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/**
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* @fileoverview 条件编译
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*/
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const through2 = require('through2')
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/**
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* @description 条件编译
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* @param {string} platform 平台
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*/
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module.exports = function (platform) {
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return through2.obj(function (file, _, callback) {
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if (file.isBuffer()) {
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// 文件夹级别的处理
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if (file.relative.includes('miniprogram')) {
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if (platform !== 'uni-app') {
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// 去掉这一层
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file.path = file.path.replace(/(.*)[/\\]miniprogram/, '$1')
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} else {
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// 不用于本平台的文件
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callback()
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return
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}
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} else if (file.relative.includes('uni-app')) {
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if (platform === 'uni-app') {
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file.path = file.path.replace(/(.*)[/\\]uni-app/, '$1')
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} else {
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callback()
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return
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}
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}
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if (platform === 'uni-app') {
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// uni-app 平台 vue3 要求使用 es6 模块
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let content = file.contents.toString()
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if (file.basename === 'prism.min.js') {
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content = content.replace('"undefined"!=typeof module&&module.exports&&(module.exports=Prism),', 'export default Prism;')
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} else if (file.extname === '.js' && !file.relative.includes('static')) {
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content = content.replace(/module.exports\s*=\s*/, 'export default ')
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.replace(/const\s+([^\s=]+)\s*=\s*require\(([^)]+)\)/g, 'import $1 from $2')
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}
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file.contents = Buffer.from(content)
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} else {
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// 小程序平台进行进一步处理
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let content = file.contents.toString()
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/**
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* 方式1：
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* 在注释 #if(n)def xxx 和 #endif 之间的内容会根据是否定义 xxx 决定是否保留
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*/
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const commentReg = /\/\*[\s\S]*?\*\/|\/\/[^\n]*|<!--[\s\S]*?-->/g // 提取所有注释
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const copy = content // 拷贝一个副本用于搜索
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let match = commentReg.exec(copy)
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const stack = []
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while (match) {
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if (match[0].includes('#if')) {
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stack.push([match[0], match.index])
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} else if (match[0].includes('#endif')) {
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const item = stack.pop()
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if (!item) {
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throw Error('条件编译错误：存在多余的 #endif，path:' + file.path + '，content: ' + content.substr(match.index, 100))
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}
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const def = item[0].match(/MP-[A-Z]+/gi) || [] // 取出定义条件
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let hit = false
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for (let i = 0; i < def.length; i++) {
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if (def[i] && platform === def[i].toLowerCase()) {
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hit = true // 命中
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break
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}
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}
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// 不匹配
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if ((item[0].includes('#ifdef') && !hit) || (item[0].includes('#ifndef') && hit)) {
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let fill = ''
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// 用空格填充
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for (let j = item[1] + item[0].length; j < match.index; j++) {
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if (content[j] === '\n') {
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fill += '\n'
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} else {
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fill += ' '
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}
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}
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content = content.substr(0, item[1] + item[0].length) + fill + content.substr(match.index)
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}
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}
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match = commentReg.exec(copy)
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}
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if (stack.length) {
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throw Error('条件编译错误：存在未闭合的 #ifdef，path:' + file.path + '，content: ' + content.substr(stack[0][1], 100))
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}
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/**
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* 方式2：
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* wxml 中属性前加平台名将仅编译到该平台，如 mp-weixin:attr
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*/
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if (file.extname === '.wxml') {
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content = content.replace(/([^:\s]+:[^=\s]+)\s*=\s*"(.*?)"/g, ($, $1, $2) => {
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const platforms = $1.split(':')
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let name = platforms.pop()
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const last = platforms[platforms.length - 1]
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if (last && !last.includes('mp')) {
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name = platforms.pop() + ':' + name
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}
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if (!platforms.length) return $
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let i
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for (i = platforms.length; i--;) {
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if (platform === platforms[i].toLowerCase()) break
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}
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if (i >= 0) return `${name}="${$2}"`
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return ''
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})
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}
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file.contents = Buffer.from(content)
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}
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}
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this.push(file)
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callback()
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})
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}
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