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Table of Contents - [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)
## Install Install with [npm](https://www.npmjs.com/): ```sh $ npm install --save snapdragon-util ``` Install with [yarn](https://yarnpkg.com): ```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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{Boolean}** **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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{undefined}** **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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{undefined}** **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](https://github.com/jonschlinkert/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('')) .set('i.close', utils.append('')) ``` ### [.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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/snapdragon-node) * `Node` **{Function}**: (required) Node constructor function from [snapdragon-node](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/snapdragon-node) * `Node` **{Function}**: (required) Node constructor function from [snapdragon-node](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/snapdragon-node) * `Node` **{Function}**: (required) Node constructor function from [snapdragon-node](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{Boolean}** **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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{Boolean}** **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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{Boolean}** **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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{Boolean}** **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** * `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node) * `returns` **{Boolean}** **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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](https://github.com/jonschlinkert/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](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. ### [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](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 May 01, 2017._