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The MIT License (MIT)
Copyright (c) 2014 Blake Embrey (hello@blakeembrey.com)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# Path-to-RegExp
> Turn a path string such as `/user/:name` into a regular expression.
[![NPM version][npm-image]][npm-url]
[![NPM downloads][downloads-image]][downloads-url]
[![Build status][build-image]][build-url]
[![Build coverage][coverage-image]][coverage-url]
[![License][license-image]][license-url]
## Installation
```
npm install path-to-regexp --save
```
## Usage
```javascript
const { pathToRegexp, match, parse, compile } = require("path-to-regexp");
// pathToRegexp(path, keys?, options?)
// match(path)
// parse(path)
// compile(path)
```
### Path to regexp
The `pathToRegexp` function will return a regular expression object based on the provided `path` argument. It accepts the following arguments:
- **path** A string, array of strings, or a regular expression.
- **keys** _(optional)_ An array to populate with keys found in the path.
- **options** _(optional)_
- **sensitive** When `true` the regexp will be case sensitive. (default: `false`)
- **strict** When `true` the regexp won't allow an optional trailing delimiter to match. (default: `false`)
- **end** When `true` the regexp will match to the end of the string. (default: `true`)
- **start** When `true` the regexp will match from the beginning of the string. (default: `true`)
- **delimiter** The default delimiter for segments, e.g. `[^/#?]` for `:named` patterns. (default: `'/#?'`)
- **endsWith** Optional character, or list of characters, to treat as "end" characters.
- **encode** A function to encode strings before inserting into `RegExp`. (default: `x => x`)
- **prefixes** List of characters to automatically consider prefixes when parsing. (default: `./`)
```javascript
const keys = [];
const regexp = pathToRegexp("/foo/:bar", keys);
// regexp = /^\/foo(?:\/([^\/#\?]+?))[\/#\?]?$/i
// keys = [{ name: 'bar', prefix: '/', suffix: '', pattern: '[^\\/#\\?]+?', modifier: '' }]
```
**Please note:** The `RegExp` returned by `path-to-regexp` is intended for ordered data (e.g. pathnames, hostnames). It can not handle arbitrarily ordered data (e.g. query strings, URL fragments, JSON, etc). When using paths that contain query strings, you need to escape the question mark (`?`) to ensure it does not flag the parameter as [optional](#optional).
### Parameters
The path argument is used to define parameters and populate keys.
#### Named Parameters
Named parameters are defined by prefixing a colon to the parameter name (`:foo`).
```js
const regexp = pathToRegexp("/:foo/:bar");
// keys = [{ name: 'foo', prefix: '/', ... }, { name: 'bar', prefix: '/', ... }]
regexp.exec("/test/route");
//=> [ '/test/route', 'test', 'route', index: 0, input: '/test/route', groups: undefined ]
```
**Please note:** Parameter names must use "word characters" (`[A-Za-z0-9_]`).
##### Custom Matching Parameters
Parameters can have a custom regexp, which overrides the default match (`[^/]+`). For example, you can match digits or names in a path:
```js
const regexpNumbers = pathToRegexp("/icon-:foo(\\d+).png");
// keys = [{ name: 'foo', ... }]
regexpNumbers.exec("/icon-123.png");
//=> ['/icon-123.png', '123']
regexpNumbers.exec("/icon-abc.png");
//=> null
const regexpWord = pathToRegexp("/(user|u)");
// keys = [{ name: 0, ... }]
regexpWord.exec("/u");
//=> ['/u', 'u']
regexpWord.exec("/users");
//=> null
```
**Tip:** Backslashes need to be escaped with another backslash in JavaScript strings.
##### Custom Prefix and Suffix
Parameters can be wrapped in `{}` to create custom prefixes or suffixes for your segment:
```js
const regexp = pathToRegexp("/:attr1?{-:attr2}?{-:attr3}?");
regexp.exec("/test");
// => ['/test', 'test', undefined, undefined]
regexp.exec("/test-test");
// => ['/test', 'test', 'test', undefined]
```
#### Unnamed Parameters
It is possible to write an unnamed parameter that only consists of a regexp. It works the same the named parameter, except it will be numerically indexed:
```js
const regexp = pathToRegexp("/:foo/(.*)");
// keys = [{ name: 'foo', ... }, { name: 0, ... }]
regexp.exec("/test/route");
//=> [ '/test/route', 'test', 'route', index: 0, input: '/test/route', groups: undefined ]
```
#### Modifiers
Modifiers must be placed after the parameter (e.g. `/:foo?`, `/(test)?`, `/:foo(test)?`, or `{-:foo(test)}?`).
##### Optional
Parameters can be suffixed with a question mark (`?`) to make the parameter optional.
```js
const regexp = pathToRegexp("/:foo/:bar?");
// keys = [{ name: 'foo', ... }, { name: 'bar', prefix: '/', modifier: '?' }]
regexp.exec("/test");
//=> [ '/test', 'test', undefined, index: 0, input: '/test', groups: undefined ]
regexp.exec("/test/route");
//=> [ '/test/route', 'test', 'route', index: 0, input: '/test/route', groups: undefined ]
```
**Tip:** The prefix is also optional, escape the prefix `\/` to make it required.
When dealing with query strings, escape the question mark (`?`) so it doesn't mark the parameter as optional. Handling unordered data is outside the scope of this library.
