mirror of
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c4fe6f3961
svn+ssh://pythondev@svn.python.org/python/trunk ........ r65780 | antoine.pitrou | 2008-08-17 15:15:07 -0500 (Sun, 17 Aug 2008) | 3 lines #3580: fix a failure in test_os ........ r65782 | benjamin.peterson | 2008-08-17 15:33:45 -0500 (Sun, 17 Aug 2008) | 1 line set svn:executable on a script ........ r65785 | amaury.forgeotdarc | 2008-08-17 16:05:18 -0500 (Sun, 17 Aug 2008) | 3 lines Fix a refleak in bytearray.split and bytearray.rsplit, detected by regrtest.py -R:: test_bytes ........ r65809 | nick.coghlan | 2008-08-18 07:42:46 -0500 (Mon, 18 Aug 2008) | 1 line Belated NEWS entry for r65642 ........ r65812 | nick.coghlan | 2008-08-18 08:32:19 -0500 (Mon, 18 Aug 2008) | 1 line Fix typo ........ r65834 | amaury.forgeotdarc | 2008-08-18 14:23:47 -0500 (Mon, 18 Aug 2008) | 4 lines #2234 distutils failed with mingw binutils 2.18.50.20080109. Be less strict when parsing these version numbers, they don't necessarily follow the python numbering scheme. ........ r65846 | georg.brandl | 2008-08-18 18:09:49 -0500 (Mon, 18 Aug 2008) | 2 lines Fix grammar. ........ r65859 | thomas.heller | 2008-08-19 12:47:13 -0500 (Tue, 19 Aug 2008) | 2 lines Fix strange character in the docstring. ........ r65861 | benjamin.peterson | 2008-08-19 12:59:23 -0500 (Tue, 19 Aug 2008) | 1 line get unparse to at least unparse its self ........
509 lines
13 KiB
Python
509 lines
13 KiB
Python
"Usage: unparse.py <path to source file>"
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import sys
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import _ast
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import io
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import os
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def interleave(inter, f, seq):
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"""Call f on each item in seq, calling inter() in between.
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"""
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seq = iter(seq)
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try:
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f(next(seq))
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except StopIteration:
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pass
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else:
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for x in seq:
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inter()
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f(x)
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class Unparser:
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"""Methods in this class recursively traverse an AST and
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output source code for the abstract syntax; original formatting
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is disregarged. """
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def __init__(self, tree, file = sys.stdout):
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"""Unparser(tree, file=sys.stdout) -> None.
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Print the source for tree to file."""
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self.f = file
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self._indent = 0
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self.dispatch(tree)
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print("", file=self.f)
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self.f.flush()
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def fill(self, text = ""):
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"Indent a piece of text, according to the current indentation level"
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self.f.write("\n"+" "*self._indent + text)
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def write(self, text):
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"Append a piece of text to the current line."
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self.f.write(text)
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def enter(self):
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"Print ':', and increase the indentation."
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self.write(":")
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self._indent += 1
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def leave(self):
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"Decrease the indentation level."
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self._indent -= 1
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def dispatch(self, tree):
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"Dispatcher function, dispatching tree type T to method _T."
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if isinstance(tree, list):
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for t in tree:
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self.dispatch(t)
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return
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meth = getattr(self, "_"+tree.__class__.__name__)
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meth(tree)
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############### Unparsing methods ######################
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# There should be one method per concrete grammar type #
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# Constructors should be grouped by sum type. Ideally, #
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# this would follow the order in the grammar, but #
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# currently doesn't. #
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########################################################
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def _Module(self, tree):
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for stmt in tree.body:
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self.dispatch(stmt)
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# stmt
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def _Expr(self, tree):
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self.fill()
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self.dispatch(tree.value)
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def _Import(self, t):
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self.fill("import ")
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interleave(lambda: self.write(", "), self.dispatch, t.names)
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def _ImportFrom(self, t):
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self.fill("from ")
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self.write(t.module)
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self.write(" import ")
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interleave(lambda: self.write(", "), self.dispatch, t.names)
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# XXX(jpe) what is level for?
