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index.js
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index.js
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/**
* Based on Kendo UI Core expression code <https://github.com/telerik/kendo-ui-core#license-information>
*/
'use strict'
function Cache(maxSize) {
this._maxSize = maxSize
this.clear()
}
Cache.prototype.clear = function () {
this._size = 0
this._values = Object.create(null)
}
Cache.prototype.get = function (key) {
return this._values[key]
}
Cache.prototype.set = function (key, value) {
this._size >= this._maxSize && this.clear()
if (!(key in this._values)) this._size++
return (this._values[key] = value)
}
var SPLIT_REGEX = /[^.^\]^[]+|(?=\[\]|\.\.)/g,
DIGIT_REGEX = /^\d+$/,
LEAD_DIGIT_REGEX = /^\d/,
SPEC_CHAR_REGEX = /[~`!#$%\^&*+=\-\[\]\\';,/{}|\\":<>\?]/g,
CLEAN_QUOTES_REGEX = /^\s*(['"]?)(.*?)(\1)\s*$/,
MAX_CACHE_SIZE = 512
var pathCache = new Cache(MAX_CACHE_SIZE),
setCache = new Cache(MAX_CACHE_SIZE),
getCache = new Cache(MAX_CACHE_SIZE)
var config
module.exports = {
Cache: Cache,
split: split,
normalizePath: normalizePath,
setter: function (path) {
var parts = normalizePath(path)
return (
setCache.get(path) ||
setCache.set(path, function setter(obj, value) {
var index = 0
var len = parts.length
var data = obj
while (index < len - 1) {
var part = parts[index]
if (
part === '__proto__' ||
part === 'constructor' ||
part === 'prototype'
) {
return obj
}
data = data[parts[index++]]
}
data[parts[index]] = value
})
)
},
getter: function (path, safe) {
var parts = normalizePath(path)
return (
getCache.get(path) ||
getCache.set(path, function getter(data) {
var index = 0,
len = parts.length
while (index < len) {
if (data != null || !safe) data = data[parts[index++]]
else return
}
return data
})
)
},
join: function (segments) {
return segments.reduce(function (path, part) {
return (
path +
(isQuoted(part) || DIGIT_REGEX.test(part)
? '[' + part + ']'
: (path ? '.' : '') + part)
)
}, '')
},
forEach: function (path, cb, thisArg) {
forEach(Array.isArray(path) ? path : split(path), cb, thisArg)
},
}
function normalizePath(path) {
return (
pathCache.get(path) ||
pathCache.set(
path,
split(path).map(function (part) {
return part.replace(CLEAN_QUOTES_REGEX, '$2')
})
)
)
}
function split(path) {
return path.match(SPLIT_REGEX) || ['']
}
function forEach(parts, iter, thisArg) {
var len = parts.length,
part,
idx,
isArray,
isBracket
for (idx = 0; idx < len; idx++) {
part = parts[idx]
if (part) {
if (shouldBeQuoted(part)) {
part = '"' + part + '"'
}
isBracket = isQuoted(part)
isArray = !isBracket && /^\d+$/.test(part)
iter.call(thisArg, part, isBracket, isArray, idx, parts)
}
}
}
function isQuoted(str) {
return (
typeof str === 'string' && str && ["'", '"'].indexOf(str.charAt(0)) !== -1
)
}
function hasLeadingNumber(part) {
return part.match(LEAD_DIGIT_REGEX) && !part.match(DIGIT_REGEX)
}
function hasSpecialChars(part) {
return SPEC_CHAR_REGEX.test(part)
}
function shouldBeQuoted(part) {
return !isQuoted(part) && (hasLeadingNumber(part) || hasSpecialChars(part))
}