Hi all,
I was wondering if IronPython has the ability to reverse/unparse the AST back
into a ource file? Or if someone has perhaps built something to do so?
Here's what I'm trying to do:
I have a game I'm working on, and I'm currently drafting up tools for it. The
tools are being written in C# and are meant to make changing and editing game
files easier. Several of the game files are written in python and are used to
extend objects from the main game source. For instace, I have an Items.py file
that contains the following (minimalized for example):
from ItemModule import *
import copy
class ScriptedItem(Item):
def __init__(self, name, description, itemtypes, primarytype, flags,
usability, value, throwpower):
Item.__init__(self, name, description, itemtypes, primarytype, flags,
usability, value, throwpower, Item.GetNextItemID())
def Clone(self):
return copy.deepcopy(self)
ItemLibrary.AddItem(ScriptedItem("Abounding Crystal", "A colourful crystal
composed of many smaller crystals. It gives off a warm glow.",
ItemType.SynthesisMaterial, ItemType.SynthesisMaterial, 0, ItemUsage.Unusable,
0, 50))
In this case, I'd like to provide a convenient front-end to allow editors to
modify/add/delete items from the list. To do this, my editor need to be able to:
Find and list all the class types (in this example, it'd be only Scripted Item)
Find and list all created items (in this case there'd only be one, Abounding
Crystal). I'd need to find the type (in this caseScriptedItem) and all the
parameter values
Allow editing of parameters and the creation/removal of items.
I tried writing my own parser, but that became increasingly difficult as the
complexity of the Item constructors went up. When I found IronPython and its
ability to generate a walkable AST, I thought I'd found my solution, and indeed
the AST makes it easy to accomplish 1 and 2 of my requirements. However, I'm
currently stuck on how to write back changes made in my editor to the source
file. My initial idea was to preserve the AST and modify values on the existing
nodes for edited items and inject new nodes when new items were created.
However even if I could get this to work correctly, I have no idea how to
reconvert the AST back into a source file. When I asked on stackoverflow, I was
told this is usually done using "prettyprinting" and had some suggestions to
use python's "inspect" property.
I'm not sure how to use inspect to do what I want, and have some concerns over
the amount of effort require to get "prettyprinting" correct, so i wanted to
ask if anyone here has written a prettyprinter for ironpython or perhaps knows
some other way to accomplish my three goals? Any help would be appreciated,
Thanks
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