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wuWxss.js
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wuWxss.js
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const wu=require("./wuLib.js");
const path=require("path");
const fs=require("fs");
const {VM}=require('vm2');
const cssbeautify=require('cssbeautify');
const csstree=require('css-tree');
function doWxss(dir,cb){
function GwxCfg(){}
GwxCfg.prototype={$gwx(){}};
for(let i=0;i<100;i++)GwxCfg.prototype["$gwx"+i]=GwxCfg.prototype.$gwx;
let runList={},pureData={},result={},actualPure={},importCnt={},frameName="",onlyTest=true,blockCss=[];//custom block css file which won't be imported by others.(no extension name)
function cssRebuild(data){//need to bind this as {cssFile:__name__} before call
let cssFile;
function statistic(data){
function addStat(id){
if(!importCnt[id])importCnt[id]=1,statistic(pureData[id]);
else ++importCnt[id];
}
if(typeof data==="number")return addStat(data);
for(let content of data)if(typeof content==="object"&&content[0]==2)addStat(content[1]);
}
function makeup(data){
var isPure=typeof data==="number";
if(onlyTest){
statistic(data);
if(!isPure){
if(data.length==1&&data[0][0]==2)data=data[0][1];
else return "";
}
if(!actualPure[data]&&!blockCss.includes(wu.changeExt(wu.toDir(cssFile,frameName),""))){
console.log("Regard "+cssFile+" as pure import file.");
actualPure[data]=cssFile;
}
return "";
}
let res=[],attach="";
if(isPure&&actualPure[data]!=cssFile){
if(actualPure[data])return '@import "'+wu.changeExt(wu.toDir(actualPure[data],cssFile),".wxss")+'";\n';
else{
res.push("/*! Import by _C["+data+"], whose real path we cannot found. */");
attach="/*! Import end */";
}
}
let exactData=isPure?pureData[data]:data;
for(let content of exactData)
if(typeof content==="object"){
switch(content[0]){
case 0://rpx
res.push(content[1]+"rpx");
break;
case 1://add suffix, ignore it for restoring correct!
break;
case 2://import
res.push(makeup(content[1]));
break;
}
}else res.push(content);
return res.join("")+attach;
}
return ()=>{
cssFile=this.cssFile;
if(!result[cssFile])result[cssFile]="";
result[cssFile]+=makeup(data);
};
}
function runVM(name,code){
let wxAppCode={},handle={cssFile:name};
let vm=new VM({sandbox:Object.assign(new GwxCfg(),{__wxAppCode__:wxAppCode,setCssToHead:cssRebuild.bind(handle)})});
vm.run(code);
for(let name in wxAppCode)if(name.endsWith(".wxss")){
handle.cssFile=path.resolve(frameName,"..",name);
wxAppCode[name]();
}
}
function preRun(dir,frameFile,mainCode,files,cb){
wu.addIO(cb);
runList[path.resolve(dir,"./app.wxss")]=mainCode;
for(let name of files)if(name!=frameFile){
wu.get(name,code=>{
code=code.slice(0,code.indexOf("\n"));
if(code.indexOf("setCssToHead")>-1)runList[name]=code.slice(code.indexOf("setCssToHead"));
});
}
}
function runOnce(){
for(let name in runList)runVM(name,runList[name]);
}
function transformCss(style){
let ast=csstree.parse(style);
csstree.walk(ast,function(node){
if(node.type=="Comment"){//Change the comment because the limit of css-tree
node.type="Raw";
node.value="\n/*"+node.value+"*/\n";
}
if(node.type=="TypeSelector"){
if(node.name.startsWith("wx-"))node.name=node.name.slice(3);
else if(node.name=="body")node.name="page";
}
if(node.children){
const removeType=["webkit","moz","ms","o"];
let list={};
node.children.each((son,item)=>{
