ast2src 2010.01.21.ast2src

DESCRIPTION: ast2src - reverse compile ast tree back to legal python source code

REQUIRES: LINUX OS AND PYTHON3.1

QUICK TEST: $ python3.1 setup.py build dev --quicktest

SUMMARY:
ast2src is a pure python module.
ast2src is a python ast tree hack.

RECENT CHANGELOG:
20100121 - added ast2src
20091231 - added <<<< and >>>> sugar
20091224 - added pseudomethod interactive console - revamped pseudomethod import hook
20091224 - modularized package - fix install issues - added sdist check
20091209 - improved documentation
20091205 - moved source code to c++
20091116 - package integrated

DEMO USAGE:

PseudoSugar - adding hook <ast2src.PseudoSugar object at 0xb7ba856c> to sys.meta_path
>>> from ast2src import *

>>> ## let's use ast2src's source code as example
>>> import ast2src, ast
>>> source_code1 = open(ast2src.__file__).read()
>>> print( '\n' + re.sub('\n+', '\n', source_code1[:1024]) + '...' )

## import ast2src; reload(ast2src); from ast2src import *
import os, sys
if os.name != 'posix': sys.stderr.write('\nast2src requires linux os\n\n'); exit()
if sys.version_info[:2] != (3, 1): sys.stderr.write('\nast2src requires python3.1\n\n'); exit()
if 1: ###### INIT
import ast2src as _MODULE
if '_SETUP' not in globals(): _SETUP = sys.modules.get('ast2src.setup', None)
def closure(*args, **kwds): return lambda fnc: fnc(*args, **kwds)
def identity(aa): return aa
def _import(ss, globals = globals()):
for aa in ss.split(' '): globals[aa] = __import__(aa)
return identity
class Namespace(object):
def __init__(self, **kwds): vars(self).update(kwds)
@_import('ast builtins collections re ' #### pseudosugar compiler
'imp importlib importlib.abc importlib.util ' #### import hook
'locale') ## PYTHON BUG
class PseudoSugar(ast.NodeVisitor, importlib.abc.Finder, importlib.abc.PyLoader):
## convenience function
@staticmethod
def exec(ss, globa...

>>> ## compile source to ast
>>> ast_tree1 = compile(source_code1, '', 'exec', ast.PyCF_ONLY_AST)
>>> print( Ast2Src.debugnode(ast_tree1)[:1024], '...' )
<class '_ast.Module'> body [<_ast.Import object at 0x9c6ea2c>, <_ast.If object at 0x9c6e7cc>, <_ast.If object at 0x9ab2b0c>, <_ast.If object at 0x9ab2fec>]
<class '_ast.Import'> col_offset 0 lineno 2 names [<_ast.alias object at 0x9c6e2ec>, <_ast.alias object at 0x9c6e9ac>]
<class '_ast.alias'> asname None name 'os'
<class '_ast.alias'> asname None name 'sys'
<class '_ast.If'> body [<_ast.Expr object at 0x9ccc92c>, <_ast.Expr object at 0x9ab2acc>] col_offset 0 lineno 3 orelse [] test <_ast.Compare object at 0x9c6eccc>
<class '_ast.Compare'> col_offset 3 comparators [<_ast.Str object at 0x9ccc9ec>] left <_ast.Attribute object at 0x9c948cc> lineno 3 ops [<_ast.NotEq object at 0xb7b3682c>]
<class '_ast.Attribute'> attr 'name' col_offset 3 ctx <_ast.Load object at 0xb7bb2ccc> lineno 3 value <_ast.Name object at 0x9ccc46c>
<class '_ast.Name'> col_offset 3 ctx <_ast.Load object at 0xb7bb2ccc> id 'os' lineno 3
<class '_ast.Load'>
<class '_ast.Load'>
<class '_ast.NotEq'>
<class '_ast. ...

>>> ## reverse compile ast back to source
>>> source_code2 = Ast2Src.unparse(ast_tree1)
>>> print( '\n' + re.sub('\n+', '\n', source_code1[:1024]) + '...' )

## import ast2src; reload(ast2src); from ast2src import *
import os, sys
if os.name != 'posix': sys.stderr.write('\nast2src requires linux os\n\n'); exit()
if sys.version_info[:2] != (3, 1): sys.stderr.write('\nast2src requires python3.1\n\n'); exit()
if 1: ###### INIT
import ast2src as _MODULE
if '_SETUP' not in globals(): _SETUP = sys.modules.get('ast2src.setup', None)
def closure(*args, **kwds): return lambda fnc: fnc(*args, **kwds)
def identity(aa): return aa
def _import(ss, globals = globals()):
for aa in ss.split(' '): globals[aa] = __import__(aa)
return identity
class Namespace(object):
def __init__(self, **kwds): vars(self).update(kwds)
@_import('ast builtins collections re ' #### pseudosugar compiler
'imp importlib importlib.abc importlib.util ' #### import hook
'locale') ## PYTHON BUG
class PseudoSugar(ast.NodeVisitor, importlib.abc.Finder, importlib.abc.PyLoader):
## convenience function
@staticmethod
def exec(ss, globa...

>>> ## recompile reverse-compiled source
>>> ast_tree2 = compile(source_code2, '', 'exec', ast.PyCF_ONLY_AST)
>>> print( Ast2Src.debugnode(ast_tree2)[:1024], '...' )
<class '_ast.Module'> body [<_ast.Import object at 0x9ad7ecc>, <_ast.If object at 0x9b3316c>, <_ast.If object at 0x9b3abcc>, <_ast.If object at 0x9b3ae6c>]
<class '_ast.Import'> col_offset 0 lineno 2 names [<_ast.alias object at 0x9c2966c>, <_ast.alias object at 0x9c022ec>]
<class '_ast.alias'> asname None name 'os'
<class '_ast.alias'> asname None name 'sys'
<class '_ast.If'> body [<_ast.Expr object at 0x9b3aaac>, <_ast.Expr object at 0x9b3ab6c>] col_offset 0 lineno 3 orelse [] test <_ast.Compare object at 0x9b332ac>
<class '_ast.Compare'> col_offset 4 comparators [<_ast.Str object at 0x9b3a80c>] left <_ast.Attribute object at 0x9b3490c> lineno 3 ops [<_ast.NotEq object at 0xb7b3682c>]
<class '_ast.Attribute'> attr 'name' col_offset 4 ctx <_ast.Load object at 0xb7bb2ccc> lineno 3 value <_ast.Name object at 0x9b3a10c>
<class '_ast.Name'> col_offset 4 ctx <_ast.Load object at 0xb7bb2ccc> id 'os' lineno 3
<class '_ast.Load'>
<class '_ast.Load'>
<class '_ast.NotEq'>
<class '_ast. ...