/usr/lib/python3/dist-packages/_pytest/assertion/rewrite.py is in python3-pytest 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import ast
import errno
import itertools
import imp
import marshal
import os
import re
import struct
import sys
import types
import py
from _pytest.assertion import util
# py.test caches rewritten pycs in __pycache__.
if hasattr(imp, "get_tag"):
PYTEST_TAG = imp.get_tag() + "-PYTEST"
else:
if hasattr(sys, "pypy_version_info"):
impl = "pypy"
elif sys.platform == "java":
impl = "jython"
else:
impl = "cpython"
ver = sys.version_info
PYTEST_TAG = "%s-%s%s-PYTEST" % (impl, ver[0], ver[1])
del ver, impl
PYC_EXT = ".py" + (__debug__ and "c" or "o")
PYC_TAIL = "." + PYTEST_TAG + PYC_EXT
REWRITE_NEWLINES = sys.version_info[:2] != (2, 7) and sys.version_info < (3, 2)
ASCII_IS_DEFAULT_ENCODING = sys.version_info[0] < 3
class AssertionRewritingHook(object):
"""PEP302 Import hook which rewrites asserts."""
def __init__(self):
self.session = None
self.modules = {}
self._register_with_pkg_resources()
def set_session(self, session):
self.fnpats = session.config.getini("python_files")
self.session = session
def find_module(self, name, path=None):
if self.session is None:
return None
sess = self.session
state = sess.config._assertstate
state.trace("find_module called for: %s" % name)
names = name.rsplit(".", 1)
lastname = names[-1]
pth = None
if path is not None:
# Starting with Python 3.3, path is a _NamespacePath(), which
# causes problems if not converted to list.
path = list(path)
if len(path) == 1:
pth = path[0]
if pth is None:
try:
fd, fn, desc = imp.find_module(lastname, path)
except ImportError:
return None
if fd is not None:
fd.close()
tp = desc[2]
if tp == imp.PY_COMPILED:
if hasattr(imp, "source_from_cache"):
fn = imp.source_from_cache(fn)
else:
fn = fn[:-1]
elif tp != imp.PY_SOURCE:
# Don't know what this is.
return None
else:
fn = os.path.join(pth, name.rpartition(".")[2] + ".py")
fn_pypath = py.path.local(fn)
# Is this a test file?
if not sess.isinitpath(fn):
# We have to be very careful here because imports in this code can
# trigger a cycle.
self.session = None
try:
for pat in self.fnpats:
if fn_pypath.fnmatch(pat):
state.trace("matched test file %r" % (fn,))
break
else:
return None
finally:
self.session = sess
else:
state.trace("matched test file (was specified on cmdline): %r" %
(fn,))
# The requested module looks like a test file, so rewrite it. This is
# the most magical part of the process: load the source, rewrite the
# asserts, and load the rewritten source. We also cache the rewritten
# module code in a special pyc. We must be aware of the possibility of
# concurrent py.test processes rewriting and loading pycs. To avoid
# tricky race conditions, we maintain the following invariant: The
# cached pyc is always a complete, valid pyc. Operations on it must be
# atomic. POSIX's atomic rename comes in handy.
write = not sys.dont_write_bytecode
cache_dir = os.path.join(fn_pypath.dirname, "__pycache__")
if write:
try:
os.mkdir(cache_dir)
except OSError:
e = sys.exc_info()[1].errno
if e == errno.EEXIST:
# Either the __pycache__ directory already exists (the
# common case) or it's blocked by a non-dir node. In the
# latter case, we'll ignore it in _write_pyc.
pass
elif e in [errno.ENOENT, errno.ENOTDIR]:
# One of the path components was not a directory, likely
# because we're in a zip file.
write = False
elif e == errno.EACCES:
state.trace("read only directory: %r" % fn_pypath.dirname)
write = False
else:
raise
cache_name = fn_pypath.basename[:-3] + PYC_TAIL
pyc = os.path.join(cache_dir, cache_name)
# Notice that even if we're in a read-only directory, I'm going
# to check for a cached pyc. This may not be optimal...
co = _read_pyc(fn_pypath, pyc)
if co is None:
state.trace("rewriting %r" % (fn,))
co = _rewrite_test(state, fn_pypath)
if co is None:
# Probably a SyntaxError in the test.
return None
if write:
_make_rewritten_pyc(state, fn_pypath, pyc, co)
else:
state.trace("found cached rewritten pyc for %r" % (fn,))
self.modules[name] = co, pyc
return self
def load_module(self, name):
co, pyc = self.modules.pop(name)
# I wish I could just call imp.load_compiled here, but __file__ has to
# be set properly. In Python 3.2+, this all would be handled correctly
# by load_compiled.
mod = sys.modules[name] = imp.new_module(name)
try:
mod.__file__ = co.co_filename
# Normally, this attribute is 3.2+.
mod.__cached__ = pyc
mod.__loader__ = self
py.builtin.exec_(co, mod.__dict__)
except:
del sys.modules[name]
raise
return sys.modules[name]
def is_package(self, name):
try:
fd, fn, desc = imp.find_module(name)
except ImportError:
return False
if fd is not None:
fd.close()
tp = desc[2]
return tp == imp.PKG_DIRECTORY
@classmethod
def _register_with_pkg_resources(cls):
"""
Ensure package resources can be loaded from this loader. May be called
multiple times, as the operation is idempotent.
"""
try:
import pkg_resources
# access an attribute in case a deferred importer is present
pkg_resources.__name__
except ImportError:
return
# Since pytest tests are always located in the file system, the
# DefaultProvider is appropriate.
pkg_resources.register_loader_type(cls, pkg_resources.DefaultProvider)
def _write_pyc(state, co, source_path, pyc):
# Technically, we don't have to have the same pyc format as
# (C)Python, since these "pycs" should never be seen by builtin
# import. However, there's little reason deviate, and I hope
# sometime to be able to use imp.load_compiled to load them. (See
# the comment in load_module above.)
mtime = int(source_path.mtime())
try:
fp = open(pyc, "wb")
except IOError:
err = sys.exc_info()[1].errno
state.trace("error writing pyc file at %s: errno=%s" %(pyc, err))
# we ignore any failure to write the cache file
# there are many reasons, permission-denied, __pycache__ being a
# file etc.
return False
try:
fp.write(imp.get_magic())
fp.write(struct.pack("<l", mtime))
marshal.dump(co, fp)
finally:
fp.close()
return True
RN = "\r\n".encode("utf-8")
N = "\n".encode("utf-8")
cookie_re = re.compile(r"^[ \t\f]*#.*coding[:=][ \t]*[-\w.]+")
BOM_UTF8 = '\xef\xbb\xbf'
def _rewrite_test(state, fn):
"""Try to read and rewrite *fn* and return the code object."""
try:
source = fn.read("rb")
except EnvironmentError:
return None
if ASCII_IS_DEFAULT_ENCODING:
# ASCII is the default encoding in Python 2. Without a coding
# declaration, Python 2 will complain about any bytes in the file
# outside the ASCII range. Sadly, this behavior does not extend to
# compile() or ast.parse(), which prefer to interpret the bytes as
# latin-1. (At least they properly handle explicit coding cookies.) To
# preserve this error behavior, we could force ast.parse() to use ASCII
# as the encoding by inserting a coding cookie. Unfortunately, that
# messes up line numbers. Thus, we have to check ourselves if anything
# is outside the ASCII range in the case no encoding is explicitly
# declared. For more context, see issue #269. Yay for Python 3 which
# gets this right.
end1 = source.find("\n")
end2 = source.find("\n", end1 + 1)
if (not source.startswith(BOM_UTF8) and
cookie_re.match(source[0:end1]) is None and
cookie_re.match(source[end1 + 1:end2]) is None):
if hasattr(state, "_indecode"):
return None # encodings imported us again, we don't rewrite
state._indecode = True
try:
try:
source.decode("ascii")
except UnicodeDecodeError:
# Let it fail in real import.
return None
finally:
del state._indecode
# On Python versions which are not 2.7 and less than or equal to 3.1, the
# parser expects *nix newlines.
if REWRITE_NEWLINES:
source = source.replace(RN, N) + N
try:
tree = ast.parse(source)
except SyntaxError:
# Let this pop up again in the real import.
state.trace("failed to parse: %r" % (fn,))
return None
rewrite_asserts(tree)
try:
co = compile(tree, fn.strpath, "exec")
except SyntaxError:
# It's possible that this error is from some bug in the
# assertion rewriting, but I don't know of a fast way to tell.
state.trace("failed to compile: %r" % (fn,))
return None
return co
def _make_rewritten_pyc(state, fn, pyc, co):
"""Try to dump rewritten code to *pyc*."""
if sys.platform.startswith("win"):
# Windows grants exclusive access to open files and doesn't have atomic
# rename, so just write into the final file.
_write_pyc(state, co, fn, pyc)
else:
# When not on windows, assume rename is atomic. Dump the code object
# into a file specific to this process and atomically replace it.
proc_pyc = pyc + "." + str(os.getpid())
if _write_pyc(state, co, fn, proc_pyc):
os.rename(proc_pyc, pyc)
def _read_pyc(source, pyc):
"""Possibly read a py.test pyc containing rewritten code.
