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snapdragon-util

LICENSE
README.md
index.js
node_modules/
package.json

README.md

snapdragon-util ![NPM version](https://www.npmjs.com/package/snapdragon-util) ![NPM monthly downloads](https://npmjs.org/package/snapdragon-util) ![NPM total downloads](https://npmjs.org/package/snapdragon-util) ![Linux Build Status](https://travis-ci.org/jonschlinkert/snapdragon-util)

Utilities for the snapdragon parser/compiler.

<details> <summary><strong>Table of Contents</strong></summary>

  • [Install](#install)
  • [Usage](#usage)
  • [API](#api)
  • [Release history](#release-history)
    • [[3.0.0] - 2017-05-01](#300---2017-05-01)
    • 0.1.0(#010)
  • [About](#about)

</details>

Install

Install with npm:

sh
$ npm install --save snapdragon-util

Install with yarn:

sh
$ yarn add snapdragon-util

Usage

js
var util = require('snapdragon-util');

API

[.isNode](index.js#L21)

Returns true if the given value is a node.

Params

Example

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

[.noop](index.js#L37)

Emit an empty string for the given node.

Params

Example

js
// do nothing for beginning-of-string
snapdragon.compiler.set('bos', utils.noop);

[.identity](index.js#L53)

Appdend node.val to compiler.output, exactly as it was created by the parser.

Params

Example

js
snapdragon.compiler.set('text', utils.identity);

[.append](index.js#L76)

Previously named .emit, this method appends the given val to compiler.output for the given node. Useful when you know what value should be appended advance, regardless of the actual value of node.val.

Params

  • node {Object}: Instance of snapdragon-node
  • returns {Function}: Returns a compiler middleware function.

Example

js
snapdragon.compiler
  .set('i', function(node) {
    this.mapVisit(node);
  })
  .set('i.open', utils.append('<i>'))
  .set('i.close', utils.append('</i>'))

[.toNoop](index.js#L99)

Used in compiler middleware, this onverts an AST node into an empty text node and deletes node.nodes if it exists. The advantage of this method is that, as opposed to completely removing the node, indices will not need to be re-calculated in sibling nodes, and nothing is appended to the output.

Params

  • node {Object}: Instance of snapdragon-node
  • nodes {Array}: Optionally pass a new nodes value, to replace the existing node.nodes array.

Example

js
utils.toNoop(node);
// convert `node.nodes` to the given value instead of deleting it
utils.toNoop(node, []);

[.visit](index.js#L128)

Visit node with the given fn. The built-in .visit method in snapdragon automatically calls registered compilers, this allows you to pass a visitor function.

Params

  • node {Object}: Instance of snapdragon-node
  • fn {Function}
  • returns {Object}: returns the node after recursively visiting all child nodes.

Example

js
snapdragon.compiler.set('i', function(node) {
  utils.visit(node, function(childNode) {
    // do stuff with "childNode"
    return childNode;
  });
});

[.mapVisit](index.js#L155)

Map [visit](#visit) the given fn over node.nodes. This is called by [visit](#visit), use this method if you do not want fn to be called on the first node.

Params

  • node {Object}: Instance of snapdragon-node
  • options {Object}
  • fn {Function}
  • returns {Object}: returns the node

Example

js
snapdragon.compiler.set('i', function(node) {
  utils.mapVisit(node, function(childNode) {
    // do stuff with "childNode"
    return childNode;
  });
});

[.addOpen](index.js#L194)

Unshift an *.open node onto node.nodes.

Params

  • node {Object}: Instance of snapdragon-node
  • Node {Function}: (required) Node constructor function from snapdragon-node.
  • filter {Function}: Optionaly specify a filter function to exclude the node.
  • returns {Object}: Returns the created opening node.

Example

js
var Node = require('snapdragon-node');
snapdragon.parser.set('brace', function(node) {
  var match = this.match(/^{/);
  if (match) {
    var parent = new Node({type: 'brace'});
    utils.addOpen(parent, Node);
    console.log(parent.nodes[0]):
    // { type: 'brace.open', val: '' };

    // push the parent "brace" node onto the stack
    this.push(parent);

    // return the parent node, so it's also added to the AST
    return brace;
  }
});

[.addClose](index.js#L244)

Push a *.close node onto node.nodes.

