mirror of
https://github.com/python/cpython.git
synced 2024-12-11 02:34:11 +08:00
801 lines
31 KiB
Python
801 lines
31 KiB
Python
# -*- coding: iso-8859-1 -*-
|
|
"""Get useful information from live Python objects.
|
|
|
|
This module encapsulates the interface provided by the internal special
|
|
attributes (func_*, co_*, im_*, tb_*, etc.) in a friendlier fashion.
|
|
It also provides some help for examining source code and class layout.
|
|
|
|
Here are some of the useful functions provided by this module:
|
|
|
|
ismodule(), isclass(), ismethod(), isfunction(), istraceback(),
|
|
isframe(), iscode(), isbuiltin(), isroutine() - check object types
|
|
getmembers() - get members of an object that satisfy a given condition
|
|
|
|
getfile(), getsourcefile(), getsource() - find an object's source code
|
|
getdoc(), getcomments() - get documentation on an object
|
|
getmodule() - determine the module that an object came from
|
|
getclasstree() - arrange classes so as to represent their hierarchy
|
|
|
|
getargspec(), getargvalues() - get info about function arguments
|
|
formatargspec(), formatargvalues() - format an argument spec
|
|
getouterframes(), getinnerframes() - get info about frames
|
|
currentframe() - get the current stack frame
|
|
stack(), trace() - get info about frames on the stack or in a traceback
|
|
"""
|
|
|
|
# This module is in the public domain. No warranties.
|
|
|
|
__author__ = 'Ka-Ping Yee <ping@lfw.org>'
|
|
__date__ = '1 Jan 2001'
|
|
|
|
import sys, os, types, string, re, dis, imp, tokenize, linecache
|
|
from operator import attrgetter
|
|
|
|
# ----------------------------------------------------------- type-checking
|
|
def ismodule(object):
|
|
"""Return true if the object is a module.
|
|
|
|
Module objects provide these attributes:
|
|
__doc__ documentation string
|
|
__file__ filename (missing for built-in modules)"""
|
|
return isinstance(object, types.ModuleType)
|
|
|
|
def isclass(object):
|
|
"""Return true if the object is a class.
|
|
|
|
Class objects provide these attributes:
|
|
__doc__ documentation string
|
|
__module__ name of module in which this class was defined"""
|
|
return isinstance(object, types.ClassType) or hasattr(object, '__bases__')
|
|
|
|
def ismethod(object):
|
|
"""Return true if the object is an instance method.
|
|
|
|
Instance method objects provide these attributes:
|
|
__doc__ documentation string
|
|
__name__ name with which this method was defined
|
|
im_class class object in which this method belongs
|
|
im_func function object containing implementation of method
|
|
im_self instance to which this method is bound, or None"""
|
|
return isinstance(object, types.MethodType)
|
|
|
|
def ismethoddescriptor(object):
|
|
"""Return true if the object is a method descriptor.
|
|
|
|
But not if ismethod() or isclass() or isfunction() are true.
|
|
|
|
This is new in Python 2.2, and, for example, is true of int.__add__.
|
|
An object passing this test has a __get__ attribute but not a __set__
|
|
attribute, but beyond that the set of attributes varies. __name__ is
|
|
usually sensible, and __doc__ often is.
|
|
|
|
Methods implemented via descriptors that also pass one of the other
|
|
tests return false from the ismethoddescriptor() test, simply because
|
|
the other tests promise more -- you can, e.g., count on having the
|
|
im_func attribute (etc) when an object passes ismethod()."""
|
|
return (hasattr(object, "__get__")
|
|
and not hasattr(object, "__set__") # else it's a data descriptor
|
|
and not ismethod(object) # mutual exclusion
|
|
and not isfunction(object)
|
|
and not isclass(object))
|
|
|
|
def isdatadescriptor(object):
|
|
"""Return true if the object is a data descriptor.
|
|
|
|
Data descriptors have both a __get__ and a __set__ attribute. Examples are
|
|
properties (defined in Python) and getsets and members (defined in C).
|
|
Typically, data descriptors will also have __name__ and __doc__ attributes
|
|
(properties, getsets, and members have both of these attributes), but this
|
|
is not guaranteed."""
|
|
return (hasattr(object, "__set__") and hasattr(object, "__get__"))
|
|
|
|
def isfunction(object):
|
|
"""Return true if the object is a user-defined function.
|
|
|
|
Function objects provide these attributes:
|
|
__doc__ documentation string
|
|
__name__ name with which this function was defined
|
|
func_code code object containing compiled function bytecode
|
|
func_defaults tuple of any default values for arguments
|
|
func_doc (same as __doc__)
|
|
func_globals global namespace in which this function was defined
|
|
func_name (same as __name__)"""
|
|
return isinstance(object, types.FunctionType)
|
|
|
|
def istraceback(object):
|
|
"""Return true if the object is a traceback.
|
|
|
|
Traceback objects provide these attributes:
|
|
tb_frame frame object at this level
|
|
tb_lasti index of last attempted instruction in bytecode
|
|
tb_lineno current line number in Python source code
|
|
tb_next next inner traceback object (called by this level)"""
|
|
return isinstance(object, types.TracebackType)
|
|
|
|
def isframe(object):
|
|
"""Return true if the object is a frame object.
|
|
|
|
Frame objects provide these attributes:
|
|
f_back next outer frame object (this frame's caller)
|
|
f_builtins built-in namespace seen by this frame
|
|
f_code code object being executed in this frame
|
|
f_exc_traceback traceback if raised in this frame, or None
|
|
f_exc_type exception type if raised in this frame, or None
|
|
f_exc_value exception value if raised in this frame, or None
|
|
f_globals global namespace seen by this frame
|
|
f_lasti index of last attempted instruction in bytecode
|
|
f_lineno current line number in Python source code
|
|
f_locals local namespace seen by this frame
|
|
f_restricted 0 or 1 if frame is in restricted execution mode
|
|
f_trace tracing function for this frame, or None"""
|
|
return isinstance(object, types.FrameType)
|
|
|
|
def iscode(object):
|
|
"""Return true if the object is a code object.
