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'use strict';
const fs = require('fs');
const path = require('path');
const postcss = require('postcss');
const timsort = require('timsort').sort;
module.exports = postcss.plugin('css-declaration-sorter', function (options) {
return function (css) {
let sortOrderPath;
options = options || {};
// Use included sorting order if order is passed and not alphabetically
if (options.order && options.order !== 'alphabetically') {
sortOrderPath = path.join(__dirname, '../orders/', options.order) + '.json';
} else if (options.customOrder) {
sortOrderPath = options.customOrder;
} else {
// Fallback to the default sorting order
return processCss(css, 'alphabetically');
}
// Load in the array containing the order from a JSON file
return new Promise(function (resolve, reject) {
fs.readFile(sortOrderPath, function (error, data) {
if (error) return reject(error);
resolve(data);
});
}).then(function (data) {
return processCss(css, JSON.parse(data));
});
};
});
function processCss (css, sortOrder) {
const comments = [];
const rulesCache = [];
css.walk(function (node) {
const nodes = node.nodes;
const type = node.type;
if (type === 'comment') {
// Don't do anything to root comments or the last newline comment
const isNewlineNode = ~node.raws.before.indexOf('\n');
const lastNewlineNode = isNewlineNode && !node.next();
const onlyNode = !node.prev() && !node.next();
if (lastNewlineNode || onlyNode || node.parent.type === 'root') {
return;
}
if (isNewlineNode) {
const pairedNode = node.next() ? node.next() : node.prev().prev();
if (pairedNode) {
comments.unshift({
'comment': node,
'pairedNode': pairedNode,
'insertPosition': node.next() ? 'Before' : 'After',
});
node.remove();
}
} else {
const pairedNode = node.prev() ? node.prev() : node.next().next();
if (pairedNode) {
comments.push({
'comment': node,
'pairedNode': pairedNode,
'insertPosition': 'After',
});
node.remove();
}
}
return;
}
// Add rule-like nodes to a cache so that we can remove all
// comment nodes before we start sorting.
const isRule = type === 'rule' || type === 'atrule';
if (isRule && nodes && nodes.length > 1) {
rulesCache.push(nodes);
}
});
// Perform a sort once all comment nodes are removed
rulesCache.forEach(function (nodes) {
sortCssDecls(nodes, sortOrder);
});
// Add comments back to the nodes they are paired with
comments.forEach(function (node) {
const pairedNode = node.pairedNode;
node.comment.remove();
pairedNode.parent['insert' + node.insertPosition](pairedNode, node.comment);
});
}
// Sort CSS declarations alphabetically or using the set sorting order
function sortCssDecls (cssDecls, sortOrder) {
if (sortOrder === 'alphabetically') {
timsort(cssDecls, function (a, b) {
if (a.type === 'decl' && b.type === 'decl') {
return comparator(a.prop, b.prop);
} else {
return compareDifferentType(a, b);
}
});
} else {
timsort(cssDecls, function (a, b) {
if (a.type === 'decl' && b.type === 'decl') {
const aIndex = sortOrder.indexOf(a.prop);
const bIndex = sortOrder.indexOf(b.prop);
return comparator(aIndex, bIndex);
} else {
return compareDifferentType(a, b);
}
});
}
}
function comparator (a, b) {
return a === b ? 0 : a < b ? -1 : 1;
}
function compareDifferentType (a, b) {
if (b.type === 'atrule') { return 0; }
return (a.type === 'decl') ? -1 : (b.type === 'decl') ? 1 : 0;
}