Params

  • node {Object}: Instance of snapdragon-node
  • Node {Function}: (required) Node constructor function from snapdragon-node.
  • filter {Function}: Optionaly specify a filter function to exclude the node.
  • returns {Object}: Returns the created closing node.

Example

js
var Node = require('snapdragon-node');
snapdragon.parser.set('brace', function(node) {
  var match = this.match(/^}/);
  if (match) {
    var parent = this.parent();
    if (parent.type !== 'brace') {
      throw new Error('missing opening: ' + '}');
    }

    utils.addClose(parent, Node);
    console.log(parent.nodes[parent.nodes.length - 1]):
    // { type: 'brace.close', val: '' };

    // no need to return a node, since the parent
    // was already added to the AST
    return;
  }
});

[.wrapNodes](index.js#L274)

Wraps the given node with *.open and *.close nodes.

Params

  • node {Object}: Instance of snapdragon-node
  • Node {Function}: (required) Node constructor function from snapdragon-node.
  • filter {Function}: Optionaly specify a filter function to exclude the node.
  • returns {Object}: Returns the node

[.pushNode](index.js#L299)

Push the given node onto parent.nodes, and set parent as `node.parent.

Params

  • parent {Object}
  • node {Object}: Instance of snapdragon-node
  • returns {Object}: Returns the child node

Example

js
var parent = new Node({type: 'foo'});
var node = new Node({type: 'bar'});
utils.pushNode(parent, node);
console.log(parent.nodes[0].type) // 'bar'
console.log(node.parent.type) // 'foo'

[.unshiftNode](index.js#L325)

Unshift node onto parent.nodes, and set parent as `node.parent.

Params

  • parent {Object}
  • node {Object}: Instance of snapdragon-node
  • returns {undefined}

Example

js
var parent = new Node({type: 'foo'});
var node = new Node({type: 'bar'});
utils.unshiftNode(parent, node);
console.log(parent.nodes[0].type) // 'bar'
console.log(node.parent.type) // 'foo'

[.popNode](index.js#L354)

Pop the last node off of parent.nodes. The advantage of using this method is that it checks for node.nodes and works with any version of snapdragon-node.

Params

  • parent {Object}
  • node {Object}: Instance of snapdragon-node
  • returns {Number|Undefined}: Returns the length of node.nodes or undefined.

Example

js
var parent = new Node({type: 'foo'});
utils.pushNode(parent, new Node({type: 'foo'}));
utils.pushNode(parent, new Node({type: 'bar'}));
utils.pushNode(parent, new Node({type: 'baz'}));
console.log(parent.nodes.length); //=> 3
utils.popNode(parent);
console.log(parent.nodes.length); //=> 2

[.shiftNode](index.js#L382)

Shift the first node off of parent.nodes. The advantage of using this method is that it checks for node.nodes and works with any version of snapdragon-node.

Params

  • parent {Object}
  • node {Object}: Instance of snapdragon-node
  • returns {Number|Undefined}: Returns the length of node.nodes or undefined.

Example

js
var parent = new Node({type: 'foo'});
utils.pushNode(parent, new Node({type: 'foo'}));
utils.pushNode(parent, new Node({type: 'bar'}));
utils.pushNode(parent, new Node({type: 'baz'}));
console.log(parent.nodes.length); //=> 3
utils.shiftNode(parent);
console.log(parent.nodes.length); //=> 2

[.removeNode](index.js#L409)

Remove the specified node from parent.nodes.

Params

  • parent {Object}
  • node {Object}: Instance of snapdragon-node
  • returns {Object|undefined}: Returns the removed node, if successful, or undefined if it does not exist on parent.nodes.

Example

js
var parent = new Node({type: 'abc'});
var foo = new Node({type: 'foo'});
utils.pushNode(parent, foo);
utils.pushNode(parent, new Node({type: 'bar'}));
utils.pushNode(parent, new Node({type: 'baz'}));
console.log(parent.nodes.length); //=> 3
utils.removeNode(parent, foo);
console.log(parent.nodes.length); //=> 2

[.isType](index.js#L443)

Returns true if node.type matches the given type. Throws a TypeError if node is not an instance of Node.

