@finnair/path-parser
npm i @finnair/path-parser

@finnair/path-parser

V stands for Validation

by finnair

0.9.0 (see all)License:MITTypeScript:Not Found
npm i @finnair/path-parser
Readme

Path Parser

@finnair/path-parser contains nearley.js based parsers for Path and PathMatcher.

See @finnair/path or instructions on how to use Path and PathMatcher.

Getting Started

Install v-validation using yarn:

yarn add @finnair/path-parser

Or npm:

npm install @finnair/path-parser

Parsing Paths

import { parsePath } from '@finnair/path-parser';

parsePath(`$.array[1]["\\"property\\" with spaces and 'quotes'"]`); // JSON string encoded in brackets!
// Path.of('array', 1, `"property" with spaces and 'quotes'`);

// Single quotes also work, but encoding is still JSON string so the value cannot contain ' character
parsePath(`$['single quotes']`); // Path.of('single quotes')
parsePath(`$['single\'quote']`); // Fail!

// ...without using unicode escape
parsePath(`$['\\u0027']`); // Path.of("'");

Parsing PathMatchers

parsePathMatcher parses simple JsonPath like expressions. Supported expressions are

ExpressionDescription 
$.propertyIdentifiers matching RegExp /^[a-zA-Z_][a-zA-Z0-9_]*$/
$[0]Index match
$.*Any property matcher, wildcard (matches also array indexes)
$[*]Any index matcher, wildcard (matches only array indexes)
$["JSON string encoded property"]Property as JSON encoded string
$['JSON string encoded property']Property as single quoted, but otherwise JSON encoded, string(*)
$[union,"of",4,'components']Union matcher that also supports identifiers and JSON encoded strings

*) This is the official way of JsonPath, but the specification is a bit unclear on the encoding. In this library we prefer proper JSON string encoding with double quotes.

import { parsePathMatcher } from '@finnair/path-parser';

parsePathMatcher(`$.array[0][*].*['union',"of",properties,1]`);
// PathMatcher.of(
//   'array',
//    0,
//   AnyIndex,
//   AnyProperty,
//   UnionMatcher.of('union', 'of', 'properties', 1)
// )

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LAST COMMIT

5mos ago

MAINTAINERS

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CONTRIBUTORS

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OPEN ISSUES

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OPEN PRs

1
VersionTagPublished
0.9.0
latest
2yrs ago
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