json-schema-describes-subset/dist/utils/traverse-json-schema/traverse-json-schema.js

Tools for static JSON schema analysis, including functions to determine if one schema describes a subset of another or if a schema describes the empty set or to convert a schema to its disjunctive normal form (DNF).

import isObject from 'lodash/isObject.js';
import includes from 'lodash/includes.js';
import { isJSONSchema } from '../../json-schema/index.js';
const arrayKeywords = ['prefixItems', 'allOf', 'anyOf', 'oneOf'];
const objectKeywords = [
    '$defs',
    'definitions',
    'properties',
    'patternProperties',
    'dependencies',
];
const schemaKeywords = [
    'additionalItems',
    'items',
    'contains',
    'additionalProperties',
    'propertyNames',
    'not',
    'if',
    'then',
    'else',
    'unevaluatedProperties',
    'unevaluatedItems',
];
export function traverseJSONSchema(schema, callback, data, args) {
    if (!isObject(schema) || Array.isArray(schema)) {
        return;
    }
    const newData = callback(schema, data, { parent: args?.parent || null });
    for (const [key, value] of Object.entries(schema)) {
        if (includes(arrayKeywords, key)) {
            if (Array.isArray(value)) {
                value.forEach((subSchema) => {
                    if (isJSONSchema(subSchema)) {
                        traverseJSONSchema(subSchema, callback, newData, {
                            parent: schema,
                        });
                    }
                });
            }
        }
        else if (includes(objectKeywords, key)) {
            if (isObject(value) && !Array.isArray(value))
                Object.values(value).forEach((subSchema) => {
                    if (isJSONSchema(subSchema)) {
                        traverseJSONSchema(subSchema, callback, newData, {
                            parent: schema,
                        });
                    }
                });
        }
        else if (includes(schemaKeywords, key) && isJSONSchema(value)) {
            traverseJSONSchema(value, callback, newData, {
                parent: schema,
            });
        }
    }
}
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