Return rewritten code if successful or None if not.
"""
try:
fp = open(pyc, "rb")
except IOError:
return None
try:
try:
mtime = int(source.mtime())
data = fp.read(8)
except EnvironmentError:
return None
# Check for invalid or out of date pyc file.
if (len(data) != 8 or data[:4] != imp.get_magic() or
struct.unpack("<l", data[4:])[0] != mtime):
return None
co = marshal.load(fp)
if not isinstance(co, types.CodeType):
# That's interesting....
return None
return co
finally:
fp.close()
def rewrite_asserts(mod):
"""Rewrite the assert statements in mod."""
AssertionRewriter().run(mod)
_saferepr = py.io.saferepr
from _pytest.assertion.util import format_explanation as _format_explanation # noqa
def _should_repr_global_name(obj):
return not hasattr(obj, "__name__") and not py.builtin.callable(obj)
def _format_boolop(explanations, is_or):
return "(" + (is_or and " or " or " and ").join(explanations) + ")"
def _call_reprcompare(ops, results, expls, each_obj):
for i, res, expl in zip(range(len(ops)), results, expls):
try:
done = not res
except Exception:
done = True
if done:
break
if util._reprcompare is not None:
custom = util._reprcompare(ops[i], each_obj[i], each_obj[i + 1])
if custom is not None:
return custom
return expl
unary_map = {
ast.Not: "not %s",
ast.Invert: "~%s",
ast.USub: "-%s",
ast.UAdd: "+%s"
}
binop_map = {
ast.BitOr: "|",
ast.BitXor: "^",
ast.BitAnd: "&",
ast.LShift: "<<",
ast.RShift: ">>",
ast.Add: "+",
ast.Sub: "-",
ast.Mult: "*",
ast.Div: "/",
ast.FloorDiv: "//",
ast.Mod: "%%", # escaped for string formatting
ast.Eq: "==",
ast.NotEq: "!=",
ast.Lt: "<",
ast.LtE: "<=",
ast.Gt: ">",
ast.GtE: ">=",
ast.Pow: "**",
ast.Is: "is",
ast.IsNot: "is not",
ast.In: "in",
ast.NotIn: "not in"
}
def set_location(node, lineno, col_offset):
"""Set node location information recursively."""
def _fix(node, lineno, col_offset):
if "lineno" in node._attributes:
node.lineno = lineno
if "col_offset" in node._attributes:
node.col_offset = col_offset
for child in ast.iter_child_nodes(node):
_fix(child, lineno, col_offset)
_fix(node, lineno, col_offset)
return node
class AssertionRewriter(ast.NodeVisitor):
def run(self, mod):
"""Find all assert statements in *mod* and rewrite them."""
if not mod.body:
# Nothing to do.
return
# Insert some special imports at the top of the module but after any
# docstrings and __future__ imports.
aliases = [ast.alias(py.builtin.builtins.__name__, "@py_builtins"),
ast.alias("_pytest.assertion.rewrite", "@pytest_ar")]
expect_docstring = True
pos = 0
lineno = 0
for item in mod.body:
if (expect_docstring and isinstance(item, ast.Expr) and
isinstance(item.value, ast.Str)):
doc = item.value.s
if "PYTEST_DONT_REWRITE" in doc:
# The module has disabled assertion rewriting.
return
lineno += len(doc) - 1
expect_docstring = False
elif (not isinstance(item, ast.ImportFrom) or item.level > 0 or
item.module != "__future__"):
lineno = item.lineno
break
pos += 1
imports = [ast.Import([alias], lineno=lineno, col_offset=0)
for alias in aliases]
mod.body[pos:pos] = imports
# Collect asserts.
nodes = [mod]
while nodes:
node = nodes.pop()
for name, field in ast.iter_fields(node):
if isinstance(field, list):
new = []
for i, child in enumerate(field):
if isinstance(child, ast.Assert):
# Transform assert.
new.extend(self.visit(child))
else:
new.append(child)
if isinstance(child, ast.AST):
nodes.append(child)
setattr(node, name, new)
elif (isinstance(field, ast.AST) and
# Don't recurse into expressions as they can't contain
# asserts.
not isinstance(field, ast.expr)):
nodes.append(field)
def variable(self):
"""Get a new variable."""
