support css module feature

packages/taro-cli/package.json

@@ -45,6 +45,7 @@
     "css-to-react-native-transform": "^1.4.0",
     "ejs": "^2.6.1",
     "fs-extra": "^5.0.0",
+    "generic-names": "^2.0.1",
     "glob": "^7.1.2",
     "inquirer": "^5.2.0",
     "klaw": "^2.1.1",
@@ -55,6 +56,11 @@
     "minimatch": "^3.0.4",
     "ora": "^2.0.0",
     "postcss": "^6.0.22",
+    "postcss-modules-extract-imports": "^1.1.0",
+    "postcss-modules-local-by-default": "^1.2.0",
+    "postcss-modules-resolve-imports": "^1.3.0",
+    "postcss-modules-scope": "^1.1.0",
+    "postcss-modules-values": "^1.3.0",
     "postcss-pxtransform": "1.2.0-alpha.3",
     "postcss-url": "^7.3.2",
     "prettier": "^1.14.3",

packages/taro-cli/src/weapp.js

@@ -10,11 +10,18 @@ const t = require('babel-types')
 const generate = require('babel-generator').default
 const template = require('babel-template')
 const autoprefixer = require('autoprefixer')
+const minimatch = require('minimatch')
+const _ = require('lodash')
+
 const postcss = require('postcss')
 const pxtransform = require('postcss-pxtransform')
 const cssUrlParse = require('postcss-url')
-const minimatch = require('minimatch')
-const _ = require('lodash')
+const Scope = require('postcss-modules-scope')
+const Values = require('postcss-modules-values')
+const genericNames = require('generic-names')
+const LocalByDefault = require('postcss-modules-local-by-default')
+const ExtractImports = require('postcss-modules-extract-imports')
+const ResolveImports = require('postcss-modules-resolve-imports')
 
 const Util = require('./util')
 const CONFIG = require('./config')
@@ -359,6 +366,7 @@ function parseAst (type, ast, depComponents, sourceFilePath, filePath, npmSkip =
       const node = astPath.node
       const source = node.source
       let value = source.value
+      const specifiers = node.specifiers
       if (Util.isNpmPkg(value) && notExistNpmList.indexOf(value) < 0) {
         if (value === taroJsComponents) {
           astPath.remove()
@@ -403,6 +411,28 @@ function parseAst (type, ast, depComponents, sourceFilePath, filePath, npmSkip =
             }
           }
         }
+      } else if (Util.CSS_EXT.indexOf(path.extname(value)) !== -1 && specifiers.length > 0) { // 对 使用 import style from './style.css' 语法引入的做转化处理
+        const specifiersName = specifiers[0].local.name
+        Util.printLog(Util.pocessTypeEnum.GENERATE, '替换代码', `为文件 ${sourceFilePath} 生成css-module`)
+        const styleFilePath = path.join(path.dirname(sourceFilePath), value)
+        const styleCode = fs.readFileSync(styleFilePath).toString()
+        const result = processStyleUseCssModule({
+          css: styleCode,
+          filePath: styleFilePath
+        })
+        const tokens = result.root.exports || {}
+        const objectPropperties = []
+        for (const key in tokens) {
+          if (tokens.hasOwnProperty(key)) {
+            objectPropperties.push(t.objectProperty(t.identifier(key), t.stringLiteral(tokens[key])))
+          }
+        }
+        astPath.replaceWith(
+          t.variableDeclaration('const', [t.variableDeclarator(t.identifier(specifiersName), t.objectExpression(objectPropperties))])
+        )
+        if (styleFiles.indexOf(styleFilePath) < 0) { // add this css file to queue
+          styleFiles.push(styleFilePath)
+        }
       } else if (path.isAbsolute(value)) {
         Util.printLog(Util.pocessTypeEnum.ERROR, '引用文件', `文件 ${sourceFilePath} 中引用 ${value} 是绝对路径！`)
       }
@@ -1260,9 +1290,41 @@ async function buildSinglePage (page) {
   }
 }
 
+/**
+ * css module processor
+ * @param styleObj { css: string, filePath: '' }
+ * @returns postcss.process()
+ */
+function processStyleUseCssModule (styleObj) {
+  // 对 xxx.global.[css|scss|less|styl] 等样式文件不做处理
+  const DO_NOT_USE_CSS_MODULE = '.global'
+  if (styleObj.filePath.indexOf(DO_NOT_USE_CSS_MODULE) > -1) return styleObj
+  const useModuleConf = weappConf.module || {}
+  const customPostcssConf = useModuleConf.postcss || {}
+  const generateScopedName = customPostcssConf.module.generateScopedName
+  const context = process.cwd()
+  let scopedName
+  if (generateScopedName) {
+    scopedName = genericNames(generateScopedName, { context })
+  } else {
+    scopedName = (local, filename) => Scope.generateScopedName(local, path.relative(context, filename))
+  }
+  const postcssPlugins = [
+    Values,
+    LocalByDefault,
+    ExtractImports,
+    new Scope({ generateScopedName: scopedName }),
+    new ResolveImports({ resolve: Object.assign({}, { extensions: Util.CSS_EXT }) }),
+  ]
+  const runner = postcss(postcssPlugins)
+  const result = runner.process(styleObj.css, Object.assign({}, { from: styleObj.filePath }))
+  return result
+}
+
 async function processStyleWithPostCSS (styleObj) {
   const useModuleConf = weappConf.module || {}
   const customPostcssConf = useModuleConf.postcss || {}
+  const useCssModule = customPostcssConf.module
   const customPxtransformConf =  Object.assign({
     enable: true,
     config: {}
@@ -1304,9 +1366,9 @@ async function processStyleWithPostCSS (styleObj) {
       encodeType: 'base64'
     }))
   }
-  const postcssResult = await postcss(processors).process(styleObj.css, {
-    from: styleObj.filePath
-  })
+  let css = styleObj.css
+  if (useCssModule) css = processStyleUseCssModule(styleObj).css
+  const postcssResult = await postcss(processors).process(css, { from: styleObj.filePath })
   return postcssResult.css
 }
 

packages/taro-cli/templates/default/config/index

@@ -33,6 +33,9 @@ const config = {
   weapp: {
     module: {
       postcss: {
+        module: {
+          generateScopedName: '[name]__[local]___[hash:base64:5]',
+        },
         autoprefixer: {
           enable: true
         },