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import py 

import sys 

from inspect import CO_VARARGS, CO_VARKEYWORDS, isclass 

 

builtin_repr = repr 

 

reprlib = py.builtin._tryimport('repr', 'reprlib') 

 

if sys.version_info[0] >= 3: 

from traceback import format_exception_only 

else: 

from py._code._py2traceback import format_exception_only 

 

import traceback 

 

 

class Code(object): 

""" wrapper around Python code objects """ 

def __init__(self, rawcode): 

if not hasattr(rawcode, "co_filename"): 

rawcode = py.code.getrawcode(rawcode) 

try: 

self.filename = rawcode.co_filename 

self.firstlineno = rawcode.co_firstlineno - 1 

self.name = rawcode.co_name 

except AttributeError: 

raise TypeError("not a code object: %r" % (rawcode,)) 

self.raw = rawcode 

 

def __eq__(self, other): 

return self.raw == other.raw 

 

def __ne__(self, other): 

return not self == other 

 

@property 

def path(self): 

""" return a path object pointing to source code (note that it 

might not point to an actually existing file). """ 

p = py.path.local(self.raw.co_filename) 

# maybe don't try this checking 

if not p.check(): 

# XXX maybe try harder like the weird logic 

# in the standard lib [linecache.updatecache] does? 

p = self.raw.co_filename 

return p 

 

@property 

def fullsource(self): 

""" return a py.code.Source object for the full source file of the code 

""" 

from py._code import source 

full, _ = source.findsource(self.raw) 

return full 

 

def source(self): 

""" return a py.code.Source object for the code object's source only 

""" 

# return source only for that part of code 

return py.code.Source(self.raw) 

 

def getargs(self, var=False): 

""" return a tuple with the argument names for the code object 

 

if 'var' is set True also return the names of the variable and 

keyword arguments when present 

""" 

# handfull shortcut for getting args 

raw = self.raw 

argcount = raw.co_argcount 

if var: 

argcount += raw.co_flags & CO_VARARGS 

argcount += raw.co_flags & CO_VARKEYWORDS 

return raw.co_varnames[:argcount] 

 

class Frame(object): 

"""Wrapper around a Python frame holding f_locals and f_globals 

in which expressions can be evaluated.""" 

 

def __init__(self, frame): 

self.lineno = frame.f_lineno - 1 

self.f_globals = frame.f_globals 

self.f_locals = frame.f_locals 

self.raw = frame 

self.code = py.code.Code(frame.f_code) 

 

@property 

def statement(self): 

""" statement this frame is at """ 

if self.code.fullsource is None: 

return py.code.Source("") 

return self.code.fullsource.getstatement(self.lineno) 

 

def eval(self, code, **vars): 

""" evaluate 'code' in the frame 

 

'vars' are optional additional local variables 

 

returns the result of the evaluation 

""" 

f_locals = self.f_locals.copy() 

f_locals.update(vars) 

return eval(code, self.f_globals, f_locals) 

 

def exec_(self, code, **vars): 

""" exec 'code' in the frame 

 

'vars' are optiona; additional local variables 

""" 

f_locals = self.f_locals.copy() 

f_locals.update(vars) 

py.builtin.exec_(code, self.f_globals, f_locals) 

 

def repr(self, object): 

""" return a 'safe' (non-recursive, one-line) string repr for 'object' 

""" 

return py.io.saferepr(object) 

 

def is_true(self, object): 

return object 

 

def getargs(self, var=False): 

""" return a list of tuples (name, value) for all arguments 

 

if 'var' is set True also include the variable and keyword 

arguments when present 

""" 

retval = [] 

for arg in self.code.getargs(var): 

try: 

retval.append((arg, self.f_locals[arg])) 

except KeyError: 

pass # this can occur when using Psyco 

return retval 

 

 

class TracebackEntry(object): 

""" a single entry in a traceback """ 

 

_repr_style = None 

exprinfo = None 

 

def __init__(self, rawentry): 

self._rawentry = rawentry 

self.lineno = rawentry.tb_lineno - 1 

 

def set_repr_style(self, mode): 

assert mode in ("short", "long") 

self._repr_style = mode 

 

