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"Usage: unparse.py <path to source file>"
import sys
import ast
import cStringIO
import os
# Large float and imaginary literals get turned into infinities in the AST.
# We unparse those infinities to INFSTR.
INFSTR = "1e" + repr(sys.float_info.max_10_exp + 1)
def interleave(inter, f, seq):
"""Call f on each item in seq, calling inter() in between.
"""
seq = iter(seq)
try:
f(next(seq))
except StopIteration:
pass
else:
for x in seq:
inter()
f(x)
class Unparser:
"""Methods in this class recursively traverse an AST and
output source code for the abstract syntax; original formatting
is disregarded. """
def __init__(self, tree, file = sys.stdout):
"""Unparser(tree, file=sys.stdout) -> None.
Print the source for tree to file."""
self.f = file
self.future_imports = []
self._indent = 0
self.dispatch(tree)
self.f.write("")
self.f.flush()
def fill(self, text = ""):
"Indent a piece of text, according to the current indentation level"
self.f.write("\n"+" "*self._indent + text)
def write(self, text):
"Append a piece of text to the current line."
self.f.write(text)
def enter(self):
"Print ':', and increase the indentation."
self.write(":")
self._indent += 1
def leave(self):
"Decrease the indentation level."
self._indent -= 1
def dispatch(self, tree):
"Dispatcher function, dispatching tree type T to method _T."
if isinstance(tree, list):
for t in tree:
self.dispatch(t)
return
meth = getattr(self, "_"+tree.__class__.__name__)
meth(tree)
############### Unparsing methods ######################
# There should be one method per concrete grammar type #
# Constructors should be grouped by sum type. Ideally, #
# this would follow the order in the grammar, but #
# currently doesn't. #
########################################################
def _Module(self, tree):
for stmt in tree.body:
self.dispatch(stmt)
# stmt
def _Expr(self, tree):
self.fill()
self.dispatch(tree.value)
def _Import(self, t):
self.fill("import ")
interleave(lambda: self.write(", "), self.dispatch, t.names)
def _ImportFrom(self, t):
# A from __future__ import may affect unparsing, so record it.
if t.module and t.module == '__future__':
self.future_imports.extend(n.name for n in t.names)
self.fill("from ")
self.write("." * t.level)
if t.module:
self.write(t.module)
self.write(" import ")
interleave(lambda: self.write(", "), self.dispatch, t.names)
def _Assign(self, t):
self.fill()
for target in t.targets:
self.dispatch(target)
self.write(" = ")
self.dispatch(t.value)
def _AugAssign(self, t):
self.fill()
self.dispatch(t.target)
self.write(" "+self.binop[t.op.__class__.__name__]+"= ")
self.dispatch(t.value)
def _Return(self, t):
self.fill("return")
if t.value:
self.write(" ")
self.dispatch(t.value)
def _Pass(self, t):
self.fill("pass")
def _Break(self, t):
self.fill("break")
def _Continue(self, t):
self.fill("continue")
def _Delete(self, t):
self.fill("del ")
interleave(lambda: self.write(", "), self.dispatch, t.targets)
def _Assert(self, t):
self.fill("assert ")
self.dispatch(t.test)
if t.msg:
self.write(", ")
self.dispatch(t.msg)
def _Exec(self, t):
self.fill("exec ")
self.dispatch(t.body)
if t.globals:
self.write(" in ")
self.dispatch(t.globals)
if t.locals:
self.write(", ")
self.dispatch(t.locals)
def _Print(self, t):
self.fill("print ")
do_comma = False
if t.dest:
self.write(">>")
self.dispatch(t.dest)
do_comma = True
for e in t.values:
if do_comma:self.write(", ")
else:do_comma=True
self.dispatch(e)
if not t.nl:
self.write(",")
def _Global(self, t):
self.fill("global ")
interleave(lambda: self.write(", "), self.write, t.names)
def _Yield(self, t):
self.write("(")
self.write("yield")
if t.value:
self.write(" ")
self.dispatch(t.value)
self.write(")")
def _Raise(self, t):
self.fill('raise ')
if t.type:
self.dispatch(t.type)
if t.inst:
self.write(", ")
self.dispatch(t.inst)
if t.tback:
self.write(", ")
self.dispatch(t.tback)
def _TryExcept(self, t):
self.fill("try")
self.enter()
self.dispatch(t.body)
self.leave()
for ex in t.handlers:
self.dispatch(ex)
if t.orelse:
self.fill("else")
self.enter()
self.dispatch(t.orelse)
self.leave()
def _TryFinally(self, t):
if len(t.body) == 1 and isinstance(t.body[0], ast.TryExcept):
# try-except-finally
self.dispatch(t.body)
else:
self.fill("try")
self.enter()
self.dispatch(t.body)
self.leave()
self.fill("finally")
self.enter()
self.dispatch(t.finalbody)
self.leave()
def _ExceptHandler(self, t):
self.fill("except")
if t.type:
self.write(" ")
self.dispatch(t.type)
if t.name:
self.write(" as ")
self.dispatch(t.name)
self.enter()
self.dispatch(t.body)
self.leave()
def _ClassDef(self, t):
self.write("\n")
for deco in t.decorator_list:
self.fill("@")
self.dispatch(deco)
self.fill("class "+t.name)
if t.bases:
self.write("(")
for a in t.bases:
self.dispatch(a)
self.write(", ")
self.write(")")
self.enter()
self.dispatch(t.body)
self.leave()
def _FunctionDef(self, t):
self.write("\n")
for deco in t.decorator_list:
self.fill("@")
self.dispatch(deco)
self.fill("def "+t.name + "(")
self.dispatch(t.args)
self.write(")")
self.enter()
self.dispatch(t.body)
self.leave()
def _For(self, t):
self.fill("for ")
self.dispatch(t.target)
self.write(" in ")
self.dispatch(t.iter)
self.enter()
self.dispatch(t.body)
self.leave()
if t.orelse:
self.fill("else")
self.enter()
self.dispatch(t.orelse)
self.leave()
def _If(self, t):
self.fill("if ")
self.dispatch(t.test)
self.enter()
self.dispatch(t.body)
self.leave()
