97 lines
2.3 KiB
JavaScript
97 lines
2.3 KiB
JavaScript
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var hasExcape = /~/
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var escapeMatcher = /~[01]/g
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function escapeReplacer (m) {
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switch (m) {
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case '~1': return '/'
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case '~0': return '~'
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}
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throw new Error('Invalid tilde escape: ' + m)
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}
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function untilde (str) {
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if (!hasExcape.test(str)) return str
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return str.replace(escapeMatcher, escapeReplacer)
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}
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function setter (obj, pointer, value) {
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var part
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var hasNextPart
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if (pointer[1] === 'constructor' && pointer[2] === 'prototype') return obj
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if (pointer[1] === '__proto__') return obj
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for (var p = 1, len = pointer.length; p < len;) {
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part = untilde(pointer[p++])
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hasNextPart = len > p
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if (typeof obj[part] === 'undefined') {
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// support setting of /-
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if (Array.isArray(obj) && part === '-') {
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part = obj.length
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}
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// support nested objects/array when setting values
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if (hasNextPart) {
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if ((pointer[p] !== '' && pointer[p] < Infinity) || pointer[p] === '-') obj[part] = []
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else obj[part] = {}
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}
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}
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if (!hasNextPart) break
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obj = obj[part]
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}
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var oldValue = obj[part]
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if (value === undefined) delete obj[part]
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else obj[part] = value
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return oldValue
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}
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function compilePointer (pointer) {
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if (typeof pointer === 'string') {
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pointer = pointer.split('/')
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if (pointer[0] === '') return pointer
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throw new Error('Invalid JSON pointer.')
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} else if (Array.isArray(pointer)) {
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return pointer
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}
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throw new Error('Invalid JSON pointer.')
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}
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function get (obj, pointer) {
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if (typeof obj !== 'object') throw new Error('Invalid input object.')
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pointer = compilePointer(pointer)
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var len = pointer.length
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if (len === 1) return obj
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for (var p = 1; p < len;) {
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obj = obj[untilde(pointer[p++])]
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if (len === p) return obj
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if (typeof obj !== 'object') return undefined
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}
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}
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function set (obj, pointer, value) {
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if (typeof obj !== 'object') throw new Error('Invalid input object.')
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pointer = compilePointer(pointer)
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if (pointer.length === 0) throw new Error('Invalid JSON pointer for set.')
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return setter(obj, pointer, value)
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}
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function compile (pointer) {
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var compiled = compilePointer(pointer)
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return {
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get: function (object) {
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return get(object, compiled)
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},
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set: function (object, value) {
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return set(object, compiled, value)
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}
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}
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}
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exports.get = get
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exports.set = set
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exports.compile = compile
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