javascript - 将 JavaScript 代码转换为 Python

Question

这是java脚本代码，它是一个具有2个功能的解码器:
getOffset，以及主函数asdf。

我想解码此字符串:LqMWJQzZYUWJQpEcYGII26XombQQoqnQQQQoqnqgoqnQQQQoqnQQQQoqnQQQQoqnqgoqnQQQQoqnQQuuuQQoqnQQQQoqnxioqnQQQQoqnQQMJCSVcCgnQQoqnQQQQoqnxioqnQQQQoqnQQnia QQoqnQQQQoqnqgoqnQQQQoqnQQWJQzhYAUoVMTAdAT33nvX3nB

对此:

/ShowUrl-a_partnerKey.1-a_url.http%253A__5F____5F__2F__5F____5F____5F____5F__2F__5F____5F__www__5F____5F__2E__5F____5F__danielnyc__5F____5F__2E__5F____5F__com__5F____5F__2F__5F____ 5F__-a_urlKey.915edf949f66c826c.html

我想将此(工作)javascript 代码转换为 python:

var d = "LqMWJQzZYUWJQpEcYGII26XombQQoqnQQQQoqnqgoqnQQQQoqnQQQQoqnQQQQoqnqgoqnQQQQoqnQQuuuQQoqnQQQQoqnxioqnQQQQoqnQQMJCSVcCgnQQoqnQQQQoqnxioqnQQQQoqnQQniaQQoqnQQQQoqnqgoqnQQQQoqnQQWJQzhYAUoVMTAdAT33nvX3nB"
function asdf(d) {
var h = {
    "": ["&", "=", "p", "6", "?", "H", "%", "B", ".com", "k", "9", ".html", "n", "M", "r", "www.", "h", "b", "t", "a", "0", "/", "d", "O", "j", "http://", "_", "L", "i", "f", "1", "e", "-", "2", ".", "N", "m", "A", "l", "4", "R", "C", "y", "S", "o", "+", "7", "I", "3", "c", "5", "u", 0, "T", "v", "s", "w", "8", "P", 0, "g", 0],
    q: [0, "__3F__", 0, "Photos", 0, "https://", ".edu", "*", "Y", ">", 0, 0, 0, 0, 0, 0, "`", "__2D__", "X", "<", "slot", 0, "ShowUrl", "Owners", 0, "[", "q", 0, "MemberProfile", 0, "ShowUserReviews", '"', "Hotel", 0, 0, "Expedia", "Vacation", "Discount", 0, "UserReview", "Thumbnail", 0, "__2F__", "Inspiration", "V", "Map", ":", "@", 0, "F", "help", 0, 0, "Rental", 0, "Picture", 0, 0, 0, "hotels", 0, "ftp://"],
    x: [0, 0, "J", 0, 0, "Z", 0, 0, 0, ";", 0, "Text", 0, "(", "x", "GenericAds", "U", 0, "careers", 0, 0, 0, "D", 0, "members", "Search", 0, 0, 0, "Post", 0, 0, 0, "Q", 0, "$", 0, "K", 0, "W", 0, "Reviews", 0, ",", "__2E__", 0, 0, 0, 0, 0, 0, 0, "{", "}", 0, "Cheap", ")", 0, 0, 0, "#", ".org"],
    z: [0, "Hotels", 0, 0, "Icon", 0, 0, 0, 0, ".net", 0, 0, "z", 0, 0, "pages", 0, "geo", 0, 0, 0, "cnt", "~", 0, 0, "]", "|", 0, "tripadvisor", "Images", "BookingBuddy", 0, "Commerce", 0, 0, "partnerKey", 0, "area", 0, "Deals", "from", "//", 0, "urlKey", 0, "'", 0, "WeatherUnderground", 0, "MemberSign", "Maps", 0, "matchID", "Packages", "E", "Amenities", "Travel", ".htm", 0, "!", "^", "G"]
};
var b = "";
for (var a = 0; a < d.length; a++) {
    var j = d.charAt(a);
    var f = j;
    if (h[j] && a + 1 < d.length) {
        a++;
        f += d.charAt(a)
    } else {
        j = ""
    }
    var g = getOffset(d.charCodeAt(a));
    if (g < 0 || typeof h[j][g] == "String") {
        b += f
    } else {
        b += h[j][g]
    }
}
return b}
function getOffset(a) {
if (a >= 97 && a <= 122) {
    return a - 61
}
if (a >= 65 && a <= 90) {
    return a - 55
}
if (a >= 48 && a <= 71) {
    return a - 48
}
return -1}
asdf(d)

