README.md #1

snapdragon-node

Snapdragon utility for creating a new AST node in custom code, such as plugins.

Install

Install with npm:

$ npm install --save snapdragon-node

Usage

With snapdragon v0.9.0 and higher you can use this.node() to create a new Node, whenever it makes sense.

var Node = require('snapdragon-node');
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

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

var node = new Node('*', 'Star');
var node = new Node({type: 'star', val: '*'});

.isNode

Returns true if the given value is a node.

Params

node {Object}
returns {Boolean}

Example

var Node = require('snapdragon-node');
var node = new Node({type: 'foo'});
console.log(Node.isNode(node)); //=> true
console.log(Node.isNode({})); //=> false

.define

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

var node = new Node();
node.define('foo', 'something non-enumerable');

.isEmpty

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

var node = new Node({type: 'text'});
node.isEmpty(); //=> true
node.val = 'foo';
node.isEmpty(); //=> false

.push

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

var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
foo.push(bar);

.unshift

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

var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
foo.unshift(bar);

.pop

Pop a node from node.nodes.

returns {Number}: Returns the popped node

Example

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

Shift a node from node.nodes.

returns {Object}: Returns the shifted node

Example

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

Remove node from node.nodes.

Params

node {Object}
returns {Object}: Returns the removed node.

Example

node.remove(childNode);

.find

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

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

Return true if the node is the given type.

Params

type {String}
returns {Boolean}

Example

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

Return true if the node.nodes has the given type.

Params

type {String}
returns {Boolean}

Example

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

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

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

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

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

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

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

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:

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
.pushNode was renamed to .push
.getNode was renamed to .find

Added

.isNode
.isEmpty
.pop
.shift
.remove

[0.1.0]

First release.

About

Related projects

breakdance: Breakdance is a node.js library for converting HTML to markdown. Highly pluggable, flexible and easy… more | homepage
snapdragon-capture: Snapdragon plugin that adds a capture method to the parser instance. | homepage
snapdragon-cheerio: Snapdragon plugin for converting a cheerio AST to a snapdragon AST. | homepage
snapdragon-util: Utilities for the snapdragon parser/compiler. | homepage
snapdragon: Easy-to-use plugin system for creating powerful, fast and versatile parsers and compilers, with built-in source-map… more | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Please read the contributing guide for advice on opening issues, pull requests, and coding standards.

Building docs

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ 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:

$ npm install && npm test

Author

Jon Schlinkert

License

This file was generated by verb-generate-readme, v0.6.0, on June 25, 2017.

# snapdragon-node [![NPM version](https://img.shields.io/npm/v/snapdragon-node.svg?style=flat)](https://www.npmjs.com/package/snapdragon-node) [![NPM monthly downloads](https://img.shields.io/npm/dm/snapdragon-node.svg?style=flat)](https://npmjs.org/package/snapdragon-node) [![NPM total downloads](https://img.shields.io/npm/dt/snapdragon-node.svg?style=flat)](https://npmjs.org/package/snapdragon-node) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/snapdragon-node.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/snapdragon-node)

> Snapdragon utility for creating a new AST node in custom code, such as plugins.

## Install

Install with [npm](https://www.npmjs.com/):

```sh
$ npm install --save snapdragon-node
```

## Usage

With [snapdragon](https://github.com/jonschlinkert/snapdragon) v0.9.0 and higher you can use `this.node()` to create a new `Node`, whenever it makes sense.

```js
var Node = require('snapdragon-node');
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._

#	Change	User	Description	Committed
#1	23539	jenbottom	Adding the basic code for ember test appk, created with 'ember new' command