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453 lines
No EOL
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Markdown
# snapdragon-node [](https://www.npmjs.com/package/snapdragon-node) [](https://npmjs.org/package/snapdragon-node) [](https://npmjs.org/package/snapdragon-node) [](https://travis-ci.org/jonschlinkert/snapdragon-node)
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> Snapdragon utility for creating a new AST node in custom code, such as plugins.
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save snapdragon-node
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```
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## Usage
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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.
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```js
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var Node = require('snapdragon-node');
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var Snapdragon = require('snapdragon');
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var snapdragon = new Snapdragon();
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// example usage inside a parser visitor function
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snapdragon.parser.set('foo', function() {
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// get the current "start" position
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var pos = this.position();
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// returns the match if regex matches the substring
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// at the current position on `parser.input`
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var match = this.match(/foo/);
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if (match) {
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// call "pos" on the node, to set the start and end
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// positions, and return the node to push it onto the AST
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// (snapdragon will push the node onto the correct
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// nodes array, based on the stack)
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return pos(new Node({type: 'bar', val: match[0]}));
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}
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});
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```
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## API
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### [Node](index.js#L22)
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Create a new AST `Node` with the given `val` and `type`.
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**Params**
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* `val` **{String|Object}**: Pass a matched substring, or an object to merge onto the node.
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* `type` **{String}**: The node type to use when `val` is a string.
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* `returns` **{Object}**: node instance
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**Example**
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```js
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var node = new Node('*', 'Star');
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var node = new Node({type: 'star', val: '*'});
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```
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### [.isNode](index.js#L61)
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Returns true if the given value is a node.
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**Params**
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* `node` **{Object}**
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* `returns` **{Boolean}**
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**Example**
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```js
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var Node = require('snapdragon-node');
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var node = new Node({type: 'foo'});
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console.log(Node.isNode(node)); //=> true
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console.log(Node.isNode({})); //=> false
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```
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### [.define](index.js#L80)
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Define a non-enumberable property on the node instance. Useful for adding properties that shouldn't be extended or visible during debugging.
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**Params**
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* `name` **{String}**
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* `val` **{any}**
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* `returns` **{Object}**: returns the node instance
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**Example**
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```js
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var node = new Node();
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node.define('foo', 'something non-enumerable');
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```
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### [.isEmpty](index.js#L100)
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Returns true if `node.val` is an empty string, or `node.nodes` does not contain any non-empty text nodes.
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**Params**
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* `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.
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* `returns` **{Boolean}**
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**Example**
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```js
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var node = new Node({type: 'text'});
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node.isEmpty(); //=> true
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node.val = 'foo';
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node.isEmpty(); //=> false
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```
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### [.push](index.js#L118)
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Given node `foo` and node `bar`, push node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`.
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**Params**
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* `node` **{Object}**
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* `returns` **{Number}**: Returns the length of `node.nodes`
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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foo.push(bar);
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```
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### [.unshift](index.js#L140)
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Given node `foo` and node `bar`, unshift node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`.
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**Params**
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* `node` **{Object}**
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* `returns` **{Number}**: Returns the length of `node.nodes`
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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foo.unshift(bar);
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```
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### [.pop](index.js#L167)
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Pop a node from `node.nodes`.
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* `returns` **{Number}**: Returns the popped `node`
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**Example**
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```js
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var node = new Node({type: 'foo'});
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node.push(new Node({type: 'a'}));
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node.push(new Node({type: 'b'}));
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node.push(new Node({type: 'c'}));
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node.push(new Node({type: 'd'}));
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console.log(node.nodes.length);
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//=> 4
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node.pop();
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console.log(node.nodes.length);
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//=> 3
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```
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### [.shift](index.js#L190)
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Shift a node from `node.nodes`.
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* `returns` **{Object}**: Returns the shifted `node`
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**Example**
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```js
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var node = new Node({type: 'foo'});
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node.push(new Node({type: 'a'}));
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node.push(new Node({type: 'b'}));
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node.push(new Node({type: 'c'}));
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node.push(new Node({type: 'd'}));
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console.log(node.nodes.length);
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//=> 4
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node.shift();
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console.log(node.nodes.length);
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//=> 3
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```
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### [.remove](index.js#L205)
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Remove `node` from `node.nodes`.
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**Params**
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* `node` **{Object}**
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* `returns` **{Object}**: Returns the removed node.
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**Example**
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```js
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node.remove(childNode);
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```
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### [.find](index.js#L231)
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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.
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**Params**
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* `type` **{String}**
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* `returns` **{Object}**: Returns a child node or undefined.