```js
const regexp = pathToRegexp("/search/:tableName\\?useIndex=true&term=amazing");
regexp.exec("/search/people?useIndex=true&term=amazing");
//=> [ '/search/people?useIndex=true&term=amazing', 'people', index: 0, input: '/search/people?useIndex=true&term=amazing', groups: undefined ]
// This library does not handle query strings in different orders
regexp.exec("/search/people?term=amazing&useIndex=true");
//=> null
```
##### Zero or more
Parameters can be suffixed with an asterisk (`*`) to denote a zero or more parameter matches.
```js
const regexp = pathToRegexp("/:foo*");
// keys = [{ name: 'foo', prefix: '/', modifier: '*' }]
regexp.exec("/");
//=> [ '/', undefined, index: 0, input: '/', groups: undefined ]
regexp.exec("/bar/baz");
//=> [ '/bar/baz', 'bar/baz', index: 0, input: '/bar/baz', groups: undefined ]
```
##### One or more
Parameters can be suffixed with a plus sign (`+`) to denote a one or more parameter matches.
```js
const regexp = pathToRegexp("/:foo+");
// keys = [{ name: 'foo', prefix: '/', modifier: '+' }]
regexp.exec("/");
//=> null
regexp.exec("/bar/baz");
//=> [ '/bar/baz','bar/baz', index: 0, input: '/bar/baz', groups: undefined ]
```
### Match
The `match` function will return a function for transforming paths into parameters:
```js
// Make sure you consistently `decode` segments.
const fn = match("/user/:id", { decode: decodeURIComponent });
fn("/user/123"); //=> { path: '/user/123', index: 0, params: { id: '123' } }
fn("/invalid"); //=> false
fn("/user/caf%C3%A9"); //=> { path: '/user/caf%C3%A9', index: 0, params: { id: 'café' } }
```
The `match` function can be used to custom match named parameters. For example, this can be used to whitelist a small number of valid paths:
```js
const urlMatch = match("/users/:id/:tab(home|photos|bio)", {
decode: decodeURIComponent,
});
urlMatch("/users/1234/photos");
//=> { path: '/users/1234/photos', index: 0, params: { id: '1234', tab: 'photos' } }
urlMatch("/users/1234/bio");
//=> { path: '/users/1234/bio', index: 0, params: { id: '1234', tab: 'bio' } }
urlMatch("/users/1234/otherstuff");
//=> false
```
#### Process Pathname
You should make sure variations of the same path match the expected `path`. Here's one possible solution using `encode`:
```js
const fn = match("/café", { encode: encodeURI });
fn("/caf%C3%A9"); //=> { path: '/caf%C3%A9', index: 0, params: {} }
```
**Note:** [`URL`](https://developer.mozilla.org/en-US/docs/Web/API/URL) encodes paths, so `/café` would be normalized to `/caf%C3%A9` and match in the above example.
##### Alternative Using Normalize
Sometimes you won't have already normalized paths to use, so you could normalize it yourself before matching:
```js
/**
* Normalize a pathname for matching, replaces multiple slashes with a single
* slash and normalizes unicode characters to "NFC". When using this method,
* `decode` should be an identity function so you don't decode strings twice.
*/
function normalizePathname(pathname: string) {
return (
decodeURI(pathname)
// Replaces repeated slashes in the URL.
.replace(/\/+/g, "/")
// Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/normalize
// Note: Missing native IE support, may want to skip this step.
.normalize()
);
}
// Two possible ways of writing `/café`:
const re = pathToRegexp("/caf\u00E9");
const input = encodeURI("/cafe\u0301");
re.test(input); //=> false
re.test(normalizePathname(input)); //=> true
```
### Parse
The `parse` function will return a list of strings and keys from a path string:
```js
const tokens = parse("/route/:foo/(.*)");
console.log(tokens[0]);
//=> "/route"
console.log(tokens[1]);
//=> { name: 'foo', prefix: '/', suffix: '', pattern: '[^\\/#\\?]+?', modifier: '' }
console.log(tokens[2]);
//=> { name: 0, prefix: '/', suffix: '', pattern: '.*', modifier: '' }
```
**Note:** This method only works with strings.
### Compile ("Reverse" Path-To-RegExp)
The `compile` function will return a function for transforming parameters into a valid path:
```js
// Make sure you encode your path segments consistently.
const toPath = compile("/user/:id", { encode: encodeURIComponent });
toPath({ id: 123 }); //=> "/user/123"
toPath({ id: "café" }); //=> "/user/caf%C3%A9"
toPath({ id: "/" }); //=> "/user/%2F"
toPath({ id: ":/" }); //=> "/user/%3A%2F"
// Without `encode`, you need to make sure inputs are encoded correctly.
const toPathRaw = compile("/user/:id");
toPathRaw({ id: "%3A%2F" }); //=> "/user/%3A%2F"
toPathRaw({ id: ":/" }, { validate: false }); //=> "/user/:/"
const toPathRepeated = compile("/:segment+");
toPathRepeated({ segment: "foo" }); //=> "/foo"
toPathRepeated({ segment: ["a", "b", "c"] }); //=> "/a/b/c"
const toPathRegexp = compile("/user/:id(\\d+)");
toPathRegexp({ id: 123 }); //=> "/user/123"
toPathRegexp({ id: "123" }); //=> "/user/123"
toPathRegexp({ id: "abc" }); //=> Throws `TypeError`.
toPathRegexp({ id: "abc" }, { validate: false }); //=> "/user/abc"
```
**Note:** The generated function will throw on invalid input.
### Working with Tokens
Path-To-RegExp exposes the two functions used internally that accept an array of tokens:
- `tokensToRegexp(tokens, keys?, options?)` Transform an array of tokens into a matching regular expression.
