Parsing HTML to get script variable value

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Very simple example of how this could be easy using a HTMLAgilityPack and Jurassic library to evaluate the result:

var html = @"<html>
             // Some HTML
             <script>
               var spect = [['temper', 'init', []],
               ['fw\/lib', 'init', [{staticRoot: '//site.com/js/'}]],
               [""cap"",""dm"",[{""tackmod"":""profile"",""xMod"":""timed""}]]];
             </script>
             // More HTML
             </html>";

// Grab the content of the first script element
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html);
var script = doc.DocumentNode.Descendants()
                             .Where(n => n.Name == "script")
                             .First().InnerText;

// Return the data of spect and stringify it into a proper JSON object
var engine = new Jurassic.ScriptEngine();
var result = engine.Evaluate("(function() { " + script + " return spect; })()");
var json = JSONObject.Stringify(engine, result);

Console.WriteLine(json);
Console.ReadKey();

Output:

[[“temper”,”init”,[]],[“fw/lib”,”init”,[{“staticRoot”:”//site.com/js/”}]],[“cap”,”dm”,[{“tackmod”:”profile”,”xMod”:”timed”}]]]

Note: I am not accounting for errors or anything else, this merely serves as an example of how to grab the script and evaluate for the value of spect.

There are a few other libraries for executing/evaluating JavaScript as well.

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