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def _Assign(self, t):
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self.fill()
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for target in t.targets:
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self.dispatch(target)
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self.write(" = ")
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self.dispatch(t.value)
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def _AugAssign(self, t):
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self.fill()
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self.dispatch(t.target)
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self.write(" "+self.binop[t.op.__class__.__name__]+"= ")
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self.dispatch(t.value)
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def _Return(self, t):
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self.fill("return")
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if t.value:
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self.write(" ")
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self.dispatch(t.value)
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def _Pass(self, t):
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self.fill("pass")
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def _Break(self, t):
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self.fill("break")
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def _Continue(self, t):
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self.fill("continue")
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def _Delete(self, t):
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self.fill("del ")
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self.dispatch(t.targets)
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def _Assert(self, t):
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self.fill("assert ")
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self.dispatch(t.test)
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if t.msg:
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self.write(", ")
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self.dispatch(t.msg)
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def _Print(self, t):
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self.fill("print ")
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do_comma = False
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if t.dest:
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self.write(">>")
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self.dispatch(t.dest)
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do_comma = True
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for e in t.values:
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if do_comma:self.write(", ")
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else:do_comma=True
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self.dispatch(e)
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if not t.nl:
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self.write(",")
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def _Global(self, t):
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self.fill("global ")
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interleave(lambda: self.write(", "), self.write, t.names)
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def _Yield(self, t):
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self.write("(")
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self.write("yield")
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if t.value:
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self.write(" ")
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self.dispatch(t.value)
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self.write(")")
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def _Raise(self, t):
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self.fill('raise ')
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if t.type:
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self.dispatch(t.type)
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if t.inst:
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self.write(", ")
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self.dispatch(t.inst)
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if t.tback:
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self.write(", ")
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self.dispatch(t.tback)
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def _TryExcept(self, t):
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self.fill("try")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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for ex in t.handlers:
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self.dispatch(ex)
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave()
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def _TryFinally(self, t):
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self.fill("try")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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self.fill("finally")
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self.enter()
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self.dispatch(t.finalbody)
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self.leave()
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def _ExceptHandler(self, t):
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self.fill("except")
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if t.type:
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self.write(" ")
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self.dispatch(t.type)
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if t.name:
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self.write(", ")
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self.dispatch(t.name)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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def _ClassDef(self, t):
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self.write("\n")
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self.fill("class "+t.name)
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if t.bases:
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self.write("(")
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for a in t.bases:
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self.dispatch(a)
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self.write(", ")
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self.write(")")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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def _FunctionDef(self, t):
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self.write("\n")
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for deco in t.decorator_list:
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self.fill("@")
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self.dispatch(deco)
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self.fill("def "+t.name + "(")
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self.dispatch(t.args)
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self.write(")")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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def _For(self, t):
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self.fill("for ")
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self.dispatch(t.target)
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self.write(" in ")
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self.dispatch(t.iter)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave
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def _If(self, t):
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self.fill("if ")
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self.dispatch(t.test)
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self.enter()
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# XXX elif?
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self.dispatch(t.body)
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self.leave()
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave()
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def _While(self, t):
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self.fill("while ")
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self.dispatch(t.test)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave
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def _With(self, t):
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self.fill("with ")
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self.dispatch(t.context_expr)
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if t.optional_vars:
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self.write(" as ")
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self.dispatch(t.optional_vars)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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# expr
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def _Str(self, tree):
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self.write(repr(tree.s))
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def _Name(self, t):
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self.write(t.id)
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def _Repr(self, t):
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self.write("`")
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self.dispatch(t.value)
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self.write("`")
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def _Num(self, t):
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self.write(repr(t.n))
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def _List(self, t):
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self.write("[")
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interleave(lambda: self.write(", "), self.dispatch, t.elts)
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self.write("]")
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def _ListComp(self, t):
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self.write("[")
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self.dispatch(t.elt)
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for gen in t.generators:
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self.dispatch(gen)
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self.write("]")
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def _GeneratorExp(self, t):
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self.write("(")
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self.dispatch(t.elt)
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for gen in t.generators:
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self.dispatch(gen)
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self.write(")")
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def _comprehension(self, t):
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self.write(" for ")
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self.dispatch(t.target)
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self.write(" in ")
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self.dispatch(t.iter)
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for if_clause in t.ifs:
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self.write(" if ")
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self.dispatch(if_clause)
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def _IfExp(self, t):
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self.write("(")
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self.dispatch(t.body)
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self.write(" if ")
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self.dispatch(t.test)
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self.write(" else ")
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self.dispatch(t.orelse)
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self.write(")")