# collapse nested ifs into equivalent elifs.
while (t.orelse and len(t.orelse) == 1 and
isinstance(t.orelse[0], ast.If)):
t = t.orelse[0]
self.fill("elif ")
self.dispatch(t.test)
self.enter()
self.dispatch(t.body)
self.leave()
# final else
if t.orelse:
self.fill("else")
self.enter()
self.dispatch(t.orelse)
self.leave()
def _While(self, t):
self.fill("while ")
self.dispatch(t.test)
self.enter()
self.dispatch(t.body)
self.leave()
if t.orelse:
self.fill("else")
self.enter()
self.dispatch(t.orelse)
self.leave()
def _With(self, t):
self.fill("with ")
self.dispatch(t.context_expr)
if t.optional_vars:
self.write(" as ")
self.dispatch(t.optional_vars)
self.enter()
self.dispatch(t.body)
self.leave()
# expr
def _Str(self, tree):
# if from __future__ import unicode_literals is in effect,
# then we want to output string literals using a 'b' prefix
# and unicode literals with no prefix.
if "unicode_literals" not in self.future_imports:
self.write(repr(tree.s))
elif isinstance(tree.s, str):
self.write("b" + repr(tree.s))
elif isinstance(tree.s, unicode):
self.write(repr(tree.s).lstrip("u"))
else:
assert False, "shouldn't get here"
def _Name(self, t):
self.write(t.id)
def _Repr(self, t):
self.write("`")
self.dispatch(t.value)
self.write("`")
def _Num(self, t):
repr_n = repr(t.n)
# Parenthesize negative numbers, to avoid turning (-1)**2 into -1**2.
if repr_n.startswith("-"):
self.write("(")
# Substitute overflowing decimal literal for AST infinities.
self.write(repr_n.replace("inf", INFSTR))
if repr_n.startswith("-"):
self.write(")")
def _List(self, t):
self.write("[")
interleave(lambda: self.write(", "), self.dispatch, t.elts)
self.write("]")
def _ListComp(self, t):
self.write("[")
self.dispatch(t.elt)
for gen in t.generators:
self.dispatch(gen)
self.write("]")
def _GeneratorExp(self, t):
self.write("(")
self.dispatch(t.elt)
for gen in t.generators:
self.dispatch(gen)
self.write(")")
def _SetComp(self, t):
self.write("{")
self.dispatch(t.elt)
for gen in t.generators:
self.dispatch(gen)
self.write("}")
def _DictComp(self, t):
self.write("{")
self.dispatch(t.key)
self.write(": ")
self.dispatch(t.value)
for gen in t.generators:
self.dispatch(gen)
self.write("}")
def _comprehension(self, t):
self.write(" for ")
self.dispatch(t.target)
self.write(" in ")
self.dispatch(t.iter)
for if_clause in t.ifs:
self.write(" if ")
self.dispatch(if_clause)
def _IfExp(self, t):
self.write("(")
self.dispatch(t.body)
self.write(" if ")
self.dispatch(t.test)
self.write(" else ")
self.dispatch(t.orelse)
self.write(")")
def _Set(self, t):
assert(t.elts) # should be at least one element
self.write("{")
interleave(lambda: self.write(", "), self.dispatch, t.elts)
self.write("}")
def _Dict(self, t):
self.write("{")
def write_pair(pair):
(k, v) = pair
self.dispatch(k)
self.write(": ")
self.dispatch(v)
interleave(lambda: self.write(", "), write_pair, zip(t.keys, t.values))
self.write("}")
def _Tuple(self, t):
self.write("(")
if len(t.elts) == 1:
(elt,) = t.elts
self.dispatch(elt)
self.write(",")
else:
interleave(lambda: self.write(", "), self.dispatch, t.elts)
self.write(")")
unop = {"Invert":"~", "Not": "not", "UAdd":"+", "USub":"-"}
def _UnaryOp(self, t):
self.write("(")
self.write(self.unop[t.op.__class__.__name__])
self.write(" ")