它返回(如预期):

/ShowUrl-a_partnerKey.1-a_url.http%253A__5F____5F__2F__5F____5F____5F____5F__2F__5F____5F__www__5F____5F__2E__5F____5F__danielnyc__5F____5F__2E__5F____5F__com__5F____5F__2F__5F____ 5F__-a_urlKey.915edf949f66c826c.html

这是我尝试过的Python代码:

d = "LqMWJQzZYUWJQpEcYGII26XombQQoqnQQQQoqnqgoqnQQQQoqnQQQQoqnQQQQoqnqgoqnQQQQoqnQQuuuQQoqnQQQQoqnxioqnQQQQoqnQQMJCSVcCgnQQoqnQQQQoqnxioqnQQQQoqnQQniaQQoqnQQQQoqnqgoqnQQQQoqnQQWJQzhYAUoVMTAdAT33nvX3nB"

def asdf(d):

 h = {
 "" : ["&", "=", "p", "6", "?", "H", "%", "B", ".com", "k", "9", ".html", "n", "M", "r", "www.", "h", "b", "t", "a", "0", "/", "d", "O", "j", "http://", "_", "L", "i", "f", "1", "e", "-", "2", ".", "N", "m", "A", "l", "4", "R", "C", "y", "S", "o", "+", "7", "I", "3", "c", "5", "u", 0, "T", "v", "s", "w", "8", "P", 0, "g", 0],
 "q": [0, "__3F__", 0, "Photos", 0, "https://", ".edu", "*", "Y", ">", 0, 0, 0, 0, 0, 0, "`", "__2D__", "X", "<", "slot", 0, "ShowUrl", "Owners", 0, "[", "q", 0, "MemberProfile", 0, "ShowUserReviews", '"', "Hotel", 0, 0, "Expedia", "Vacation", "Discount", 0, "UserReview", "Thumbnail", 0, "__2F__", "Inspiration", "V", "Map", ":", "@", 0, "F", "help", 0, 0, "Rental", 0, "Picture", 0, 0, 0, "hotels", 0, "ftp://"],
 "x": [0, 0, "J", 0, 0, "Z", 0, 0, 0, ";", 0, "Text", 0, "(", "x", "GenericAds", "U", 0, "careers", 0, 0, 0, "D", 0, "members", "Search", 0, 0, 0, "Post", 0, 0, 0, "Q", 0, "$", 0, "K", 0, "W", 0, "Reviews", 0, ",", "__2E__", 0, 0, 0, 0, 0, 0, 0, "{", "}", 0, "Cheap", ")", 0, 0, 0, "#", ".org"],
 "z": [0, "Hotels", 0, 0, "Icon", 0, 0, 0, 0, ".net", 0, 0, "z", 0, 0, "pages", 0, "geo", 0, 0, 0, "cnt", "~", 0, 0, "]", "|", 0, "tripadvisor", "Images", "BookingBuddy", 0, "Commerce", 0, 0, "partnerKey", 0, "area", 0, "Deals", "from", "//", 0, "urlKey", 0, "'", 0, "WeatherUnderground", 0, "MemberSign", "Maps", 0, "matchID", "Packages", "E", "Amenities", "Travel", ".htm", 0, "!", "^", "G"]
 }
 b = ""

 for a in range(len(d)):
     j=d[a]
     f=j
     list =[]
     for key in h:
        list.append(key)
     if j in list and a+1 < len(d):
         a=a+1
         f = f+d[a]
     else:
         j = ""
     g = getOffset(ord(d[a]))
     if g < 0 or type(h[j][g]) is str:
         b = b + f
     else:
         b = b+str(h[j][g])
         print b
 return b

def getOffset(a):
    if(a >= 97 and a <= 122):
        return(a-61)        
    if(a >= 65 and a <= 90):
        return(a-55)
    if(a >= 48 and a <=71):
        return(a-48)
    return(-1)
print asdf(d)  

但它给了我未解码的字符串:LqMWJQzZYUWJQpEcYGII26XombQQoqnQQQQoqnqgoqnQQQQoqnQQQQoqnQQQQoqnqgoqnQQQQoqnQQuuuQQoqnQQQQoqnxioqnQQQQoqnQQMJCSVcCgnQQoqnQQQQoqnxioqnQQQQ oqnQQniaQQoqnQQQQoqnqgoqnQQQQoqnQQWJQzhYAUoVMTAdAT33nvX3nB

