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Viewing file:     createNode.js (3.01 KB)      -rw-r--r--

import { Alias } from '../nodes/Alias.js';
import { isNode, isPair, MAP, SEQ, isDocument } from '../nodes/identity.js';
import { Scalar } from '../nodes/Scalar.js';

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

export { createNode };