Created
March 10, 2015 14:57
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Minimalistic JSON Pointer (RFC 6901) implementation. Does not support URI Fragments, but otherwise compliant
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| 'use strict'; | |
| exports.get = function(document, pointer) { | |
| //Empty pointer references the whole document | |
| if(pointer === '') return document; | |
| //Split the pointer into reference tokens and unescape | |
| var referenceTokens = pointer.slice(1).split('/').map(unescape); | |
| //Decent down the object iteratively | |
| return referenceTokens.reduce(function(object, token) { | |
| //Strip leading zeros from array indicies | |
| if(Array.isArray(object)) token = parseInt(token); | |
| //Throw an error on undefined values. | |
| //In the case of '-' for an array index, this will be `NaN` due to the last | |
| //line and should index an undefined value | |
| if(object[token] === undefined) throw Error('Pointer is referencing non-existing value'); | |
| return object[token]; | |
| }, document); | |
| }; | |
| function unescape(token) { | |
| //Unescape as per Section 4, paragraph 2 | |
| return token.replace('~1', '/').replace('~0', '~'); | |
| } | |
| exports = exports.get; |
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| 'use strict'; | |
| var test = require('tape'); | |
| var jsonPointer = require('../../../lib/json-pointer'); | |
| test('example', function(t) { | |
| var json = { | |
| foo: ['bar', 'baz'], | |
| '': 0, | |
| 'a/b': 1, | |
| 'c%d': 2, | |
| 'e^f': 3, | |
| 'g|h': 4, | |
| 'i\\j': 5, | |
| "k\"l": 6, // eslint-disable-line quotes | |
| ' ': 7, | |
| 'm~n': 8 | |
| }; | |
| var find = jsonPointer.get.bind(null, json); | |
| t.same(find(''), json, 'allow empty pointer (return complete document)'); | |
| t.same(find('/foo'), ['bar', 'baz'], 'return the exact array'); | |
| t.is(find('/foo/0'), 'bar', 'return array at index'); | |
| t.is(find('/foo/01'), 'baz', 'strip leading zeros from indicies'); | |
| t.throws(find.bind(null, '/foo/-'), Error, 'throw on the special "array end" operator'); | |
| t.throws(find.bind(null, '/qux'), Error, 'throw on non-existing keys'); | |
| t.is(find('/'), 0, 'allow pointer to empty name'); | |
| t.is(find('/a~1b'), 1, 'escaped /'); | |
| t.is(find('/c%d'), 2, 'special char %'); | |
| t.is(find('/e^f'), 3, 'special char ^'); | |
| t.is(find('/g|h'), 4, 'special char |'); | |
| t.is(find('/i\\j'), 5, 'special char \\'); | |
| t.is(find("/k\"l"), 6, 'special char "'); // eslint-disable-line quotes | |
| t.is(find('/ '), 7, 'special char ⎵ (space)'); | |
| t.is(find('/m~0n'), 8, 'escaped ~'); | |
| t.end(); | |
| }); |
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