我的代码有什么问题吗？为什么我没有得到与 javascript 代码相同的结果？

Answer 1

实际上，你的 Javascript 代码有一个错误 - 如果错误被修复，那么你的 JS 代码就会中断，返回原始字符串，就像你的 Python 代码一样。

if (g < 0 || typeof h[j][g] == "String")行为不符合您的预期:

typeof h[j][g] == "String")应该是
if (g < 0 || typeof h[j][g] == "string")
(注意未大写的字符串)。

事实上是错误的typeof h[j][g] == "String") ，实际上相当于
if (g < 0) {...

如果您在两个版本的代码中更改该行，您将在 JS 中获得所需的结果，并且在 Python 中几乎获得所需的结果(其中还有另一个错误)。

<小时/>

Javascript版本

更改:

var g = getOffset(d.charCodeAt(a));
    if (g < 0 || typeof h[j][g] == "String") {     #THIS LINE IS INCORRECT
        b += f
    } else {
        b += h[j][g]
    }

致:

var g = getOffset(d.charCodeAt(a));
    if (g < 0){                       # CHANGE THIS LINE
        b += f
    } else {
        b += h[j][g]
    }

JS 结果:

/ShowUrl-a_partnerKey.1-a_url.http%253A__5F____5F__2F__5F____5F____5F____5F__2F__5F____5F__www__5F____5F__2E__5F____5F__danielnyc__5F____5F__2E__5F____5F__com__5F____5F__2F__5F____5F__-a_urlKey.915edf949f66c826c.html

<小时/>

Python版本

更改:

 g = getOffset(ord(d[a]))
 if g < 0 or type(h[j][g]) is str:    # THIS LINE IS INCORRECT
     b = b + f
 else:
     b = b+str(h[j][g])
     print b                          # THIS LINE SHOULD BE REMOVED

致:

 g = getOffset(ord(d[a]))             # CHANGED THIS LINE
 if g < 0:
     b = b + f
 else:
     b = b+str(h[j][g])   
     #print b                         # REMOVED THIS LINE

结果:

/ShowUrld-a_partnerKeyN.1-a_url.http%253A__5Fc____5Fc__2F__y5Fc____5Fc____5Fc____5Fc__2F__y5Fc____5Fc__www__5Fc____5Fc__2E__o5Fc____5Fc__danielnyc__5Fc____5Fc__2E__o5Fc____5Fc__com__5Fc____5Fc__2F__y5Fc____5Fc__-a_urlKeyS.915edf949f66c826c.html

以下是最终代码的链接:

• JavaScript repl
• Python repl

<小时/>

最终的 PYTHON 修复

现在，你又遇到了一个 Python 错误..使用时for a in ..构造时，您无法在内部更改 a 的值，如行中所示:a = a + 1 .

嗯，你可以，但这会导致意想不到的结果。
每次for a in..到达循环顶部，a将递增到它本来的下一个值，无论您暂时将其更改为在循环内什么值!!

因此，(2, 'M'), (7, 'Z'), ...没有被跳过，并且您有意为之!
这就是为什么我上面显示的 Python 结果的字符数比您预期的要多一些。

参见these SO answers for great explanations and examples ，和 python docs here ，或this closed SO question .

在这种情况下转换代码的最简单方法是简单地使用 while循环而不是 for in环形。这样，两种语言的内在逻辑基本上保持相同。

更改:

 #for a in range(len(d)):     ## Remove and Change this to a WHILE loop as below
  a = 0                       #  Manually initialize your loop
  print(len(d))
  while a < len(d):           # Use WHILE loop instead 
    j = d[a]

    ...

并且..

    ...

    g = getOffset(ord(d[a]))
    if  g < 0 :                   # Remember to UPDATE This Line (Remove #or type(h[j][g]) is str:)
        b = b + f
    else:
        b = b + str(h[j][g])
        #print b                  # REMOVE this line

    a = a + 1                     # Manually increment your WHILE loop
  return b

FINAL PYTHON CODE on REPL.IT)

最终的 Python 结果:

/ShowUrl-a_partnerKey.1-a_url.http%253A__5F____5F__2F__5F____5F____5F____5F__2F__5F____5F__www__5F____5F__2E__5F____5F__danielnyc__5F____5F__2E__5F____5F__com__5F____5F__2F__5F____5F__-a_urlKey.915edf949f66c826c.html