119 lines
3.9 KiB
JavaScript
119 lines
3.9 KiB
JavaScript
'use strict';
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exports.__esModule = true;
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var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
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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 _has = require('has');
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var _has2 = _interopRequireDefault(_has);
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var _getArguments = require('./getArguments');
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var _getArguments2 = _interopRequireDefault(_getArguments);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var directions = ['top', 'right', 'bottom', 'left', 'center'];
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var properties = ['background', 'background-position', '-webkit-perspective-origin', 'perspective-origin'];
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var center = '50%';
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var horizontal = {
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right: '100%',
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left: '0'
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};
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var vertical = {
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bottom: '100%',
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top: '0'
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};
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function transform(decl) {
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if (!~properties.indexOf(decl.prop)) {
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return;
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}
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var values = (0, _postcssValueParser2.default)(decl.value);
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var args = (0, _getArguments2.default)(values);
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var relevant = [];
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args.forEach(function (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(function (part, index) {
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var isPosition = ~directions.indexOf(part.value) || (0, _postcssValueParser.unit)(part.value);
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var 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(function (range, index) {
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if (range.start === null) {
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return;
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}
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var 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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if (position.length === 1 || position[2].value === 'center') {
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if (position[2]) {
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position[2].value = position[1].value = '';
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}
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var value = position[0].value;
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var map = _extends({}, horizontal, {
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center: center
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});
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if ((0, _has2.default)(map, value)) {
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position[0].value = map[value];
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}
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return;
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}
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if (position[0].value === 'center' && ~directions.indexOf(position[2].value)) {
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position[0].value = position[1].value = '';
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var _value = position[2].value;
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if ((0, _has2.default)(horizontal, _value)) {
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position[2].value = horizontal[_value];
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}
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return;
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}
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if ((0, _has2.default)(horizontal, position[0].value) && (0, _has2.default)(vertical, position[2].value)) {
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position[0].value = horizontal[position[0].value];
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position[2].value = vertical[position[2].value];
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return;
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} else if ((0, _has2.default)(vertical, position[0].value) && (0, _has2.default)(horizontal, position[2].value)) {
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var first = position[0].value;
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position[0].value = horizontal[position[2].value];
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position[2].value = vertical[first];
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return;
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}
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});
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decl.value = values.toString();
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}
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exports.default = (0, _postcss.plugin)('cssnano-reduce-positions', function () {
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return function (css) {
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return css.walkDecls(transform);
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};
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});
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module.exports = exports['default']; |