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152 lines
4.2 KiB
152 lines
4.2 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 _stylehacks = require('stylehacks');
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var _canMerge = require('../canMerge');
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var _canMerge2 = _interopRequireDefault(_canMerge);
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var _getDecls = require('../getDecls');
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var _getDecls2 = _interopRequireDefault(_getDecls);
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var _getValue = require('../getValue');
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var _getValue2 = _interopRequireDefault(_getValue);
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var _mergeRules = require('../mergeRules');
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var _mergeRules2 = _interopRequireDefault(_mergeRules);
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var _insertCloned = require('../insertCloned');
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var _insertCloned2 = _interopRequireDefault(_insertCloned);
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var _remove = require('../remove');
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var _remove2 = _interopRequireDefault(_remove);
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var _isCustomProp = require('../isCustomProp');
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var _isCustomProp2 = _interopRequireDefault(_isCustomProp);
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var _canExplode = require('../canExplode');
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var _canExplode2 = _interopRequireDefault(_canExplode);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const properties = ['column-width', 'column-count'];
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const auto = 'auto';
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const inherit = 'inherit';
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/**
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* Normalize a columns shorthand definition. Both of the longhand
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* properties' initial values are 'auto', and as per the spec,
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* omitted values are set to their initial values. Thus, we can
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* remove any 'auto' definition when there are two values.
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*
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* Specification link: https://www.w3.org/TR/css3-multicol/
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*/
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function normalize(values) {
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if (values[0].toLowerCase() === auto) {
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return values[1];
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}
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if (values[1].toLowerCase() === auto) {
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return values[0];
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}
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if (values[0].toLowerCase() === inherit && values[1].toLowerCase() === inherit) {
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return inherit;
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}
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return values.join(' ');
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}
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function explode(rule) {
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rule.walkDecls(/^columns$/i, decl => {
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if (!(0, _canExplode2.default)(decl)) {
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return;
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}
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if ((0, _stylehacks.detect)(decl)) {
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return;
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}
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let values = _postcss.list.space(decl.value);
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if (values.length === 1) {
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values.push(auto);
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}
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values.forEach((value, i) => {
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let prop = properties[1];
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if (value.toLowerCase() === auto) {
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prop = properties[i];
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} else if ((0, _postcssValueParser.unit)(value).unit) {
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prop = properties[0];
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}
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(0, _insertCloned2.default)(decl.parent, decl, {
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prop,
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value
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});
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});
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decl.remove();
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});
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}
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function cleanup(rule) {
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let decls = (0, _getDecls2.default)(rule, ['columns'].concat(properties));
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while (decls.length) {
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const lastNode = decls[decls.length - 1];
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// remove properties of lower precedence
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const lesser = decls.filter(node => !(0, _stylehacks.detect)(lastNode) && !(0, _stylehacks.detect)(node) && node !== lastNode && node.important === lastNode.important && lastNode.prop === 'columns' && node.prop !== lastNode.prop);
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lesser.forEach(_remove2.default);
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decls = decls.filter(node => !~lesser.indexOf(node));
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// get duplicate properties
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let duplicates = decls.filter(node => !(0, _stylehacks.detect)(lastNode) && !(0, _stylehacks.detect)(node) && node !== lastNode && node.important === lastNode.important && node.prop === lastNode.prop && !(!(0, _isCustomProp2.default)(node) && (0, _isCustomProp2.default)(lastNode)));
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duplicates.forEach(_remove2.default);
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decls = decls.filter(node => node !== lastNode && !~duplicates.indexOf(node));
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}
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}
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function merge(rule) {
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(0, _mergeRules2.default)(rule, properties, (rules, lastNode) => {
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if ((0, _canMerge2.default)(rules) && !rules.some(_stylehacks.detect)) {
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(0, _insertCloned2.default)(lastNode.parent, lastNode, {
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prop: 'columns',
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value: normalize(rules.map(_getValue2.default))
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});
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rules.forEach(_remove2.default);
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return true;
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}
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});
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cleanup(rule);
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}
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exports.default = {
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explode,
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merge
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};
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module.exports = exports['default'];
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