const URL_REGEXP = /^https?:\/\/[a-zA-Z0-9\-\.:]+(\/?[^?#]*)/ export type Pattern = readonly [string, string, RegExp | true] | '*' export const splitPath = (path: string): string[] => { const paths = path.split(/\//) // faster than path.split('/') if (paths[0] === '') { paths.shift() } return paths } const patternCache: { [key: string]: Pattern } = {} export const getPattern = (label: string): Pattern | null => { // * => wildcard // :id{[0-9]+} => ([0-9]+) // :id => (.+) //const name = '' if (label === '*') { return '*' } const match = label.match(/^\:([^\{\}]+)(?:\{(.+)\})?$/) if (match) { if (!patternCache[label]) { if (match[2]) { patternCache[label] = [label, match[1], new RegExp('^' + match[2] + '$')] } else { patternCache[label] = [label, match[1], true] } } return patternCache[label] } return null } export const getPathFromURL = (url: string, strict: boolean = true): string => { const queryIndex = url.indexOf('?') const result = url.substring(url.indexOf('/', 8), queryIndex === -1 ? url.length : queryIndex) // if strict routing is false => `/hello/hey/` and `/hello/hey` are treated the same // default is true if (strict === false && result.endsWith('/')) { return result.slice(0, -1) } return result } export const getQueryStringFromURL = (url: string): string => { const queryIndex = url.indexOf('?') const result = queryIndex !== -1 ? url.substring(queryIndex) : '' return result } export const isAbsoluteURL = (url: string): boolean => { const match = url.match(URL_REGEXP) if (match) { return true } return false } export const mergePath = (...paths: string[]): string => { let p: string = '' let endsWithSlash = false for (let path of paths) { /* ['/hey/','/say'] => ['/hey', '/say'] */ if (p.endsWith('/')) { p = p.slice(0, -1) endsWithSlash = true } /* ['/hey','say'] => ['/hey', '/say'] */ if (!path.startsWith('/')) { path = `/${path}` } /* ['/hey/', '/'] => `/hey/` */ if (path === '/' && endsWithSlash) { p = `${p}/` } else if (path !== '/') { p = `${p}${path}` } /* ['/', '/'] => `/` */ if (path === '/' && p === '') { p = '/' } } return p }