index.js
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// postcss-mpvuew-wxss.js
// https://github.com/postcss/postcss/blob/master/docs/writing-a-plugin.md
const postcss = require('postcss');
const selectorParser = require('postcss-selector-parser');
const replaceTagSelector = require('./lib/wxmlTagMap');
const defConfig = {
cleanSelector: ['*'],
remToRpx: 100,
replaceTagSelector
};
const remReg = /(\d*\.?\d+)rem/ig;
const replaceRemOption = { fast: 'rem' };
module.exports = postcss.plugin('postcss-mpvue-wxss', function (options) {
// Work with options here
options = Object.assign({}, defConfig, options);
return function (root) {
// Transform CSS AST here： root, result
root.walkRules(rule => {
const { selector } = rule || {};
// rem 转换 rpx
rule.replaceValues(remReg, replaceRemOption, str => {
return options.remToRpx * parseFloat(str) + 'rpx';
});
rule.selector = selectorParser(function (selectors) {
selectors.each(function (selector) {
selector.each(function (n) {
// 转换 tag 选择器
if (n.type === 'tag') {
const k = n.value;
const v = options.replaceTagSelector[k];
if (v) {
n.value = v === 'replaceToClass' ? `._${k}` : v;
}
}
// 清理不支持的选择器
if (options.cleanSelector.includes(n.value)) {
// return n.value = 'view';
return rule.remove()
}
})
})
}).process(selector).result;
});
// 清理所有的注释
root.walkComments(comment => {
comment.remove();
});
};
});