# Use a character invalid in python identifiers to avoid clashing.
name = "@py_assert" + str(next(self.variable_counter))
self.variables.append(name)
return name
def assign(self, expr):
"""Give *expr* a name."""
name = self.variable()
self.statements.append(ast.Assign([ast.Name(name, ast.Store())], expr))
return ast.Name(name, ast.Load())
def display(self, expr):
"""Call py.io.saferepr on the expression."""
return self.helper("saferepr", expr)
def helper(self, name, *args):
"""Call a helper in this module."""
py_name = ast.Name("@pytest_ar", ast.Load())
attr = ast.Attribute(py_name, "_" + name, ast.Load())
return ast.Call(attr, list(args), [], None, None)
def builtin(self, name):
"""Return the builtin called *name*."""
builtin_name = ast.Name("@py_builtins", ast.Load())
return ast.Attribute(builtin_name, name, ast.Load())
def explanation_param(self, expr):
specifier = "py" + str(next(self.variable_counter))
self.explanation_specifiers[specifier] = expr
return "%(" + specifier + ")s"
def push_format_context(self):
self.explanation_specifiers = {}
self.stack.append(self.explanation_specifiers)
def pop_format_context(self, expl_expr):
current = self.stack.pop()
if self.stack:
self.explanation_specifiers = self.stack[-1]
keys = [ast.Str(key) for key in current.keys()]
format_dict = ast.Dict(keys, list(current.values()))
form = ast.BinOp(expl_expr, ast.Mod(), format_dict)
name = "@py_format" + str(next(self.variable_counter))
self.on_failure.append(ast.Assign([ast.Name(name, ast.Store())], form))
return ast.Name(name, ast.Load())
def generic_visit(self, node):
"""Handle expressions we don't have custom code for."""
assert isinstance(node, ast.expr)
res = self.assign(node)
return res, self.explanation_param(self.display(res))
def visit_Assert(self, assert_):
if assert_.msg:
# There's already a message. Don't mess with it.
return [assert_]
self.statements = []
self.cond_chain = ()
self.variables = []
self.variable_counter = itertools.count()
self.stack = []
self.on_failure = []
self.push_format_context()
# Rewrite assert into a bunch of statements.
top_condition, explanation = self.visit(assert_.test)
# Create failure message.
body = self.on_failure
negation = ast.UnaryOp(ast.Not(), top_condition)
self.statements.append(ast.If(negation, body, []))
explanation = "assert " + explanation
template = ast.Str(explanation)
msg = self.pop_format_context(template)
fmt = self.helper("format_explanation", msg)
err_name = ast.Name("AssertionError", ast.Load())
exc = ast.Call(err_name, [fmt], [], None, None)
if sys.version_info[0] >= 3:
raise_ = ast.Raise(exc, None)
else:
raise_ = ast.Raise(exc, None, None)
body.append(raise_)
# Clear temporary variables by setting them to None.
if self.variables:
variables = [ast.Name(name, ast.Store())
for name in self.variables]
clear = ast.Assign(variables, ast.Name("None", ast.Load()))
self.statements.append(clear)
# Fix line numbers.
for stmt in self.statements:
set_location(stmt, assert_.lineno, assert_.col_offset)
return self.statements
def visit_Name(self, name):
# Display the repr of the name if it's a local variable or
# _should_repr_global_name() thinks it's acceptable.
locs = ast.Call(self.builtin("locals"), [], [], None, None)
inlocs = ast.Compare(ast.Str(name.id), [ast.In()], [locs])
dorepr = self.helper("should_repr_global_name", name)
test = ast.BoolOp(ast.Or(), [inlocs, dorepr])
expr = ast.IfExp(test, self.display(name), ast.Str(name.id))
return name, self.explanation_param(expr)
def visit_BoolOp(self, boolop):
res_var = self.variable()
expl_list = self.assign(ast.List([], ast.Load()))
app = ast.Attribute(expl_list, "append", ast.Load())
is_or = int(isinstance(boolop.op, ast.Or))
body = save = self.statements
fail_save = self.on_failure
levels = len(boolop.values) - 1
self.push_format_context()