Params

  • node {Object}: Instance of snapdragon-node
  • type {String}
  • returns {Boolean}

Example

js
var Node = require('snapdragon-node');
var node = new Node({type: 'foo'});
console.log(utils.isType(node, 'foo')); // false
console.log(utils.isType(node, 'bar')); // true

[.hasType](index.js#L486)

Returns true if the given node has the given type in node.nodes. Throws a TypeError if node is not an instance of Node.

Params

  • node {Object}: Instance of snapdragon-node
  • type {String}
  • returns {Boolean}

Example

js
var Node = require('snapdragon-node');
var node = new Node({
  type: 'foo',
  nodes: [
    new Node({type: 'bar'}),
    new Node({type: 'baz'})
  ]
});
console.log(utils.hasType(node, 'xyz')); // false
console.log(utils.hasType(node, 'baz')); // true

[.firstOfType](index.js#L519)

Returns the first node from node.nodes of the given type

Params

  • nodes {Array}
  • type {String}
  • returns {Object|undefined}: Returns the first matching node or undefined.

Example

js
var node = new Node({
  type: 'foo',
  nodes: [
    new Node({type: 'text', val: 'abc'}),
    new Node({type: 'text', val: 'xyz'})
  ]
});

var textNode = utils.firstOfType(node.nodes, 'text');
console.log(textNode.val);
//=> 'abc'

[.findNode](index.js#L556)

Returns the node at the specified index, or the first node of the given type from node.nodes.

Params

  • nodes {Array}
  • type {String|Number}: Node type or index.
  • returns {Object}: Returns a node or undefined.

Example

js
var node = new Node({
  type: 'foo',
  nodes: [
    new Node({type: 'text', val: 'abc'}),
    new Node({type: 'text', val: 'xyz'})
  ]
});

var nodeOne = utils.findNode(node.nodes, 'text');
console.log(nodeOne.val);
//=> 'abc'

var nodeTwo = utils.findNode(node.nodes, 1);
console.log(nodeTwo.val);
//=> 'xyz'

[.isOpen](index.js#L584)

Returns true if the given node is an "*.open" node.

Params

Example

js
var Node = require('snapdragon-node');
var brace = new Node({type: 'brace'});
var open = new Node({type: 'brace.open'});
var close = new Node({type: 'brace.close'});

console.log(utils.isOpen(brace)); // false
console.log(utils.isOpen(open)); // true
console.log(utils.isOpen(close)); // false

[.isClose](index.js#L607)

Returns true if the given node is a "*.close" node.

Params

Example

js
var Node = require('snapdragon-node');
var brace = new Node({type: 'brace'});
var open = new Node({type: 'brace.open'});
var close = new Node({type: 'brace.close'});

console.log(utils.isClose(brace)); // false
console.log(utils.isClose(open)); // false
console.log(utils.isClose(close)); // true

[.hasOpen](index.js#L633)

Returns true if node.nodes has an .open node

Params

Example

js
var Node = require('snapdragon-node');
var brace = new Node({
  type: 'brace',
  nodes: []
});

var open = new Node({type: 'brace.open'});
console.log(utils.hasOpen(brace)); // false

brace.pushNode(open);
console.log(utils.hasOpen(brace)); // true

[.hasClose](index.js#L663)

Returns true if node.nodes has a .close node

Params

Example

js
var Node = require('snapdragon-node');
var brace = new Node({
  type: 'brace',
  nodes: []
});

var close = new Node({type: 'brace.close'});
console.log(utils.hasClose(brace)); // false

brace.pushNode(close);
console.log(utils.hasClose(brace)); // true

[.hasOpenAndClose](index.js#L697)

Returns true if node.nodes has both .open and .close nodes

Params

Example

js
var Node = require('snapdragon-node');
var brace = new Node({
  type: 'brace',
  nodes: []
});

var open = new Node({type: 'brace.open'});
var close = new Node({type: 'brace.close'});
console.log(utils.hasOpen(brace)); // false
console.log(utils.hasClose(brace)); // false

brace.pushNode(open);
brace.pushNode(close);
console.log(utils.hasOpen(brace)); // true
console.log(utils.hasClose(brace)); // true

[.addType](index.js#L719)

Push the given node onto the state.inside array for the given type. This array is used as a specialized "stack" for only the given node.type.

