postcss-pxtorpx-pro

本项目从pxtorem基础上修改而来，转换px单位为rpx，并允许指定任意单位及其转换函数，支持指定黑名单prop。

由于可以指定需要转换的单位和转化函数，故该插件理论上可以将px单位转为任意单位。默认转为rpx单位。

This repo is fork from pxtorem, but more powerful than it. This plugin can transform pixels unit to any unit theoretically, which default transform to rpx unit.

rpx is the unit make for developing mini-program, see @wxa

A plugin for PostCSS that generates rpx units from pixel units.

Install

$ npm install postcss-pxtorpx-pro --save-dev

Usage

像素是web开发中最常用的单位，但在做响应式页面开发之时稍显无力，开发者需要编写大量适配代码。故在移动端开发中我们常搭配rem, vw等单位使用，而在开发各类小程序中，我们又常用rpx取代vw。

Pixels are the easiest unit to use (opinion). The only issue with them is that they don't let browsers change the default font size of 16. This script converts every px value to a rem from the properties you choose to allow the browser to set the font size.

Input/Output

With the default settings, only font related properties are targeted.

// input
h1 {
    margin: 0 0 20px;
    font-size: 32px;
    line-height: 1.2;
    letter-spacing: 1px;
}

// output
h1 { 
  margin: 0 0 40rpx; 
  font-size: 64rpx; 
  line-height: 1.2; 
  letter-spacing: 2rpx; 
}

Example

var fs = require('fs');
var postcss = require('postcss');
var pxtorpx = require('postcss-pxtorpx-pro');
var css = fs.readFileSync('main.css', 'utf8');
var options = {
    replace: false
};
var processedCss = postcss(pxtorpx(options)).process(css).css;

fs.writeFile('main-rpx.css', processedCss, function (err) {
  if (err) {
    throw err;
  }
  console.log('Rpx file written.');
});

options

Type: Object | Null
Default:

{
  // 转化的单位
  unit: 'rpx',
  // 单位精度
  unitPrecision: 5,
  // 不需要处理的css选择器
  selectorBlackList: [],
  // 不需要转化的css属性
  propBlackList: [], 
  // 直接修改px，还是新加一条css规则
  replace: true,
  // 是否匹配媒介查询的px
  mediaQuery: false,
  // 需要转化的最小的pixel值，低于该值的px单位不做转化
  minPixelValue: 0,
  // 不处理的文件
  exclude: null,
  // 转化函数
  // 默认设计稿按照750宽，2倍图的出
  transform: (x) => 2*x
}

unit(String) The unit transform to. default rpx.
unitPrecision (Number) The decimal numbers to allow the rpx units to grow to.
transform (Function) function to transform pixels to other unit. default (x) => 2 * x.
propBlackList (Array) The properties that can change from px to rpx.
- Values need to be exact matches.
- Use wildcard * to enable all properties. Example: ['*']
- Use * at the start or end of a word. (['*position*'] will match background-position-y)
- Use ! to not match a property. Example: ['*', '!letter-spacing']
- Combine the "not" prefix with the other prefixes. Example: ['*', '!font*']
selectorBlackList (Array) The selectors to ignore and leave as px.
- If value is string, it checks to see if selector contains the string.
  - ['body'] will match .body-class
- If value is regexp, it checks to see if the selector matches the regexp.
  - [/^body$/] will match body but not .body
replace (Boolean) Replaces rules containing rpxs instead of adding fallbacks.
mediaQuery (Boolean) Allow px to be converted in media queries.
minPixelValue (Number) Set the minimum pixel value to replace.
exclude (String, Regexp, Function) The file path to ignore and leave as px.
- If value is string, it checks to see if file path contains the string.
  - 'exclude' will match \project\postcss-pxtorpx\exclude\path
- If value is regexp, it checks to see if file path matches the regexp.
  - /exclude/i will match \project\postcss-pxtorpx\exclude\path
- If value is function, you can use exclude function to return a true and the file will be ignored.
  - the callback will pass the file path as a parameter, it should returns a Boolean result.
  - function (file) { return file.indexOf('exclude') !== -1; }

Use with gulp-postcss and autoprefixer

var gulp = require('gulp');
var postcss = require('gulp-postcss');
var autoprefixer = require('autoprefixer');
var pxtorpx = require('postcss-pxtorpx-pro');

gulp.task('css', function () {

    var processors = [
        autoprefixer({
            browsers: 'last 1 version'
        }),
        pxtorpx({
            replace: false
        })
    ];

    return gulp.src(['build/css/**/*.css'])
        .pipe(postcss(processors))
        .pipe(gulp.dest('build/css'));
});

A message about ignoring properties

Currently, the easiest way to have a single property ignored is to use a capital in the pixel unit declaration.

// `px` is converted to `rem`
.convert {
    font-size: 16px; // converted to 1rem
}

// `Px` or `PX` is ignored by `postcss-pxtorpx` but still accepted by browsers
.ignore {
    border: 1Px solid; // ignored
    border-width: 2PX; // ignored
}

REF

开发本插件之前，没有留意到已经有童鞋做了一个类似的, 不过看下功能，本插件应该更加强大一些，故取其同名加pro。

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