391 lines
9.1 KiB
JavaScript
391 lines
9.1 KiB
JavaScript
var isarray = require('isarray')
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/**
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* Expose `pathToRegexp`.
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*/
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module.exports = pathToRegexp
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module.exports.parse = parse
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module.exports.compile = compile
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module.exports.tokensToFunction = tokensToFunction
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module.exports.tokensToRegExp = tokensToRegExp
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/**
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* The main path matching regexp utility.
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*
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* @type {RegExp}
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*/
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var PATH_REGEXP = new RegExp([
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// Match escaped characters that would otherwise appear in future matches.
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// This allows the user to escape special characters that won't transform.
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'(\\\\.)',
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// Match Express-style parameters and un-named parameters with a prefix
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// and optional suffixes. Matches appear as:
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//
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// "/:test(\\d+)?" => ["/", "test", "\d+", undefined, "?", undefined]
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// "/route(\\d+)" => [undefined, undefined, undefined, "\d+", undefined, undefined]
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// "/*" => ["/", undefined, undefined, undefined, undefined, "*"]
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'([\\/.])?(?:(?:\\:(\\w+)(?:\\(((?:\\\\.|[^()])+)\\))?|\\(((?:\\\\.|[^()])+)\\))([+*?])?|(\\*))'
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].join('|'), 'g')
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/**
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* Parse a string for the raw tokens.
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*
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* @param {String} str
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* @return {Array}
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*/
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function parse (str) {
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var tokens = []
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var key = 0
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var index = 0
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var path = ''
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var res
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while ((res = PATH_REGEXP.exec(str)) != null) {
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var m = res[0]
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var escaped = res[1]
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var offset = res.index
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path += str.slice(index, offset)
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index = offset + m.length
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// Ignore already escaped sequences.
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if (escaped) {
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path += escaped[1]
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continue
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}
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// Push the current path onto the tokens.
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if (path) {
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tokens.push(path)
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path = ''
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}
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var prefix = res[2]
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var name = res[3]
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var capture = res[4]
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var group = res[5]
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var suffix = res[6]
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var asterisk = res[7]
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var repeat = suffix === '+' || suffix === '*'
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var optional = suffix === '?' || suffix === '*'
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var delimiter = prefix || '/'
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var pattern = capture || group || (asterisk ? '.*' : '[^' + delimiter + ']+?')
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tokens.push({
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name: name || key++,
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prefix: prefix || '',
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delimiter: delimiter,
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optional: optional,
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repeat: repeat,
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pattern: escapeGroup(pattern)
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})
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}
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// Match any characters still remaining.
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if (index < str.length) {
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path += str.substr(index)
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}
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// If the path exists, push it onto the end.
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if (path) {
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tokens.push(path)
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}
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return tokens
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}
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/**
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* Compile a string to a template function for the path.
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*
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* @param {String} str
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* @return {Function}
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*/
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function compile (str) {
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return tokensToFunction(parse(str))
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}
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/**
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* Expose a method for transforming tokens into the path function.
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*/
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function tokensToFunction (tokens) {
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// Compile all the tokens into regexps.
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var matches = new Array(tokens.length)
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// Compile all the patterns before compilation.
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for (var i = 0; i < tokens.length; i++) {
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if (typeof tokens[i] === 'object') {
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matches[i] = new RegExp('^' + tokens[i].pattern + '$')
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}
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}
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return function (obj) {
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var path = ''
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var data = obj || {}
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for (var i = 0; i < tokens.length; i++) {
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var token = tokens[i]
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if (typeof token === 'string') {
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path += token
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continue
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}
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var value = data[token.name]
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var segment
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if (value == null) {
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if (token.optional) {
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continue
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} else {
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throw new TypeError('Expected "' + token.name + '" to be defined')
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}
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}
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if (isarray(value)) {
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if (!token.repeat) {
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throw new TypeError('Expected "' + token.name + '" to not repeat, but received "' + value + '"')
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}
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if (value.length === 0) {
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if (token.optional) {
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continue
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} else {
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throw new TypeError('Expected "' + token.name + '" to not be empty')
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}
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}
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for (var j = 0; j < value.length; j++) {
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segment = encodeURIComponent(value[j])
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if (!matches[i].test(segment)) {
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throw new TypeError('Expected all "' + token.name + '" to match "' + token.pattern + '", but received "' + segment + '"')
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}
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path += (j === 0 ? token.prefix : token.delimiter) + segment
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}
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continue
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}
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segment = encodeURIComponent(value)
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if (!matches[i].test(segment)) {
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throw new TypeError('Expected "' + token.name + '" to match "' + token.pattern + '", but received "' + segment + '"')
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}
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path += token.prefix + segment
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}
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return path
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}
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}
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/**
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* Escape a regular expression string.
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*
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* @param {String} str
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* @return {String}
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*/
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function escapeString (str) {
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return str.replace(/([.+*?=^!:${}()[\]|\/])/g, '\\$1')
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}
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/**
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* Escape the capturing group by escaping special characters and meaning.