if(son.type=="Declaration"){
if(list[son.property]){
let a=item,b=list[son.property],x=son,y=b.data,ans=null;
if(x.value.type=='Raw'&&x.value.value.startsWith("progid:DXImageTransform")){
node.children.remove(a);
ans=b;
}else if(y.value.type=='Raw'&&y.value.value.startsWith("progid:DXImageTransform")){
node.children.remove(b);
ans=a;
}else{
let xValue=x.value.children&&x.value.children.head&&x.value.children.head.data.name,yValue=y.value.children&&y.value.children.head&&y.value.children.head.data.name;
if(xValue&&yValue)for(let type of removeType)if(xValue==`-${type}-${yValue}`){
node.children.remove(a);
ans=b;
break;
}else if(yValue==`-${type}-${xValue}`){
node.children.remove(b);
ans=a;
break;
}else{
let mValue=`-${type}-`;
if(xValue.startsWith(mValue))xValue=xValue.slice(mValue.length);
if(yValue.startsWith(mValue))yValue=yValue.slice(mValue.length);
}
if(ans===null)ans=b;
}
list[son.property]=ans;
}else list[son.property]=item;
}
});
for(let name in list)if(!name.startsWith('-'))
for(let type of removeType){
let fullName=`-${type}-${name}`;
if(list[fullName]){
node.children.remove(list[fullName]);
delete list[fullName];
}
}
}
});
return cssbeautify(csstree.generate(ast),{indent:' ',autosemicolon:true});
}
wu.scanDirByExt(dir,".html",files=>{
let frameFile="";
if(fs.existsSync(path.resolve(dir,"page-frame.html")))
frameFile=path.resolve(dir,"page-frame.html");
else if(fs.existsSync(path.resolve(dir,"app-wxss.js")))
frameFile=path.resolve(dir,"app-wxss.js");
else if(fs.existsSync(path.resolve(dir,"page-frame.js")))
frameFile=path.resolve(dir,"page-frame.js");
else throw Error("page-frame-like file is not found in the package by auto.");
wu.get(frameFile,code=>{
code=code.slice(code.indexOf('var setCssToHead = function(file, _xcInvalid'));
code=code.slice(code.indexOf('\nvar _C= ')+1);
let oriCode=code;
code=code.slice(0,code.indexOf('\n'));
let vm=new VM({sandbox:{}});
pureData=vm.run(code+"\n_C");
let mainCode=oriCode.slice(oriCode.indexOf("setCssToHead"),oriCode.lastIndexOf(";var __pageFrameEndTime__"));
console.log("Guess wxss(first turn)...");
preRun(dir,frameFile,mainCode,files,()=>{
frameName=frameFile;
onlyTest=true;
runOnce();
onlyTest=false;
console.log("Import count info: %j",importCnt);
for(let id in pureData)if(!actualPure[id]){
if(!importCnt[id])importCnt[id]=0;
if(importCnt[id]<=1){
console.log("Cannot find pure import for _C["+id+"] which is only imported "+importCnt[id]+" times. Let importing become copying.");
}else{
let newFile=path.resolve(dir,"__wuBaseWxss__/"+id+".wxss");
console.log("Cannot find pure import for _C["+id+"], force to save it in ("+newFile+").");
id=Number.parseInt(id);
actualPure[id]=newFile;
cssRebuild.call({cssFile:newFile},id)();
}
}
console.log("Guess wxss(first turn) done.\nGenerate wxss(second turn)...");
runOnce()
console.log("Generate wxss(second turn) done.\nSave wxss...");
for(let name in result)wu.save(wu.changeExt(name,".wxss"),transformCss(result[name]));
let delFiles={};
for(let name of files)delFiles[name]=8;
delFiles[frameFile]=4;
cb(delFiles);
});
});
});
}
module.exports={doWxss:doWxss};
if(require.main===module){
wu.commandExecute(doWxss,"Restore wxss files.\n\n<dirs...>\n\n<dirs...> restore wxss file from a unpacked directory(Have page-frame.html (or app-wxss.js) and other html file).");
}