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* © Copyright 2022 HP Development Company, L.P.
* SPDX-License-Identifier: MIT
*/
// code heavily inspired by: https://github.com/epoberezkin/json-schema-traverse
import { isPlainObject } from '../../lib/object-utils';
interface SchemaObject {
$id?: string;
$schema?: string;
[key: string]: any;
}
export interface CallbackArgs {
schema: SchemaObject;
jsonPtr: string;
rootSchema: SchemaObject;
parentJsonPtr?: string;
parentKeyword?: string;
parentSchema?: SchemaObject;
keyIndex?: string | number;
}
export type Callback = (args: CallbackArgs) => void;
export interface Options {
allKeys?: boolean;
}
export class JSONSchemaTraverser {
static KEYWORDS = {
additionalItems: true,
items: true,
contains: true,
additionalProperties: true,
propertyNames: true,
not: true,
if: true,
then: true,
else: true
};
static ARRAY_KEYWORDS = {
items: true,
allOf: true,
anyOf: true,
oneOf: true
};
static PROPS_KEYWORDS = {
$defs: true,
definitions: true,
properties: true,
patternProperties: true,
dependencies: true
};
static SKIP_KEYWORDS = {
default: true,
enum: true,
const: true,
required: true,
maximum: true,
minimum: true,
exclusiveMaximum: true,
exclusiveMinimum: true,
multipleOf: true,
maxLength: true,
minLength: true,
pattern: true,
format: true,
maxItems: true,
minItems: true,
uniqueItems: true,
maxProperties: true,
minProperties: true
};
public static traverse(schema: SchemaObject, cb: Callback, opts: Options = {}) {
this.recursiveTraverse(opts, cb, schema, '', schema);
}
private static recursiveTraverse(
opts: Options,
cb: Callback,
schema: SchemaObject,
jsonPtr: string,
rootSchema: SchemaObject,
parentJsonPtr?: string,
parentKeyword?: string,
parentSchema?: SchemaObject,
keyIndex?: number | string
) {
Eif (schema && !Array.isArray(schema)) {
cb({ schema, jsonPtr, rootSchema, parentJsonPtr, parentKeyword, parentSchema, keyIndex });
if (!isPlainObject(schema)) {
return;
}
Object.keys(schema).forEach(key => {
const sch = schema[key];
if (Array.isArray(sch)) {
if (key in this.ARRAY_KEYWORDS) {
sch.forEach((_v, i) =>
this.recursiveTraverse(
opts,
cb,
sch[i],
`${jsonPtr}/${key}/${i}`,
rootSchema,
jsonPtr,
key,
schema,
i
)
);
return;
}
}
if (key in this.PROPS_KEYWORDS) {
Eif (sch && typeof sch === 'object') {
Object.keys(sch).forEach(prop =>
this.recursiveTraverse(
opts,
cb,
sch[prop],
`${jsonPtr}/${key}/${this.escapeJsonPtr(prop)}`,
rootSchema,
jsonPtr,
key,
schema,
prop
)
);
return;
}
}
if (key in this.KEYWORDS || (opts?.allKeys && !(key in this.SKIP_KEYWORDS))) {
this.recursiveTraverse(opts, cb, sch, `${jsonPtr}/${key}`, rootSchema, jsonPtr, key, schema);
}
});
}
}
private static escapeJsonPtr(str: string): string {
return str.replace(/~/g, '~0').replace(/\//g, '~1');
}
}
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