- `tokensToFunction(tokens)` Transform an array of tokens into a path generator function.
#### Token Information
- `name` The name of the token (`string` for named or `number` for unnamed index)
- `prefix` The prefix string for the segment (e.g. `"/"`)
- `suffix` The suffix string for the segment (e.g. `""`)
- `pattern` The RegExp used to match this token (`string`)
- `modifier` The modifier character used for the segment (e.g. `?`)
## Compatibility with Express <= 4.x
Path-To-RegExp breaks compatibility with Express <= `4.x`:
- RegExp special characters can only be used in a parameter
- Express.js 4.x supported `RegExp` special characters regardless of position - this is considered a bug
- Parameters have suffixes that augment meaning - `*`, `+` and `?`. E.g. `/:user*`
- No wildcard asterisk (`*`) - use parameters instead (`(.*)` or `:splat*`)
## Live Demo
You can see a live demo of this library in use at [express-route-tester](http://forbeslindesay.github.io/express-route-tester/).
## License
MIT
[npm-image]: https://img.shields.io/npm/v/path-to-regexp
[npm-url]: https://npmjs.org/package/path-to-regexp
[downloads-image]: https://img.shields.io/npm/dm/path-to-regexp
[downloads-url]: https://npmjs.org/package/path-to-regexp
[build-image]: https://img.shields.io/github/workflow/status/pillarjs/path-to-regexp/CI/master
[build-url]: https://github.com/pillarjs/path-to-regexp/actions/workflows/ci.yml?query=branch%3Amaster
[coverage-image]: https://img.shields.io/codecov/c/gh/pillarjs/path-to-regexp
[coverage-url]: https://codecov.io/gh/pillarjs/path-to-regexp
[license-image]: http://img.shields.io/npm/l/path-to-regexp.svg?style=flat
[license-url]: LICENSE.md

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/**
* Tokenize input string.
*/
function lexer(str) {
var tokens = [];
var i = 0;
while (i < str.length) {
var char = str[i];
if (char === "*" || char === "+" || char === "?") {
tokens.push({ type: "MODIFIER", index: i, value: str[i++] });
continue;
}
if (char === "\\") {
tokens.push({ type: "ESCAPED_CHAR", index: i++, value: str[i++] });
continue;
}
if (char === "{") {
tokens.push({ type: "OPEN", index: i, value: str[i++] });
continue;
}
if (char === "}") {
tokens.push({ type: "CLOSE", index: i, value: str[i++] });
continue;
}
if (char === ":") {
var name = "";
var j = i + 1;
while (j < str.length) {
var code = str.charCodeAt(j);
if (
// `0-9`
(code >= 48 && code <= 57) ||
// `A-Z`
(code >= 65 && code <= 90) ||
// `a-z`
(code >= 97 && code <= 122) ||
// `_`
code === 95) {
name += str[j++];
continue;
}
break;
}
if (!name)
throw new TypeError("Missing parameter name at ".concat(i));
tokens.push({ type: "NAME", index: i, value: name });
i = j;
continue;
}
if (char === "(") {
var count = 1;
var pattern = "";
var j = i + 1;
if (str[j] === "?") {
throw new TypeError("Pattern cannot start with \"?\" at ".concat(j));
}
while (j < str.length) {
if (str[j] === "\\") {
pattern += str[j++] + str[j++];
continue;
}
if (str[j] === ")") {
count--;
if (count === 0) {
j++;
break;
}
}
else if (str[j] === "(") {
count++;
if (str[j + 1] !== "?") {
throw new TypeError("Capturing groups are not allowed at ".concat(j));
}
}
pattern += str[j++];
}
if (count)
throw new TypeError("Unbalanced pattern at ".concat(i));
if (!pattern)
throw new TypeError("Missing pattern at ".concat(i));
tokens.push({ type: "PATTERN", index: i, value: pattern });
i = j;
continue;
}
tokens.push({ type: "CHAR", index: i, value: str[i++] });
}
tokens.push({ type: "END", index: i, value: "" });
return tokens;
}
/**
* Parse a string for the raw tokens.
