Interpreting JavaScript through code written in Ruby

Question

Interpreting JavaScript through code written in Ruby

Currently, I am working on a test code using Ruby where my objective is to parse an HTML source file of a website. The HTML source contains a JavaScript variable that I need to compare with other values. For instance:

<script type="text/javascript" language="JavaScript>
  function GetParam(name) {   
    var req_var = {
      a: 'xyz', 
      b: 'yy.com', 
      c: 'en', 
      d:0, 
      e: 'y'
     };
  }
</script>

My task involves extracting the variable req_var from this script. Is there a way to achieve this? If yes, I would appreciate any assistance or guidance on how to go about it.

javascript ruby nokogiri

Answer 1

Answer №1

Using Ruby to parse JavaScript

Answer 2

Using Ruby to parse JavaScript

Answer 3

Answer №2

To extract specific data from a string, you could utilize a regular expression in the following way:

text = "function ExtractData(details) { var info_data = { x: 'abc' , y: 'xx.com' , z: 'fr' , s:3 , t: 'z'}; }"
result = text.match(/var\s+info_data\s+=\s+(.*?);/m)[1]
console.log(result)

=> "{ x: 'abc' , y: 'xx.com' , z: 'fr' , s:3 , t: 'z'}"

Answer 4

To extract specific data from a string, you could utilize a regular expression in the following way:

text = "function ExtractData(details) { var info_data = { x: 'abc' , y: 'xx.com' , z: 'fr' , s:3 , t: 'z'}; }"
result = text.match(/var\s+info_data\s+=\s+(.*?);/m)[1]
console.log(result)

=> "{ x: 'abc' , y: 'xx.com' , z: 'fr' , s:3 , t: 'z'}"

Answer 5

Answer №3

While trying to use the rkelly gem, I encountered an exception. As a result, I switched to the fork rkelly-remix. Keep in mind that you need to uninstall the original gem due to conflicting names:

gem uninstall rkelly
gem install rkelly-remix

My JavaScript code looked like this:

  var xpos = 0;
  var ypos = 0;
  var city = 'Parish';
  var cashSaldo = '0.00';
  var bankSaldo = '';
  var address = 'Lot: 0 - 0';
  var simplemode = true;
  var email_reminder = true;
  var text_citylist = 'Take a cab to';
  // more variables ...

This is the snippet of code I needed to employ for parsing it:

o = lambda do |x|
  # parsing logic here ...
end

require "rkelly"

result = Hash[ RKelly::Parser.new.parse(my_js_code).to_sexp.map do |k, v|
  # parsing process ...
end ]

By utilizing the above approach, the output becomes:

{:xpos=>0,
 :ypos=>0,
 :city=>"Parish",
 :cashSaldo=>"0.00",
 :bankSaldo=>"",
 :address=>"Lot: 0 - 0",
 :simplemode=>true,
 :email_reminder=>true,
 :text_citylist=>"Take a cab to",
 :text_nostreet=>"Lot",
 :text_lotpos=>"Lot:",
 :text_products_title=>"Products",
   // more key-value pairs ...

Answer 6

While trying to use the rkelly gem, I encountered an exception. As a result, I switched to the fork rkelly-remix. Keep in mind that you need to uninstall the original gem due to conflicting names:

gem uninstall rkelly
gem install rkelly-remix

My JavaScript code looked like this:

  var xpos = 0;
  var ypos = 0;
  var city = 'Parish';
  var cashSaldo = '0.00';
  var bankSaldo = '';
  var address = 'Lot: 0 - 0';
  var simplemode = true;
  var email_reminder = true;
  var text_citylist = 'Take a cab to';
  // more variables ...

This is the snippet of code I needed to employ for parsing it:

o = lambda do |x|
  # parsing logic here ...
end

require "rkelly"

result = Hash[ RKelly::Parser.new.parse(my_js_code).to_sexp.map do |k, v|
  # parsing process ...
end ]

By utilizing the above approach, the output becomes:

{:xpos=>0,
 :ypos=>0,
 :city=>"Parish",
 :cashSaldo=>"0.00",
 :bankSaldo=>"",
 :address=>"Lot: 0 - 0",
 :simplemode=>true,
 :email_reminder=>true,
 :text_citylist=>"Take a cab to",
 :text_nostreet=>"Lot",
 :text_lotpos=>"Lot:",
 :text_products_title=>"Products",
   // more key-value pairs ...

Interpreting JavaScript through code written in Ruby

Answer №1

Answer №2

Answer №3

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