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refactor: optimize postcss task (#5085)
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| X8vjgfCUlDRvJz9L9e5OzLqCCdQ= | ||
| owW4JG1/w/h6BH4GK+Akd5v6xzc= |
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178 changes: 178 additions & 0 deletions
178
packages/tools/lib/postcss-combine-duplicated-selectors/index.js
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| /* | ||
| The MIT License (MIT) | ||
| Copyright (c) 2016 Christian Murphy | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| */ | ||
|
|
||
| const parser = require('postcss-selector-parser'); | ||
| const name = "postcss-combine-duplicated-selectors"; | ||
|
|
||
| /** | ||
| * Ensure that attributes with different quotes match. | ||
| * @param {Object} selector - postcss selector node | ||
| */ | ||
| function normalizeAttributes(selector) { | ||
| selector.walkAttributes((node) => { | ||
| if (node.value) { | ||
| // remove quotes | ||
| node.value = node.value.replace(/'|\\'|"|\\"/g, ''); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Sort class and id groups alphabetically | ||
| * @param {Object} selector - postcss selector node | ||
| */ | ||
| function sortGroups(selector) { | ||
| selector.each((subSelector) => { | ||
| subSelector.nodes.sort((a, b) => { | ||
| // different types cannot be sorted | ||
| if (a.type !== b.type) { | ||
| return 0; | ||
| } | ||
|
|
||
| // sort alphabetically | ||
| return a.value < b.value ? -1 : 1; | ||
| }); | ||
| }); | ||
|
|
||
| selector.sort((a, b) => (a.nodes.join('') < b.nodes.join('') ? -1 : 1)); | ||
| } | ||
|
|
||
| /** | ||
| * Remove duplicated properties | ||
| * @param {Object} selector - postcss selector node | ||
| * @param {Boolean} exact | ||
| */ | ||
| function removeDupProperties(selector, exact) { | ||
| if (!exact) { // Remove duplicated properties, regardless of value | ||
| const retainedProps = new Set(); | ||
|
|
||
| for (let actIndex = selector.nodes.length - 1; actIndex >= 1; actIndex--) { | ||
| const prop = selector.nodes[actIndex].prop; | ||
| if (prop !== undefined) { | ||
| if (!retainedProps.has(prop)) { | ||
| retainedProps.add(prop); // Mark the prop as retained, all other occurrences must be removed | ||
| } else { | ||
| selector.nodes[actIndex].remove(); // This occurrence of the prop must be removed | ||
| } | ||
| } | ||
| } | ||
| } else { | ||
| // Remove duplicated properties from bottom to top () | ||
| for (let actIndex = selector.nodes.length - 1; actIndex >= 1; actIndex--) { | ||
| for (let befIndex = actIndex - 1; befIndex >= 0; befIndex--) { | ||
| if ( | ||
| selector.nodes[actIndex].prop === selector.nodes[befIndex].prop && | ||
| selector.nodes[actIndex].value === selector.nodes[befIndex].value | ||
| ) { | ||
| selector.nodes[befIndex].remove(); | ||
| actIndex--; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| const uniformStyle = parser((selector) => { | ||
| normalizeAttributes(selector); | ||
| sortGroups(selector); | ||
| }); | ||
|
|
||
| const defaultOptions = { | ||
| removeDuplicatedProperties: false, | ||
| }; | ||
|
|
||
| module.exports = (options) => { | ||
| options = Object.assign({}, defaultOptions, options); | ||
| return { | ||
| postcssPlugin: name, | ||
| prepare() { | ||
| // Create a map to store maps | ||
| const mapTable = new Map(); | ||
| // root map to store root selectors | ||
| mapTable.set('root', new Map()); | ||
|
|
||
| return { | ||
| Rule: (rule) => { | ||
| let map; | ||
| // Check selector parent for any at rule | ||
| if (rule.parent.type === 'atrule') { | ||
| // Use name and query params as the key | ||
| const query = | ||
| rule.parent.name.toLowerCase() + | ||
| rule.parent.params.replace(/\s+/g, ''); | ||
|
|
||
| // See if this query key is already in the map table | ||
| map = mapTable.has(query) ? // If it is use it | ||
| mapTable.get(query) : // if not set it and get it | ||
| mapTable.set(query, new Map()).get(query); | ||
| } else { | ||
| // Otherwise we are dealing with a selector in the root | ||
| map = mapTable.get('root'); | ||
| } | ||
|
|
||
| // create a uniform selector | ||
| const selector = uniformStyle.processSync(rule.selector, { | ||
| lossless: false, | ||
| }); | ||
|
|
||
| if (map.has(selector)) { | ||
| // store original rule as destination | ||
| const destination = map.get(selector); | ||
|
|
||
| // check if node has already been processed | ||
| if (destination === rule) return; | ||
|
|
||
| // move declarations to original rule | ||
| while (rule.nodes.length > 0) { | ||
| destination.append(rule.nodes[0]); | ||
| } | ||
| // remove duplicated rule | ||
| rule.remove(); | ||
|
|
||
| if ( | ||
| options.removeDuplicatedProperties || | ||
| options.removeDuplicatedValues | ||
| ) { | ||
| removeDupProperties( | ||
| destination, | ||
| options.removeDuplicatedValues, | ||
| ); | ||
| } | ||
| } else { | ||
| if ( | ||
| options.removeDuplicatedProperties || | ||
| options.removeDuplicatedValues | ||
| ) { | ||
| removeDupProperties(rule, options.removeDuplicatedValues); | ||
| } | ||
| // add new selector to symbol table | ||
| map.set(selector, rule); | ||
| } | ||
| }, | ||
| }; | ||
| }, | ||
| }; | ||
| }; | ||
|
|
||
| module.exports.postcss = true; |
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