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Dir : ~/usr/share/node_modules/yaml/browser/dist/nodes/

Edit File: addPairToJSMap.js

import { warn } from '../log.js';
import { createStringifyContext } from '../stringify/stringify.js';
import { isAlias, isSeq, isScalar, isMap, isNode } from './Node.js';
import { Scalar } from './Scalar.js';
import { toJS } from './toJS.js';

const MERGE_KEY = '<<';
function addPairToJSMap(ctx, map, { key, value }) {
    if (ctx?.doc.schema.merge && isMergeKey(key)) {
        value = isAlias(value) ? value.resolve(ctx.doc) : value;
        if (isSeq(value))
            for (const it of value.items)
                mergeToJSMap(ctx, map, it);
        else if (Array.isArray(value))
            for (const it of value)
                mergeToJSMap(ctx, map, it);
        else
            mergeToJSMap(ctx, map, value);
    }
    else {
        const jsKey = toJS(key, '', ctx);
        if (map instanceof Map) {
            map.set(jsKey, toJS(value, jsKey, ctx));
        }
        else if (map instanceof Set) {
            map.add(jsKey);
        }
        else {
            const stringKey = stringifyKey(key, jsKey, ctx);
            const jsValue = toJS(value, stringKey, ctx);
            if (stringKey in map)
                Object.defineProperty(map, stringKey, {
                    value: jsValue,
                    writable: true,
                    enumerable: true,
                    configurable: true
                });
            else
                map[stringKey] = jsValue;
        }
    }
    return map;
}
const isMergeKey = (key) => key === MERGE_KEY ||
    (isScalar(key) &&
        key.value === MERGE_KEY &&
        (!key.type || key.type === Scalar.PLAIN));
// If the value associated with a merge key is a single mapping node, each of
// its key/value pairs is inserted into the current mapping, unless the key
// already exists in it. If the value associated with the merge key is a
// sequence, then this sequence is expected to contain mapping nodes and each
// of these nodes is merged in turn according to its order in the sequence.
// Keys in mapping nodes earlier in the sequence override keys specified in
// later mapping nodes. -- http://yaml.org/type/merge.html
function mergeToJSMap(ctx, map, value) {
    const source = ctx && isAlias(value) ? value.resolve(ctx.doc) : value;
    if (!isMap(source))
        throw new Error('Merge sources must be maps or map aliases');
    const srcMap = source.toJSON(null, ctx, Map);
    for (const [key, value] of srcMap) {
        if (map instanceof Map) {
            if (!map.has(key))
                map.set(key, value);
        }
        else if (map instanceof Set) {
            map.add(key);
        }
        else if (!Object.prototype.hasOwnProperty.call(map, key)) {
            Object.defineProperty(map, key, {
                value,
                writable: true,
                enumerable: true,
                configurable: true
            });
        }
    }
    return map;
}
function stringifyKey(key, jsKey, ctx) {
    if (jsKey === null)
        return '';
    if (typeof jsKey !== 'object')
        return String(jsKey);
    if (isNode(key) && ctx && ctx.doc) {
        const strCtx = createStringifyContext(ctx.doc, {});
        strCtx.anchors = new Set();
        for (const node of ctx.anchors.keys())
            strCtx.anchors.add(node.anchor);
        strCtx.inFlow = true;
        strCtx.inStringifyKey = true;
        const strKey = key.toString(strCtx);
        if (!ctx.mapKeyWarned) {
            let jsonStr = JSON.stringify(strKey);
            if (jsonStr.length > 40)
                jsonStr = jsonStr.substring(0, 36) + '..."';
            warn(ctx.doc.options.logLevel, `Keys with collection values will be stringified due to JS Object restrictions: ${jsonStr}. Set mapAsMap: true to use object keys.`);
            ctx.mapKeyWarned = true;
        }
        return strKey;
    }
    return JSON.stringify(jsKey);
}

export { addPairToJSMap };