69 lines
2.5 KiB
JavaScript
69 lines
2.5 KiB
JavaScript
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'use strict';
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var identity = require('../../nodes/identity.js');
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var Scalar = require('../../nodes/Scalar.js');
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// If the value associated with a merge key is a single mapping node, each of
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// its key/value pairs is inserted into the current mapping, unless the key
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// already exists in it. If the value associated with the merge key is a
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// sequence, then this sequence is expected to contain mapping nodes and each
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// of these nodes is merged in turn according to its order in the sequence.
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// Keys in mapping nodes earlier in the sequence override keys specified in
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// later mapping nodes. -- http://yaml.org/type/merge.html
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const MERGE_KEY = '<<';
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const merge = {
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identify: value => value === MERGE_KEY ||
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(typeof value === 'symbol' && value.description === MERGE_KEY),
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default: 'key',
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tag: 'tag:yaml.org,2002:merge',
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test: /^<<$/,
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resolve: () => Object.assign(new Scalar.Scalar(Symbol(MERGE_KEY)), {
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addToJSMap: addMergeToJSMap
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}),
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stringify: () => MERGE_KEY
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};
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const isMergeKey = (ctx, key) => (merge.identify(key) ||
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(identity.isScalar(key) &&
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(!key.type || key.type === Scalar.Scalar.PLAIN) &&
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merge.identify(key.value))) &&
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ctx?.doc.schema.tags.some(tag => tag.tag === merge.tag && tag.default);
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function addMergeToJSMap(ctx, map, value) {
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value = ctx && identity.isAlias(value) ? value.resolve(ctx.doc) : value;
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if (identity.isSeq(value))
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for (const it of value.items)
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mergeValue(ctx, map, it);
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else if (Array.isArray(value))
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for (const it of value)
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mergeValue(ctx, map, it);
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else
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mergeValue(ctx, map, value);
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}
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function mergeValue(ctx, map, value) {
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const source = ctx && identity.isAlias(value) ? value.resolve(ctx.doc) : value;
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if (!identity.isMap(source))
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throw new Error('Merge sources must be maps or map aliases');
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const srcMap = source.toJSON(null, ctx, Map);
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for (const [key, value] of srcMap) {
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if (map instanceof Map) {
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if (!map.has(key))
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map.set(key, value);
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}
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else if (map instanceof Set) {
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map.add(key);
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}
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else if (!Object.prototype.hasOwnProperty.call(map, key)) {
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Object.defineProperty(map, key, {
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value,
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writable: true,
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enumerable: true,
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configurable: true
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});
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}
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}
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return map;
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}
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exports.addMergeToJSMap = addMergeToJSMap;
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exports.isMergeKey = isMergeKey;
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exports.merge = merge;
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