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cq-prolyfill.js
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cq-prolyfill.js
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/*
* Copyright Martin Auswöger
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
(function(
window,
document,
/*eslint-disable no-shadow-restricted-names*/
undefined
/*eslint-enable no-shadow-restricted-names*/
) {
'use strict';
(function (factory) {
/*global define*/
/* istanbul ignore next: don’t cover module definition */
if (typeof define === 'function' && define.amd) {
define([], function() {
return factory;
});
}
/*global module*/
else if (typeof module === 'object' && module.exports) {
module.exports = factory;
}
else {
/*eslint-disable dot-notation*/
window['cqApi'] = factory(window['cqConfig']);
/*eslint-enable dot-notation*/
}
}(function(config) {
config = config || {};
// Public API
/*eslint-disable dot-notation*/
var api = {
'reprocess': reprocess,
'reparse': reparse,
'reevaluate': reevaluate,
'config': config,
};
/*eslint-enable dot-notation*/
var REGEXP_ESCAPE_REGEXP = /[.?*+^$[\]\\(){}|-]/g;
var SELECTOR_REGEXP = /\.?:container\((?:[^()]+|\([^()]*\))+\)/gi;
var SELECTOR_ESCAPED_REGEXP = /\.\\:container\\\(((?:[^()]+?|\\\([^()]*\\\))+?)\\\)|\[data-cq~=["']((?:\\.|[^"'])+)["']\]/gi;
var QUERY_REGEXP = /^(?:(.+?)([<>]=?|=))??(?:(min|max)-)?([a-z-]+?)(?:-(hue|saturation|lightness|alpha))?(?:([<>]=?|=|:)(.+))?$/;
var ESCAPE_REGEXP = /[.:()<>=%,]/g;
var SPACE_REGEXP = / /g;
var LENGTH_REGEXP = /^(-?(?:\d*\.)?\d+)(em|ex|ch|rem|vh|vw|vmin|vmax|px|mm|cm|in|pt|pc)$/i;
var NUMBER_REGEXP = /^-?(?:\d*\.)?\d+$/i;
var COLOR_REGEXP = /^rgba?\s*\([0-9.,\s]*\)$/i;
var URL_VALUE_REGEXP = /url\(\s*(?:(["'])(.*?)\1|([^)\s]*))\s*\)/gi;
var ATTR_REGEXP = /\[.+?\]/g;
var PSEUDO_NOT_REGEXP = /:not\(/g;
var ID_REGEXP = /#[^\s\[\\#+,.:>~]+/g;
var CLASS_REGEXP = /\.[^\s\[\\#+,.:>~]+/g;
var PSEUDO_ELEMENT_REGEXP = /::[^\s\[\\#+,.:>~]+/g;
var PSEUDO_CLASS_REGEXP = /:[^\s\[\\#+,.:>~]+/g;
var ELEMENT_REGEXP = /[a-z-]+/gi;
var FIXED_UNIT_MAP = {
'px': 1,
'pt': 16 / 12,
'pc': 16,
'in': 96,
'cm': 96 / 2.54,
'mm': 96 / 25.4,
};
var queries;
var containerCache;
var styleCache;
var processedSheets = createCacheMap();
var requestCache = {};
var domMutations = [];
var processed = false;
var parsed = false;
var documentElement = document.documentElement;
var styleSheets = document.styleSheets;
var createElement = document.createElement.bind(document);
var requestAnimationFrame = window.requestAnimationFrame || setTimeout;
var observer;
var scheduledCall;
/**
* @param {function()} callback
*/
function reprocess(callback) {
preprocess(function() {
processed = true;
reparse(callback);
});
}
/**
* @param {function()} callback
*/
function reparse(callback) {
if (!processed) {
return reprocess(callback);
}
parseRules();
buildStyleCache();
parsed = true;
reevaluate(true, callback);
}
/**
* @param {boolean} clearContainerCache
* @param {function()} callback
* @param {Array.<Element>} contexts
*/
function reevaluate(clearContainerCache, callback, contexts) {
if (!parsed) {
return reparse(callback);
}
updateClasses(clearContainerCache, contexts);
if (callback) {
callback();
}
}
/**
* Schedule the execution of step 1, 2 or 3 for the next animation frame
*
* @param {number} step 1: reprocess, 2: reparse, 3: reevaluate
* @param {boolean} clearContainerCache
* @param {Array.<Element>} contexts
*/
function scheduleExecution(step, clearContainerCache, contexts) {
if (!scheduledCall) {
scheduledCall = {
_step: step,
_clearContainerCache: clearContainerCache,
_contexts: contexts,
