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149 lines
3.9 KiB
149 lines
3.9 KiB
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _postcss = require('postcss');
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var _postcssValueParser = require('postcss-value-parser');
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var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
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var _cssnanoUtilGetArguments = require('cssnano-util-get-arguments');
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var _cssnanoUtilGetArguments2 = _interopRequireDefault(_cssnanoUtilGetArguments);
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var _has = require('has');
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var _has2 = _interopRequireDefault(_has);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const directions = ['top', 'right', 'bottom', 'left', 'center'];
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const center = '50%';
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const horizontal = {
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right: '100%',
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left: '0'
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};
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const vertical = {
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bottom: '100%',
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top: '0'
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};
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function transform(value) {
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const parsed = (0, _postcssValueParser2.default)(value);
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const args = (0, _cssnanoUtilGetArguments2.default)(parsed);
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const relevant = [];
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args.forEach(arg => {
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relevant.push({
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start: null,
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end: null
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});
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arg.forEach((part, index) => {
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const isPosition = ~directions.indexOf(part.value.toLowerCase()) || (0, _postcssValueParser.unit)(part.value);
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const len = relevant.length - 1;
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if (relevant[len].start === null && isPosition) {
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relevant[len].start = index;
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relevant[len].end = index;
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return;
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}
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if (relevant[len].start !== null) {
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if (part.type === 'space') {
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return;
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} else if (isPosition) {
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relevant[len].end = index;
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return;
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}
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return;
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}
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});
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});
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relevant.forEach((range, index) => {
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if (range.start === null) {
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return;
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}
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const position = args[index].slice(range.start, range.end + 1);
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if (position.length > 3) {
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return;
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}
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const firstValue = position[0].value.toLowerCase();
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const secondValue = position[2] && position[2].value ? position[2].value.toLowerCase() : null;
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if (position.length === 1 || secondValue === 'center') {
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if (secondValue) {
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position[2].value = position[1].value = '';
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}
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const map = Object.assign({}, horizontal, {
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center
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});
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if ((0, _has2.default)(map, firstValue)) {
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position[0].value = map[firstValue];
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}
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return;
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}
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if (firstValue === 'center' && ~directions.indexOf(secondValue)) {
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position[0].value = position[1].value = '';
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if ((0, _has2.default)(horizontal, secondValue)) {
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position[2].value = horizontal[secondValue];
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}
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return;
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}
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if ((0, _has2.default)(horizontal, firstValue) && (0, _has2.default)(vertical, secondValue)) {
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position[0].value = horizontal[firstValue];
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position[2].value = vertical[secondValue];
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return;
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} else if ((0, _has2.default)(vertical, firstValue) && (0, _has2.default)(horizontal, secondValue)) {
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position[0].value = horizontal[secondValue];
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position[2].value = vertical[firstValue];
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return;
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}
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});
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return parsed.toString();
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}
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exports.default = (0, _postcss.plugin)('postcss-normalize-positions', () => {
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return css => {
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const cache = {};
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css.walkDecls(/^(background(-position)?|(-webkit-)?perspective-origin)$/i, decl => {
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const value = decl.value;
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if (cache[value]) {
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decl.value = cache[value];
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return;
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}
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const result = transform(value);
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decl.value = result;
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cache[value] = result;
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});
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};
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});
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module.exports = exports['default'];
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