*/
export function parse(str, options) {
if (options === void 0) { options = {}; }
var tokens = lexer(str);
var _a = options.prefixes, prefixes = _a === void 0 ? "./" : _a;
var defaultPattern = "[^".concat(escapeString(options.delimiter || "/#?"), "]+?");
var result = [];
var key = 0;
var i = 0;
var path = "";
var tryConsume = function (type) {
if (i < tokens.length && tokens[i].type === type)
return tokens[i++].value;
};
var mustConsume = function (type) {
var value = tryConsume(type);
if (value !== undefined)
return value;
var _a = tokens[i], nextType = _a.type, index = _a.index;
throw new TypeError("Unexpected ".concat(nextType, " at ").concat(index, ", expected ").concat(type));
};
var consumeText = function () {
var result = "";
var value;
while ((value = tryConsume("CHAR") || tryConsume("ESCAPED_CHAR"))) {
result += value;
}
return result;
};
while (i < tokens.length) {
var char = tryConsume("CHAR");
var name = tryConsume("NAME");
var pattern = tryConsume("PATTERN");
if (name || pattern) {
var prefix = char || "";
if (prefixes.indexOf(prefix) === -1) {
path += prefix;
prefix = "";
}
if (path) {
result.push(path);
path = "";
}
result.push({
name: name || key++,
prefix: prefix,
suffix: "",
pattern: pattern || defaultPattern,
modifier: tryConsume("MODIFIER") || "",
});
continue;
}
var value = char || tryConsume("ESCAPED_CHAR");
if (value) {
path += value;
continue;
}
if (path) {
result.push(path);
path = "";
}
var open = tryConsume("OPEN");
if (open) {
var prefix = consumeText();
var name_1 = tryConsume("NAME") || "";
var pattern_1 = tryConsume("PATTERN") || "";
var suffix = consumeText();
mustConsume("CLOSE");
result.push({
name: name_1 || (pattern_1 ? key++ : ""),
pattern: name_1 && !pattern_1 ? defaultPattern : pattern_1,
prefix: prefix,
suffix: suffix,
modifier: tryConsume("MODIFIER") || "",
});
continue;
}
mustConsume("END");
}
return result;
}
/**
* Compile a string to a template function for the path.
*/
export function compile(str, options) {
return tokensToFunction(parse(str, options), options);
}
/**
* Expose a method for transforming tokens into the path function.
*/
export function tokensToFunction(tokens, options) {
if (options === void 0) { options = {}; }
var reFlags = flags(options);
var _a = options.encode, encode = _a === void 0 ? function (x) { return x; } : _a, _b = options.validate, validate = _b === void 0 ? true : _b;
// Compile all the tokens into regexps.
var matches = tokens.map(function (token) {
if (typeof token === "object") {
return new RegExp("^(?:".concat(token.pattern, ")$"), reFlags);
}
});
return function (data) {
var path = "";
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 optional = token.modifier === "?" || token.modifier === "*";
var repeat = token.modifier === "*" || token.modifier === "+";
if (Array.isArray(value)) {
if (!repeat) {
throw new TypeError("Expected \"".concat(token.name, "\" to not repeat, but got an array"));
}
if (value.length === 0) {
if (optional)
continue;
throw new TypeError("Expected \"".concat(token.name, "\" to not be empty"));
}
for (var j = 0; j < value.length; j++) {
var segment = encode(value[j], token);
if (validate && !matches[i].test(segment)) {
throw new TypeError("Expected all \"".concat(token.name, "\" to match \"").concat(token.pattern, "\", but got \"").concat(segment, "\""));
}
path += token.prefix + segment + token.suffix;
}
continue;
}
if (typeof value === "string" || typeof value === "number") {
var segment = encode(String(value), token);
if (validate && !matches[i].test(segment)) {
throw new TypeError("Expected \"".concat(token.name, "\" to match \"").concat(token.pattern, "\", but got \"").concat(segment, "\""));
}
path += token.prefix + segment + token.suffix;
continue;
}
if (optional)
continue;
var typeOfMessage = repeat ? "an array" : "a string";
throw new TypeError("Expected \"".concat(token.name, "\" to be ").concat(typeOfMessage));
}
return path;
};
}
/**
* Create path match function from `path-to-regexp` spec.
*/
export function match(str, options) {
var keys = [];
var re = pathToRegexp(str, keys, options);
return regexpToFunction(re, keys, options);
}
/**
* Create a path match function from `path-to-regexp` output.
*/
export function regexpToFunction(re, keys, options) {
if (options === void 0) { options = {}; }
var _a = options.decode, decode = _a === void 0 ? function (x) { return x; } : _a;
return function (pathname) {
var m = re.exec(pathname);
if (!m)
return false;
var path = m[0], index = m.index;
var params = Object.create(null);
var _loop_1 = function (i) {
if (m[i] === undefined)
return "continue";
var key = keys[i - 1];
if (key.modifier === "*" || key.modifier === "+") {
params[key.name] = m[i].split(key.prefix + key.suffix).map(function (value) {
return decode(value, key);
});
}
else {
params[key.name] = decode(m[i], key);
}
};
for (var i = 1; i < m.length; i++) {
_loop_1(i);
}
return { path: path, index: index, params: params };
};
}
/**
* Escape a regular expression string.
*/
function escapeString(str) {
return str.replace(/([.+*?=^!:${}()[\]|/\\])/g, "\\$1");
}
/**
* Get the flags for a regexp from the options.
*/
function flags(options) {
return options && options.sensitive ? "" : "i";
}
/**
* Pull out keys from a regexp.
