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/**
* Expose `pathToRegexp`.
*/
module.exports = pathToRegexp
module.exports.parse = parse
module.exports.compile = compile
module.exports.tokensToFunction = tokensToFunction
module.exports.tokensToRegExp = tokensToRegExp
/**
* Default configs.
*/
var DEFAULT_DELIMITER = '/'
var DEFAULT_DELIMITERS = './'
/**
* The main path matching regexp utility.
*
* @type {RegExp}
*/
var PATH_REGEXP = new RegExp([
// Match escaped characters that would otherwise appear in future matches.
// This allows the user to escape special characters that won't transform.
'(\\\\.)',
// Match Express-style parameters and un-named parameters with a prefix
// and optional suffixes. Matches appear as:
//
// "/:test(\\d+)?" => ["/", "test", "\d+", undefined, "?"]
// "/route(\\d+)" => [undefined, undefined, undefined, "\d+", undefined]
'(?:\\:(\\w+)(?:\\(((?:\\\\.|[^\\\\()])+)\\))?|\\(((?:\\\\.|[^\\\\()])+)\\))([+*?])?'
].join('|'), 'g')
/**
* Parse a string for the raw tokens.
*
* @param {string} str
* @param {Object=} options
* @return {!Array}
*/
function parse (str, options) {
var tokens = []
var key = 0
var index = 0
var path = ''
var defaultDelimiter = (options && options.delimiter) || DEFAULT_DELIMITER
var delimiters = (options && options.delimiters) || DEFAULT_DELIMITERS
var pathEscaped = false
var res
while ((res = PATH_REGEXP.exec(str)) !== null) {
var m = res[0]
var escaped = res[1]
var offset = res.index
path += str.slice(index, offset)
index = offset + m.length
// Ignore already escaped sequences.
if (escaped) {
path += escaped[1]
pathEscaped = true
continue
}
var prev = ''
var next = str[index]
var name = res[2]
var capture = res[3]
var group = res[4]
var modifier = res[5]
if (!pathEscaped && path.length) {
var k = path.length - 1
if (delimiters.indexOf(path[k]) > -1) {
prev = path[k]
path = path.slice(0, k)
}
}
// Push the current path onto the tokens.
if (path) {
tokens.push(path)
path = ''
pathEscaped = false
}
var partial = prev !== '' && next !== undefined && next !== prev
var repeat = modifier === '+' || modifier === '*'
var optional = modifier === '?' || modifier === '*'
var delimiter = prev || defaultDelimiter
var pattern = capture || group
tokens.push({
name: name || key++,
prefix: prev,
delimiter: delimiter,
optional: optional,
repeat: repeat,
partial: partial,
pattern: pattern ? escapeGroup(pattern) : '[^' + escapeString(delimiter) + ']+?'
})
}
// Push any remaining characters.
if (path || index < str.length) {
tokens.push(path + str.substr(index))
}
return tokens
}
/**
* Compile a string to a template function for the path.
*
* @param {string} str
* @param {Object=} options
* @return {!function(Object=, Object=)}
*/
function compile (str, options) {
return tokensToFunction(parse(str, options))
}
/**
* Expose a method for transforming tokens into the path function.
*/
function tokensToFunction (tokens) {
// Compile all the tokens into regexps.
var matches = new Array(tokens.length)
// Compile all the patterns before compilation.
for (var i = 0; i < tokens.length; i++) {
if (typeof tokens[i] === 'object') {
matches[i] = new RegExp('^(?:' + tokens[i].pattern + ')$')
}
}
return function (data, options) {
var path = ''
var encode = (options && options.encode) || encodeURIComponent
for (var i = 0; i < tokens.length; i++) {
var token = tokens[i]
if (typeof token === 'string') {
path += token
continue
}
var value = data ? data[token.name] : undefined
var segment
if (Array.isArray(value)) {
if (!token.repeat) {
throw new TypeError('Expected "' + token.name + '" to not repeat, but got array')
}
if (value.length === 0) {
if (token.optional) continue
throw new TypeError('Expected "' + token.name + '" to not be empty')
}
for (var j = 0; j < value.length; j++) {
segment = encode(value[j], token)
if (!matches[i].test(segment)) {
throw new TypeError('Expected all "' + token.name + '" to match "' + token.pattern + '"')
}
path += (j === 0 ? token.prefix : token.delimiter) + segment
}
continue
}
if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean') {
segment = encode(String(value), token)
if (!matches[i].test(segment)) {
throw new TypeError('Expected "' + token.name + '" to match "' + token.pattern + '", but got "' + segment + '"')
}
path += token.prefix + segment
continue
}
if (token.optional) {
// Prepend partial segment prefixes.
if (token.partial) path += token.prefix
continue
}
throw new TypeError('Expected "' + token.name + '" to be ' + (token.repeat ? 'an array' : 'a string'))
}
return path
}
}
/**
* Escape a regular expression string.
