/* @flow */
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import { warn } from './warn'
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const encodeReserveRE = /[!'()*]/g
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const encodeReserveReplacer = c => '%' + c.charCodeAt(0).toString(16)
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const commaRE = /%2C/g
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// fixed encodeURIComponent which is more conformant to RFC3986:
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// - escapes [!'()*]
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// - preserve commas
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const encode = str =>
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encodeURIComponent(str)
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.replace(encodeReserveRE, encodeReserveReplacer)
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.replace(commaRE, ',')
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export function decode (str: string) {
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try {
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return decodeURIComponent(str)
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} catch (err) {
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if (process.env.NODE_ENV !== 'production') {
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warn(false, `Error decoding "${str}". Leaving it intact.`)
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}
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}
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return str
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}
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export function resolveQuery (
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query: ?string,
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extraQuery: Dictionary<string> = {},
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_parseQuery: ?Function
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): Dictionary<string> {
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const parse = _parseQuery || parseQuery
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let parsedQuery
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try {
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parsedQuery = parse(query || '')
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} catch (e) {
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process.env.NODE_ENV !== 'production' && warn(false, e.message)
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parsedQuery = {}
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}
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for (const key in extraQuery) {
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const value = extraQuery[key]
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parsedQuery[key] = Array.isArray(value)
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? value.map(castQueryParamValue)
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: castQueryParamValue(value)
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}
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return parsedQuery
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}
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const castQueryParamValue = value => (value == null || typeof value === 'object' ? value : String(value))
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function parseQuery (query: string): Dictionary<string> {
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const res = {}
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query = query.trim().replace(/^(\?|#|&)/, '')
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if (!query) {
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return res
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}
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query.split('&').forEach(param => {
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const parts = param.replace(/\+/g, ' ').split('=')
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const key = decode(parts.shift())
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const val = parts.length > 0 ? decode(parts.join('=')) : null
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if (res[key] === undefined) {
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res[key] = val
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} else if (Array.isArray(res[key])) {
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res[key].push(val)
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} else {
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res[key] = [res[key], val]
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}
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})
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return res
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}
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export function stringifyQuery (obj: Dictionary<string>): string {
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const res = obj
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? Object.keys(obj)
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.map(key => {
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const val = obj[key]
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if (val === undefined) {
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return ''
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}
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if (val === null) {
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return encode(key)
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}
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if (Array.isArray(val)) {
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const result = []
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val.forEach(val2 => {
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if (val2 === undefined) {
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return
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}
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if (val2 === null) {
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result.push(encode(key))
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} else {
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result.push(encode(key) + '=' + encode(val2))
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}
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})
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return result.join('&')
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}
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return encode(key) + '=' + encode(val)
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})
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.filter(x => x.length > 0)
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.join('&')
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: null
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return res ? `?${res}` : ''
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}
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