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# postcss-quantity-queries
[![npm version][npm-image]][npm-url]
[![Build Status][travis-image]][travis-url]
[![Coverage Status][coveralls-image]][coveralls-url]
> [PostCSS] plugin enabling quantity-queries.
This plugin is derived from the Sass [Quantity Queries mixins] by Daniel Guillan.
For informations about quantity queries check those resources:
[Quantity Queries for CSS][]
[Styling elements based on sibling count][]
[Daniel’s demo on CodePen][]
## Installation
```
npm install postcss-quantity-queries --save-dev
```
## Usage
```js
const fs = require('fs');
const postcss = require('postcss');
const quantityQueries = require('postcss-quantity-queries');
const input = fs.readFileSync('input.css', 'utf8');
postcss()
.use(quantityQueries)
.process(input)
.then(result => {
fs.writeFileSync('output.css', result.css);
});
```
## API
### at-least
Target `count` items or more:
```css
:at-least(count) { ... }
```
input:
```css
ul > li:at-least(4) {
color: rebeccapurple;
}
```
output:
```css
ul > li:nth-last-child(n+4),
ul > li:nth-last-child(n+4) ~ li {
color: rebeccapurple;
}
```
### at-most
Target `count` items or less:
```css
:at-most(count) { ... }
```
input:
```css
ul > li:at-most(4) {
color: rebeccapurple;
}
```
output:
```css
ul > li:nth-last-child(-n+4):first-child,
ul > li:nth-last-child(-n+4):first-child ~ li {
color: rebeccapurple;
}
```
### between
Target a range of items between `start` and `end`:
```css
:between(start, end) { ... }
```
input:
```css
ul > li:between(4, 6) {
color: rebeccapurple;
}
```
output:
```css
ul > li:nth-last-child(n+4):nth-last-child(-n+6):first-child,
ul > li:nth-last-child(n+4):nth-last-child(-n+6):first-child ~ li {
color: rebeccapurple;
}
```
### exactly
Target exactly `count` items:
```css
:exactly(count) { ... }
```
input:
```css
ul > li:exactly(4) {
color: rebeccapurple;
}
```
output:
```css
ul > li:nth-last-child(4):first-child,
ul > li:nth-last-child(4):first-child ~ li {
color: rebeccapurple;
}
```
### All pseudo-selector extensions
Selector | Description
---|---
[#](#at-least) `:at-least(count) { … }` | Target `count` items or more
[#](#at-most) `:at-most(count) { … }` | Target `count` items or less
[#](#between) `:between(start, end) { … }` | Target a range of items between `start` and `end`
[#](#exactly) `:exactly(count) { … }` | Target exactly `count` items
## At-rule API
There is also an at-rule API available, similar to pre-processors.
Although it might get deprecated at some point.
The recommended API is the pseudo-selectors one.
```css
@at-least count [, selector] { ... }
```
```css
@at-most count [, selector] { ... }
```
```css
@between start end [, selector] { ... }
```
```css
@exactly count [, selector] { ... }
```
```css
ul > li {
@at-least 4 span {
color: rebeccapurple;
}
}
ul > li {
@between 4 6 {
color: rebeccapurple;
}
}
```
Check out the [tests](test/fixture) for more examples.
## Credits
* [Pascal Duez](https://github.com/pascalduez)
## Licence
postcss-quantity-queries is [unlicensed](http://unlicense.org/).
[PostCSS]: https://github.com/postcss/postcss
[Quantity Queries mixins]: https://github.com/danielguillan/quantity-queries
[Quantity Queries for CSS]: http://alistapart.com/article/quantity-queries-for-css
[Styling elements based on sibling count]: http://lea.verou.me/2011/01/styling-children-based-on-their-number-with-css3
[Daniel’s demo on CodePen]: http://codepen.io/danielguillan/pen/GgBOxm
[npm-url]: https://www.npmjs.org/package/postcss-quantity-queries
[npm-image]: http://img.shields.io/npm/v/postcss-quantity-queries.svg?style=flat-square
[travis-url]: https://travis-ci.org/pascalduez/postcss-quantity-queries?branch=master
[travis-image]: http://img.shields.io/travis/pascalduez/postcss-quantity-queries.svg?style=flat-square
[coveralls-url]: https://coveralls.io/r/pascalduez/postcss-quantity-queries
[coveralls-image]: https://img.shields.io/coveralls/pascalduez/postcss-quantity-queries.svg?style=flat-square
[depstat-url]: https://david-dm.org/pascalduez/postcss-quantity-queries
[depstat-image]: https://david-dm.org/pascalduez/postcss-quantity-queries.svg?style=flat-square
[license-image]: http://img.shields.io/npm/l/postcss-quantity-queries.svg?style=flat-square
[license-url]: UNLICENSE
|
