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var Snapdragon = require('snapdragon'); var snapdragon = new Snapdragon(); // example usage inside a parser visitor function snapdragon.parser.set('foo', function() { // get the current "start" position var pos = this.position(); // returns the match if regex matches the substring // at the current position on `parser.input` var match = this.match(/foo/); if (match) { // call "pos" on the node, to set the start and end // positions, and return the node to push it onto the AST // (snapdragon will push the node onto the correct // nodes array, based on the stack) return pos(new Node({type: 'bar', val: match[0]})); } }); ``` ## API ### [Node](index.js#L22) Create a new AST `Node` with the given `val` and `type`. **Params** * `val` **{String|Object}**: Pass a matched substring, or an object to merge onto the node. * `type` **{String}**: The node type to use when `val` is a string. * `returns` **{Object}**: node instance **Example** ```js var node = new Node('*', 'Star'); var node = new Node({type: 'star', val: '*'}); ``` ### [.isNode](index.js#L61) Returns true if the given value is a node. **Params** * `node` **{Object}** * `returns` **{Boolean}** **Example** ```js var Node = require('snapdragon-node'); var node = new Node({type: 'foo'}); console.log(Node.isNode(node)); //=> true console.log(Node.isNode({})); //=> false ``` ### [.define](index.js#L80) Define a non-enumberable property on the node instance. Useful for adding properties that shouldn't be extended or visible during debugging. **Params** * `name` **{String}** * `val` **{any}** * `returns` **{Object}**: returns the node instance **Example** ```js var node = new Node(); node.define('foo', 'something non-enumerable'); ``` ### [.isEmpty](index.js#L100) Returns true if `node.val` is an empty string, or `node.nodes` does not contain any non-empty text nodes. **Params** * `fn` **{Function}**: (optional) Filter function that is called on `node` and/or child nodes. `isEmpty` will return false immediately when the filter function returns false on any nodes. * `returns` **{Boolean}** **Example** ```js var node = new Node({type: 'text'}); node.isEmpty(); //=> true node.val = 'foo'; node.isEmpty(); //=> false ``` ### [.push](index.js#L118) Given node `foo` and node `bar`, push node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`. **Params** * `node` **{Object}** * `returns` **{Number}**: Returns the length of `node.nodes` **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); foo.push(bar); ``` ### [.unshift](index.js#L140) Given node `foo` and node `bar`, unshift node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`. **Params** * `node` **{Object}** * `returns` **{Number}**: Returns the length of `node.nodes` **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); foo.unshift(bar); ``` ### [.pop](index.js#L167) Pop a node from `node.nodes`. * `returns` **{Number}**: Returns the popped `node` **Example** ```js var node = new Node({type: 'foo'}); node.push(new Node({type: 'a'})); node.push(new Node({type: 'b'})); node.push(new Node({type: 'c'})); node.push(new Node({type: 'd'})); console.log(node.nodes.length); //=> 4 node.pop(); console.log(node.nodes.length); //=> 3 ``` ### [.shift](index.js#L190) Shift a node from `node.nodes`. * `returns` **{Object}**: Returns the shifted `node` **Example** ```js var node = new Node({type: 'foo'}); node.push(new Node({type: 'a'})); node.push(new Node({type: 'b'})); node.push(new Node({type: 'c'})); node.push(new Node({type: 'd'})); console.log(node.nodes.length); //=> 4 node.shift(); console.log(node.nodes.length); //=> 3 ``` ### [.remove](index.js#L205) Remove `node` from `node.nodes`. **Params** * `node` **{Object}** * `returns` **{Object}**: Returns the removed node. **Example** ```js node.remove(childNode); ``` ### [.find](index.js#L231) Get the first child node from `node.nodes` that matches the given `type`. If `type` is a number, the child node at that index is returned. **Params** * `type` **{String}** * `returns` **{Object}**: Returns a child node or undefined. **Example** ```js var child = node.find(1); //<= index of the node to get var child = node.find('foo'); //<= node.type of a child node var child = node.find(/^(foo|bar)$/); //<= regex to match node.type var child = node.find(['foo', 'bar']); //<= array of node.type(s) ``` ### [.isType](index.js#L249) Return true if the node is the given `type`. **Params** * `type` **{String}** * `returns` **{Boolean}** **Example** ```js var node = new Node({type: 'bar'}); cosole.log(node.isType('foo')); // false cosole.log(node.isType(/^(foo|bar)$/)); // true cosole.log(node.isType(['foo', 'bar'])); // true ``` ### [.hasType](index.js#L270) Return true if the `node.nodes` has the given `type`. **Params** * `type` **{String}** * `returns` **{Boolean}** **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); foo.push(bar); cosole.log(foo.hasType('qux')); // false cosole.log(foo.hasType(/^(qux|bar)$/)); // true cosole.log(foo.hasType(['qux', 'bar'])); // true ``` * `returns` **{Array}** **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); var baz = new Node({type: 'baz'}); foo.push(bar); foo.push(baz); console.log(bar.siblings.length) // 2 console.log(baz.siblings.length) // 2 ``` * `returns` **{Number}** **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); var baz = new Node({type: 'baz'}); var qux = new Node({type: 'qux'}); foo.push(bar); foo.push(baz); foo.unshift(qux); console.log(bar.index) // 1 console.log(baz.index) // 2 console.log(qux.index) // 0 ``` * `returns` **{Object}** **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); var baz = new Node({type: 'baz'}); foo.push(bar); foo.push(baz); console.log(baz.prev.type) // 'bar' ``` * `returns` **{Object}** **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); var baz = new Node({type: 'baz'}); foo.push(bar); foo.push(baz); console.log(bar.siblings.length) // 2 console.log(baz.siblings.length) // 2 ``` * `returns` **{Object}**: The first node, or undefiend **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); var baz = new Node({type: 'baz'}); var qux = new Node({type: 'qux'}); foo.push(bar); foo.push(baz); foo.push(qux); console.log(foo.first.type) // 'bar' ``` * `returns` **{Object}**: The last node, or undefiend **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); var baz = new Node({type: 'baz'}); var qux = new Node({type: 'qux'}); foo.push(bar); foo.push(baz); foo.push(qux); console.log(foo.last.type) // 'qux' ``` * `returns` **{Object}**: The last node, or undefiend **Example** ```js var foo = new Node({type: 'foo'}); var bar = new Node({type: 'bar'}); var baz = new Node({type: 'baz'}); var qux = new Node({type: 'qux'}); foo.push(bar); foo.push(baz); foo.push(qux); console.log(foo.last.type) // 'qux' ``` ## Release history Changelog entries are classified using the following labels from [keep-a-changelog](https://github.com/olivierlacan/keep-a-changelog): * `added`: for new features * `changed`: for changes in existing functionality * `deprecated`: for once-stable features removed in upcoming releases * `removed`: for deprecated features removed in this release * `fixed`: for any bug fixes Custom labels used in this changelog: * `dependencies`: bumps dependencies * `housekeeping`: code re-organization, minor edits, or other changes that don't fit in one of the other categories. ### [2.0.0] - 2017-05-01 **Changed** * `.unshiftNode` was renamed to [.unshift](#unshift) * `.pushNode` was renamed to [.push](#push) * `.getNode` was renamed to [.find](#find) **Added** * [.isNode](#isNode) * [.isEmpty](#isEmpty) * [.pop](#pop) * [.shift](#shift) * [.remove](#remove) ### [0.1.0] First release. ## About ### Related projects * [breakdance](https://www.npmjs.com/package/breakdance): Breakdance is a node.js library for converting HTML to markdown. Highly pluggable, flexible and easy… [more](http://breakdance.io) | [homepage](http://breakdance.io "Breakdance is a node.js library for converting HTML to markdown. Highly pluggable, flexible and easy to use. It's time for your markup to get down.") * [snapdragon-capture](https://www.npmjs.com/package/snapdragon-capture): Snapdragon plugin that adds a capture method to the parser instance. | [homepage](https://github.com/jonschlinkert/snapdragon-capture "Snapdragon plugin that adds a capture method to the parser instance.") * [snapdragon-cheerio](https://www.npmjs.com/package/snapdragon-cheerio): Snapdragon plugin for converting a cheerio AST to a snapdragon AST. | [homepage](https://github.com/jonschlinkert/snapdragon-cheerio "Snapdragon plugin for converting a cheerio AST to a snapdragon AST.") * [snapdragon-util](https://www.npmjs.com/package/snapdragon-util): Utilities for the snapdragon parser/compiler. | [homepage](https://github.com/jonschlinkert/snapdragon-util "Utilities for the snapdragon parser/compiler.") * [snapdragon](https://www.npmjs.com/package/snapdragon): Easy-to-use plugin system for creating powerful, fast and versatile parsers and compilers, with built-in source-map… [more](https://github.com/jonschlinkert/snapdragon) | [homepage](https://github.com/jonschlinkert/snapdragon "Easy-to-use plugin system for creating powerful, fast and versatile parsers and compilers, with built-in source-map support.") ### Contributing Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new). Please read the [contributing guide](.github/contributing.md) for advice on opening issues, pull requests, and coding standards. ### Building docs _(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_ To generate the readme, run the following command: ```sh $ npm install -g verbose/verb#dev verb-generate-readme && verb ``` ### Running tests Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command: ```sh $ npm install && npm test ``` ### Author **Jon Schlinkert** * [github/jonschlinkert](https://github.com/jonschlinkert) * [twitter/jonschlinkert](https://twitter.com/jonschlinkert) ### License Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert). Released under the [MIT License](LICENSE). *** _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on June 25, 2017._