Params

  • state {Object}: The compiler.state object or custom state object.
  • node {Object}: Instance of snapdragon-node
  • returns {Array}: Returns the state.inside stack for the given type.

Example

js
var state = { inside: {}};
var node = new Node({type: 'brace'});
utils.addType(state, node);
console.log(state.inside);
//=> { brace: [{type: 'brace'}] }

[.removeType](index.js#L759)

Remove the given node from the state.inside array for the given type. This array is used as a specialized "stack" for only the given node.type.

Params

  • state {Object}: The compiler.state object or custom state object.
  • node {Object}: Instance of snapdragon-node
  • returns {Array}: Returns the state.inside stack for the given type.

Example

js
var state = { inside: {}};
var node = new Node({type: 'brace'});
utils.addType(state, node);
console.log(state.inside);
//=> { brace: [{type: 'brace'}] }
utils.removeType(state, node);
//=> { brace: [] }

[.isEmpty](index.js#L788)

Returns true if node.val is an empty string, or node.nodes does not contain any non-empty text nodes.

Params

  • node {Object}: Instance of snapdragon-node
  • fn {Function}
  • returns {Boolean}

Example

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

[.isInsideType](index.js#L833)

Returns true if the state.inside stack for the given type exists and has one or more nodes on it.

Params

  • state {Object}
  • type {String}
  • returns {Boolean}

Example

js
var state = { inside: {}};
var node = new Node({type: 'brace'});
console.log(utils.isInsideType(state, 'brace')); //=> false
utils.addType(state, node);
console.log(utils.isInsideType(state, 'brace')); //=> true
utils.removeType(state, node);
console.log(utils.isInsideType(state, 'brace')); //=> false

[.isInside](index.js#L867)

Returns true if node is either a child or grand-child of the given type, or state.inside[type] is a non-empty array.

Params

  • state {Object}: Either the compiler.state object, if it exists, or a user-supplied state object.
  • node {Object}: Instance of snapdragon-node
  • type {String}: The node.type to check for.
  • returns {Boolean}

Example

js
var state = { inside: {}};
var node = new Node({type: 'brace'});
var open = new Node({type: 'brace.open'});
console.log(utils.isInside(state, open, 'brace')); //=> false
utils.pushNode(node, open);
console.log(utils.isInside(state, open, 'brace')); //=> true

[.last](index.js#L915)

Get the last n element from the given array. Used for getting a node from node.nodes.

Params

  • array {Array}
  • n {Number}
  • returns {undefined}

[.arrayify](index.js#L935)

Cast the given val to an array.

Params

  • val {any}
  • returns {Array}

Example

js
console.log(utils.arraify(''));
//=> []
console.log(utils.arraify('foo'));
//=> ['foo']
console.log(utils.arraify(['foo']));
//=> ['foo']

[.stringify](index.js#L948)

Convert the given val to a string by joining with ,. Useful for creating a cheerio/CSS/DOM-style selector from a list of strings.

Params

  • val {any}
  • returns {Array}

[.trim](index.js#L961)

Ensure that the given value is a string and call .trim() on it, or return an empty string.

Params

  • str {String}
  • returns {String}

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.

[3.0.0] - 2017-05-01

Changed

  • .emit was renamed to [.append](#append)
  • .addNode was renamed to [.pushNode](#pushNode)
  • .getNode was renamed to [.findNode](#findNode)
  • .isEmptyNodes was renamed to [.isEmpty](#isEmpty): also now works with node.nodes and/or node.val

Added

  • [.identity](#identity)
  • [.removeNode](#removeNode)
  • [.shiftNode](#shiftNode)
  • [.popNode](#popNode)

[0.1.0]

First release.

About

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, 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

License

Copyright © 2017, Jon Schlinkert. Released under the [MIT License](LICENSE).

_This file was generated by verb-generate-readme, v0.6.0, on May 01, 2017._

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