@property 

def frame(self): 

return py.code.Frame(self._rawentry.tb_frame) 

 

@property 

def relline(self): 

return self.lineno - self.frame.code.firstlineno 

 

def __repr__(self): 

return "<TracebackEntry %s:%d>" % (self.frame.code.path, self.lineno+1) 

 

@property 

def statement(self): 

""" py.code.Source object for the current statement """ 

source = self.frame.code.fullsource 

return source.getstatement(self.lineno) 

 

@property 

def path(self): 

""" path to the source code """ 

return self.frame.code.path 

 

def getlocals(self): 

return self.frame.f_locals 

locals = property(getlocals, None, None, "locals of underlaying frame") 

 

def reinterpret(self): 

"""Reinterpret the failing statement and returns a detailed information 

about what operations are performed.""" 

if self.exprinfo is None: 

source = str(self.statement).strip() 

x = py.code._reinterpret(source, self.frame, should_fail=True) 

if not isinstance(x, str): 

raise TypeError("interpret returned non-string %r" % (x,)) 

self.exprinfo = x 

return self.exprinfo 

 

def getfirstlinesource(self): 

# on Jython this firstlineno can be -1 apparently 

return max(self.frame.code.firstlineno, 0) 

 

def getsource(self, astcache=None): 

""" return failing source code. """ 

# we use the passed in astcache to not reparse asttrees 

# within exception info printing 

from py._code.source import getstatementrange_ast 

source = self.frame.code.fullsource 

if source is None: 

return None 

key = astnode = None 

if astcache is not None: 

key = self.frame.code.path 

if key is not None: 

astnode = astcache.get(key, None) 

start = self.getfirstlinesource() 

try: 

astnode, _, end = getstatementrange_ast(self.lineno, source, 

astnode=astnode) 

except SyntaxError: 

end = self.lineno + 1 

else: 

if key is not None: 

astcache[key] = astnode 

return source[start:end] 

 

source = property(getsource) 

 

def ishidden(self): 

""" return True if the current frame has a var __tracebackhide__ 

resolving to True 

 

mostly for internal use 

""" 

try: 

return self.frame.f_locals['__tracebackhide__'] 

except KeyError: 

try: 

return self.frame.f_globals['__tracebackhide__'] 

except KeyError: 

return False 

 

def __str__(self): 

try: 

fn = str(self.path) 

except py.error.Error: 

fn = '???' 

name = self.frame.code.name 

try: 

line = str(self.statement).lstrip() 

except KeyboardInterrupt: 

raise 

except: 

line = "???" 

return " File %r:%d in %s\n %s\n" % (fn, self.lineno+1, name, line) 

 

def name(self): 

return self.frame.code.raw.co_name 

name = property(name, None, None, "co_name of underlaying code") 

 

 

class Traceback(list): 

""" Traceback objects encapsulate and offer higher level 

access to Traceback entries. 

""" 

Entry = TracebackEntry 

 

def __init__(self, tb): 

""" initialize from given python traceback object. """ 

if hasattr(tb, 'tb_next'): 

def f(cur): 

while cur is not None: 

yield self.Entry(cur) 

cur = cur.tb_next 

list.__init__(self, f(tb)) 

else: 

list.__init__(self, tb) 

 

def cut(self, path=None, lineno=None, firstlineno=None, excludepath=None): 

""" return a Traceback instance wrapping part of this Traceback 

 

by provding any combination of path, lineno and firstlineno, the 

first frame to start the to-be-returned traceback is determined 

 

this allows cutting the first part of a Traceback instance e.g. 

for formatting reasons (removing some uninteresting bits that deal 

with handling of the exception/traceback) 

""" 

for x in self: 

code = x.frame.code 

codepath = code.path 

if ((path is None or codepath == path) and 

(excludepath is None or not hasattr(codepath, 'relto') or 

not codepath.relto(excludepath)) and 

(lineno is None or x.lineno == lineno) and 

(firstlineno is None or x.frame.code.firstlineno == firstlineno)): 

return Traceback(x._rawentry) 

return self 

 

def __getitem__(self, key): 

val = super(Traceback, self).__getitem__(key) 

if isinstance(key, type(slice(0))): 

val = self.__class__(val) 

return val 

 

def filter(self, fn=lambda x: not x.ishidden()): 

