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807 lines
No EOL
21 KiB
Markdown
# snapdragon-util [](https://www.npmjs.com/package/snapdragon-util) [](https://npmjs.org/package/snapdragon-util) [](https://npmjs.org/package/snapdragon-util) [](https://travis-ci.org/jonschlinkert/snapdragon-util)
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> Utilities for the snapdragon parser/compiler.
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<details>
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<summary><strong>Table of Contents</strong></summary>
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- [Install](#install)
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- [Usage](#usage)
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- [API](#api)
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- [Release history](#release-history)
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* [[3.0.0] - 2017-05-01](#300---2017-05-01)
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* [[0.1.0]](#010)
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- [About](#about)
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</details>
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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-util
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```
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Install with [yarn](https://yarnpkg.com):
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```sh
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$ yarn add snapdragon-util
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```
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## Usage
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```js
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var util = require('snapdragon-util');
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```
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## API
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### [.isNode](index.js#L21)
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Returns true if the given value is a node.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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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(utils.isNode(node)); //=> true
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console.log(utils.isNode({})); //=> false
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```
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### [.noop](index.js#L37)
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Emit an empty string for the given `node`.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{undefined}**
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**Example**
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```js
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// do nothing for beginning-of-string
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snapdragon.compiler.set('bos', utils.noop);
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```
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### [.identity](index.js#L53)
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Appdend `node.val` to `compiler.output`, exactly as it was created by the parser.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{undefined}**
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**Example**
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```js
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snapdragon.compiler.set('text', utils.identity);
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```
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### [.append](index.js#L76)
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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`.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{Function}**: Returns a compiler middleware function.
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**Example**
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```js
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snapdragon.compiler
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.set('i', function(node) {
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this.mapVisit(node);
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})
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.set('i.open', utils.append('<i>'))
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.set('i.close', utils.append('</i>'))
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```
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### [.toNoop](index.js#L99)
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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.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `nodes` **{Array}**: Optionally pass a new `nodes` value, to replace the existing `node.nodes` array.
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**Example**
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```js
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utils.toNoop(node);
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// convert `node.nodes` to the given value instead of deleting it
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utils.toNoop(node, []);
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```
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### [.visit](index.js#L128)
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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.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `fn` **{Function}**
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* `returns` **{Object}**: returns the node after recursively visiting all child nodes.
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**Example**
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```js
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snapdragon.compiler.set('i', function(node) {
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utils.visit(node, function(childNode) {
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// do stuff with "childNode"
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return childNode;
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});
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});
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```
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### [.mapVisit](index.js#L155)
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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.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `options` **{Object}**
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* `fn` **{Function}**
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* `returns` **{Object}**: returns the node
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**Example**
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```js
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snapdragon.compiler.set('i', function(node) {
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utils.mapVisit(node, function(childNode) {
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// do stuff with "childNode"
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return childNode;
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});
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});
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```
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### [.addOpen](index.js#L194)
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Unshift an `*.open` node onto `node.nodes`.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `Node` **{Function}**: (required) Node constructor function from [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node).
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* `filter` **{Function}**: Optionaly specify a filter function to exclude the node.
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* `returns` **{Object}**: Returns the created opening node.
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**Example**
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```js
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var Node = require('snapdragon-node');
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snapdragon.parser.set('brace', function(node) {
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var match = this.match(/^{/);
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if (match) {
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var parent = new Node({type: 'brace'});
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utils.addOpen(parent, Node);
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console.log(parent.nodes[0]):
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// { type: 'brace.open', val: '' };
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// push the parent "brace" node onto the stack
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this.push(parent);
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// return the parent node, so it's also added to the AST
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return brace;
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}
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});
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```
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### [.addClose](index.js#L244)
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Push a `*.close` node onto `node.nodes`.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `Node` **{Function}**: (required) Node constructor function from [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node).
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* `filter` **{Function}**: Optionaly specify a filter function to exclude the node.
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* `returns` **{Object}**: Returns the created closing node.
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**Example**
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```js
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var Node = require('snapdragon-node');
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snapdragon.parser.set('brace', function(node) {
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var match = this.match(/^}/);
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if (match) {
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var parent = this.parent();
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if (parent.type !== 'brace') {
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throw new Error('missing opening: ' + '}');
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}
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utils.addClose(parent, Node);
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console.log(parent.nodes[parent.nodes.length - 1]):
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// { type: 'brace.close', val: '' };
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// no need to return a node, since the parent
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// was already added to the AST
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return;
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}
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});
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```
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### [.wrapNodes](index.js#L274)
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Wraps the given `node` with `*.open` and `*.close` nodes.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `Node` **{Function}**: (required) Node constructor function from [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node).
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* `filter` **{Function}**: Optionaly specify a filter function to exclude the node.
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* `returns` **{Object}**: Returns the node
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### [.pushNode](index.js#L299)
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Push the given `node` onto `parent.nodes`, and set `parent` as `node.parent.
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**Params**
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* `parent` **{Object}**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{Object}**: Returns the child node
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**Example**
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```js
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var parent = new Node({type: 'foo'});
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var node = new Node({type: 'bar'});
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utils.pushNode(parent, node);
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console.log(parent.nodes[0].type) // 'bar'
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console.log(node.parent.type) // 'foo'
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```
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### [.unshiftNode](index.js#L325)
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Unshift `node` onto `parent.nodes`, and set `parent` as `node.parent.