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def _Dict(self, t):
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self.write("{")
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def writem(xxx_todo_changeme):
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(k, v) = xxx_todo_changeme
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self.dispatch(k)
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self.write(": ")
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self.dispatch(v)
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interleave(lambda: self.write(", "), writem, zip(t.keys, t.values))
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self.write("}")
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def _Tuple(self, t):
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self.write("(")
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if len(t.elts) == 1:
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(elt,) = t.elts
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self.dispatch(elt)
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self.write(",")
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else:
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interleave(lambda: self.write(", "), self.dispatch, t.elts)
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self.write(")")
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unop = {"Invert":"~", "Not": "not", "UAdd":"+", "USub":"-"}
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def _UnaryOp(self, t):
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self.write(self.unop[t.op.__class__.__name__])
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self.write("(")
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self.dispatch(t.operand)
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self.write(")")
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binop = { "Add":"+", "Sub":"-", "Mult":"*", "Div":"/", "Mod":"%",
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"LShift":">>", "RShift":"<<", "BitOr":"|", "BitXor":"^", "BitAnd":"&",
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"FloorDiv":"//", "Pow": "**"}
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def _BinOp(self, t):
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self.write("(")
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self.dispatch(t.left)
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self.write(" " + self.binop[t.op.__class__.__name__] + " ")
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self.dispatch(t.right)
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self.write(")")
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cmpops = {"Eq":"==", "NotEq":"!=", "Lt":"<", "LtE":"<=", "Gt":">", "GtE":">=",
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"Is":"is", "IsNot":"is not", "In":"in", "NotIn":"not in"}
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def _Compare(self, t):
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self.write("(")
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self.dispatch(t.left)
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for o, e in zip(t.ops, t.comparators):
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self.write(" " + self.cmpops[o.__class__.__name__] + " ")
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self.dispatch(e)
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self.write(")")
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boolops = {_ast.And: 'and', _ast.Or: 'or'}
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def _BoolOp(self, t):
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self.write("(")
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s = " %s " % self.boolops[t.op.__class__]
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interleave(lambda: self.write(s), self.dispatch, t.values)
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self.write(")")
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def _Attribute(self,t):
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self.dispatch(t.value)
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self.write(".")
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self.write(t.attr)
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def _Call(self, t):
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self.dispatch(t.func)
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self.write("(")
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comma = False
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for e in t.args:
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if comma: self.write(", ")
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else: comma = True
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self.dispatch(e)
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for e in t.keywords:
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if comma: self.write(", ")
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else: comma = True
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self.dispatch(e)
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if t.starargs:
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if comma: self.write(", ")
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else: comma = True
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self.write("*")
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self.dispatch(t.starargs)
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if t.kwargs:
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if comma: self.write(", ")
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else: comma = True
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self.write("**")
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self.dispatch(t.kwargs)
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self.write(")")
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def _Subscript(self, t):
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self.dispatch(t.value)
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self.write("[")
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self.dispatch(t.slice)
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self.write("]")
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# slice
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def _Ellipsis(self, t):
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self.write("...")
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def _Index(self, t):
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self.dispatch(t.value)
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def _Slice(self, t):
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if t.lower:
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self.dispatch(t.lower)
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self.write(":")
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if t.upper:
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self.dispatch(t.upper)
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if t.step:
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self.write(":")
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self.dispatch(t.step)
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def _ExtSlice(self, t):
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interleave(lambda: self.write(', '), self.dispatch, t.dims)
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# others
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def _arguments(self, t):
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first = True
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nonDef = len(t.args)-len(t.defaults)
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for a in t.args[0:nonDef]:
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if first:first = False
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else: self.write(", ")
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self.dispatch(a)
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for a,d in zip(t.args[nonDef:], t.defaults):
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if first:first = False
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else: self.write(", ")
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self.dispatch(a),
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self.write("=")
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self.dispatch(d)
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if t.vararg:
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if first:first = False
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else: self.write(", ")
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self.write("*"+t.vararg)
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if t.kwarg:
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if first:first = False
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else: self.write(", ")
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self.write("**"+t.kwarg)
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def _keyword(self, t):
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self.write(t.arg)
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self.write("=")
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self.dispatch(t.value)
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def _Lambda(self, t):
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self.write("lambda ")
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self.dispatch(t.args)
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self.write(": ")
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self.dispatch(t.body)
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def _alias(self, t):
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self.write(t.name)
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if t.asname:
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self.write(" as "+t.asname)
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def roundtrip(filename, output=sys.stdout):
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source = open(filename).read()
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tree = compile(source, filename, "exec", _ast.PyCF_ONLY_AST)
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Unparser(tree, output)
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def testdir(a):
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try:
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names = [n for n in os.listdir(a) if n.endswith('.py')]
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except OSError:
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print("Directory not readable: %s" % a, file=sys.stderr)
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else:
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for n in names:
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fullname = os.path.join(a, n)
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if os.path.isfile(fullname):
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output = io.StringIO()
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print('Testing %s' % fullname)
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try:
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roundtrip(fullname, output)
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except Exception as e:
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print(' Failed to compile, exception is %s' % repr(e))
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elif os.path.isdir(fullname):
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testdir(fullname)
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def main(args):
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if args[0] == '--testdir':
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for a in args[1:]:
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testdir(a)
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else:
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for a in args:
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roundtrip(a)
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if __name__=='__main__':
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main(sys.argv[1:])
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