""" return a Traceback instance with certain items removed 

 

fn is a function that gets a single argument, a TracebackItem 

instance, and should return True when the item should be added 

to the Traceback, False when not 

 

by default this removes all the TracebackItems which are hidden 

(see ishidden() above) 

""" 

return Traceback(filter(fn, self)) 

 

def getcrashentry(self): 

""" return last non-hidden traceback entry that lead 

to the exception of a traceback. 

""" 

for i in range(-1, -len(self)-1, -1): 

entry = self[i] 

if not entry.ishidden(): 

return entry 

return self[-1] 

 

def recursionindex(self): 

""" return the index of the frame/TracebackItem where recursion 

originates if appropriate, None if no recursion occurred 

""" 

cache = {} 

for i, entry in enumerate(self): 

# id for the code.raw is needed to work around 

# the strange metaprogramming in the decorator lib from pypi 

# which generates code objects that have hash/value equality 

#XXX needs a test 

key = entry.frame.code.path, id(entry.frame.code.raw), entry.lineno 

#print "checking for recursion at", key 

l = cache.setdefault(key, []) 

if l: 

f = entry.frame 

loc = f.f_locals 

for otherloc in l: 

if f.is_true(f.eval(co_equal, 

__recursioncache_locals_1=loc, 

__recursioncache_locals_2=otherloc)): 

return i 

l.append(entry.frame.f_locals) 

return None 

 

co_equal = compile('__recursioncache_locals_1 == __recursioncache_locals_2', 

'?', 'eval') 

 

class ExceptionInfo(object): 

""" wraps sys.exc_info() objects and offers 

help for navigating the traceback. 

""" 

_striptext = '' 

def __init__(self, tup=None, exprinfo=None): 

if tup is None: 

tup = sys.exc_info() 

if exprinfo is None and isinstance(tup[1], AssertionError): 

exprinfo = getattr(tup[1], 'msg', None) 

if exprinfo is None: 

exprinfo = str(tup[1]) 

if exprinfo and exprinfo.startswith('assert '): 

self._striptext = 'AssertionError: ' 

self._excinfo = tup 

#: the exception class 

self.type = tup[0] 

#: the exception instance 

self.value = tup[1] 

#: the exception raw traceback 

self.tb = tup[2] 

#: the exception type name 

self.typename = self.type.__name__ 

#: the exception traceback (py.code.Traceback instance) 

self.traceback = py.code.Traceback(self.tb) 

 

def __repr__(self): 

return "<ExceptionInfo %s tblen=%d>" % ( 

self.typename, len(self.traceback)) 

 

def exconly(self, tryshort=False): 

""" return the exception as a string 

 

when 'tryshort' resolves to True, and the exception is a 

py.code._AssertionError, only the actual exception part of 

the exception representation is returned (so 'AssertionError: ' is 

removed from the beginning) 

""" 

lines = format_exception_only(self.type, self.value) 

text = ''.join(lines) 

text = text.rstrip() 

if tryshort: 

if text.startswith(self._striptext): 

text = text[len(self._striptext):] 

return text 

 

def errisinstance(self, exc): 

""" return True if the exception is an instance of exc """ 

return isinstance(self.value, exc) 

 

def _getreprcrash(self): 

exconly = self.exconly(tryshort=True) 

entry = self.traceback.getcrashentry() 

path, lineno = entry.frame.code.raw.co_filename, entry.lineno 

return ReprFileLocation(path, lineno+1, exconly) 

 

def getrepr(self, showlocals=False, style="long", 

abspath=False, tbfilter=True, funcargs=False): 

""" return str()able representation of this exception info. 

showlocals: show locals per traceback entry 

style: long|short|no|native traceback style 

tbfilter: hide entries (where __tracebackhide__ is true) 

 

in case of style==native, tbfilter and showlocals is ignored. 

