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const postcss = require('postcss');
const _ = require('lodash');
const shorthandData = require('./shorthandData');
module.exports = {
sortDeclarations,
sortDeclarationsAlphabetically,
sortByIndexes,
};
function sortDeclarations(a, b) {
// If unprefixed prop names are the same, compare the prefixed versions
if (a.node.type === 'decl' && b.node.type === 'decl' && a.unprefixedName === b.unprefixedName) {
// If first property has no prefix and second property has prefix
if (!postcss.vendor.prefix(a.name).length && postcss.vendor.prefix(b.name).length) {
return 1;
}
if (postcss.vendor.prefix(a.name).length && !postcss.vendor.prefix(b.name).length) {
return -1;
}
}
if (!_.isUndefined(a.orderData) && !_.isUndefined(b.orderData)) {
// If a and b have the same group index, and a's property index is
// higher than b's property index, in a sorted list a appears after
// b:
if (a.orderData.propertyIndex !== b.orderData.propertyIndex) {
return a.orderData.propertyIndex - b.orderData.propertyIndex;
}
}
if (
a.unspecifiedPropertiesPosition === 'bottom' ||
a.unspecifiedPropertiesPosition === 'bottomAlphabetical' ||
b.unspecifiedPropertiesPosition === 'bottomAlphabetical'
) {
if (!_.isUndefined(a.orderData) && _.isUndefined(b.orderData)) {
return -1;
}
if (_.isUndefined(a.orderData) && !_.isUndefined(b.orderData)) {
return 1;
}
}
if (a.unspecifiedPropertiesPosition === 'top') {
if (!_.isUndefined(a.orderData) && _.isUndefined(b.orderData)) {
return 1;
}
if (_.isUndefined(a.orderData) && !_.isUndefined(b.orderData)) {
return -1;
}
}
if (a.unspecifiedPropertiesPosition === 'bottomAlphabetical') {
if (_.isUndefined(a.orderData) && _.isUndefined(b.orderData)) {
return sortDeclarationsAlphabetically(a, b);
}
}
// If a and b have the same group index and the same property index,
// in a sorted list they appear in the same order they were in
// original array:
return a.initialIndex - b.initialIndex;
}
function isShorthand(a, b) {
const longhands = shorthandData[a] || [];
return longhands.includes(b);
}
function sortDeclarationsAlphabetically(a, b) {
if (isShorthand(a.unprefixedName, b.unprefixedName)) {
return -1;
}
if (isShorthand(b.unprefixedName, a.unprefixedName)) {
return 1;
}
if (a.unprefixedName === b.unprefixedName) {
if (a.node.type === 'decl' && b.node.type === 'decl') {
// If first property has no prefix and second property has prefix
if (!postcss.vendor.prefix(a.name).length && postcss.vendor.prefix(b.name).length) {
return 1;
}
if (postcss.vendor.prefix(a.name).length && !postcss.vendor.prefix(b.name).length) {
return -1;
}
}
return a.initialIndex - b.initialIndex;
}
return a.unprefixedName <= b.unprefixedName ? -1 : 1;
}
function sortByIndexes(a, b) {
// If a and b have the same group index, and a's property index is
// higher than b's property index, in a sorted list a appears after
// b:
if (a.position !== b.position) {
return a.position - b.position;
}
// If a and b have the same group index and the same property index,
// in a sorted list they appear in the same order they were in
// original array:
return a.initialIndex - b.initialIndex;
}