') {
return null;
// IE case
} else if (opacity === 'filter') {
match = value.match(RE_IE_OPACITY);
if (match != null) {
return parseInt(match[1], 10) / 100;
}
} else {
return parseFloat(value);
}
}
/**
* Convert opacity to IE filter syntax
* @param {String} value
* @returns {String}
*/
function getOpacityValue (value) {
var val = parseFloat(value);
if (opacity === 'filter') {
val = "alpha(opacity=" + (val * 100) + ")";
}
return val;
}
/**
* Split a value into a number and unit
* @param {String} value
* @param {String} property
* @returns {Array}
*/
function parseNumber (value, property) {
var channels, num, unit, unitTest;
if (value == null || value == 'none') {
value = 0;
}
// Handle arrays of values (translate, scale)
if (identify.isArray(value)) {
return value.map(function (val) {
return parseNumber(val, property);
});
}
// Handle colours
if (colour[property]) {
// rgb()
if (value != null && value.charAt(0) !== '#') {
channels = RE_RGB.exec(value);
if (channels) {
return ["#" + ((1 << 24) | (channels[1] << 16) | (channels[2] << 8) | channels[3]).toString(16).slice(1), 'hex'];
} else {
return ['#ffffff', 'hex'];
}
} else {
return [value || '#ffffff', 'hex'];
}
// Handle numbers
} else {
num = parseFloat(value);
if (identify.isNaN(num)) {
return [value, ''];
} else {
unitTest = RE_UNITS.exec(value);
// Set unit or default
unit = (unitTest != null)
? unitTest[1]
: ((numeric[property] != null)
? numeric[property]
: 'px');
return [num, unit];
}
}
}
/**
* Retrieve a 'property' from a transform 2d or 3d 'matrix'
* @param {String|Array} matrix
* @param {String} property
* @returns {String|Number|Array}
*/
function parseTransform (matrix, property) {
var m = matrixStringToArray(matrix)
, is3D = (m && m.length > 6) ? 1 : 0;
if (m) {
switch (property) {
case 'matrix':
case 'matrix3d':
return m;
case 'translateX':
case 'translateY':
return ''
+ m[MATRIX_PROPERTY_INDEX[property][is3D]]
+ 'px';
case 'translateZ':
return ''
+ (is3D ? m[MATRIX_PROPERTY_INDEX[property][is3D]] : '0')
+ 'px';
case 'translate':
return [parseTransform(matrix, 'translateX'), parseTransform(matrix, 'translateY')];
case 'translate3d':
return [parseTransform(matrix, 'translateX'), parseTransform(matrix, 'translateY'), parseTransform(matrix, 'translateZ')];
case 'scaleX':
case 'scaleY':
return m[MATRIX_PROPERTY_INDEX[property][is3D]];
case 'scaleZ':
return is3D ? m[10] : 1;
case 'scale':
return [parseTransform(matrix, 'scaleX'), parseTransform(matrix, 'scaleY')];
case 'scale3d':
return [parseTransform(matrix, 'scaleX'), parseTransform(matrix, 'scaleY'), parseTransform(matrix, 'scaleZ')];
case 'rotate':
case 'rotateY':
case 'rotateZ':
return ''
+ (Math.acos(m[0]) * 180) / Math.PI
+ 'deg';
case 'rotateX':
return ''
+ (Math.acos(m[5]) * 180) / Math.PI
+ 'deg';
case 'skewX':
return ''
+ (Math.atan(m[2]) * 180) / Math.PI
+ 'deg';
case 'skewY':
return ''
+ (Math.atan(m[1]) * 180) / Math.PI
+ 'deg';
}
}
return matrix;
}
/**
* Convert a matrix property to a transform style string
* Handles existing transforms and special grouped properties
* @param {Element} element
* @param {String} property
* @param {String|Array} value
* @returns {String}
*/
function generateTransform (element, property, value) {
var matrix = current(element, getPrefixed(property))
, m, m1, is3D, idx, len;
if (matrix == 'none') matrix = '';
// Reset existing matrix, preserving translations
if (matrix) {
if (m = matrixStringToArray(matrix)) {
is3D = m.length > 6 ? 1 : 0;
len = is3D ? 3 : 2;
idx = is3D ? 12 : 4;
// Preserve translations
if (!(~property.indexOf('translate'))) {
m1 = MATRIX_IDENTITY[is3D].slice(0, idx)
.concat(m.slice(idx, idx + len));
if (is3D) m1.push(MATRIX_IDENTITY[is3D].slice(-1));
m = m1;
// Preserve translations and nullify changed
} else {
if (property == 'translate' || property == 'translate3d') {
m1 = m.slice(0, idx)
.concat(MATRIX_IDENTITY[is3D].slice(idx, idx + len));
if (is3D) m1.push(m.slice(-1));
m = m1;
} else if (property == 'translateX' || property == 'translateY' || property == 'translateZ') {
idx = MATRIX_PROPERTY_INDEX[property][is3D];
if (idx) m[idx] = MATRIX_IDENTITY[is3D][idx];
}
}
matrix = is3D ? 'matrix3d' : 'matrix'
+ '('
+ m.join(', ')
+ ') ';
}
}
if (numeric[property] != null) {
return ''
+ matrix
+ property
+ '('
+ value
+ ')';
// Grouped properties
} else {
switch (property) {
case 'transform':
case 'transform3d':
return value;
case 'matrix':
case 'matrix3d':
return ''