""" 

if style == 'native': 

return ReprExceptionInfo(ReprTracebackNative( 

traceback.format_exception( 

self.type, 

self.value, 

self.traceback[0]._rawentry, 

)), self._getreprcrash()) 

 

fmt = FormattedExcinfo( 

showlocals=showlocals, style=style, 

abspath=abspath, tbfilter=tbfilter, funcargs=funcargs) 

return fmt.repr_excinfo(self) 

 

def __str__(self): 

entry = self.traceback[-1] 

loc = ReprFileLocation(entry.path, entry.lineno + 1, self.exconly()) 

return str(loc) 

 

def __unicode__(self): 

entry = self.traceback[-1] 

loc = ReprFileLocation(entry.path, entry.lineno + 1, self.exconly()) 

return loc.__unicode__() 

 

 

class FormattedExcinfo(object): 

""" presenting information about failing Functions and Generators. """ 

# for traceback entries 

flow_marker = ">" 

fail_marker = "E" 

 

def __init__(self, showlocals=False, style="long", 

abspath=True, tbfilter=True, funcargs=False): 

self.showlocals = showlocals 

self.style = style 

self.tbfilter = tbfilter 

self.funcargs = funcargs 

self.abspath = abspath 

self.astcache = {} 

 

def _getindent(self, source): 

# figure out indent for given source 

try: 

s = str(source.getstatement(len(source)-1)) 

except KeyboardInterrupt: 

raise 

except: 

try: 

s = str(source[-1]) 

except KeyboardInterrupt: 

raise 

except: 

return 0 

return 4 + (len(s) - len(s.lstrip())) 

 

def _getentrysource(self, entry): 

source = entry.getsource(self.astcache) 

if source is not None: 

source = source.deindent() 

return source 

 

def _saferepr(self, obj): 

return py.io.saferepr(obj) 

 

def repr_args(self, entry): 

if self.funcargs: 

args = [] 

for argname, argvalue in entry.frame.getargs(var=True): 

args.append((argname, self._saferepr(argvalue))) 

return ReprFuncArgs(args) 

 

def get_source(self, source, line_index=-1, excinfo=None, short=False): 

""" return formatted and marked up source lines. """ 

lines = [] 

if source is None or line_index >= len(source.lines): 

source = py.code.Source("???") 

line_index = 0 

if line_index < 0: 

line_index += len(source) 

space_prefix = " " 

if short: 

lines.append(space_prefix + source.lines[line_index].strip()) 

else: 

for line in source.lines[:line_index]: 

lines.append(space_prefix + line) 

lines.append(self.flow_marker + " " + source.lines[line_index]) 

for line in source.lines[line_index+1:]: 

lines.append(space_prefix + line) 

if excinfo is not None: 

indent = 4 if short else self._getindent(source) 

lines.extend(self.get_exconly(excinfo, indent=indent, markall=True)) 

return lines 

 

def get_exconly(self, excinfo, indent=4, markall=False): 

lines = [] 

indent = " " * indent 

# get the real exception information out 

exlines = excinfo.exconly(tryshort=True).split('\n') 

failindent = self.fail_marker + indent[1:] 

for line in exlines: 

lines.append(failindent + line) 

if not markall: 

failindent = indent 

return lines 

 

def repr_locals(self, locals): 

if self.showlocals: 

lines = [] 

keys = [loc for loc in locals if loc[0] != "@"] 

keys.sort() 

for name in keys: 

value = locals[name] 

if name == '__builtins__': 

lines.append("__builtins__ = <builtins>") 

else: 

# This formatting could all be handled by the 

# _repr() function, which is only reprlib.Repr in 

# disguise, so is very configurable. 

str_repr = self._saferepr(value) 

#if len(str_repr) < 70 or not isinstance(value, 

# (list, tuple, dict)): 

lines.append("%-10s = %s" %(name, str_repr)) 

#else: 

# self._line("%-10s =\\" % (name,)) 

# # XXX 

# pprint.pprint(value, stream=self.excinfowriter) 

return ReprLocals(lines) 

 

def repr_traceback_entry(self, entry, excinfo=None): 

source = self._getentrysource(entry) 

if source is None: 

source = py.code.Source("???") 

