141 lines
3.7 KiB
JavaScript
141 lines
3.7 KiB
JavaScript
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const hasOwnProperty = Object.prototype.hasOwnProperty;
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const shape = {
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generic: true,
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types: appendOrAssign,
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atrules: {
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prelude: appendOrAssignOrNull,
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descriptors: appendOrAssignOrNull
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},
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properties: appendOrAssign,
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parseContext: assign,
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scope: deepAssign,
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atrule: ['parse'],
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pseudo: ['parse'],
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node: ['name', 'structure', 'parse', 'generate', 'walkContext']
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};
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function isObject(value) {
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return value && value.constructor === Object;
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}
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function copy(value) {
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return isObject(value)
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? Object.assign({}, value)
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: value;
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}
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function assign(dest, src) {
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return Object.assign(dest, src);
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}
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function deepAssign(dest, src) {
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for (const key in src) {
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if (hasOwnProperty.call(src, key)) {
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if (isObject(dest[key])) {
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deepAssign(dest[key], copy(src[key]));
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} else {
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dest[key] = copy(src[key]);
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}
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}
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}
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return dest;
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}
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function append(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 appendOrAssign(a, b) {
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if (typeof b === 'string') {
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return append(a, b);
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}
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const result = Object.assign({}, a);
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for (let key in b) {
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if (hasOwnProperty.call(b, key)) {
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result[key] = append(hasOwnProperty.call(a, key) ? a[key] : undefined, b[key]);
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}
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}
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return result;
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}
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function appendOrAssignOrNull(a, b) {
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const result = appendOrAssign(a, b);
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return !isObject(result) || Object.keys(result).length
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? result
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: null;
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}
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function mix(dest, src, shape) {
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for (const key in shape) {
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if (hasOwnProperty.call(shape, key) === false) {
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continue;
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}
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if (shape[key] === true) {
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if (key in src) {
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if (hasOwnProperty.call(src, key)) {
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dest[key] = copy(src[key]);
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}
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}
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} else if (shape[key]) {
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if (typeof shape[key] === 'function') {
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const fn = shape[key];
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dest[key] = fn({}, dest[key]);
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dest[key] = fn(dest[key] || {}, src[key]);
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} else if (isObject(shape[key])) {
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const result = {};
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for (let name in dest[key]) {
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result[name] = mix({}, dest[key][name], shape[key]);
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}
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for (let name in src[key]) {
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result[name] = mix(result[name] || {}, src[key][name], shape[key]);
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}
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dest[key] = result;
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} else if (Array.isArray(shape[key])) {
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const res = {};
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const innerShape = shape[key].reduce(function(s, k) {
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s[k] = true;
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return s;
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}, {});
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for (const [name, value] of Object.entries(dest[key] || {})) {
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res[name] = {};
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if (value) {
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mix(res[name], value, innerShape);
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}
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}
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for (const name in src[key]) {
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if (hasOwnProperty.call(src[key], name)) {
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if (!res[name]) {
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res[name] = {};
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}
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if (src[key] && src[key][name]) {
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mix(res[name], src[key][name], innerShape);
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}
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}
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}
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dest[key] = res;
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}
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}
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}
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return dest;
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}
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module.exports = (dest, src) => mix(dest, src, shape);
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