111 lines
2.6 KiB
JavaScript
111 lines
2.6 KiB
JavaScript
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var isBuffer = require('is-buffer')
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module.exports = flatten
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flatten.flatten = flatten
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flatten.unflatten = unflatten
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function flatten (target, opts) {
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opts = opts || {}
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var delimiter = opts.delimiter || '.'
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var maxDepth = opts.maxDepth
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var output = {}
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function step (object, prev, currentDepth) {
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currentDepth = currentDepth || 1
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Object.keys(object).forEach(function (key) {
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var value = object[key]
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var isarray = opts.safe && Array.isArray(value)
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var type = Object.prototype.toString.call(value)
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var isbuffer = isBuffer(value)
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var isobject = (
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type === '[object Object]' ||
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type === '[object Array]'
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)
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var newKey = prev
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? prev + delimiter + key
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: key
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if (!isarray && !isbuffer && isobject && Object.keys(value).length &&
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(!opts.maxDepth || currentDepth < maxDepth)) {
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return step(value, newKey, currentDepth + 1)
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}
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output[newKey] = value
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})
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}
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step(target)
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return output
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}
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function unflatten (target, opts) {
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opts = opts || {}
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var delimiter = opts.delimiter || '.'
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var overwrite = opts.overwrite || false
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var result = {}
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var isbuffer = isBuffer(target)
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if (isbuffer || Object.prototype.toString.call(target) !== '[object Object]') {
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return target
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}
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// safely ensure that the key is
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// an integer.
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function getkey (key) {
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var parsedKey = Number(key)
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return (
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isNaN(parsedKey) ||
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key.indexOf('.') !== -1 ||
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opts.object
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) ? key
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: parsedKey
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}
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var sortedKeys = Object.keys(target).sort(function (keyA, keyB) {
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return keyA.length - keyB.length
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})
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sortedKeys.forEach(function (key) {
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var split = key.split(delimiter)
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var key1 = getkey(split.shift())
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var key2 = getkey(split[0])
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var recipient = result
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while (key2 !== undefined) {
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var type = Object.prototype.toString.call(recipient[key1])
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var isobject = (
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type === '[object Object]' ||
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type === '[object Array]'
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)
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// do not write over falsey, non-undefined values if overwrite is false
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if (!overwrite && !isobject && typeof recipient[key1] !== 'undefined') {
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return
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}
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if ((overwrite && !isobject) || (!overwrite && recipient[key1] == null)) {
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recipient[key1] = (
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typeof key2 === 'number' &&
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!opts.object ? [] : {}
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)
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}
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recipient = recipient[key1]
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if (split.length > 0) {
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key1 = getkey(split.shift())
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key2 = getkey(split[0])
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}
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}
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// unflatten again for 'messy objects'
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recipient[key1] = unflatten(target[key], opts)
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})
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return result
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}
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