line_index = 0 

else: 

# entry.getfirstlinesource() can be -1, should be 0 on jython 

line_index = entry.lineno - max(entry.getfirstlinesource(), 0) 

 

lines = [] 

style = entry._repr_style 

if style is None: 

style = self.style 

if style in ("short", "long"): 

short = style == "short" 

reprargs = self.repr_args(entry) if not short else None 

s = self.get_source(source, line_index, excinfo, short=short) 

lines.extend(s) 

if short: 

message = "in %s" %(entry.name) 

else: 

message = excinfo and excinfo.typename or "" 

path = self._makepath(entry.path) 

filelocrepr = ReprFileLocation(path, entry.lineno+1, message) 

localsrepr = None 

if not short: 

localsrepr = self.repr_locals(entry.locals) 

return ReprEntry(lines, reprargs, localsrepr, filelocrepr, style) 

if excinfo: 

lines.extend(self.get_exconly(excinfo, indent=4)) 

return ReprEntry(lines, None, None, None, style) 

 

def _makepath(self, path): 

if not self.abspath: 

try: 

np = py.path.local().bestrelpath(path) 

except OSError: 

return path 

if len(np) < len(str(path)): 

path = np 

return path 

 

def repr_traceback(self, excinfo): 

traceback = excinfo.traceback 

if self.tbfilter: 

traceback = traceback.filter() 

recursionindex = None 

if excinfo.errisinstance(RuntimeError): 

if "maximum recursion depth exceeded" in str(excinfo.value): 

recursionindex = traceback.recursionindex() 

last = traceback[-1] 

entries = [] 

extraline = None 

for index, entry in enumerate(traceback): 

einfo = (last == entry) and excinfo or None 

reprentry = self.repr_traceback_entry(entry, einfo) 

entries.append(reprentry) 

if index == recursionindex: 

extraline = "!!! Recursion detected (same locals & position)" 

break 

return ReprTraceback(entries, extraline, style=self.style) 

 

def repr_excinfo(self, excinfo): 

reprtraceback = self.repr_traceback(excinfo) 

reprcrash = excinfo._getreprcrash() 

return ReprExceptionInfo(reprtraceback, reprcrash) 

 

class TerminalRepr: 

def __str__(self): 

s = self.__unicode__() 

if sys.version_info[0] < 3: 

s = s.encode('utf-8') 

return s 

 

def __unicode__(self): 

# FYI this is called from pytest-xdist's serialization of exception 

# information. 

io = py.io.TextIO() 

tw = py.io.TerminalWriter(file=io) 

self.toterminal(tw) 

return io.getvalue().strip() 

 

def __repr__(self): 

return "<%s instance at %0x>" %(self.__class__, id(self)) 

 

 

class ReprExceptionInfo(TerminalRepr): 

def __init__(self, reprtraceback, reprcrash): 

self.reprtraceback = reprtraceback 

self.reprcrash = reprcrash 

self.sections = [] 

 

def addsection(self, name, content, sep="-"): 

self.sections.append((name, content, sep)) 

 

def toterminal(self, tw): 

self.reprtraceback.toterminal(tw) 

for name, content, sep in self.sections: 

tw.sep(sep, name) 

tw.line(content) 

 

class ReprTraceback(TerminalRepr): 

entrysep = "_ " 

 

def __init__(self, reprentries, extraline, style): 

self.reprentries = reprentries 

self.extraline = extraline 

self.style = style 

 

def toterminal(self, tw): 

# the entries might have different styles 

last_style = None 

for i, entry in enumerate(self.reprentries): 

if entry.style == "long": 

tw.line("") 

entry.toterminal(tw) 

if i < len(self.reprentries) - 1: 

next_entry = self.reprentries[i+1] 

if entry.style == "long" or \ 

entry.style == "short" and next_entry.style == "long": 

tw.sep(self.entrysep) 

 

if self.extraline: 

tw.line(self.extraline) 

 

class ReprTracebackNative(ReprTraceback): 

def __init__(self, tblines): 

self.style = "native" 

self.reprentries = [ReprEntryNative(tblines)] 

self.extraline = None 

 

class ReprEntryNative(TerminalRepr): 

style = "native" 

