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@swagger-api/apidom-json-pointer

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  • License Apache-2.0

Evaluate JSON Pointer expressions against ApiDOM.

Package Exports

  • @swagger-api/apidom-json-pointer
  • @swagger-api/apidom-json-pointer/legacy
  • @swagger-api/apidom-json-pointer/modern

Readme

@swagger-api/apidom-json-pointer

apidom-json-pointer is a package that evaluates JSON Pointer against ApiDOM.

Installation

You can install this package via npm CLI by running the following command:

 $ npm install @swagger-api/apidom-json-pointer

Modern API

This is the recommended API for use in new projects. It is fully compliant with RFC 6901 and supports all aspects of JSON Pointer. Uses @swaggerexpert/json-pointer under the hood and fully reflects its API. For additional options and details, refer to the @swaggerexpert/json-pointer documentation.

Evaluation is contextual to ApiDOM realm - meaning evaluate function expects only ApiDOM as the first argument.

import { evaluate } from '@swagger-api/apidom-json-pointer/modern';

Evaluating

import { ObjectElement } from '@swagger-api/apidom-core';
import { evaluate } from '@swagger-api/apidom-json-pointer/modern';

const apidom = new ObjectElement({ a: { b: 'c' } });
const result =  evaluate(apidom, '/a/b');
// => StringElement('c')

Parsing

Parses JSON Pointer into a list of tokens, which can be accessed through the tree property of the parse result.

import { parse } from '@swagger-api/apidom-json-pointer/modern';

const parseResult = parse('/a/b');
// =>
// {
//   result: {
//     success: true,
//     state: 101,
//     stateName: 'MATCH',
//     length: 4,
//     matched: 4,
//     maxMatched: 4,
//     maxTreeDepth: 8,
//     nodeHits: 31
//   },
//   tree: [ 'a', 'b' ],
//   stats: undefined,
//   trace: undefined
// }

Compiling

Compiles a list of tokens into JSON Pointer.

import { compile } from '@swagger-api/apidom-json-pointer/modern';

const jsonPointer = compile(['a', 'b']); // => '/a/b'

Escaping

Escapes/unescapes tokens of JSON Pointer.

import { escape, unescape } from '@swagger-api/apidom-json-pointer/modern';

escape('~a/'); // => '~0a~1'
unescape('~0a~1'); // => '~a/'

Transforming URI to JSON Pointer

Handles case of URI Fragment Identifier Representation.

import { URIFragmentIdentifier } from '@swagger-api/apidom-json-pointer/modern';

URIFragmentIdentifier.fromURIReference('https://example.com/path/#/a/b'); // => '/a/b'

Validating

Validates a JSON Pointer and its tokens.

import {
  testJSONPointer,
  testReferenceToken,
  testArrayLocation,
  testArrayIndex,
  testArrayDash,
} from '@swagger-api/apidom-json-pointer/modern';

testJSONPointer('/a/b'); // => true
testReferenceToken('a'); // => true
testArrayLocation('0'); // => true
testArrayLocation('-'); // => true
testArrayIndex('0'); // => true
testArrayDash('-'); // => true

Invalid JSON Pointers

JSONPointerError is the base class for all JSON Pointer errors.

import { JSONPointerError } from '@swagger-api/apidom-json-pointer/modern';

If an invalid list of tokens is supplied to compile function, JSONPointerCompileError is thrown.

import { JSONPointerCompileError } from '@swagger-api/apidom-json-pointer/modern';

If an invalid JSON Pointer is supplied to evaluate function, JSONPointerEvaluateError is thrown.

import { JSONPointerEvaluateError } from '@swagger-api/apidom-json-pointer/modern';

If a valid JSON Pointer is supplied to evaluate function and the pointer cannot be evaluated against ApiDOM fragment because it is not an object or an array, JSONPointerTypeError is thrown.

import { JSONPointerTypeError } from '@swagger-api/apidom-json-pointer/modern';

If a valid JSON Pointer is supplied to evaluate function and the pointer cannot be evaluated against ApiDOM fragment because the key does not exist in the object, JSONPointerKeyError is thrown.

import { JSONPointerKeyError } from '@swagger-api/apidom-json-pointer/modern';

If a valid JSON Pointer is supplied to evaluate function and the pointer cannot be evaluated against ApiDOM fragment because the index does not exist in the array, JSONPointerIndexError is thrown. 

import { JSONPointerIndexError } from '@swagger-api/apidom-json-pointer/modern';

If an error occurs in parse function, JSONPointerParseError is thrown.

import { JSONPointerParseError } from '@swagger-api/apidom-json-pointer/modern';

Legacy API

This is a legacy API not recommended for use in new projects. It is provided for backward compatibility only. The legacy API implementation is not RFC 6901 compliant, nor does it support all features of JSON Pointer.

Importing legacy API from @swagger-api/apidom-json-pointer is equivalent to importing from @swagger-api/apidom-json-pointer/legacy.

import { evaluate } from '@swagger-api/apidom-json-pointer';

or

import { evaluate } from '@swagger-api/apidom-json-pointer/legacy';

Evaluating

import { ObjectElement } from '@swagger-api/apidom-core';
import { evaluate } from '@swagger-api/apidom-json-pointer';

const apidom = new ObjectElement({ a: { b: 'c' } });
const result =  evaluate('/a/b', apidom);
// => StringElement('c')

Parsing

Parses JSON Pointer into a list of tokens.

import { parse } from '@swagger-api/apidom-json-pointer';

const tokens = parse('/a/b'); // => ['a', 'b']

Compiling

Compiles a list of tokens into JSON Pointer.

import { compile } from '@swagger-api/apidom-json-pointer';

const jsonPointer = compile(['a', 'b']); // => '/a/b'

Escaping

Escapes/unescapes tokens of JSON Pointer.

import { escape, unescape } from '@swagger-api/apidom-json-pointer';

escape('~a/'); // => '~0a~1'
unescape('~0a~1'); // => '~a/'

Transforming URI to JSON Pointer

Handles case of URI Fragment Identifier Representation.

import { uriToPointer } from '@swagger-api/apidom-json-pointer';

uriToPointer('https://example.com/path/#/a/b'); // => '/a/b'

Invalid JSON Pointers

If an invalid JSON Pointer is supplied to parse or evaluate functions, InvalidJsonPointerError is thrown.

import { InvalidJsonPointerError } from '@swagger-api/apidom-json-pointer';

If a valid JSON Pointer is supplied to evaluate function and the pointer cannot be evaluated against ApiDOM fragment, EvaluationJsonPointerError is thrown.

import { EvaluationJsonPointerError } from '@swagger-api/apidom-json-pointer';