*/
function regexpToRegexp(path, keys) {
if (!keys)
return path;
var groupsRegex = /\((?:\?<(.*?)>)?(?!\?)/g;
var index = 0;
var execResult = groupsRegex.exec(path.source);
while (execResult) {
keys.push({
// Use parenthesized substring match if available, index otherwise
name: execResult[1] || index++,
prefix: "",
suffix: "",
modifier: "",
pattern: "",
});
execResult = groupsRegex.exec(path.source);
}
return path;
}
/**
* Transform an array into a regexp.
*/
function arrayToRegexp(paths, keys, options) {
var parts = paths.map(function (path) { return pathToRegexp(path, keys, options).source; });
return new RegExp("(?:".concat(parts.join("|"), ")"), flags(options));
}
/**
* Create a path regexp from string input.
*/
function stringToRegexp(path, keys, options) {
return tokensToRegexp(parse(path, options), keys, options);
}
/**
* Expose a function for taking tokens and returning a RegExp.
*/
export function tokensToRegexp(tokens, keys, options) {
if (options === void 0) { options = {}; }
var _a = options.strict, strict = _a === void 0 ? false : _a, _b = options.start, start = _b === void 0 ? true : _b, _c = options.end, end = _c === void 0 ? true : _c, _d = options.encode, encode = _d === void 0 ? function (x) { return x; } : _d, _e = options.delimiter, delimiter = _e === void 0 ? "/#?" : _e, _f = options.endsWith, endsWith = _f === void 0 ? "" : _f;
var endsWithRe = "[".concat(escapeString(endsWith), "]|$");
var delimiterRe = "[".concat(escapeString(delimiter), "]");
var route = start ? "^" : "";
// Iterate over the tokens and create our regexp string.
for (var _i = 0, tokens_1 = tokens; _i < tokens_1.length; _i++) {
var token = tokens_1[_i];
if (typeof token === "string") {
route += escapeString(encode(token));
}
else {
var prefix = escapeString(encode(token.prefix));
var suffix = escapeString(encode(token.suffix));
if (token.pattern) {
if (keys)
keys.push(token);
if (prefix || suffix) {
if (token.modifier === "+" || token.modifier === "*") {
var mod = token.modifier === "*" ? "?" : "";
route += "(?:".concat(prefix, "((?:").concat(token.pattern, ")(?:").concat(suffix).concat(prefix, "(?:").concat(token.pattern, "))*)").concat(suffix, ")").concat(mod);
}
else {
route += "(?:".concat(prefix, "(").concat(token.pattern, ")").concat(suffix, ")").concat(token.modifier);
}
}
else {
if (token.modifier === "+" || token.modifier === "*") {
route += "((?:".concat(token.pattern, ")").concat(token.modifier, ")");
}
else {
route += "(".concat(token.pattern, ")").concat(token.modifier);
}
}
}
else {
route += "(?:".concat(prefix).concat(suffix, ")").concat(token.modifier);
}
}
}
if (end) {
if (!strict)
route += "".concat(delimiterRe, "?");
route += !options.endsWith ? "$" : "(?=".concat(endsWithRe, ")");
}
else {
var endToken = tokens[tokens.length - 1];
var isEndDelimited = typeof endToken === "string"
? delimiterRe.indexOf(endToken[endToken.length - 1]) > -1
: endToken === undefined;
if (!strict) {
route += "(?:".concat(delimiterRe, "(?=").concat(endsWithRe, "))?");
}
if (!isEndDelimited) {
route += "(?=".concat(delimiterRe, "|").concat(endsWithRe, ")");
}
}
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 }]`.
*/
export function pathToRegexp(path, keys, options) {
if (path instanceof RegExp)
return regexpToRegexp(path, keys);
if (Array.isArray(path))
return arrayToRegexp(path, keys, options);
return stringToRegexp(path, keys, options);
}
//# sourceMappingURL=index.js.map

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export interface ParseOptions {
/**
* Set the default delimiter for repeat parameters. (default: `'/'`)
*/
delimiter?: string;
/**
* List of characters to automatically consider prefixes when parsing.
*/
prefixes?: string;
}
/**
* Parse a string for the raw tokens.
*/
export declare function parse(str: string, options?: ParseOptions): Token[];
export interface TokensToFunctionOptions {
/**
* When `true` the regexp will be case sensitive. (default: `false`)
*/
sensitive?: boolean;
/**
* Function for encoding input strings for output.
*/
encode?: (value: string, token: Key) => string;
/**
* When `false` the function can produce an invalid (unmatched) path. (default: `true`)
*/
validate?: boolean;
}
/**
* Compile a string to a template function for the path.
*/
export declare function compile<P extends object = object>(str: string, options?: ParseOptions & TokensToFunctionOptions): PathFunction<P>;
export declare type PathFunction<P extends object = object> = (data?: P) => string;
/**
* Expose a method for transforming tokens into the path function.
*/
export declare function tokensToFunction<P extends object = object>(tokens: Token[], options?: TokensToFunctionOptions): PathFunction<P>;
export interface RegexpToFunctionOptions {
/**
* Function for decoding strings for params.
*/
decode?: (value: string, token: Key) => string;
}
/**
* A match result contains data about the path match.
*/
export interface MatchResult<P extends object = object> {
path: string;
index: number;
params: P;
}
/**
* A match is either `false` (no match) or a match result.
*/
export declare type Match<P extends object = object> = false | MatchResult<P>;
/**
* The match function takes a string and returns whether it matched the path.