};
requestAnimationFrame(executeScheduledCall);
return;
}
scheduledCall._step = Math.min(scheduledCall._step, step);
// Merge parameters for reevaluate
if (scheduledCall._step === 3) {
scheduledCall._clearContainerCache = scheduledCall._clearContainerCache || clearContainerCache;
if (scheduledCall._contexts && contexts) {
scheduledCall._contexts = scheduledCall._contexts.concat(contexts);
}
}
}
/**
* Executes the scheduled call from scheduleExecution() in an animation frame
*/
function executeScheduledCall() {
var call = scheduledCall;
scheduledCall = undefined;
if (call._step === 1) {
reprocess();
}
else if (call._step === 2) {
reparse();
}
else {
reevaluate(call._clearContainerCache, undefined, call._contexts);
}
}
/**
* Starts observing DOM events and mutations
*/
function startObserving() {
if (config.skipObserving) {
return;
}
// Reprocess now
scheduleExecution(1);
window.addEventListener('DOMContentLoaded', scheduleExecution.bind(undefined, 1, undefined, undefined));
window.addEventListener('load', scheduleExecution.bind(undefined, 1, undefined, undefined));
window.addEventListener('resize', scheduleExecution.bind(undefined, 3, true, undefined));
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
if (MutationObserver) {
observer = new MutationObserver(checkMutations);
observer.observe(document.documentElement, {
childList: true,
subtree: true,
});
}
else {
window.addEventListener('DOMNodeInserted', onDomMutate);
window.addEventListener('DOMNodeRemoved', onDomMutate);
}
}
/**
* Check DOM mutations and reprocess or reevaluate
*
* @param {Array.<MutationRecord>} mutations
*/
function checkMutations(mutations) {
// Skip iterating the nodes, if a run is already scheduled, to improve performance
if (scheduledCall && (scheduledCall._level < 3 || !scheduledCall._contexts)) {
return;
}
var addedNodes = [];
var stylesChanged = false;
var replacedSheets = [];
processedSheets.forEach(function(newNode) {
replacedSheets.push(newNode);
});
arrayFrom(mutations).forEach(function(mutation) {
addedNodes.push.apply(addedNodes, arrayFrom(mutation.addedNodes).filter(function(node) {
return node.nodeType === 1;
}));
arrayFrom(mutation.removedNodes).forEach(function(node) {
var index = addedNodes.indexOf(node);
if (index !== -1) {
addedNodes.splice(index, 1);
}
else if (
(node.tagName === 'LINK' || node.tagName === 'STYLE')
&& replacedSheets.indexOf(node) === -1
) {
stylesChanged = true;
}
});
});
addedNodes.forEach(function(node) {
if (node.sheet && replacedSheets.indexOf(node) === -1) {
stylesChanged = true;
}
});
if (stylesChanged) {
scheduleExecution(1);
}
else if (addedNodes.length) {
scheduleExecution(3, false, addedNodes);
}
}
/**
* Event handler for DOMNodeInserted and DOMNodeRemoved
*
* @param {MutationEvent} event
*/
function onDomMutate(event) {
var mutation = {
addedNodes: [],
removedNodes: [],
};
mutation[
(event.type === 'DOMNodeInserted' ? 'added' : 'removed') + 'Nodes'
] = [event.target];
domMutations.push(mutation);
// Delay the call to checkMutations()
setTimeout(function() {
checkMutations(domMutations);
domMutations = [];
});
}
/**
* Step 1: Preprocess all active stylesheets in the document
*
* Look for stylesheets that contain container queries and escape them to be
* readable by the browser, e.g. convert `:container(width >= 10px)` to
* `\:container\(width\>\=10px\)`
*
* @param {function()} callback
*/
function preprocess(callback) {
var sheets = arrayFrom(styleSheets);
// Check removed stylesheets
processedSheets.forEach(function(newNode, node) {
// Original stylesheet has been deleted
if (sheets.indexOf(node.sheet) === -1) {