+ property
+ '('
+ value
+ ')';
case 'translate':
case 'translate3d':
if (identify.isArray(value)) {
// Add default unit
value = value.map(function(item) {
return !identify.isString(item) ? item + 'px': item;
})
.join(', ');
}
return ''
+ matrix
+ property
+ '('
+ value
+ ')';
case 'scale':
case 'scale3d':
if (identify.isArray(value)) {
value = value.join(', ');
}
return ''
+ matrix
+ property
+ '('
+ value
+ ')';
}
}
}
/**
* Retrieve the style for 'property'
* @param {Element} element
* @param {String} property
* @returns {Object}
*/
function getStyle (element, property) {
var prop, value;
// Special case for opacity
if (property === 'opacity') {
return parseOpacity(current(element, opacity));
}
// Retrieve longhand and prefixed version
prop = getPrefixed(getShorthand(property));
value = current(element, prop);
// Special case for transform
if (transform[property]) {
return parseTransform(value, property);
}
switch (value) {
case '':
return null;
case 'auto':
return 0;
default:
return value;
}
}
/**
* Retrieve the numeric value for 'property'
* @param {Element} element
* @param {String} property
* @returns {Number}
*/
function getNumericStyle (element, property) {
return parseNumber(getStyle(element, property), property);
}
/**
* Retrieve the 'property' for matching 'selector' rule in all document stylesheets
* @param {String} selector
* @param {String} property
* @returns {String}
*/
function getDocumentStyle (selector, property) {
var styleSheets = document.styleSheets
, sheet, rules, rule;
if (styleSheets) {
for (var i = 0, n = styleSheets.length; i < n; i++) {
sheet = styleSheets[i];
if (rules = sheet.rules || sheet.cssRules) {
for (var j = 0, m = rules.length; j < m; j++) {
rule = rules[j];
if (selector === rule.selectorText) {
return rule.style.getPropertyValue(property);
}
}
}
}
}
return '';
}
/**
* Set the style for 'property'
* @param {Element} element
* @param {String|Object} property
* @param {Object} value
*/
function setStyle (element, property, value) {
var prop, matrix;
// Expand shorthands
prop = expandShorthand(property, value);
// Handle property hash returned from expandShorthand
if (identify.isObject(prop)) {
for (var p in prop) {
setStyle(element, p, prop[p]);
}
return;
}
// Handle opacity
if (prop === 'opacity') {
prop = opacity;
value = getOpacityValue(value);
}
// Look up default numeric unit if none provided
if (value !== 'auto'
&& value !== 'inherit'
&& numeric[prop]
&& !RE_UNITS.test(value)) {
value += numeric[prop];
}
// Look up prefixed property
prop = getPrefixed(prop);
// Handle special transform properties
if (transform[property]) {
value = generateTransform(element, property, value);
}
element.style[camelCase(prop)] = value;
}
/**
* Remove the style for 'property'
* @param {Element} element
* @param {String} property
*/
function clearStyle (element, property) {
var style = element.getAttribute('style') || ''
, re;
if (style) {
property = getAll(property).join('[\\w-]*|') + '[\\w-]*';
re = new RegExp('(?:^|\\s)(?:' + property + '):\\s?[^;]+;', 'ig');
element.setAttribute('style', style.replace(re, ''));
}
}
/**
* Retrieve current computed style
* @param {Element} element
* @param {String} property
* @returns {String}
*/
function current (element, property) {
var value;
if (win.getComputedStyle) {
if (property) {
value = win.getComputedStyle(element).getPropertyValue(property);
// Try with camel casing
if (value == null) win.getComputedStyle(element).getPropertyValue(camelCase(property));
return value;
} else {
return win.getComputedStyle(element);
}
// IE
} else {
if (property) {
value = element.currentStyle[property];
// Try with camel casing
if (value == null) element.currentStyle[camelCase(property)];
return value;
} else {
return element.currentStyle;
}
}
}
/**
* CamelCase 'str, removing '-'
* @param {String} str
* @returns {String}
*/
function camelCase (str) {
// IE requires vendor prefixed values to start with lowercase
if (str.indexOf('-ms-') == 0) str = str.slice(1);
return str.replace(/-([a-z]|[0-9])/ig, function(all, letter) {
return (letter + '').toUpperCase();
});
}
/**
* Convert 'matrix' to Array
* @param {String|Array} matrix
* @returns {Array}
*/
function matrixStringToArray (matrix) {
if (identify.isArray(matrix)) {
return matrix;
} else if (re = matrix.match(RE_MATRIX)) {
// Convert string to array
return re[1].split(', ')
.map(function (item) {
return parseFloat(item);
});
}
}