*/
export declare type MatchFunction<P extends object = object> = (path: string) => Match<P>;
/**
* Create path match function from `path-to-regexp` spec.
*/
export declare function match<P extends object = object>(str: Path, options?: ParseOptions & TokensToRegexpOptions & RegexpToFunctionOptions): MatchFunction<P>;
/**
* Create a path match function from `path-to-regexp` output.
*/
export declare function regexpToFunction<P extends object = object>(re: RegExp, keys: Key[], options?: RegexpToFunctionOptions): MatchFunction<P>;
/**
* Metadata about a key.
*/
export interface Key {
name: string | number;
prefix: string;
suffix: string;
pattern: string;
modifier: string;
}
/**
* A token is a string (nothing special) or key metadata (capture group).
*/
export declare type Token = string | Key;
export interface TokensToRegexpOptions {
/**
* When `true` the regexp will be case sensitive. (default: `false`)
*/
sensitive?: boolean;
/**
* When `true` the regexp won't allow an optional trailing delimiter to match. (default: `false`)
*/
strict?: boolean;
/**
* When `true` the regexp will match to the end of the string. (default: `true`)
*/
end?: boolean;
/**
* When `true` the regexp will match from the beginning of the string. (default: `true`)
*/
start?: boolean;
/**
* Sets the final character for non-ending optimistic matches. (default: `/`)
*/
delimiter?: string;
/**
* List of characters that can also be "end" characters.
*/
endsWith?: string;
/**
* Encode path tokens for use in the `RegExp`.
*/
encode?: (value: string) => string;
}
/**
* Expose a function for taking tokens and returning a RegExp.
*/
export declare function tokensToRegexp(tokens: Token[], keys?: Key[], options?: TokensToRegexpOptions): RegExp;
/**
* Supported `path-to-regexp` input types.
*/
export declare type Path = string | RegExp | Array<string | RegExp>;
/**
* 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 }]`.
*/
export declare function pathToRegexp(path: Path, keys?: Key[], options?: TokensToRegexpOptions & ParseOptions): RegExp;

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.pathToRegexp = exports.tokensToRegexp = exports.regexpToFunction = exports.match = exports.tokensToFunction = exports.compile = exports.parse = void 0;
/**
* Tokenize input string.
*/
function lexer(str) {
var tokens = [];
var i = 0;
while (i < str.length) {
var char = str[i];
if (char === "*" || char === "+" || char === "?") {
tokens.push({ type: "MODIFIER", index: i, value: str[i++] });
continue;
}
if (char === "\\") {
tokens.push({ type: "ESCAPED_CHAR", index: i++, value: str[i++] });
continue;
}
if (char === "{") {
tokens.push({ type: "OPEN", index: i, value: str[i++] });
continue;
}
if (char === "}") {
tokens.push({ type: "CLOSE", index: i, value: str[i++] });
continue;
}
if (char === ":") {
var name = "";
var j = i + 1;
while (j < str.length) {
var code = str.charCodeAt(j);
if (
// `0-9`
(code >= 48 && code <= 57) ||
// `A-Z`
(code >= 65 && code <= 90) ||
// `a-z`
(code >= 97 && code <= 122) ||
// `_`
code === 95) {
name += str[j++];
continue;
}
break;
}
if (!name)
throw new TypeError("Missing parameter name at ".concat(i));
tokens.push({ type: "NAME", index: i, value: name });
i = j;
continue;
}
if (char === "(") {
var count = 1;
var pattern = "";
var j = i + 1;
if (str[j] === "?") {
throw new TypeError("Pattern cannot start with \"?\" at ".concat(j));
}
while (j < str.length) {
if (str[j] === "\\") {
pattern += str[j++] + str[j++];
continue;
}
if (str[j] === ")") {
count--;
if (count === 0) {
j++;
break;
}
}
else if (str[j] === "(") {
count++;
if (str[j + 1] !== "?") {
throw new TypeError("Capturing groups are not allowed at ".concat(j));
}
}
pattern += str[j++];
}
if (count)
throw new TypeError("Unbalanced pattern at ".concat(i));
if (!pattern)
throw new TypeError("Missing pattern at ".concat(i));
tokens.push({ type: "PATTERN", index: i, value: pattern });
i = j;
continue;
}
tokens.push({ type: "CHAR", index: i, value: str[i++] });
}
tokens.push({ type: "END", index: i, value: "" });
return tokens;
}
/**
* Parse a string for the raw tokens.