 

def __init__(self, tblines): 

self.lines = tblines 

 

def toterminal(self, tw): 

tw.write("".join(self.lines)) 

 

class ReprEntry(TerminalRepr): 

localssep = "_ " 

 

def __init__(self, lines, reprfuncargs, reprlocals, filelocrepr, style): 

self.lines = lines 

self.reprfuncargs = reprfuncargs 

self.reprlocals = reprlocals 

self.reprfileloc = filelocrepr 

self.style = style 

 

def toterminal(self, tw): 

if self.style == "short": 

self.reprfileloc.toterminal(tw) 

for line in self.lines: 

red = line.startswith("E ") 

tw.line(line, bold=True, red=red) 

#tw.line("") 

return 

if self.reprfuncargs: 

self.reprfuncargs.toterminal(tw) 

for line in self.lines: 

red = line.startswith("E ") 

tw.line(line, bold=True, red=red) 

if self.reprlocals: 

#tw.sep(self.localssep, "Locals") 

tw.line("") 

self.reprlocals.toterminal(tw) 

if self.reprfileloc: 

if self.lines: 

tw.line("") 

self.reprfileloc.toterminal(tw) 

 

def __str__(self): 

return "%s\n%s\n%s" % ("\n".join(self.lines), 

self.reprlocals, 

self.reprfileloc) 

 

class ReprFileLocation(TerminalRepr): 

def __init__(self, path, lineno, message): 

self.path = str(path) 

self.lineno = lineno 

self.message = message 

 

def toterminal(self, tw): 

# filename and lineno output for each entry, 

# using an output format that most editors unterstand 

msg = self.message 

i = msg.find("\n") 

if i != -1: 

msg = msg[:i] 

tw.line("%s:%s: %s" %(self.path, self.lineno, msg)) 

 

class ReprLocals(TerminalRepr): 

def __init__(self, lines): 

self.lines = lines 

 

def toterminal(self, tw): 

for line in self.lines: 

tw.line(line) 

 

class ReprFuncArgs(TerminalRepr): 

def __init__(self, args): 

self.args = args 

 

def toterminal(self, tw): 

if self.args: 

linesofar = "" 

for name, value in self.args: 

ns = "%s = %s" %(name, value) 

if len(ns) + len(linesofar) + 2 > tw.fullwidth: 

if linesofar: 

tw.line(linesofar) 

linesofar = ns 

else: 

if linesofar: 

linesofar += ", " + ns 

else: 

linesofar = ns 

if linesofar: 

tw.line(linesofar) 

tw.line("") 

 

 

 

oldbuiltins = {} 

 

def patch_builtins(assertion=True, compile=True): 

""" put compile and AssertionError builtins to Python's builtins. """ 

if assertion: 

from py._code import assertion 

l = oldbuiltins.setdefault('AssertionError', []) 

l.append(py.builtin.builtins.AssertionError) 

py.builtin.builtins.AssertionError = assertion.AssertionError 

if compile: 

l = oldbuiltins.setdefault('compile', []) 

l.append(py.builtin.builtins.compile) 

py.builtin.builtins.compile = py.code.compile 

 

def unpatch_builtins(assertion=True, compile=True): 

""" remove compile and AssertionError builtins from Python builtins. """ 

if assertion: 

py.builtin.builtins.AssertionError = oldbuiltins['AssertionError'].pop() 

if compile: 

py.builtin.builtins.compile = oldbuiltins['compile'].pop() 

 

def getrawcode(obj, trycall=True): 

""" return code object for given function. """ 

try: 

return obj.__code__ 

except AttributeError: 

obj = getattr(obj, 'im_func', obj) 

obj = getattr(obj, 'func_code', obj) 

obj = getattr(obj, 'f_code', obj) 

obj = getattr(obj, '__code__', obj) 

if trycall and not hasattr(obj, 'co_firstlineno'): 

if hasattr(obj, '__call__') and not isclass(obj): 

x = getrawcode(obj.__call__, trycall=False) 

if hasattr(x, 'co_firstlineno'): 

return x 

return obj