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76 lines
1.9 KiB
Text
76 lines
1.9 KiB
Text
'use strict';
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const { unit } = require('postcss-value-parser');
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const { getArguments } = require('cssnano-utils');
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const addSpace = require('../lib/addSpace');
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const getValue = require('../lib/getValue');
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// transition: [ none | <single-transition-property> ] || <time> || <single-transition-timing-function> || <time>
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const timingFunctions = new Set([
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'ease',
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'linear',
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'ease-in',
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'ease-out',
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'ease-in-out',
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'step-start',
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'step-end',
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]);
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/**
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* @param {import('postcss-value-parser').Node[][]} args
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* @return {import('postcss-value-parser').Node[][]}
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*/
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function normalize(args) {
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const list = [];
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for (const arg of args) {
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/** @type {Record<string, import('postcss-value-parser').Node[]>} */
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let state = {
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timingFunction: [],
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property: [],
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time1: [],
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time2: [],
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};
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arg.forEach((node) => {
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const { type, value } = node;
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if (type === 'space') {
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return;
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}
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if (
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type === 'function' &&
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new Set(['steps', 'cubic-bezier']).has(value.toLowerCase())
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) {
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state.timingFunction = [...state.timingFunction, node, addSpace()];
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} else if (unit(value)) {
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if (!state.time1.length) {
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state.time1 = [...state.time1, node, addSpace()];
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} else {
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state.time2 = [...state.time2, node, addSpace()];
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}
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} else if (timingFunctions.has(value.toLowerCase())) {
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state.timingFunction = [...state.timingFunction, node, addSpace()];
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} else {
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state.property = [...state.property, node, addSpace()];
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}
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});
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list.push([
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...state.property,
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...state.time1,
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...state.timingFunction,
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...state.time2,
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]);
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}
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return list;
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}
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/**
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* @param {import('postcss-value-parser').ParsedValue} parsed
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* @return {string}
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*/
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module.exports = function normalizeTransition(parsed) {
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const values = normalize(getArguments(parsed));
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return getValue(values);
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};
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