*/
function parse(str, options) {
if (options === void 0) { options = {}; }
var tokens = lexer(str);
var _a = options.prefixes, prefixes = _a === void 0 ? "./" : _a;
var defaultPattern = "[^".concat(escapeString(options.delimiter || "/#?"), "]+?");
var result = [];
var key = 0;
var i = 0;
var path = "";
var tryConsume = function (type) {
if (i < tokens.length && tokens[i].type === type)
return tokens[i++].value;
};
var mustConsume = function (type) {
var value = tryConsume(type);
if (value !== undefined)
return value;
var _a = tokens[i], nextType = _a.type, index = _a.index;
throw new TypeError("Unexpected ".concat(nextType, " at ").concat(index, ", expected ").concat(type));
};
var consumeText = function () {
var result = "";
var value;
while ((value = tryConsume("CHAR") || tryConsume("ESCAPED_CHAR"))) {
result += value;
}
return result;
};
while (i < tokens.length) {
var char = tryConsume("CHAR");
var name = tryConsume("NAME");
var pattern = tryConsume("PATTERN");
if (name || pattern) {
var prefix = char || "";
if (prefixes.indexOf(prefix) === -1) {
path += prefix;
prefix = "";
}
if (path) {
result.push(path);
path = "";
}
result.push({
name: name || key++,
prefix: prefix,
suffix: "",
pattern: pattern || defaultPattern,
modifier: tryConsume("MODIFIER") || "",
});
continue;
}
var value = char || tryConsume("ESCAPED_CHAR");
if (value) {
path += value;
continue;
}
if (path) {
result.push(path);
path = "";
}
var open = tryConsume("OPEN");
if (open) {
var prefix = consumeText();
var name_1 = tryConsume("NAME") || "";
var pattern_1 = tryConsume("PATTERN") || "";
var suffix = consumeText();
mustConsume("CLOSE");
result.push({
name: name_1 || (pattern_1 ? key++ : ""),
pattern: name_1 && !pattern_1 ? defaultPattern : pattern_1,
prefix: prefix,
suffix: suffix,
modifier: tryConsume("MODIFIER") || "",
});
continue;
}
mustConsume("END");
}
return result;
}
exports.parse = parse;
/**
* Compile a string to a template function for the path.
*/
function compile(str, options) {
return tokensToFunction(parse(str, options), options);
}
exports.compile = compile;
/**
* Expose a method for transforming tokens into the path function.
*/
function tokensToFunction(tokens, options) {
if (options === void 0) { options = {}; }
var reFlags = flags(options);
var _a = options.encode, encode = _a === void 0 ? function (x) { return x; } : _a, _b = options.validate, validate = _b === void 0 ? true : _b;
// Compile all the tokens into regexps.
var matches = tokens.map(function (token) {
if (typeof token === "object") {
return new RegExp("^(?:".concat(token.pattern, ")$"), reFlags);
}
});
return function (data) {
var path = "";
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 optional = token.modifier === "?" || token.modifier === "*";
var repeat = token.modifier === "*" || token.modifier === "+";
if (Array.isArray(value)) {
if (!repeat) {
throw new TypeError("Expected \"".concat(token.name, "\" to not repeat, but got an array"));
}
if (value.length === 0) {
if (optional)
continue;
throw new TypeError("Expected \"".concat(token.name, "\" to not be empty"));
}
for (var j = 0; j < value.length; j++) {
var segment = encode(value[j], token);
if (validate && !matches[i].test(segment)) {
throw new TypeError("Expected all \"".concat(token.name, "\" to match \"").concat(token.pattern, "\", but got \"").concat(segment, "\""));
}
path += token.prefix + segment + token.suffix;
}
continue;
}
if (typeof value === "string" || typeof value === "number") {
var segment = encode(String(value), token);
if (validate && !matches[i].test(segment)) {
throw new TypeError("Expected \"".concat(token.name, "\" to match \"").concat(token.pattern, "\", but got \"").concat(segment, "\""));
}
path += token.prefix + segment + token.suffix;
continue;
}
if (optional)
continue;
var typeOfMessage = repeat ? "an array" : "a string";
throw new TypeError("Expected \"".concat(token.name, "\" to be ").concat(typeOfMessage));
}
return path;
};
}
exports.tokensToFunction = tokensToFunction;
/**
* Create path match function from `path-to-regexp` spec.
*/
function match(str, options) {
var keys = [];
var re = pathToRegexp(str, keys, options);
return regexpToFunction(re, keys, options);
}
exports.match = match;
/**
* Create a path match function from `path-to-regexp` output.
*/
function regexpToFunction(re, keys, options) {
if (options === void 0) { options = {}; }
var _a = options.decode, decode = _a === void 0 ? function (x) { return x; } : _a;
return function (pathname) {
var m = re.exec(pathname);
if (!m)
return false;
var path = m[0], index = m.index;
var params = Object.create(null);
var _loop_1 = function (i) {
if (m[i] === undefined)
return "continue";
var key = keys[i - 1];
if (key.modifier === "*" || key.modifier === "+") {
params[key.name] = m[i].split(key.prefix + key.suffix).map(function (value) {
return decode(value, key);
});
}
else {
params[key.name] = decode(m[i], key);
}
};
for (var i = 1; i < m.length; i++) {
_loop_1(i);
}
return { path: path, index: index, params: params };
};
}
exports.regexpToFunction = regexpToFunction;
/**
* Escape a regular expression string.
*/
function escapeString(str) {
return str.replace(/([.+*?=^!:${}()[\]|/\\])/g, "\\$1");
}
/**
* Get the flags for a regexp from the options.
*/
function flags(options) {
return options && options.sensitive ? "" : "i";
}
/**
* Pull out keys from a regexp.
*/
function regexpToRegexp(path, keys) {
if (!keys)
return path;
var groupsRegex = /\((?:\?<(.*?)>)?(?!\?)/g;
var index = 0;
var execResult = groupsRegex.exec(path.source);
while (execResult) {
keys.push({
// Use parenthesized substring match if available, index otherwise
name: execResult[1] || index++,
prefix: "",
suffix: "",
modifier: "",
pattern: "",
});
execResult = groupsRegex.exec(path.source);
}
return path;
}
/**
* Transform an array into a regexp.
