问如何使用uglifyjs / uglifyjs2解析遍历和eval javascript表达式

EN

var smallVariableNames = [];

function addBadVariableName(line,value){
    smallVariableNames.push(line + " "+value);
}

var UglifyJS = require("../tools/node"); //Please install node first
var parser = UglifyJS.parser             // Parse input.js file and create AST 
    , fs = require('fs')
    , filename = 'input.js';


var toplevel = UglifyJS.parse(String(fs.readFileSync(filename)));
var walker = new UglifyJS.TreeWalker(function(node){  //walk AST 
var statement = JSON.parse(JSON.stringify(node));

if  (node instanceof UglifyJS.AST_VarDef || node instanceof UglifyJS.AST_Constant) 

    {

    var parentForIn = walker.find_parent(UglifyJS.AST_ForIn); //in order to avoid init vars in for..in loops 
    var parentLoopVariable ="";
    if (parentForIn) {

        parentLoopVariable = JSON.parse(JSON.stringify(parentForIn));
        parentLoopVariable = parentLoopVariable["init"];
        parentLoopVariable = parentLoopVariable["definitions"];
        if (parentLoopVariable)
        parentLoopVariable = parentLoopVariable[0].name["end"].value;
    }
    var parentFor = walker.find_parent(UglifyJS.AST_For); //in order to avoid init vars in for loops 

    if (parentFor) {
         parentLoopVariable = JSON.parse(JSON.stringify(parentFor));
        parentLoopVariable = parentLoopVariable["init"];
        parentLoopVariable = parentLoopVariable["definitions"];
        if (parentLoopVariable)
            parentLoopVariable = parentLoopVariable[0].name["end"].value;
    }


        var expression = statement["name"];
        if (expression) {
            variableName = node.start.value
            if(variableName  && variableName.length < 3 && variableName !== parentLoopVariable)
                {
                    addBadVariableName(node.start.line,variableName); 
                }
        }


    }
});
toplevel.walk(walker);
for (line in smallVariableNames)
    console.log(smallVariableNames[line]);