if (newNode && sheets.indexOf(newNode.sheet) !== -1 && newNode.parentNode) {
sheets.splice(sheets.indexOf(newNode.sheet), 1);
newNode.parentNode.removeChild(newNode);
}
processedSheets.delete(node);
}
});
var done = -1;
function step() {
done++;
if (done === sheets.length) {
callback();
}
}
sheets.forEach(function(sheet) {
preprocessSheet(sheet, step);
});
step();
}
/**
* @param {CSSStyleSheet} sheet
* @param {function()} callback
*/
function preprocessSheet(sheet, callback) {
if (sheet.disabled) {
callback();
return;
}
if (!config.preprocess) {
var rulesLength = -1;
try {
rulesLength = sheet.cssRules.length;
}
catch(e) {
// Do nothing
}
// Check if cssRules is accessible
if (rulesLength !== -1 || !sheet.ownerNode.getAttribute('crossorigin')) {
callback();
return;
}
}
var ownerNode = sheet.ownerNode;
var tag = ownerNode && ownerNode.tagName;
if (tag === 'LINK' && !processedSheets.has(ownerNode)) {
loadExternal(ownerNode.href, function(cssText) {
// Check again because loadExternal is async
if (sheet.disabled || !cssText) {
callback();
return;
}
preprocessStyle(ownerNode, fixRelativeUrls(cssText, ownerNode.href));
callback();
});
}
else if (tag === 'STYLE') {
preprocessStyle(ownerNode, ownerNode.innerHTML);
callback();
}
else {
callback();
}
}
/**
* Load external file via AJAX
*
* @param {string} href
* @param {function(string)} callback Gets called with the response text on
* success or empty string on failure
*/
function loadExternal(href, callback) {
var cacheEntryType = typeof requestCache[href];
if (cacheEntryType === 'string') {
callback(requestCache[href]);
return;
}
else if (cacheEntryType === 'object') {
requestCache[href].push(callback);
return;
}
requestCache[href] = [callback]
var isDone = false;
var done = function(response) {
if (!isDone) {
response = response || '';
requestCache[href].forEach(function(cachedCallback) {
setTimeout(function() {
cachedCallback(response);
});
});
requestCache[href] = response;
}
isDone = true;
};
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
if (xhr.readyState !== 4) {
return;
}
done(xhr.status === 200 && xhr.responseText);
};
try {
xhr.open('GET', href);
xhr.send();
}
catch(e) {
if (window.XDomainRequest) {
xhr = new XDomainRequest();
xhr.onprogress =
/* istanbul ignore next: fix for a rare IE9 bug */
function() {};
xhr.onload = xhr.onerror = xhr.ontimeout = function() {
done(xhr.responseText);
};
try {
xhr.open('GET', href);
xhr.send();
}
catch(e2) {
done();
}
}
else {
done();
}
}
}
/**
* Replace relative CSS URLs with their absolute counterpart
*
* @param {string} cssText
* @param {string} href URL of the stylesheet
* @return {string}
*/
function fixRelativeUrls(cssText, href) {
var base = resolveRelativeUrl(href, document.baseURI);
return cssText.replace(URL_VALUE_REGEXP, function(match, quote, url1, url2) {
var url = url1 || url2;
if (!url) {
return match;
}
return 'url(' + (quote || '"') + resolveRelativeUrl(url, base) + (quote || '"') + ')';
});
}
/**
* @param {string} url
* @param {string} base
* @return {string}
*/
function resolveRelativeUrl(url, base) {
var absoluteUrl;
try {
absoluteUrl = new URL(url, base).href;
}
catch(e) {
absoluteUrl = false;
}
if (!absoluteUrl) {
var baseElement = createElement('base');
baseElement.href = base;
document.head.insertBefore(baseElement, document.head.firstChild);
var link = createElement('a');
link.href = url;
absoluteUrl = link.href;
// Catch error in iOS 7.0
try {
// Fix for a bug in Opera 12
delete baseElement.href;
}
catch(e) {
// Do nothing
}
document.head.removeChild(baseElement);
}
return absoluteUrl;
}
/**
