336 lines
12 KiB
Python
336 lines
12 KiB
Python
"""
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Exception Info representation + formatting
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"""
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import py
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from py.__.code import safe_repr
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from sys import exc_info
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class ExceptionInfo(object):
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""" wraps sys.exc_info() objects and offers
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help for navigating the traceback.
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"""
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_striptext = ''
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def __init__(self, tup=None, exprinfo=None):
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# NB. all attributes are private! Subclasses or other
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# ExceptionInfo-like classes may have different attributes.
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if tup is None:
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tup = exc_info()
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if exprinfo is None and isinstance(tup[1], py.magic.AssertionError):
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exprinfo = tup[1].msg
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if exprinfo and exprinfo.startswith('assert '):
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self._striptext = 'AssertionError: '
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self._excinfo = tup
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self.type, self.value, tb = self._excinfo
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self.typename = self.type.__name__
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self.traceback = py.code.Traceback(tb)
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def __repr__(self):
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return "<ExceptionInfo %s tblen=%d>" % (self.typename, len(self.traceback))
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def exconly(self, tryshort=False):
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""" return the exception as a string
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when 'tryshort' resolves to True, and the exception is a
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py.magic.AssertionError, only the actual exception part of
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the exception representation is returned (so 'AssertionError: ' is
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removed from the beginning)
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"""
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lines = py.std.traceback.format_exception_only(self.type, self.value)
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text = ''.join(lines)
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if text.endswith('\n'):
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text = text[:-1]
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if tryshort:
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if text.startswith(self._striptext):
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text = text[len(self._striptext):]
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return text
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def errisinstance(self, exc):
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""" return True if the exception is an instance of exc """
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return isinstance(self.value, exc)
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def _getreprcrash(self):
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exconly = self.exconly(tryshort=True)
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entry = self.traceback.getcrashentry()
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path, lineno = entry.path, entry.lineno
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reprcrash = ReprFileLocation(path, lineno+1, exconly)
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return reprcrash
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def getrepr(self, showlocals=False, style="long", tbfilter=True, funcargs=False):
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""" return str()able representation of this exception info.
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showlocals: show locals per traceback entry
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style: long|short|no traceback style
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tbfilter: hide entries (where __tracebackhide__ is true)
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"""
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fmt = FormattedExcinfo(showlocals=showlocals, style=style,
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tbfilter=tbfilter, funcargs=funcargs)
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return fmt.repr_excinfo(self)
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def __str__(self):
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entry = self.traceback[-1]
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loc = ReprFileLocation(entry.path, entry.lineno + 1, self.exconly())
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return str(loc)
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class FormattedExcinfo(object):
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""" presenting information about failing Functions and Generators. """
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# for traceback entries
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flow_marker = ">"
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fail_marker = "E"
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def __init__(self, showlocals=False, style="long", tbfilter=True, funcargs=False):
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self.showlocals = showlocals
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self.style = style
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self.tbfilter = tbfilter
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self.funcargs = funcargs
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def _getindent(self, source):
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# figure out indent for given source
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try:
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s = str(source.getstatement(len(source)-1))
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except KeyboardInterrupt:
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raise
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except:
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try:
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s = str(source[-1])
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except:
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return 0
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return 4 + (len(s) - len(s.lstrip()))
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def _getentrysource(self, entry):
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source = entry.getsource()
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if source is not None:
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source = source.deindent()
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return source
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def _saferepr(self, obj):
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return safe_repr._repr(obj)
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def repr_args(self, entry):
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if self.funcargs:
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args = []
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for argname, argvalue in entry.frame.getargs():
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args.append((argname, self._saferepr(argvalue)))
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return ReprFuncArgs(args)
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def get_source(self, source, line_index=-1, excinfo=None):
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""" return formatted and marked up source lines. """
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lines = []
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if source is None:
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source = py.code.Source("???")
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line_index = 0
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if line_index < 0:
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line_index += len(source)
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for i in range(len(source)):
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if i == line_index:
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prefix = self.flow_marker + " "
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else:
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prefix = " "
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line = prefix + source[i]
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lines.append(line)
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if excinfo is not None:
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indent = self._getindent(source)
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lines.extend(self.get_exconly(excinfo, indent=indent, markall=True))
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return lines
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def get_exconly(self, excinfo, indent=4, markall=False):
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lines = []
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indent = " " * indent
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# get the real exception information out
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exlines = excinfo.exconly(tryshort=True).split('\n')
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failindent = self.fail_marker + indent[1:]
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for line in exlines:
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lines.append(failindent + line)
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if not markall:
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failindent = indent
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return lines
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def repr_locals(self, locals):
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if self.showlocals:
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lines = []
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items = locals.items()
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items.sort()
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for name, value in items:
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if name == '__builtins__':
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lines.append("__builtins__ = <builtins>")
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else:
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# This formatting could all be handled by the _repr() function, which is
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# only repr.Repr in disguise, so is very configurable.
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str_repr = self._saferepr(value)
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#if len(str_repr) < 70 or not isinstance(value,
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# (list, tuple, dict)):
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lines.append("%-10s = %s" %(name, str_repr))
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#else:
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# self._line("%-10s =\\" % (name,))
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# # XXX
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# py.std.pprint.pprint(value, stream=self.excinfowriter)
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return ReprLocals(lines)
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def repr_traceback_entry(self, entry, excinfo=None):
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# excinfo is not None if this is the last tb entry
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source = self._getentrysource(entry)
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if source is None:
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source = py.code.Source("???")
