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86 lines
2.8 KiB
86 lines
2.8 KiB
2 years ago
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import { Alias } from '../nodes/Alias.js';
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import { isNode, isPair, MAP, SEQ, isDocument } from '../nodes/Node.js';
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import { Scalar } from '../nodes/Scalar.js';
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const defaultTagPrefix = 'tag:yaml.org,2002:';
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function findTagObject(value, tagName, tags) {
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if (tagName) {
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const match = tags.filter(t => t.tag === tagName);
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const tagObj = match.find(t => !t.format) ?? match[0];
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if (!tagObj)
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throw new Error(`Tag ${tagName} not found`);
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return tagObj;
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}
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return tags.find(t => t.identify?.(value) && !t.format);
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}
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function createNode(value, tagName, ctx) {
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if (isDocument(value))
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value = value.contents;
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if (isNode(value))
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return value;
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if (isPair(value)) {
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const map = ctx.schema[MAP].createNode?.(ctx.schema, null, ctx);
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map.items.push(value);
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return map;
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}
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if (value instanceof String ||
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value instanceof Number ||
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value instanceof Boolean ||
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(typeof BigInt !== 'undefined' && value instanceof BigInt) // not supported everywhere
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) {
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// https://tc39.es/ecma262/#sec-serializejsonproperty
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value = value.valueOf();
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}
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const { aliasDuplicateObjects, onAnchor, onTagObj, schema, sourceObjects } = ctx;
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// Detect duplicate references to the same object & use Alias nodes for all
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// after first. The `ref` wrapper allows for circular references to resolve.
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let ref = undefined;
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if (aliasDuplicateObjects && value && typeof value === 'object') {
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ref = sourceObjects.get(value);
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if (ref) {
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if (!ref.anchor)
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ref.anchor = onAnchor(value);
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return new Alias(ref.anchor);
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}
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else {
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ref = { anchor: null, node: null };
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sourceObjects.set(value, ref);
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}
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}
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if (tagName?.startsWith('!!'))
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tagName = defaultTagPrefix + tagName.slice(2);
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let tagObj = findTagObject(value, tagName, schema.tags);
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if (!tagObj) {
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if (value && typeof value.toJSON === 'function') {
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// eslint-disable-next-line @typescript-eslint/no-unsafe-call
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value = value.toJSON();
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}
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if (!value || typeof value !== 'object') {
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const node = new Scalar(value);
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if (ref)
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ref.node = node;
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return node;
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}
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tagObj =
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value instanceof Map
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? schema[MAP]
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: Symbol.iterator in Object(value)
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? schema[SEQ]
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: schema[MAP];
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}
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if (onTagObj) {
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onTagObj(tagObj);
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delete ctx.onTagObj;
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}
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const node = tagObj?.createNode
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? tagObj.createNode(ctx.schema, value, ctx)
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: new Scalar(value);
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if (tagName)
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node.tag = tagName;
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if (ref)
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ref.node = node;
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return node;
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}
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export { createNode };
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