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