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line_index = 0
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else:
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line_index = entry.lineno - entry.getfirstlinesource()
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lines = []
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if self.style == "long":
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reprargs = self.repr_args(entry)
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lines.extend(self.get_source(source, line_index, excinfo))
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message = excinfo and excinfo.typename or ""
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filelocrepr = ReprFileLocation(entry.path, entry.lineno+1, message)
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localsrepr = self.repr_locals(entry.locals)
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return ReprEntry(lines, reprargs, localsrepr, filelocrepr)
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else:
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if self.style == "short":
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line = source[line_index].lstrip()
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lines.append(' File "%s", line %d, in %s' % (
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entry.path.basename, entry.lineno+1, entry.name))
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lines.append(" " + line)
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if excinfo:
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lines.extend(self.get_exconly(excinfo, indent=4))
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return ReprEntry(lines, None, None, None)
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def repr_traceback(self, excinfo):
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traceback = excinfo.traceback
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if self.tbfilter:
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traceback = traceback.filter()
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recursionindex = None
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if excinfo.errisinstance(RuntimeError):
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recursionindex = traceback.recursionindex()
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last = traceback[-1]
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entries = []
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extraline = None
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for index, entry in py.builtin.enumerate(traceback):
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einfo = (last == entry) and excinfo or None
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reprentry = self.repr_traceback_entry(entry, einfo)
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entries.append(reprentry)
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if index == recursionindex:
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extraline = "!!! Recursion detected (same locals & position)"
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break
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return ReprTraceback(entries, extraline, style=self.style)
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def repr_excinfo(self, excinfo):
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reprtraceback = self.repr_traceback(excinfo)
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reprcrash = excinfo._getreprcrash()
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return ReprExceptionInfo(reprtraceback, reprcrash)
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class Repr:
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def __str__(self):
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tw = py.io.TerminalWriter(stringio=True)
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self.toterminal(tw)
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return tw.stringio.getvalue().strip()
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def __repr__(self):
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return "<%s instance at %0x>" %(self.__class__, id(self))
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class ReprExceptionInfo(Repr):
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def __init__(self, reprtraceback, reprcrash):
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self.reprtraceback = reprtraceback
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self.reprcrash = reprcrash
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self.sections = []
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def addsection(self, name, content, sep="-"):
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self.sections.append((name, content, sep))
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def toterminal(self, tw):
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self.reprtraceback.toterminal(tw)
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for name, content, sep in self.sections:
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tw.sep(sep, name)
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tw.line(content)
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class ReprTraceback(Repr):
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entrysep = "_ "
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def __init__(self, reprentries, extraline, style):
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self.reprentries = reprentries
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self.extraline = extraline
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self.style = style
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def toterminal(self, tw):
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sepok = False
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for entry in self.reprentries:
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if self.style == "long":
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if sepok:
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tw.sep(self.entrysep)
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tw.line("")
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sepok = True
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entry.toterminal(tw)
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if self.extraline:
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tw.line(self.extraline)
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class ReprEntry(Repr):
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localssep = "_ "
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def __init__(self, lines, reprfuncargs, reprlocals, filelocrepr):
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self.lines = lines
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self.reprfuncargs = reprfuncargs
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self.reprlocals = reprlocals
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self.reprfileloc = filelocrepr
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def toterminal(self, tw):
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if self.reprfuncargs:
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self.reprfuncargs.toterminal(tw)
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for line in self.lines:
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red = line.startswith("E ")
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tw.line(line, bold=True, red=red)
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if self.reprlocals:
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#tw.sep(self.localssep, "Locals")
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tw.line("")
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self.reprlocals.toterminal(tw)
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if self.reprfileloc:
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tw.line("")
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self.reprfileloc.toterminal(tw)
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def __str__(self):
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return "%s\n%s\n%s" % ("\n".join(self.lines),
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self.reprlocals,
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self.reprfileloc)
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class ReprFileLocation(Repr):
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def __init__(self, path, lineno, message):
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self.path = str(path)
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self.lineno = lineno
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self.message = message
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def toterminal(self, tw):
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# filename and lineno output for each entry,
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# using an output format that most editors unterstand
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msg = self.message
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i = msg.find("\n")
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if i != -1:
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msg = msg[:i]
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tw.line("%s:%s: %s" %(self.path, self.lineno, msg))
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class ReprLocals(Repr):
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def __init__(self, lines):
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self.lines = lines
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def toterminal(self, tw):
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for line in self.lines:
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tw.line(line)
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class ReprFuncArgs(Repr):
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def __init__(self, args):
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self.args = args
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def toterminal(self, tw):
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if self.args:
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linesofar = ""
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for name, value in self.args:
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ns = "%s = %s" %(name, value)
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if len(ns) + len(linesofar) + 2 > tw.fullwidth:
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if linesofar:
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tw.line(linesofar)
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linesofar = ns
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else:
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if linesofar:
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linesofar += ", " + ns
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else:
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linesofar = ns
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if linesofar:
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tw.line(linesofar)
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tw.line("")
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