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371 lines
9.3 KiB
371 lines
9.3 KiB
/**
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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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* Default configs.
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*/
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var DEFAULT_DELIMITER = '/'
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var DEFAULT_DELIMITERS = './'
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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, "?"]
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// "/route(\\d+)" => [undefined, undefined, undefined, "\d+", 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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* @param {Object=} options
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* @return {!Array}
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*/
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function parse (str, options) {
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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 defaultDelimiter = (options && options.delimiter) || DEFAULT_DELIMITER
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var delimiters = (options && options.delimiters) || DEFAULT_DELIMITERS
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var pathEscaped = false
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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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pathEscaped = true
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continue
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}
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var prev = ''
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var next = str[index]
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var name = res[2]
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var capture = res[3]
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var group = res[4]
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var modifier = res[5]
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if (!pathEscaped && path.length) {
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var k = path.length - 1
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if (delimiters.indexOf(path[k]) > -1) {
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prev = path[k]
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path = path.slice(0, k)
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}
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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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pathEscaped = false
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}
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var partial = prev !== '' && next !== undefined && next !== prev
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var repeat = modifier === '+' || modifier === '*'
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var optional = modifier === '?' || modifier === '*'
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var delimiter = prev || defaultDelimiter
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var pattern = capture || group
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tokens.push({
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name: name || key++,
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prefix: prev,
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delimiter: delimiter,
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optional: optional,
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repeat: repeat,
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partial: partial,
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pattern: pattern ? escapeGroup(pattern) : '[^' + escapeString(delimiter) + ']+?'
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})
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}
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// Push any remaining characters.
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if (path || index < str.length) {
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tokens.push(path + str.substr(index))
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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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* @param {Object=} options
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* @return {!function(Object=, Object=)}
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*/
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function compile (str, options) {
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return tokensToFunction(parse(str, options))
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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 (data, options) {
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var path = ''
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var encode = (options && options.encode) || encodeURIComponent
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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 ? data[token.name] : undefined
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var segment
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if (Array.isArray(value)) {
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if (!token.repeat) {
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throw new TypeError('Expected "' + token.name + '" to not repeat, but got array')
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}
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if (value.length === 0) {
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if (token.optional) continue
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throw new TypeError('Expected "' + token.name + '" to not be empty')
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}
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for (var j = 0; j < value.length; j++) {
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segment = encode(value[j], token)
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if (!matches[i].test(segment)) {
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throw new TypeError('Expected all "' + token.name + '" to match "' + token.pattern + '"')
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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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if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean') {
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segment = encode(String(value), token)
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if (!matches[i].test(segment)) {
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throw new TypeError('Expected "' + token.name + '" to match "' + token.pattern + '", but got "' + segment + '"')
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}
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path += token.prefix + segment
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continue
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}
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if (token.optional) {
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// Prepend partial segment prefixes.
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if (token.partial) path += token.prefix
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continue
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}
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throw new TypeError('Expected "' + token.name + '" to be ' + (token.repeat ? 'an array' : 'a string'))
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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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* 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 && 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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if (!keys) return path
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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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partial: false,
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pattern: null
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})
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}
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}
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return path
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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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return new RegExp('(?:' + parts.join('|') + ')', flags(options))
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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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return tokensToRegExp(parse(path, options), keys, options)
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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, keys, 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 delimiter = escapeString(options.delimiter || DEFAULT_DELIMITER)
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var delimiters = options.delimiters || DEFAULT_DELIMITERS
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var endsWith = [].concat(options.endsWith || []).map(escapeString).concat('$').join('|')
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var route = ''
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var isEndDelimited = tokens.length === 0
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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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isEndDelimited = i === tokens.length - 1 && delimiters.indexOf(token[token.length - 1]) > -1
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} else {
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var prefix = escapeString(token.prefix)
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var capture = token.repeat
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? '(?:' + token.pattern + ')(?:' + prefix + '(?:' + token.pattern + '))*'
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: token.pattern
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if (keys) keys.push(token)
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if (token.optional) {
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if (token.partial) {
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route += prefix + '(' + capture + ')?'
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} else {
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route += '(?:' + prefix + '(' + capture + '))?'
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}
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} else {
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route += prefix + '(' + capture + ')'
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}
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}
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}
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if (end) {
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if (!strict) route += '(?:' + delimiter + ')?'
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route += endsWith === '$' ? '$' : '(?=' + endsWith + ')'
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} else {
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if (!strict) route += '(?:' + delimiter + '(?=' + endsWith + '))?'
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if (!isEndDelimited) route += '(?=' + delimiter + '|' + endsWith + ')'
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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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if (path instanceof RegExp) {
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return regexpToRegexp(path, keys)
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}
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if (Array.isArray(path)) {
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return arrayToRegexp(/** @type {!Array} */ (path), keys, options)
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}
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return stringToRegexp(/** @type {string} */ (path), keys, options)
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}
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