# Process each operand, short-circuting if needed.
for i, v in enumerate(boolop.values):
if i:
fail_inner = []
# cond is set in a prior loop iteration below
self.on_failure.append(ast.If(cond, fail_inner, [])) # noqa
self.on_failure = fail_inner
self.push_format_context()
res, expl = self.visit(v)
body.append(ast.Assign([ast.Name(res_var, ast.Store())], res))
expl_format = self.pop_format_context(ast.Str(expl))
call = ast.Call(app, [expl_format], [], None, None)
self.on_failure.append(ast.Expr(call))
if i < levels:
cond = res
if is_or:
cond = ast.UnaryOp(ast.Not(), cond)
inner = []
self.statements.append(ast.If(cond, inner, []))
self.statements = body = inner
self.statements = save
self.on_failure = fail_save
expl_template = self.helper("format_boolop", expl_list, ast.Num(is_or))
expl = self.pop_format_context(expl_template)
return ast.Name(res_var, ast.Load()), self.explanation_param(expl)
def visit_UnaryOp(self, unary):
pattern = unary_map[unary.op.__class__]
operand_res, operand_expl = self.visit(unary.operand)
res = self.assign(ast.UnaryOp(unary.op, operand_res))
return res, pattern % (operand_expl,)
def visit_BinOp(self, binop):
symbol = binop_map[binop.op.__class__]
left_expr, left_expl = self.visit(binop.left)
right_expr, right_expl = self.visit(binop.right)
explanation = "(%s %s %s)" % (left_expl, symbol, right_expl)
res = self.assign(ast.BinOp(left_expr, binop.op, right_expr))
return res, explanation
def visit_Call(self, call):
new_func, func_expl = self.visit(call.func)
arg_expls = []
new_args = []
new_kwargs = []
new_star = new_kwarg = None
for arg in call.args:
res, expl = self.visit(arg)
new_args.append(res)
arg_expls.append(expl)
for keyword in call.keywords:
res, expl = self.visit(keyword.value)
new_kwargs.append(ast.keyword(keyword.arg, res))
arg_expls.append(keyword.arg + "=" + expl)
if call.starargs:
new_star, expl = self.visit(call.starargs)
arg_expls.append("*" + expl)
if call.kwargs:
new_kwarg, expl = self.visit(call.kwargs)
arg_expls.append("**" + expl)
expl = "%s(%s)" % (func_expl, ', '.join(arg_expls))
new_call = ast.Call(new_func, new_args, new_kwargs,
new_star, new_kwarg)
res = self.assign(new_call)
res_expl = self.explanation_param(self.display(res))
outer_expl = "%s\n{%s = %s\n}" % (res_expl, res_expl, expl)
return res, outer_expl
def visit_Attribute(self, attr):
if not isinstance(attr.ctx, ast.Load):
return self.generic_visit(attr)
value, value_expl = self.visit(attr.value)
res = self.assign(ast.Attribute(value, attr.attr, ast.Load()))
res_expl = self.explanation_param(self.display(res))
pat = "%s\n{%s = %s.%s\n}"
expl = pat % (res_expl, res_expl, value_expl, attr.attr)
return res, expl
def visit_Compare(self, comp):
self.push_format_context()
left_res, left_expl = self.visit(comp.left)
res_variables = [self.variable() for i in range(len(comp.ops))]
load_names = [ast.Name(v, ast.Load()) for v in res_variables]
store_names = [ast.Name(v, ast.Store()) for v in res_variables]
it = zip(range(len(comp.ops)), comp.ops, comp.comparators)
expls = []
syms = []
results = [left_res]
for i, op, next_operand in it:
next_res, next_expl = self.visit(next_operand)
results.append(next_res)
sym = binop_map[op.__class__]
syms.append(ast.Str(sym))
expl = "%s %s %s" % (left_expl, sym, next_expl)
expls.append(ast.Str(expl))
res_expr = ast.Compare(left_res, [op], [next_res])
self.statements.append(ast.Assign([store_names[i]], res_expr))
left_res, left_expl = next_res, next_expl
# Use pytest.assertion.util._reprcompare if that's available.
expl_call = self.helper("call_reprcompare",
ast.Tuple(syms, ast.Load()),
ast.Tuple(load_names, ast.Load()),
ast.Tuple(expls, ast.Load()),
ast.Tuple(results, ast.Load()))
if len(comp.ops) > 1:
res = ast.BoolOp(ast.And(), load_names)
else:
res = load_names[0]
return res, self.explanation_param(self.pop_format_context(expl_call))
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