Embedding the interactive interpreter

[Andreas Bednarek]

Hi,

I'm embedding the interpreter into a C# app using the
Boo.Lang.Interpreter.InteractiveInterpreter2 class. User input comes
from a winform Control (RichTextBox) and I call the
InteractiveInterpreter2.Eval(string code) method for any entered
lines.

How would I get all the output of the interpreter back to display to
user? Stdout can't probably be redirected, because that's used by the
host application for logging already, that must not mix up. I can
explore CompilerContext.Warnings and CompilerContext.Errors in the
result of Eval(), but don't see a way to display results of the
evaluation.

Thanks

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[Andreas Bednarek]

I forgot the Boo version: 0.9.2.3383

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[Rodrigo B. de Oliveira]

Hi there!

On Sun, Nov 1, 2009 at 12:39 PM, andris <andris@...> wrote:
>...
> How would I get all the output of the interpreter back to display to
> user?

There's no output from the interpreter itself. Not for Eval anyway.

If the code says "print 'Hello!'" it would simply go to stdout.
There's this helper class ConsoleCapture that can be used for
capturing stdout somewhat conveniently:

    import Boo.Lang.Interpreter

    interpreter = InteractiveInterpreter2()

    using console = ConsoleCapture():
        interpreter.Eval("print 'Hello!'")

    assert 'Hello!' == console.ToString().Trim()

> Stdout can't probably be redirected, because that's used by the
> host application for logging already, that must not mix up.

So the above won't work for you I guess....

> I can
> explore CompilerContext.Warnings and CompilerContext.Errors in the
> result of Eval(), but don't see a way to display results of the
> evaluation.
>

You mean the value of the last evaluated expression? You can access
through the LastValue property but you must ask the interpreter to
remember it:

    import Boo.Lang.Interpreter

    interpreter = InteractiveInterpreter2(RememberLastValue: true)
    interpreter.Eval("2 * 21")
    assert 42 == interpreter.LastValue

Cheers,
Rodrigo

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[Andreas Bednarek]

Hi, thanks for the tips,

> If the code says "print 'Hello!'" it would simply go to stdout.
> There's this helper class ConsoleCapture that can be used for
> capturing stdout somewhat conveniently:

ConsoleCapture will help me, for application logging I have yet a
LogFileListener that can be used, receives log messages and saves to
file instead passing them to stdout, so stdout can be reserved for Boo
atm.

> You can access
> through the LastValue property but you must ask the interpreter to
> remember it:

I see, the LastValue might be useful. But it turns out that I need the
full console output more so that stuff like "for o in objects : print
o" can be used.

Best,
Andris

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