source: trip-planner-front/node_modules/postcss-media-minmax/README.md

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1# PostCSS Media Minmax
2
3[![CSS Standard Status](https://cssdb.org/badge/media-query-ranges.svg)](https://cssdb.org/#media-query-ranges)
4[![Build Status](https://travis-ci.org/postcss/postcss-media-minmax.svg?branch=master)](https://travis-ci.org/postcss/postcss-media-minmax)
5[![NPM Downloads](https://img.shields.io/npm/dm/postcss-media-minmax.svg?style=flat)](https://www.npmjs.com/package/postcss-media-minmax)
6[![NPM Version](https://img.shields.io/npm/v/postcss-media-minmax.svg?style=flat)](https://www.npmjs.com/package/postcss-media-minmax)
7[![License](https://img.shields.io/npm/l/postcss-media-minmax.svg?style=flat)](https://opensource.org/licenses/MIT)
8
9> Writing simple and graceful media queries!
10
11The `min-width`, `max-width` and many other properties of media queries are really confusing. I want to cry every time I see them. But right now according to the new specs, you can use more intuitive `<=` or `>=` to replace the `min-`/`max-` prefixes in media queries.
12
13V2.1.0 began to support `>` or `<` symbol.
14
15This is a polyfill plugin which supports [CSS Media Queries Level 4](https://drafts.csswg.org/mediaqueries/#mq-range-context) and gives you access to the new features right away. Mom will never worry about my study any more. So amazing!
16
17
18[简体中文](README-zh.md)
19
20-----
21
22![Gif Demo](https://gtms02.alicdn.com/tps/i2/TB1UIjyGVXXXXcCaXXXx274FpXX-877-339.gif)
23
24
25## Installation
26
27 $ npm install postcss-media-minmax
28
29## Quick Start
30
31Example 1:
32
33```js
34var fs = require('fs')
35var postcss = require('postcss')
36var minmax = require('postcss-media-minmax')
37
38var css = fs.readFileSync('input.css', 'utf8')
39
40var output = postcss()
41 .use(minmax())
42 .process(css)
43 .css
44
45console.log('\n====>Output CSS:\n', output)
46```
47
48Or just:
49
50```js
51var output = postcss(minmax())
52 .process(css)
53 .css
54```
55
56input.css:
57
58```css
59@media screen and (width >= 500px) and (width <= 1200px) {
60 .bar {
61 display: block;
62 }
63}
64```
65
66You will get:
67
68```css
69@media screen and (min-width: 500px) and (max-width: 1200px) {
70 .bar {
71 display: block;
72 }
73}
74```
75
76## CSS syntax
77
78### [Syntax](https://drafts.csswg.org/mediaqueries/#mq-range-context)
79
80```
81<mf-range> = <mf-name> [ '<' | '>' ]? '='? <mf-value>
82 | <mf-value> [ '<' | '>' ]? '='? <mf-name>
83 | <mf-value> '<' '='? <mf-name> '<' '='? <mf-value>
84 | <mf-value> '>' '='? <mf-name> '>' '='? <mf-value>
85```
86
87![syntax](https://gtms03.alicdn.com/tps/i3/TB1Rje0HXXXXXXeXpXXccZJ0FXX-640-290.png)
88
89PostCSS Media Minmax hasn't implemented syntax such as `200px > = width` or `200px < = width` currently because its readability is not good enough yet.
90
91## [Values](https://drafts.csswg.org/mediaqueries/#values)
92
93**The special values:**
94
95* [<ratio>](https://drafts.csswg.org/mediaqueries/#typedef-ratio)
96
97 The <ratio> value type is a positive (not zero or negative) <integer> followed by optional whitespace, followed by a solidus ('/'), followed by optional whitespace, followed by a positive <integer>. <ratio>s can be ordered or compared by transforming them into the number obtained by dividing their first <integer> by their second <integer>.
98
99 ```css
100 @media screen and (device-aspect-ratio: 16 / 9) {
101 /* rules */
102 }
103
104 /* equivalent to */
105 @media screen and (device-aspect-ratio: 16/9) {
106 /* rules */
107 }
108 ```
109
110* [<mq-boolean>](https://drafts.csswg.org/mediaqueries/#typedef-mq-boolean)
111
112 The <mq-boolean> value type is an <integer> with the value 0 or 1. Any other integer value is invalid. Note that -0 is always equivalent to 0 in CSS, and so is also accepted as a valid <mq-boolean> value.