*/
function arrayToRegexp(paths, keys, options) {
var parts = paths.map(function (path) { return pathToRegexp(path, keys, options).source; });
return new RegExp("(?:".concat(parts.join("|"), ")"), flags(options));
}
/**
* Create a path regexp from string input.
*/
function stringToRegexp(path, keys, options) {
return tokensToRegexp(parse(path, options), keys, options);
}
/**
* Expose a function for taking tokens and returning a RegExp.
*/
function tokensToRegexp(tokens, keys, options) {
if (options === void 0) { options = {}; }
var _a = options.strict, strict = _a === void 0 ? false : _a, _b = options.start, start = _b === void 0 ? true : _b, _c = options.end, end = _c === void 0 ? true : _c, _d = options.encode, encode = _d === void 0 ? function (x) { return x; } : _d, _e = options.delimiter, delimiter = _e === void 0 ? "/#?" : _e, _f = options.endsWith, endsWith = _f === void 0 ? "" : _f;
var endsWithRe = "[".concat(escapeString(endsWith), "]|$");
var delimiterRe = "[".concat(escapeString(delimiter), "]");
var route = start ? "^" : "";
// Iterate over the tokens and create our regexp string.
for (var _i = 0, tokens_1 = tokens; _i < tokens_1.length; _i++) {
var token = tokens_1[_i];
if (typeof token === "string") {
route += escapeString(encode(token));
}
else {
var prefix = escapeString(encode(token.prefix));
var suffix = escapeString(encode(token.suffix));
if (token.pattern) {
if (keys)
keys.push(token);
if (prefix || suffix) {
if (token.modifier === "+" || token.modifier === "*") {
var mod = token.modifier === "*" ? "?" : "";
route += "(?:".concat(prefix, "((?:").concat(token.pattern, ")(?:").concat(suffix).concat(prefix, "(?:").concat(token.pattern, "))*)").concat(suffix, ")").concat(mod);
}
else {
route += "(?:".concat(prefix, "(").concat(token.pattern, ")").concat(suffix, ")").concat(token.modifier);
}
}
else {
if (token.modifier === "+" || token.modifier === "*") {
route += "((?:".concat(token.pattern, ")").concat(token.modifier, ")");
}
else {
route += "(".concat(token.pattern, ")").concat(token.modifier);
}
}
}
else {
route += "(?:".concat(prefix).concat(suffix, ")").concat(token.modifier);
}
}
}
if (end) {
if (!strict)
route += "".concat(delimiterRe, "?");
route += !options.endsWith ? "$" : "(?=".concat(endsWithRe, ")");
}
else {
var endToken = tokens[tokens.length - 1];
var isEndDelimited = typeof endToken === "string"
? delimiterRe.indexOf(endToken[endToken.length - 1]) > -1
: endToken === undefined;
if (!strict) {
route += "(?:".concat(delimiterRe, "(?=").concat(endsWithRe, "))?");
}
if (!isEndDelimited) {
route += "(?=".concat(delimiterRe, "|").concat(endsWithRe, ")");
}
}
return new RegExp(route, flags(options));
}
exports.tokensToRegexp = tokensToRegexp;
/**
* 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 }]`.
*/
function pathToRegexp(path, keys, options) {
if (path instanceof RegExp)
return regexpToRegexp(path, keys);
if (Array.isArray(path))
return arrayToRegexp(path, keys, options);
return stringToRegexp(path, keys, options);
}
exports.pathToRegexp = pathToRegexp;
//# sourceMappingURL=index.js.map

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{
"name": "path-to-regexp",
"version": "6.2.1",
"publishConfig": {
"access": "public"
},
"description": "Express style path to RegExp utility",
"license": "MIT",
"repository": {
"type": "git",
"url": "https://github.com/pillarjs/path-to-regexp.git"
},
"main": "dist/index.js",
"module": "dist.es2015/index.js",
"scripts": {
"build": "ts-scripts build",
"format": "ts-scripts format",
"lint": "ts-scripts lint",
"prepare": "ts-scripts install && npm run build",
"size": "size-limit",
"specs": "ts-scripts specs",
"test": "ts-scripts test && npm run size"
},
"files": [
"dist.es2015/",
"dist/"
],
"keywords": [
"express",
"regexp",
"route",
"routing"
],
"devDependencies": {
"@borderless/ts-scripts": "^0.8.0",
"@size-limit/preset-small-lib": "^7.0.8",
"@types/jest": "^27.4.0",
"@types/node": "^17.0.17",
"@types/semver": "^7.3.1",
"semver": "^7.3.5",
"size-limit": "^7.0.8",
"typescript": "^4.5.5"
},
"typings": "dist/index.d.ts",
"sideEffects": false,
"size-limit": [
{
"path": "dist.es2015/index.js",
"limit": "2.1 kB"
}
],
"ts-scripts": {
"dist": [
"dist",
"dist.es2015"
],
"project": [
"tsconfig.build.json",
"tsconfig.es2015.json"
]
}
}