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**Example**
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```js
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var child = node.find(1); //<= index of the node to get
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var child = node.find('foo'); //<= node.type of a child node
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var child = node.find(/^(foo|bar)$/); //<= regex to match node.type
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var child = node.find(['foo', 'bar']); //<= array of node.type(s)
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```
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### [.isType](index.js#L249)
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Return true if the node is the given `type`.
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**Params**
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* `type` **{String}**
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* `returns` **{Boolean}**
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**Example**
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```js
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var node = new Node({type: 'bar'});
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cosole.log(node.isType('foo')); // false
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cosole.log(node.isType(/^(foo|bar)$/)); // true
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cosole.log(node.isType(['foo', 'bar'])); // true
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```
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### [.hasType](index.js#L270)
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Return true if the `node.nodes` has the given `type`.
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**Params**
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* `type` **{String}**
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* `returns` **{Boolean}**
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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foo.push(bar);
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cosole.log(foo.hasType('qux')); // false
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cosole.log(foo.hasType(/^(qux|bar)$/)); // true
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cosole.log(foo.hasType(['qux', 'bar'])); // true
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```
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* `returns` **{Array}**
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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var baz = new Node({type: 'baz'});
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foo.push(bar);
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foo.push(baz);
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console.log(bar.siblings.length) // 2
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console.log(baz.siblings.length) // 2
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```
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* `returns` **{Number}**
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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var baz = new Node({type: 'baz'});
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var qux = new Node({type: 'qux'});
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foo.push(bar);
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foo.push(baz);
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foo.unshift(qux);
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console.log(bar.index) // 1
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console.log(baz.index) // 2
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console.log(qux.index) // 0
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```
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* `returns` **{Object}**
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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var baz = new Node({type: 'baz'});
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foo.push(bar);
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foo.push(baz);
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console.log(baz.prev.type) // 'bar'
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```
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* `returns` **{Object}**
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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var baz = new Node({type: 'baz'});
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foo.push(bar);
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foo.push(baz);
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console.log(bar.siblings.length) // 2
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console.log(baz.siblings.length) // 2
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```
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* `returns` **{Object}**: The first node, or undefiend
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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var baz = new Node({type: 'baz'});
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var qux = new Node({type: 'qux'});
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foo.push(bar);
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foo.push(baz);
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foo.push(qux);
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console.log(foo.first.type) // 'bar'
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```
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* `returns` **{Object}**: The last node, or undefiend
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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var baz = new Node({type: 'baz'});
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var qux = new Node({type: 'qux'});
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foo.push(bar);
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foo.push(baz);
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foo.push(qux);
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console.log(foo.last.type) // 'qux'
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```
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* `returns` **{Object}**: The last node, or undefiend
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**Example**
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```js
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var foo = new Node({type: 'foo'});
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var bar = new Node({type: 'bar'});
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var baz = new Node({type: 'baz'});
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var qux = new Node({type: 'qux'});
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foo.push(bar);
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foo.push(baz);
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foo.push(qux);
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console.log(foo.last.type) // 'qux'
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```
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## Release history
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Changelog entries are classified using the following labels from [keep-a-changelog](https://github.com/olivierlacan/keep-a-changelog):
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* `added`: for new features
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* `changed`: for changes in existing functionality
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* `deprecated`: for once-stable features removed in upcoming releases
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* `removed`: for deprecated features removed in this release
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* `fixed`: for any bug fixes
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Custom labels used in this changelog:
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* `dependencies`: bumps dependencies
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* `housekeeping`: code re-organization, minor edits, or other changes that don't fit in one of the other categories.
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### [2.0.0] - 2017-05-01
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**Changed**
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* `.unshiftNode` was renamed to [.unshift](#unshift)
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* `.pushNode` was renamed to [.push](#push)
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* `.getNode` was renamed to [.find](#find)
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**Added**
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* [.isNode](#isNode)
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* [.isEmpty](#isEmpty)
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* [.pop](#pop)
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* [.shift](#shift)
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* [.remove](#remove)
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### [0.1.0]
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First release.
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## About
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### Related projects
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* [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.")
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* [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.")
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* [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.")
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* [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.")
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* [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.")
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### Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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Please read the [contributing guide](.github/contributing.md) for advice on opening issues, pull requests, and coding standards.
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### Building docs
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_(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.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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### Running tests
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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:
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```sh
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$ npm install && npm test
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```
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### Author
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**Jon Schlinkert**
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* [github/jonschlinkert](https://github.com/jonschlinkert)
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* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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### License
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Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on June 25, 2017._ |