* @param {Node} node Stylesheet ownerNode
* @param {string} cssText
*/
function preprocessStyle(node, cssText) {
processedSheets.set(node, false);
var escapedText = escapeSelectors(cssText);
var rulesLength = -1;
if (escapedText === cssText) {
try {
rulesLength = node.sheet.cssRules.length;
}
catch(e) {
rulesLength = -1;
}
// Check if cssRules is accessible
if (rulesLength !== -1) {
return;
}
}
var style = createElement('style');
style.textContent = escapedText;
style.media = node.media || 'all';
node.parentNode.insertBefore(style, node);
node.sheet.disabled = true;
processedSheets.set(node, style);
}
/**
* @param {string} cssText
* @return {string}
*/
function escapeSelectors(cssText) {
return cssText.replace(SELECTOR_REGEXP, function(selector) {
return '.' + selector.substr(selector[0] === '.' ? 1 : 0)
.replace(SPACE_REGEXP, '')
.replace(/"/g, '')
.replace(ESCAPE_REGEXP, '\\$&')
.toLowerCase();
});
}
/**
* Step 2: Parse all processed container query rules and store them in `queries`
* indexed by the preceding selector
*/
function parseRules() {
queries = {};
var rules;
for (var i = 0; i < styleSheets.length; i++) {
if (styleSheets[i].disabled) {
continue;
}
try {
rules = styleSheets[i].cssRules;
if (!rules || !rules.length) {
continue;
}
}
catch(e) {
continue;
}
for (var j = 0; j < rules.length; j++) {
parseRule(rules[j]);
}
}
}
/**
* @param {CSSRule} rule
*/
function parseRule(rule) {
if (rule.cssRules) {
for (var i = 0; i < rule.cssRules.length; i++) {
parseRule(rule.cssRules[i]);
}
return;
}
if (rule.type !== 1) {
return;
}
splitSelectors(rule.selectorText).forEach(function(selector) {
selector = escapeSelectors(selector);
selector.replace(SELECTOR_ESCAPED_REGEXP, function(match, query, queryUnescaped, offset) {
var precedingSelector =
(
selector.substr(0, offset)
+ selector.substr(offset + match.length).replace(/^((?:\([^)]*\)|[^\s>+~])*).*$/, '$1')
)
.replace(SELECTOR_ESCAPED_REGEXP, '')
.replace(PSEUDO_ELEMENT_REGEXP, '')
.replace(/:(?:active|hover|focus|checked|before|after)/gi, '');
if (!precedingSelector.substr(-1).trim()) {
precedingSelector += '*';
}
var query = parseQuery(queryUnescaped || unescape(query));
if (query) {
query._selector = precedingSelector;
query._className = queryUnescaped ? undefined : unescape(match.substr(1));
query._attribute = queryUnescaped;
queries[precedingSelector + match] = query;
}
});
});
}
/**
* @param {string} query
* @return {Array.<{_prop: string, _filter: string, _types: array, _values: array, _valueType: string}>}
*/
function parseQuery(query) {
if (!(query = QUERY_REGEXP.exec(query))) {
return;
}
var values = [query[7], query[1]].filter(Boolean);
var valueType =
(query[5] || values[0].match(NUMBER_REGEXP)) ? 'n' :
values[0].match(LENGTH_REGEXP) ? 'l' :
values[0].match(COLOR_REGEXP) ? 'c' :
's';
if (valueType === 'n') {
values = values.map(parseFloat);
}
else if (valueType === 'c') {
values = values.map(function(value) {
return parseColor(value).join(',');
});
}
return {
_prop: query[4],
_filter: query[5],
_types: [
query[6] !== ':' ? query[6]
: query[3] === 'min' ? '>='
: query[3] ? '<='
: '=',
query[2] && query[2].replace(/[<>]/, function(match) {
// Invert the left side comparison operator
return match === '<' ? '>' : '<';
}),
].filter(Boolean),
_values: values,
_valueType: valueType,
};
}
/**
* Unescape backslash escaped string
*
* @param {string} string
* @return {string}
*/
function unescape(string) {
return string && string.replace(/\\(.)/g, '$1');
}
/**
* Split multiple selectors by `,`
*
* @param {string} selectors
* @return {Array.<string>}
*/
function splitSelectors(selectors) {