# If we're applying unary minus to a number, parenthesize the number.
# This is necessary: -2147483648 is different from -(2147483648) on
# a 32-bit machine (the first is an int, the second a long), and
# -7j is different from -(7j). (The first has real part 0.0, the second
# has real part -0.0.)
if isinstance(t.op, ast.USub) and isinstance(t.operand, ast.Num):
self.write("(")
self.dispatch(t.operand)
self.write(")")
else:
self.dispatch(t.operand)
self.write(")")
binop = { "Add":"+", "Sub":"-", "Mult":"*", "Div":"/", "Mod":"%",
"LShift":"<<", "RShift":">>", "BitOr":"|", "BitXor":"^", "BitAnd":"&",
"FloorDiv":"//", "Pow": "**"}
def _BinOp(self, t):
self.write("(")
self.dispatch(t.left)
self.write(" " + self.binop[t.op.__class__.__name__] + " ")
self.dispatch(t.right)
self.write(")")
cmpops = {"Eq":"==", "NotEq":"!=", "Lt":"<", "LtE":"<=", "Gt":">", "GtE":">=",
"Is":"is", "IsNot":"is not", "In":"in", "NotIn":"not in"}
def _Compare(self, t):
self.write("(")
self.dispatch(t.left)
for o, e in zip(t.ops, t.comparators):
self.write(" " + self.cmpops[o.__class__.__name__] + " ")
self.dispatch(e)
self.write(")")
boolops = {ast.And: 'and', ast.Or: 'or'}
def _BoolOp(self, t):
self.write("(")
s = " %s " % self.boolops[t.op.__class__]
interleave(lambda: self.write(s), self.dispatch, t.values)
self.write(")")
def _Attribute(self,t):
self.dispatch(t.value)
# Special case: 3.__abs__() is a syntax error, so if t.value
# is an integer literal then we need to either parenthesize
# it or add an extra space to get 3 .__abs__().
if isinstance(t.value, ast.Num) and isinstance(t.value.n, int):
self.write(" ")
self.write(".")
self.write(t.attr)
def _Call(self, t):
self.dispatch(t.func)
self.write("(")
comma = False
for e in t.args:
if comma: self.write(", ")
else: comma = True
self.dispatch(e)
for e in t.keywords:
if comma: self.write(", ")
else: comma = True
self.dispatch(e)
if t.starargs:
if comma: self.write(", ")
else: comma = True
self.write("*")
self.dispatch(t.starargs)
if t.kwargs:
if comma: self.write(", ")
else: comma = True
self.write("**")
self.dispatch(t.kwargs)
self.write(")")
def _Subscript(self, t):
self.dispatch(t.value)
self.write("[")
self.dispatch(t.slice)
self.write("]")
# slice
def _Ellipsis(self, t):
self.write("...")
def _Index(self, t):
self.dispatch(t.value)
def _Slice(self, t):
if t.lower:
self.dispatch(t.lower)
self.write(":")
if t.upper:
self.dispatch(t.upper)
if t.step:
self.write(":")
self.dispatch(t.step)
def _ExtSlice(self, t):
interleave(lambda: self.write(', '), self.dispatch, t.dims)
# others
def _arguments(self, t):
first = True
# normal arguments
defaults = [None] * (len(t.args) - len(t.defaults)) + t.defaults
for a,d in zip(t.args, defaults):
if first:first = False
else: self.write(", ")
self.dispatch(a),
if d:
self.write("=")
self.dispatch(d)
# varargs
if t.vararg:
if first:first = False
else: self.write(", ")
self.write("*")
self.write(t.vararg)
# kwargs
if t.kwarg:
if first:first = False
else: self.write(", ")
self.write("**"+t.kwarg)
def _keyword(self, t):
self.write(t.arg)
self.write("=")
self.dispatch(t.value)
def _Lambda(self, t):
self.write("(")
self.write("lambda ")
self.dispatch(t.args)
self.write(": ")
self.dispatch(t.body)
self.write(")")
def _alias(self, t):
self.write(t.name)
if t.asname:
self.write(" as "+t.asname)
def roundtrip(filename, output=sys.stdout):
with open(filename, "r") as pyfile:
source = pyfile.read()
tree = compile(source, filename, "exec", ast.PyCF_ONLY_AST)
Unparser(tree, output)
def testdir(a):
try:
names = [n for n in os.listdir(a) if n.endswith('.py')]
except OSError:
sys.stderr.write("Directory not readable: %s" % a)
else:
for n in names:
fullname = os.path.join(a, n)
if os.path.isfile(fullname):
output = cStringIO.StringIO()
print 'Testing %s' % fullname
try:
roundtrip(fullname, output)
except Exception as e:
print ' Failed to compile, exception is %s' % repr(e)
elif os.path.isdir(fullname):
testdir(fullname)
def main(args):
if args[0] == '--testdir':
for a in args[1:]:
testdir(a)
else:
for a in args:
roundtrip(a)
if __name__=='__main__':
main(sys.argv[1:])