public void Load(string path)
{
try
{
string source = File.ReadAllText(path);
var script = new ScriptData(GetId(path), path, source);
scripts.Add(script.Id, script);
debugger.AddScript(script);
}
catch (Exception ex) when(ex is FileNotFoundException || ex is PathTooLongException || ex is DirectoryNotFoundException || ex is IOException || ex is UnauthorizedAccessException)
{
string fileName = Path.GetFileName(path);
throw new ScriptLoaderException($"Could not load '{fileName}': {ex.Message}", ex);
}
}
/// <summary>
/// Adds a script to the execution queue.
/// </summary>
/// <param name="data">Script metadata</param>
public void AddScript(ScriptData data)
{
// We need to parse the script ourselves (rather than using the Jint Engine constructor
// that takes the source code as string) - in order to get the parser to assign our ID
// as Source in the AST nodes' Location property.
var parser = new JavaScriptParser(data.Script, new ParserOptions(data.Id)
{
AdaptRegexp = true,
Loc = true,
Tolerant = true
});
data.Ast = parser.ParseScript();
scripts.Add(data);
}
/// <summary>
/// Adds breakpoint
/// </summary>
/// <param name="scriptId">ID of script</param>
/// <param name="line">Line number (starting from 1)</param>
/// <returns></returns>
public bool TryAddBreakPoint(string scriptId, int line)
{
ScriptData script = GetScript(scriptId);
if (script == null)
{
return(false);
}
var node = script.GetNodeAtLine(script.Ast, line);
if (node == null)
{
return(false);
}
engine.BreakPoints.Add(new BreakPoint(node.Location.Source, node.Location.Start.Line, node.Location.Start.Column));
return(true);
}
/// <summary>
/// Executes the scripts in the debugger.
/// </summary>
public void Execute()
{
IsRunning = true;
cts = new CancellationTokenSource();
try
{
// We run the debugger script execution on a separate thread. Why?
// In a GUI app this is necessary, since Jint signals reaching a breakpoint
// or step by triggering an event. When the event handler returns, script execution
// continues. That means we'd be blocking the UI thread until the entire script is done
// executing (if it ever is).
// In a console app, it would be doable - do e.g. a Console.ReadLine when handling
// the Step/Break event. However, we also want to be able to run a script without stepping,
// and then stop/pause it if, for example, it ends up in an infinite loop. So, even in our
// console app, the "UI thread" (Console read/write) must not be blocked while Jint is
// executing the script.
Task.Run(() =>
{
try
{
int currentScriptIndex = 0;
while (currentScriptIndex < scripts.Count)
{
ScriptData script = scripts[currentScriptIndex];
engine.Execute(script.Ast);
currentScriptIndex++;
}
}
catch (CancelExecutionException)
{
// Do nothing - the exception is just used to signal cancellation.
}
Done?.Invoke();
}, cts.Token);
}
finally
{
IsRunning = false;
}
}