return (selectors.match(/(?:\\.|"(?:\\.|[^"])*"|\([^)]*\)|[^,])+/g) || [])
.map(function(selector) {
return selector.trim();
});
}
/**
* Builds the styleCache needed by getOriginalStyle
*/
function buildStyleCache() {
styleCache = {
width: {},
height: {},
};
var rules;
for (var i = 0; i < styleSheets.length; i++) {
if (styleSheets[i].disabled) {
continue;
}
try {
rules = styleSheets[i].cssRules;
if (!rules || !rules.length) {
continue;
}
}
catch(e) {
continue;
}
buildStyleCacheFromRules(rules);
}
}
/**
* @param {CSSRuleList} rules
*/
function buildStyleCacheFromRules(rules) {
for (var i = 0; i < rules.length; i++) {
if (rules[i].type === 1) { // Style rule
if (
rules[i].style.getPropertyValue('width')
|| rules[i].style.getPropertyValue('height')
) {
splitSelectors(escapeSelectors(rules[i].selectorText)).forEach(function(selector) {
var rule = {
_selector: selector,
_rule: rules[i],
_specificity: getSpecificity(selector),
};
var rightMostSelector = selector
.replace(/:[a-z-]+\([^)]*\)/i, '')
.replace(/^.*[^\\][\s>+~]\s*/, '');
if (
rightMostSelector.match(PSEUDO_ELEMENT_REGEXP)
|| rightMostSelector.match(/:(?:before|after)/i)
) {
return;
}
rightMostSelector = rightMostSelector
.replace(PSEUDO_CLASS_REGEXP, '')
.trim();
['width', 'height'].forEach(function(prop) {
if (!rules[i].style.getPropertyValue(prop)) {
return;
}
var match = rightMostSelector.match(ID_REGEXP);
if (!match) {
match = rightMostSelector.match(CLASS_REGEXP);
}
if (!match) {
match = rightMostSelector.match(ELEMENT_REGEXP);
if (match) {
match = [match[0].toLowerCase()];
}
}
if (!match) {
match = '*';
}
if (!styleCache[prop][match[0]]) {
styleCache[prop][match[0]] = [];
}
styleCache[prop][match[0]].push(rule);
});
});
}
}
else if (rules[i].cssRules) {
buildStyleCacheFromRules(rules[i].cssRules);
}
}
}
/**
* Step 3: Loop through the `queries` and add or remove the CSS classes of all
* matching elements
*
* @param {boolean} clearContainerCache
* @param {Array.<Element>} contexts
*/
function updateClasses(clearContainerCache, contexts) {
if (clearContainerCache || !containerCache) {
containerCache = createCacheMap();
}
if (!Object.keys(queries).length) {
return;
}
var elementsTree = buildElementsTree(contexts);
while(updateClassesRead(elementsTree)) {
updateClassesWrite(elementsTree);
}
updateClassesWrite(elementsTree);
}
/**
* Update classes read step
*
* @param {Array.<{_element: Element, _children: array, _queries: array, _changes: array, _done: boolean}>} treeNodes
* @param {boolean} dontMarkAsDone
* @return {boolean} True if changes were found
*/
function updateClassesRead(treeNodes, dontMarkAsDone) {
var hasChanges = false;
var i, node, j, query;
for (i = 0; i < treeNodes.length; i++) {
node = treeNodes[i];
if (!node._done) {
for (j = 0; j < node._queries.length; j++) {
query = node._queries[j];
var queryMatches = evaluateQuery(node._element.parentNode, query);
if (queryMatches !== hasQuery(node._element, query)) {
node._changes.push([queryMatches, query]);
}
}
node._done = !dontMarkAsDone;
}
hasChanges = updateClassesRead(node._children, dontMarkAsDone || node._changes.length)
|| node._changes.length
|| hasChanges;
}
return hasChanges;
}
/**
* Update classes write step
*
* @param {Array.<{_element: Element, _children: array, _queries: array, _changes: array, _done: boolean}>} treeNodes
*/
function updateClassesWrite(treeNodes) {
var node, j;
for (var i = 0; i < treeNodes.length; i++) {
node = treeNodes[i];
for (j = 0; j < node._changes.length; j++) {
(node._changes[j][0] ? addQuery : removeQuery)(node._element, node._changes[j][1]);
}
node._changes = [];
