93 lines
2.4 KiB
JavaScript
93 lines
2.4 KiB
JavaScript
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var ASSERT = require('assert');
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var list = require('./list');
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var props = require('css-shorthand-properties').shorthandProperties;
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exports.isShorthand = isShorthand;
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exports.expand = expand;
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/**
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* Expand a property to an array of parts or property and value to object
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*
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* @param {string} property
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* @param {?string} value
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* @param {?boolean} recurse
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* @returns {Array|Object}
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*/
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function expand(property, value, recurse) {
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ASSERT(arguments.length, 'property argument is required');
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if (arguments.length < 3) {
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if (typeof value === 'boolean') {
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recurse = value;
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value = undefined;
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} else {
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recurse = true;
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}
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}
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var undefvalue = typeof value === 'undefined';
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return undefvalue?
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expandAsArray(property, recurse)
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: expandAsObject(property, value, recurse);
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}
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function expandAsArray(property, recurse) {
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if (!props.hasOwnProperty(property)) {
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return [property];
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}
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return props[property]
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.map(function (p) {
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var longhand = p.substr(0, 1) === '-' ? property + p : p;
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return recurse ? expand(longhand, recurse) : longhand;
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})
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.reduce(function (res, cur) {
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return res.concat(cur);
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}, []);
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}
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/**
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* expandAsObject
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*
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* @param {string} property - Source property name
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* @param {string|string[]} value - Source property value
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* @param {boolean} recurse - Flag to expand recursively
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* @return {Object} - Resulting object
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*/
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function expandAsObject(property, value, recurse) {
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var res = {};
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if (!props.hasOwnProperty(property)) {
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res[property] = value;
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return res;
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}
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var subs = expandAsArray(property, false);
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if (typeof value === 'string') {
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value = list.space(value);
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}
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for (var i = 0, j, l = subs.length, jl = value.length; i < l; i++) {
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j = i < jl ? i : (jl < 2 ? 0 : i % 2);
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if (recurse) {
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var recRes = expandAsObject(subs[i], value[j], recurse);
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var keys = Object.keys(recRes);
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for (var ri = 0, rl = keys.length; ri < rl; ri++) {
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res[keys[ri]] = recRes[keys[ri]];
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}
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} else {
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res[subs[i]] = value[j];
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}
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}
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return res;
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}
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function isShorthand(property) {
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if (props.hasOwnProperty(property)) {
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return true;
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}
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return false;
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}
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