*
* @param {string} str
* @return {string}
*/
function escapeString (str) {
return str.replace(/([.+*?=^!:${}()[\]|/\\])/g, '\\$1')
}
/**
* Escape the capturing group by escaping special characters and meaning.
*
* @param {string} group
* @return {string}
*/
function escapeGroup (group) {
return group.replace(/([=!:$/()])/g, '\\$1')
}
/**
* Get the flags for a regexp from the options.
*
* @param {Object} options
* @return {string}
*/
function flags (options) {
return options && options.sensitive ? '' : 'i'
}
/**
* Pull out keys from a regexp.
*
* @param {!RegExp} path
* @param {Array=} keys
* @return {!RegExp}
*/
function regexpToRegexp (path, keys) {
if (!keys) return path
// Use a negative lookahead to match only capturing groups.
var groups = path.source.match(/\((?!\?)/g)
if (groups) {
for (var i = 0; i < groups.length; i++) {
keys.push({
name: i,
prefix: null,
delimiter: null,
optional: false,
repeat: false,
partial: false,
pattern: null
})
}
}
return path
}
/**
* Transform an array into a regexp.
*
* @param {!Array} path
* @param {Array=} keys
* @param {Object=} options
* @return {!RegExp}
*/
function arrayToRegexp (path, keys, options) {
var parts = []
for (var i = 0; i < path.length; i++) {
parts.push(pathToRegexp(path[i], keys, options).source)
}
return new RegExp('(?:' + parts.join('|') + ')', flags(options))
}
/**
* Create a path regexp from string input.
*
* @param {string} path
* @param {Array=} keys
* @param {Object=} options
* @return {!RegExp}
*/
function stringToRegexp (path, keys, options) {
return tokensToRegExp(parse(path, options), keys, options)
}
/**
* Expose a function for taking tokens and returning a RegExp.
*
* @param {!Array} tokens
* @param {Array=} keys
* @param {Object=} options
* @return {!RegExp}
*/
function tokensToRegExp (tokens, keys, options) {
options = options || {}
var strict = options.strict
var end = options.end !== false
var delimiter = escapeString(options.delimiter || DEFAULT_DELIMITER)
var delimiters = options.delimiters || DEFAULT_DELIMITERS
var endsWith = [].concat(options.endsWith || []).map(escapeString).concat('$').join('|')
var route = ''
var isEndDelimited = tokens.length === 0
// Iterate over the tokens and create our regexp string.
for (var i = 0; i < tokens.length; i++) {
var token = tokens[i]
if (typeof token === 'string') {
route += escapeString(token)
isEndDelimited = i === tokens.length - 1 && delimiters.indexOf(token[token.length - 1]) > -1
} else {
var prefix = escapeString(token.prefix)
var capture = token.repeat
? '(?:' + token.pattern + ')(?:' + prefix + '(?:' + token.pattern + '))*'
: token.pattern
if (keys) keys.push(token)
if (token.optional) {
if (token.partial) {
route += prefix + '(' + capture + ')?'
} else {
route += '(?:' + prefix + '(' + capture + '))?'
}
} else {
route += prefix + '(' + capture + ')'
}
}
}
if (end) {
if (!strict) route += '(?:' + delimiter + ')?'
route += endsWith === '$' ? '$' : '(?=' + endsWith + ')'
} else {
if (!strict) route += '(?:' + delimiter + '(?=' + endsWith + '))?'
if (!isEndDelimited) route += '(?=' + delimiter + '|' + endsWith + ')'
}
return new RegExp('^' + route, flags(options))
}
/**
* Normalize the given path string, returning a regular expression.
*
* An empty array can be passed in for the keys, which will hold the
* placeholder key descriptions. For example, using `/user/:id`, `keys` will
* contain `[{ name: 'id', delimiter: '/', optional: false, repeat: false }]`.
*
* @param {(string|RegExp|Array)} path
* @param {Array=} keys
* @param {Object=} options
* @return {!RegExp}
*/
function pathToRegexp (path, keys, options) {
if (path instanceof RegExp) {
return regexpToRegexp(path, keys)
}
if (Array.isArray(path)) {
return arrayToRegexp(/** @type {!Array} */ (path), keys, options)
}
return stringToRegexp(/** @type {string} */ (path), keys, options)
}
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