updateClassesWrite(node._children);
}
}
/**
* Build tree of all query elements
*
* @param {Array.<Element>} contexts
* @return {Array.<{_element: Element, _children: array, _queries: array, _changes: array, _done: boolean}>}
*/
function buildElementsTree(contexts) {
contexts = contexts || [document];
var queriesArray = Object.keys(queries).map(function(key) {
return queries[key];
});
var selector = queriesArray.map(function(query) {
return query._selector;
}).join(',');
var elements = [];
contexts.forEach(function(context) {
for (var node = context.parentNode; node; node = node.parentNode) {
// Skip nested contexts
if (contexts.indexOf(node) !== -1) {
return;
}
}
if (context !== document && elementMatchesSelector(context, selector)) {
elements.push(context);
}
elements.push.apply(elements, arrayFrom(context.querySelectorAll(selector)));
});
var tree = [];
var treeCache = createCacheMap();
elements.forEach(function(element) {
if (element === documentElement) {
return;
}
var treeNode = {
_element: element,
_children: [],
_queries: [],
_changes: [],
_done: false,
};
var children = tree;
for (var node = element.parentNode; node; node = node.parentNode) {
if (treeCache.get(node)) {
children = treeCache.get(node)._children;
break;
}
}
treeCache.set(element, treeNode);
children.push(treeNode);
queriesArray.forEach(function(query) {
if (elementMatchesSelector(element, query._selector)) {
treeNode._queries.push(query);
}
});
});
return tree;
}
/**
* True if the query matches otherwise false
*
* @param {Element} parent
* @param {object} query
* @return {boolean}
*/
function evaluateQuery(parent, query) {
var container = getContainer(parent, query._prop);
var qValues = query._values.slice(0);
var i;
var cValue;
if (query._prop === 'width' || query._prop === 'height') {
cValue = getSize(container, query._prop);
}
else {
cValue = getComputedStyle(container).getPropertyValue(query._prop);
}
if (query._filter) {
var color = parseColor(cValue);
if (query._filter[0] === 'h') {
cValue = color[0];
}
else if (query._filter[0] === 's') {
cValue = color[1];
}
else if (query._filter[0] === 'l') {
cValue = color[2];
}
else if (query._filter[0] === 'a') {
cValue = color[3];
}
else {
return false;
}
}
else if (query._valueType === 'c') {
cValue = parseColor(cValue).join(',');
}
else if (query._valueType === 'l') {
for (i = 0; i < qValues.length; i++) {
qValues[i] = getComputedLength(qValues[i], parent);
}
if (typeof cValue === 'string') {
cValue = getComputedLength(cValue, parent);
}
}
else if (query._valueType === 'n') {
cValue = parseFloat(cValue);
}
else if (typeof cValue === 'string') {
cValue = cValue.trim();
}
if ((
query._types[0][0] === '>'
|| query._types[0][0] === '<'
) && (
typeof cValue !== 'number'
|| typeof qValues[0] !== 'number'
)) {
return false;
}
for (i = 0; i < qValues.length; i++) {
if (!(
(query._types[i] === '>=' && cValue >= qValues[i])
|| (query._types[i] === '<=' && cValue <= qValues[i])
|| (query._types[i] === '>' && cValue > qValues[i])
|| (query._types[i] === '<' && cValue < qValues[i])
|| (query._types[i] === '=' && cValue === qValues[i])
)) {
return false;
}
}
return true;
}
/**
* Get the nearest qualified container element starting by the element itself
*
* @param {Element} element
* @param {string} prop CSS property
* @return {Element}
*/
function getContainer(element, prop) {
var cache;
if (containerCache.has(element)) {
cache = containerCache.get(element);
if (cache[prop]) {
return cache[prop];
}
}
else {
cache = {};
containerCache.set(element, cache);
}
if (element === documentElement) {
cache[prop] = element;
}