116 lines
3.5 KiB
JavaScript
116 lines
3.5 KiB
JavaScript
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function appendOrSet(a, b) {
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if (typeof b === 'string' && /^\s*\|/.test(b)) {
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return typeof a === 'string'
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? a + b
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: b.replace(/^\s*\|\s*/, '');
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}
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return b || null;
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}
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function sliceProps(obj, props) {
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const result = Object.create(null);
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for (const [key, value] of Object.entries(obj)) {
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if (value) {
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result[key] = {};
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for (const prop of Object.keys(value)) {
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if (props.includes(prop)) {
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result[key][prop] = value[prop];
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}
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}
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}
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}
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return result;
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}
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export default function mix(dest, src) {
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const result = { ...dest };
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for (const [prop, value] of Object.entries(src)) {
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switch (prop) {
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case 'generic':
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result[prop] = Boolean(value);
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break;
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case 'units':
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result[prop] = { ...dest[prop] };
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for (const [name, patch] of Object.entries(value)) {
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result[prop][name] = Array.isArray(patch) ? patch : [];
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}
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break;
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case 'atrules':
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result[prop] = { ...dest[prop] };
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for (const [name, atrule] of Object.entries(value)) {
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const exists = result[prop][name] || {};
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const current = result[prop][name] = {
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prelude: exists.prelude || null,
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descriptors: {
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...exists.descriptors
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}
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};
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if (!atrule) {
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continue;
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}
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current.prelude = atrule.prelude
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? appendOrSet(current.prelude, atrule.prelude)
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: current.prelude || null;
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for (const [descriptorName, descriptorValue] of Object.entries(atrule.descriptors || {})) {
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current.descriptors[descriptorName] = descriptorValue
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? appendOrSet(current.descriptors[descriptorName], descriptorValue)
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: null;
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}
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if (!Object.keys(current.descriptors).length) {
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current.descriptors = null;
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}
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}
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break;
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case 'types':
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case 'properties':
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result[prop] = { ...dest[prop] };
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for (const [name, syntax] of Object.entries(value)) {
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result[prop][name] = appendOrSet(result[prop][name], syntax);
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}
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break;
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case 'scope':
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result[prop] = { ...dest[prop] };
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for (const [name, props] of Object.entries(value)) {
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result[prop][name] = { ...result[prop][name], ...props };
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}
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break;
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case 'parseContext':
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result[prop] = {
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...dest[prop],
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...value
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};
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break;
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case 'atrule':
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case 'pseudo':
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result[prop] = {
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...dest[prop],
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...sliceProps(value, ['parse']) };
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break;
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case 'node':
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result[prop] = {
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...dest[prop],
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...sliceProps(value, ['name', 'structure', 'parse', 'generate', 'walkContext'])
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};
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break;
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}
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}
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return result;
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}
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