Curt Hagenlocher wrote:
That's only because you've decided to arbitrarily[*] define "\n\n" as
being a signal to mean "complete". That's not part of the actual
language specification.
It's the behaviour of the interactive interpreter though - which
specifies something. It's also the specification adhered to by the code
module for implementing interactive interpreters.
In fact, if I append "\n\n print 2\n\n" to that string, it's still a
valid Python program. The key here is that "the user has entered a
complete thought" is a property of the interpreter and not of the
language. I might well decide that the "commit" key sequence is
Control+E (as it is in SQL Server Management Studio) instead of "enter
enter".
My point is that it's not correct for IronPython to dictate the
semantics of your interpreter.
Fine, so do you have any suggestions as to how to replicate the
behaviour of the interactive interpreter - whether or not it counts as a
specification?
Michael
[*] Okay, "arbitrary" is a bit strong in that it's what python.exe and
ipy.exe defines. :)
On Thu, Apr 16, 2009 at 10:36 AM, Michael Foord
<[email protected] <mailto:[email protected]>> wrote:
Curt Hagenlocher wrote:
"IncompleteStatement" means that the user is allowed to type
more code. If you want to know whether or not it's a valid
(complete) string, just check for it not being Invalid. A
function definition is never "complete" in Python because
there's never a terminating curly brace :).
But that isn't sufficient to implement an interactive interpreter
on top of. This code conceptually is complete as far as an
interactive interpreter is concerned:
'def f():\n print 1\n\n'
It also means you can't distinguish between the previous kind of
incomplete (which is incomplete because the user *could* type more
code) and this kind of incomplete:
'a = """'
or:
'a = (1 + 2 +'
Which are both incomplete because the user *must* type more code.
(Although the latter two give IncompleteToken - I wonder if that
would be enough.)
Because of the other IronPython bugs we can't use the code module
and ScriptSource / ScriptParseResult doesn't give sufficient
information. Any other ideas?
Michael
On Thu, Apr 16, 2009 at 10:05 AM, Michael Foord
<[email protected] <mailto:[email protected]>
<mailto:[email protected]
<mailto:[email protected]>>> wrote:
Hello guys,
We're trying to detect whether a section of code is
complete (to
mimic the behaviour of the interactive interpreter).
First of all we tried using the Python standard library code
module which provides interactive console classes. There
are two
outstanding bugs on codeplex (one reported by me today) which
prevent this being an ideal solution:
http://ironpython.codeplex.com/WorkItem/View.aspx?WorkItemId=22064
http://ironpython.codeplex.com/WorkItem/View.aspx?WorkItemId=21881
The second approach was to create a ScriptSource and looking at
the code properties to tell if the statement is complete or not
(using IronPython 2.0.1). However we can never get it to
return a
ScriptParseResult.Complete for function definitions. Code below
shows using \n for newlines but we have also tried with \r\n.
>>> import clr
>>> clr.AddReference('IronPython')
>>> clr.AddReference('Microsoft.Scripting')
>>> from IronPython.Hosting import Python
>>> from Microsoft.Scripting import SourceCodeKind,
ScriptCodeParseResult
>>>
>>> engine = Python.CreateEngine()
>>> s = engine.CreateScriptSourceFromString('def f():\n print
1\n', 'foo', SourceCodeKind.InteractiveCode)
>>> s.GetCodeProperties()
<Microsoft.Scripting.ScriptCodeParseResult object at
0x000000000000003F [IncompleteStatement]>
>>> s = engine.CreateScriptSourceFromString('def f():\n print
1\n\n', 'foo', SourceCodeKind.InteractiveCode)
>>> s.GetCodeProperties()
<Microsoft.Scripting.ScriptCodeParseResult object at
0x0000000000000040 [IncompleteStatement]>
>>>
The DLR hosting spec has little helpful to say on the matter as
far as I can tell.
Looking at an example from Tomas it doesn't seem very different
from what we're doing:
http://blog.tomasm.net/2009/04/15/python-says-hello-to-ruby/
Any clues as to what we are doing wrong or how to procede?
Thanks
Michael
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