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**Params**
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* `parent` **{Object}**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{undefined}**
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**Example**
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```js
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var parent = new Node({type: 'foo'});
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var node = new Node({type: 'bar'});
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utils.unshiftNode(parent, node);
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console.log(parent.nodes[0].type) // 'bar'
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console.log(node.parent.type) // 'foo'
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```
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### [.popNode](index.js#L354)
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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`.
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**Params**
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* `parent` **{Object}**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{Number|Undefined}**: Returns the length of `node.nodes` or undefined.
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**Example**
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```js
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var parent = new Node({type: 'foo'});
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utils.pushNode(parent, new Node({type: 'foo'}));
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utils.pushNode(parent, new Node({type: 'bar'}));
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utils.pushNode(parent, new Node({type: 'baz'}));
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console.log(parent.nodes.length); //=> 3
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utils.popNode(parent);
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console.log(parent.nodes.length); //=> 2
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```
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### [.shiftNode](index.js#L382)
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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`.
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**Params**
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* `parent` **{Object}**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{Number|Undefined}**: Returns the length of `node.nodes` or undefined.
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**Example**
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```js
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var parent = new Node({type: 'foo'});
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utils.pushNode(parent, new Node({type: 'foo'}));
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utils.pushNode(parent, new Node({type: 'bar'}));
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utils.pushNode(parent, new Node({type: 'baz'}));
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console.log(parent.nodes.length); //=> 3
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utils.shiftNode(parent);
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console.log(parent.nodes.length); //=> 2
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```
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### [.removeNode](index.js#L409)
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Remove the specified `node` from `parent.nodes`.
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**Params**
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* `parent` **{Object}**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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* `returns` **{Object|undefined}**: Returns the removed node, if successful, or undefined if it does not exist on `parent.nodes`.
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**Example**
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```js
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var parent = new Node({type: 'abc'});
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var foo = new Node({type: 'foo'});
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utils.pushNode(parent, foo);
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utils.pushNode(parent, new Node({type: 'bar'}));
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utils.pushNode(parent, new Node({type: 'baz'}));
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console.log(parent.nodes.length); //=> 3
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utils.removeNode(parent, foo);
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console.log(parent.nodes.length); //=> 2
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```
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### [.isType](index.js#L443)
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Returns true if `node.type` matches the given `type`. Throws a `TypeError` if `node` is not an instance of `Node`.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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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 = require('snapdragon-node');
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var node = new Node({type: 'foo'});
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console.log(utils.isType(node, 'foo')); // false
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console.log(utils.isType(node, 'bar')); // true
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```
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### [.hasType](index.js#L486)
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Returns true if the given `node` has the given `type` in `node.nodes`. Throws a `TypeError` if `node` is not an instance of `Node`.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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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 = require('snapdragon-node');
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var node = new Node({
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type: 'foo',
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nodes: [
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new Node({type: 'bar'}),
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new Node({type: 'baz'})
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]
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});
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console.log(utils.hasType(node, 'xyz')); // false
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console.log(utils.hasType(node, 'baz')); // true
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```
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### [.firstOfType](index.js#L519)
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Returns the first node from `node.nodes` of the given `type`
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**Params**
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* `nodes` **{Array}**
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* `type` **{String}**
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* `returns` **{Object|undefined}**: Returns the first matching node or undefined.
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**Example**
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```js
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var node = new Node({
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type: 'foo',
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nodes: [
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new Node({type: 'text', val: 'abc'}),
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new Node({type: 'text', val: 'xyz'})
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]
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});
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var textNode = utils.firstOfType(node.nodes, 'text');
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console.log(textNode.val);
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//=> 'abc'
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```
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### [.findNode](index.js#L556)
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Returns the node at the specified index, or the first node of the given `type` from `node.nodes`.
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**Params**
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* `nodes` **{Array}**
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* `type` **{String|Number}**: Node type or index.
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* `returns` **{Object}**: Returns a node or undefined.
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**Example**
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```js
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var node = new Node({
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type: 'foo',
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nodes: [
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new Node({type: 'text', val: 'abc'}),
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new Node({type: 'text', val: 'xyz'})
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]
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});
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var nodeOne = utils.findNode(node.nodes, 'text');
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console.log(nodeOne.val);
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//=> 'abc'
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var nodeTwo = utils.findNode(node.nodes, 1);
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console.log(nodeTwo.val);
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//=> 'xyz'
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```
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### [.isOpen](index.js#L584)
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Returns true if the given node is an "*.open" node.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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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 brace = new Node({type: 'brace'});
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var open = new Node({type: 'brace.open'});
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var close = new Node({type: 'brace.close'});
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console.log(utils.isOpen(brace)); // false
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console.log(utils.isOpen(open)); // true
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console.log(utils.isOpen(close)); // false
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```
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### [.isClose](index.js#L607)
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Returns true if the given node is a "*.close" node.
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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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 brace = new Node({type: 'brace'});
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var open = new Node({type: 'brace.open'});
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var close = new Node({type: 'brace.close'});
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console.log(utils.isClose(brace)); // false
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console.log(utils.isClose(open)); // false
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console.log(utils.isClose(close)); // true
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```
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### [.hasOpen](index.js#L633)
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Returns true if `node.nodes` **has** an `.open` node
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**Params**
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* `node` **{Object}**: Instance of [snapdragon-node](https://github.com/jonschlinkert/snapdragon-node)
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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 brace = new Node({
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type: 'brace',
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nodes: []
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});
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var open = new Node({type: 'brace.open'});
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console.log(utils.hasOpen(brace)); // false
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brace.pushNode(open);
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console.log(utils.hasOpen(brace)); // true
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```
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### [.hasClose](index.js#L663)
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Returns true if `node.nodes` **has** a `.close` node
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|
|
**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._ |