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*
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* @param {String} group
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* @return {String}
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*/
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function escapeGroup (group) {
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return group.replace(/([=!:$\/()])/g, '\\$1')
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}
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/**
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* Attach the keys as a property of the regexp.
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*
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* @param {RegExp} re
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* @param {Array} keys
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* @return {RegExp}
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*/
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function attachKeys (re, keys) {
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re.keys = keys
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return re
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}
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/**
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* Get the flags for a regexp from the options.
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*
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* @param {Object} options
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* @return {String}
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*/
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function flags (options) {
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return options.sensitive ? '' : 'i'
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}
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/**
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* Pull out keys from a regexp.
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*
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* @param {RegExp} path
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* @param {Array} keys
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* @return {RegExp}
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*/
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function regexpToRegexp (path, keys) {
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// Use a negative lookahead to match only capturing groups.
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var groups = path.source.match(/\((?!\?)/g)
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if (groups) {
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for (var i = 0; i < groups.length; i++) {
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keys.push({
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name: i,
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prefix: null,
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delimiter: null,
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optional: false,
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repeat: false,
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pattern: null
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})
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}
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}
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return attachKeys(path, keys)
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}
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/**
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* Transform an array into a regexp.
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*
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* @param {Array} path
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* @param {Array} keys
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* @param {Object} options
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* @return {RegExp}
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*/
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function arrayToRegexp (path, keys, options) {
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var parts = []
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for (var i = 0; i < path.length; i++) {
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parts.push(pathToRegexp(path[i], keys, options).source)
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}
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var regexp = new RegExp('(?:' + parts.join('|') + ')', flags(options))
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return attachKeys(regexp, keys)
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}
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/**
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* Create a path regexp from string input.
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*
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* @param {String} path
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* @param {Array} keys
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* @param {Object} options
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* @return {RegExp}
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*/
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function stringToRegexp (path, keys, options) {
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var tokens = parse(path)
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var re = tokensToRegExp(tokens, options)
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// Attach keys back to the regexp.
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for (var i = 0; i < tokens.length; i++) {
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if (typeof tokens[i] !== 'string') {
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keys.push(tokens[i])
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}
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}
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return attachKeys(re, keys)
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}
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/**
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* Expose a function for taking tokens and returning a RegExp.
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*
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* @param {Array} tokens
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* @param {Array} keys
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* @param {Object} options
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* @return {RegExp}
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*/
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function tokensToRegExp (tokens, options) {
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options = options || {}
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var strict = options.strict
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var end = options.end !== false
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var route = ''
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var lastToken = tokens[tokens.length - 1]
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var endsWithSlash = typeof lastToken === 'string' && /\/$/.test(lastToken)
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// Iterate over the tokens and create our regexp string.
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for (var i = 0; i < tokens.length; i++) {
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var token = tokens[i]
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if (typeof token === 'string') {
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route += escapeString(token)
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} else {
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var prefix = escapeString(token.prefix)
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var capture = token.pattern
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if (token.repeat) {
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capture += '(?:' + prefix + capture + ')*'
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}
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if (token.optional) {
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if (prefix) {
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capture = '(?:' + prefix + '(' + capture + '))?'
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} else {
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capture = '(' + capture + ')?'
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}
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} else {
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capture = prefix + '(' + capture + ')'
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}
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route += capture
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}
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}
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// In non-strict mode we allow a slash at the end of match. If the path to
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// match already ends with a slash, we remove it for consistency. The slash
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// is valid at the end of a path match, not in the middle. This is important
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// in non-ending mode, where "/test/" shouldn't match "/test//route".
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if (!strict) {
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route = (endsWithSlash ? route.slice(0, -2) : route) + '(?:\\/(?=$))?'
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}
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if (end) {
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route += '$'
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} else {
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// In non-ending mode, we need the capturing groups to match as much as
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// possible by using a positive lookahead to the end or next path segment.
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route += strict && endsWithSlash ? '' : '(?=\\/|$)'
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}
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return new RegExp('^' + route, flags(options))
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}
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/**
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* Normalize the given path string, returning a regular expression.
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*
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* An empty array can be passed in for the keys, which will hold the
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* placeholder key descriptions. For example, using `/user/:id`, `keys` will
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* contain `[{ name: 'id', delimiter: '/', optional: false, repeat: false }]`.
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*
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* @param {(String|RegExp|Array)} path
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* @param {Array} [keys]
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* @param {Object} [options]
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* @return {RegExp}
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*/
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function pathToRegexp (path, keys, options) {
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keys = keys || []
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if (!isarray(keys)) {
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options = keys
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keys = []
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} else if (!options) {
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options = {}
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}
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if (path instanceof RegExp) {
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return regexpToRegexp(path, keys, options)
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}
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if (isarray(path)) {
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return arrayToRegexp(path, keys, options)
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}
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return stringToRegexp(path, keys, options)
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}
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