196 lines
6.2 KiB
Markdown
196 lines
6.2 KiB
Markdown
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linkify-it
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==========
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[](https://github.com/markdown-it/linkify-it/actions/workflows/ci.yml)
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[](https://www.npmjs.org/package/linkify-it)
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[](https://coveralls.io/r/markdown-it/linkify-it?branch=master)
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[](https://gitter.im/markdown-it/linkify-it)
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> Links recognition library with FULL unicode support.
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> Focused on high quality link patterns detection in plain text.
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__[Demo](http://markdown-it.github.io/linkify-it/)__
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Why it's awesome:
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- Full unicode support, _with astral characters_!
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- International domains support.
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- Allows rules extension & custom normalizers.
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Install
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-------
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```bash
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npm install linkify-it --save
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```
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Browserification is also supported.
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Usage examples
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--------------
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##### Example 1
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```js
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var linkify = require('linkify-it')();
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// Reload full tlds list & add unofficial `.onion` domain.
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linkify
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.tlds(require('tlds')) // Reload with full tlds list
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.tlds('onion', true) // Add unofficial `.onion` domain
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.add('git:', 'http:') // Add `git:` protocol as "alias"
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.add('ftp:', null) // Disable `ftp:` protocol
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.set({ fuzzyIP: true }); // Enable IPs in fuzzy links (without schema)
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console.log(linkify.test('Site github.com!')); // true
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console.log(linkify.match('Site github.com!')); // [ {
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// schema: "",
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// index: 5,
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// lastIndex: 15,
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// raw: "github.com",
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// text: "github.com",
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// url: "http://github.com",
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// } ]
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```
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##### Example 2. Add twitter mentions handler
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```js
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linkify.add('@', {
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validate: function (text, pos, self) {
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var tail = text.slice(pos);
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if (!self.re.twitter) {
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self.re.twitter = new RegExp(
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'^([a-zA-Z0-9_]){1,15}(?!_)(?=$|' + self.re.src_ZPCc + ')'
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);
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}
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if (self.re.twitter.test(tail)) {
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// Linkifier allows punctuation chars before prefix,
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// but we additionally disable `@` ("@@mention" is invalid)
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if (pos >= 2 && tail[pos - 2] === '@') {
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return false;
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}
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return tail.match(self.re.twitter)[0].length;
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}
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return 0;
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},
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normalize: function (match) {
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match.url = 'https://twitter.com/' + match.url.replace(/^@/, '');
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}
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});
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```
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API
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---
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__[API documentation](http://markdown-it.github.io/linkify-it/doc)__
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### new LinkifyIt(schemas, options)
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Creates new linkifier instance with optional additional schemas.
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Can be called without `new` keyword for convenience.
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By default understands:
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- `http(s)://...` , `ftp://...`, `mailto:...` & `//...` links
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- "fuzzy" links and emails (google.com, foo@bar.com).
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`schemas` is an object, where each key/value describes protocol/rule:
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- __key__ - link prefix (usually, protocol name with `:` at the end, `skype:`
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for example). `linkify-it` makes sure that prefix is not preceded with
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alphanumeric char.
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- __value__ - rule to check tail after link prefix
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- _String_ - just alias to existing rule
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- _Object_
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- _validate_ - either a `RegExp` (start with `^`, and don't include the
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link prefix itself), or a validator function which, given arguments
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_text_, _pos_, and _self_, returns the length of a match in _text_
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starting at index _pos_. _pos_ is the index right after the link prefix.
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_self_ can be used to access the linkify object to cache data.
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- _normalize_ - optional function to normalize text & url of matched result
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(for example, for twitter mentions).
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`options`:
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- __fuzzyLink__ - recognize URL-s without `http(s)://` head. Default `true`.
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- __fuzzyIP__ - allow IPs in fuzzy links above. Can conflict with some texts
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like version numbers. Default `false`.
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- __fuzzyEmail__ - recognize emails without `mailto:` prefix. Default `true`.
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- __---__ - set `true` to terminate link with `---` (if it's considered as long dash).
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### .test(text)
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Searches linkifiable pattern and returns `true` on success or `false` on fail.
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### .pretest(text)
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Quick check if link MAY BE can exist. Can be used to optimize more expensive
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`.test()` calls. Return `false` if link can not be found, `true` - if `.test()`
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call needed to know exactly.
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### .testSchemaAt(text, name, offset)
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Similar to `.test()` but checks only specific protocol tail exactly at given
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position. Returns length of found pattern (0 on fail).
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### .match(text)
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Returns `Array` of found link matches or null if nothing found.
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Each match has:
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- __schema__ - link schema, can be empty for fuzzy links, or `//` for
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protocol-neutral links.
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- __index__ - offset of matched text
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- __lastIndex__ - index of next char after mathch end
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- __raw__ - matched text
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- __text__ - normalized text
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- __url__ - link, generated from matched text
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### .matchAtStart(text)
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Checks if a match exists at the start of the string. Returns `Match`
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(see docs for `match(text)`) or null if no URL is at the start.
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Doesn't work with fuzzy links.
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### .tlds(list[, keepOld])
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Load (or merge) new tlds list. Those are needed for fuzzy links (without schema)
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to avoid false positives. By default:
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- 2-letter root zones are ok.
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- biz|com|edu|gov|net|org|pro|web|xxx|aero|asia|coop|info|museum|name|shop|рф are ok.
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- encoded (`xn--...`) root zones are ok.
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If that's not enough, you can reload defaults with more detailed zones list.
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### .add(key, value)
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Add a new schema to the schemas object. As described in the constructor
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definition, `key` is a link prefix (`skype:`, for example), and `value`
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is a String to alias to another schema, or an Object with `validate` and
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optionally `normalize` definitions. To disable an existing rule, use
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`.add(key, null)`.
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### .set(options)
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Override default options. Missed properties will not be changed.
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## License
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[MIT](https://github.com/markdown-it/linkify-it/blob/master/LICENSE)
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