113
114 ```css
115 @media screen and (grid: -0) {
116 /* rules */
117 }
118
119 /* equivalent to */
120 @media screen and (grid: 0) {
121 /* rules */
122 }
123 ```
124
125## How to use
126
127### Shorthand
128
129In Example 1, if a feature has both `>=` and `<=` logic, it can be written as follows:
130
131```css
132@media screen and (500px <= width <= 1200px) {
133 .bar {
134 display: block;
135 }
136}
137/* Or */
138@media screen and (1200px >= width >= 500px) {
139 .bar {
140 display: block;
141 }
142}
143```
144
145Which will output:
146
147```css
148@media screen and (min-width: 500px) and (max-width: 1200px) {
149 .bar {
150 display: block;
151 }
152}
153```
154
155**Note**: When the media feature name is in the middle, we must ensure that two `<=` or `>=` are in the same direction, otherwise which will not be converted.
156
157E.g. in the example below, `width` is greater than or equal to 500px and is greater than or equal to 1200px, which is the wrong in both grammar and logic.
158
159
160```css
161@media screen and (1200px <= width >= 500px) {
162 .bar {
163 display: block;
164 }
165}
166```
167
168### Media feature names
169
170The following properties support the `min-`/`max-` prefixes in the specifications at present, and will be automatically converted by PostCSS Media Minmax.
171
172* `width`
173* `height`
174* `device-width`
175* `device-height`
176* `aspect-ratio`
177* `device-aspect-ratio`
178* `color`
179* `color-index`
180* `monochrome`
181* `resolution`
182
183
184
185### Using with `@custom-media` & Node Watch
186
187```js
188var fs = require('fs')
189var chokidar = require('chokidar')
190var postcss = require('postcss')
191var minmax = require('postcss-media-minmax')
192var customMedia = require('postcss-custom-media')
193
194var src = 'input.css'
195
196console.info('Watching…\nModify the input.css and save.')
197
198
199chokidar.watch(src, {
200 ignored: /[\/\\]\./,
201 persistent: true
202}).on('all',
203 function(event, path, stats) {
204 var css = fs.readFileSync(src, 'utf8')
205 var output = postcss()
206 .use(customMedia())
207 .use(minmax())
208 .process(css)
209 .css;
210 fs.writeFileSync('output.css', output)
211 })
212
213```
214
215
216input.css:
217
218```css
219@custom-media --foo (width >= 20em) and (width <= 50em);
220@custom-media --bar (height >= 300px) and (height <= 600px);
221
222@media (--foo) and (--bar) {
223
224}
225```
226
227output.css:
228
229```css
230@media (min-width: 20em) and (max-width: 50em) and (min-height: 300px) and (max-height: 600px) {
231
232}
233```
234
235### Grunt
236
237```js
238module.exports = function(grunt) {
239 grunt.initConfig({
240 pkg: grunt.file.readJSON('package.json'),
241 postcss: {
242 options: {
243 processors: [
244 require('autoprefixer-core')({ browsers: ['> 0%'] }).postcss, //Other plugin
245 require('postcss-media-minmax')(),
246 ]
247 },
248 dist: {
249 src: ['src/*.css'],
250 dest: 'build/grunt.css'
251 }
252 }
253 });
254
255 grunt.loadNpmTasks('grunt-contrib-uglify');
256 grunt.loadNpmTasks('grunt-postcss');
257
258 grunt.registerTask('default', ['postcss']);
259}
260```
261
262### Gulp
263
264```js
265var gulp = require('gulp');
266var rename = require('gulp-rename');
267var postcss = require('gulp-postcss');
268var selector = require('postcss-media-minmax')
269var autoprefixer = require('autoprefixer-core')
270
271gulp.task('default', function () {
272 var processors = [
273 autoprefixer({ browsers: ['> 0%'] }), //Other plugin
274 minmax()
275 ];
276 gulp.src('src/*.css')
277 .pipe(postcss(processors))
278 .pipe(rename('gulp.css'))
279 .pipe(gulp.dest('build'))
280});
281gulp.watch('src/*.css', ['default']);
282```
283
284
285## Contributing
286
287* Install all the dependent modules.
288* Respect the coding style (Use [EditorConfig](https://editorconfig.org/)).
289* Add test cases in the [test](test) directory.
290* Run the test cases.
291
292```
293$ git clone https://github.com/postcss/postcss-media-minmaxs.git
294$ git checkout -b patch
295$ npm install
296$ npm test
297```
298
299## Acknowledgements
300
301* Thank the author of PostCSS [Andrey Sitnik](https://github.com/ai) for giving us such simple and easy CSS syntax analysis tools.
302
303* Thank [Tab Atkins Jr.](https://www.xanthir.com/contact/) for writing the specs of Media Queries Level 4.
304
305* Thank [ziyunfei](https://weibo.com/p/1005051708684567) for suggestions and help of this plugin.
306
307
308## [Changelog](CHANGELOG.md)
309
310## [License](LICENSE)
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