155 lines
No EOL
5 KiB
JavaScript
155 lines
No EOL
5 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.pseudoElements = undefined;
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exports.default = ensureCompatibility;
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var _caniuseApi = require('caniuse-api');
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var _postcssSelectorParser = require('postcss-selector-parser');
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var _postcssSelectorParser2 = _interopRequireDefault(_postcssSelectorParser);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const simpleSelectorRe = /^#?[-._a-z0-9 ]+$/i;
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const cssSel2 = 'css-sel2';
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const cssSel3 = 'css-sel3';
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const cssGencontent = 'css-gencontent';
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const cssFirstLetter = 'css-first-letter';
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const cssFirstLine = 'css-first-line';
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const cssInOutOfRange = 'css-in-out-of-range';
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const pseudoElements = exports.pseudoElements = {
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':active': cssSel2,
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':after': cssGencontent,
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':before': cssGencontent,
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':checked': cssSel3,
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':default': 'css-default-pseudo',
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':dir': 'css-dir-pseudo',
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':disabled': cssSel3,
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':empty': cssSel3,
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':enabled': cssSel3,
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':first-child': cssSel2,
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':first-letter': cssFirstLetter,
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':first-line': cssFirstLine,
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':first-of-type': cssSel3,
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':focus': cssSel2,
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':focus-within': 'css-focus-within',
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':has': 'css-has',
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':hover': cssSel2,
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':in-range': cssInOutOfRange,
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':indeterminate': 'css-indeterminate-pseudo',
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':lang': cssSel2,
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':last-child': cssSel3,
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':last-of-type': cssSel3,
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':matches': 'css-matches-pseudo',
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':not': cssSel3,
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':nth-child': cssSel3,
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':nth-last-child': cssSel3,
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':nth-last-of-type': cssSel3,
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':nth-of-type': cssSel3,
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':only-child': cssSel3,
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':only-of-type': cssSel3,
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':optional': 'css-optional-pseudo',
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':out-of-range': cssInOutOfRange,
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':placeholder-shown': 'css-placeholder-shown',
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':root': cssSel3,
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':target': cssSel3,
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'::after': cssGencontent,
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'::backdrop': 'dialog',
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'::before': cssGencontent,
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'::first-letter': cssFirstLetter,
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'::first-line': cssFirstLine,
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'::marker': 'css-marker-pseudo',
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'::placeholder': 'css-placeholder',
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'::selection': 'css-selection'
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};
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function isCssMixin(selector) {
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return selector[selector.length - 1] === ':';
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}
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const isSupportedCache = {};
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// Move to util in future
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function isSupportedCached(feature, browsers) {
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const key = JSON.stringify({ feature, browsers });
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let result = isSupportedCache[key];
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if (!result) {
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result = (0, _caniuseApi.isSupported)(feature, browsers);
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isSupportedCache[key] = result;
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}
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return result;
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}
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function ensureCompatibility(selectors, browsers, compatibilityCache) {
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// Should not merge mixins
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if (selectors.some(isCssMixin)) {
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return false;
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}
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return selectors.every(selector => {
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if (simpleSelectorRe.test(selector)) {
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return true;
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}
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if (compatibilityCache && selector in compatibilityCache) {
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return compatibilityCache[selector];
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}
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let compatible = true;
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(0, _postcssSelectorParser2.default)(ast => {
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ast.walk(node => {
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const { type, value } = node;
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if (type === 'pseudo') {
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const entry = pseudoElements[value];
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if (entry && compatible) {
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compatible = isSupportedCached(entry, browsers);
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}
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}
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if (type === 'combinator') {
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if (~value.indexOf('~')) {
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compatible = isSupportedCached(cssSel3, browsers);
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}
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if (~value.indexOf('>') || ~value.indexOf('+')) {
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compatible = isSupportedCached(cssSel2, browsers);
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}
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}
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if (type === 'attribute' && node.attribute) {
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// [foo]
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if (!node.operator) {
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compatible = isSupportedCached(cssSel2, browsers);
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}
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if (value) {
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// [foo="bar"], [foo~="bar"], [foo|="bar"]
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if (~['=', '~=', '|='].indexOf(node.operator)) {
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compatible = isSupportedCached(cssSel2, browsers);
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}
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// [foo^="bar"], [foo$="bar"], [foo*="bar"]
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if (~['^=', '$=', '*='].indexOf(node.operator)) {
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compatible = isSupportedCached(cssSel3, browsers);
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}
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}
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// [foo="bar" i]
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if (node.insensitive) {
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compatible = isSupportedCached('css-case-insensitive', browsers);
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}
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}
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if (!compatible) {
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// If this node was not compatible,
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// break out early from walking the rest
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return false;
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}
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});
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}).processSync(selector);
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if (compatibilityCache) {
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compatibilityCache[selector] = compatible;
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}
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return compatible;
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});
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} |