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