forked from IOriens/postcss-wxss
/
index.js
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index.js
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var postcss = require('postcss')
var valueParser = require('postcss-value-parser')
var selectorParser = require('postcss-selector-parser')
var unit = valueParser.unit
var walk = valueParser.walk
var transformSelector = (complexSelector, transformer) => {
return selectorParser(transformer).processSync(complexSelector)
}
function parseWord (node, opts) {
const pair = unit(node.value)
if (pair) {
const num = Number(pair.number)
const u = pair.unit.toLowerCase()
if (u === 'rpx') {
node.value = `%%?${num + u}?%%`
}
}
}
var tranformValue = (decl, opts) =>
valueParser(decl.value)
.walk(node => {
if (node.type === 'word') {
parseWord(node, opts)
} else if (node.type === 'function') {
if (node.value === 'url') {
return false
}
walk(node.nodes, n => {
if (n.type === 'word') {
parseWord(n, opts)
}
})
return false
}
})
.toString()
module.exports = postcss.plugin('postcss-wxss', function (opts) {
opts = opts || {}
return (root, result) => {
// Transform CSS AST here
root.walkRules(rule => {
// Transform each rule here
// rule.selectors == comma seperated selectors
// a, b.c {} => ["a", "b.c"]
rule.selectors = rule.selectors.map(complexSelector =>
// complexSelector => simpleSelectors
// "a.b#c" => ["a", ".b", "#c"]
transformSelector(complexSelector, simpleSelectors =>
// only process type selector, leave alone class & id selectors
simpleSelectors.walkTags(tag => {
if (tag.value === 'page') {
tag.value = 'body'
} else if (tag.value.substring(0, 3) !== 'wx-') {
tag.value = 'wx-' + tag.value
}
})
)
)
// handle rpx unit
rule.walkDecls(decl => {
// Transform each property declaration here
// console.log(decl)
// decl.value = decl.value.replace(/[+-]?[0-9]*\.?([0-9]*)rpx/g, match => {
// return `%%?${match}?%%`
// })
decl.value = tranformValue(decl, opts)
})
})
}
})