|
|
|
|
Code objects provide these attributes:
|
|
co_argcount number of arguments (not including * or ** args)
|
|
co_code string of raw compiled bytecode
|
|
co_consts tuple of constants used in the bytecode
|
|
co_filename name of file in which this code object was created
|
|
co_firstlineno number of first line in Python source code
|
|
co_flags bitmap: 1=optimized | 2=newlocals | 4=*arg | 8=**arg
|
|
co_lnotab encoded mapping of line numbers to bytecode indices
|
|
co_name name with which this code object was defined
|
|
co_names tuple of names of local variables
|
|
co_nlocals number of local variables
|
|
co_stacksize virtual machine stack space required
|
|
co_varnames tuple of names of arguments and local variables"""
|
|
return isinstance(object, types.CodeType)
|
|
|
|
def isbuiltin(object):
|
|
"""Return true if the object is a built-in function or method.
|
|
|
|
Built-in functions and methods provide these attributes:
|
|
__doc__ documentation string
|
|
__name__ original name of this function or method
|
|
__self__ instance to which a method is bound, or None"""
|
|
return isinstance(object, types.BuiltinFunctionType)
|
|
|
|
def isroutine(object):
|
|
"""Return true if the object is any kind of function or method."""
|
|
return (isbuiltin(object)
|
|
or isfunction(object)
|
|
or ismethod(object)
|
|
or ismethoddescriptor(object))
|
|
|
|
def getmembers(object, predicate=None):
|
|
"""Return all members of an object as (name, value) pairs sorted by name.
|
|
Optionally, only return members that satisfy a given predicate."""
|
|
results = []
|
|
for key in dir(object):
|
|
value = getattr(object, key)
|
|
if not predicate or predicate(value):
|
|
results.append((key, value))
|
|
results.sort()
|
|
return results
|
|
|
|
def classify_class_attrs(cls):
|
|
"""Return list of attribute-descriptor tuples.
|
|
|
|
For each name in dir(cls), the return list contains a 4-tuple
|
|
with these elements:
|
|
|
|
0. The name (a string).
|
|
|
|
1. The kind of attribute this is, one of these strings:
|
|
'class method' created via classmethod()
|
|
'static method' created via staticmethod()
|
|
'property' created via property()
|
|
'method' any other flavor of method
|
|
'data' not a method
|
|
|
|
2. The class which defined this attribute (a class).
|
|
|
|
3. The object as obtained directly from the defining class's
|
|
__dict__, not via getattr. This is especially important for
|
|
data attributes: C.data is just a data object, but
|
|
C.__dict__['data'] may be a data descriptor with additional
|
|
info, like a __doc__ string.
|
|
"""
|
|
|
|
mro = getmro(cls)
|
|
names = dir(cls)
|
|
result = []
|
|
for name in names:
|
|
# Get the object associated with the name.
|
|
# Getting an obj from the __dict__ sometimes reveals more than
|
|
# using getattr. Static and class methods are dramatic examples.
|
|
if name in cls.__dict__:
|
|
obj = cls.__dict__[name]
|
|
else:
|
|
obj = getattr(cls, name)
|
|
|
|
# Figure out where it was defined.
|
|
homecls = getattr(obj, "__objclass__", None)
|
|
if homecls is None:
|
|
# search the dicts.
|
|
for base in mro:
|
|
if name in base.__dict__:
|
|
homecls = base
|
|
break
|
|
|
|
# Get the object again, in order to get it from the defining
|
|
# __dict__ instead of via getattr (if possible).
|
|
if homecls is not None and name in homecls.__dict__:
|
|
obj = homecls.__dict__[name]
|
|
|
|
# Also get the object via getattr.
|
|
obj_via_getattr = getattr(cls, name)
|
|
|
|
# Classify the object.
|
|
if isinstance(obj, staticmethod):
|
|
kind = "static method"
|
|
elif isinstance(obj, classmethod):
|
|
kind = "class method"
|
|
elif isinstance(obj, property):
|
|
kind = "property"
|
|
elif (ismethod(obj_via_getattr) or
|
|
ismethoddescriptor(obj_via_getattr)):
|
|
kind = "method"
|
|
else:
|
|
kind = "data"
|
|
|
|
result.append((name, kind, homecls, obj))
|
|
|
|
return result
|
|
|
|
# ----------------------------------------------------------- class helpers
|
|
def _searchbases(cls, accum):
|
|
# Simulate the "classic class" search order.
|
|
if cls in accum:
|
|
return
|
|
accum.append(cls)
|
|
for base in cls.__bases__:
|
|
_searchbases(base, accum)
|
|
|
|
def getmro(cls):
|
|
"Return tuple of base classes (including cls) in method resolution order."
|
|
if hasattr(cls, "__mro__"):
|
|
return cls.__mro__
|
|
else:
|
|
result = []
|
|
_searchbases(cls, result)
|
|
return tuple(result)
|
|
|
|
# -------------------------------------------------- source code extraction
|
|
def indentsize(line):
|
|
"""Return the indent size, in spaces, at the start of a line of text."""
|
|
expline = string.expandtabs(line)
|
|
return len(expline) - len(string.lstrip(expline))
|
|
|
|
def getdoc(object):
|
|
"""Get the documentation string for an object.
|
|
|
|
All tabs are expanded to spaces. To clean up docstrings that are
|
|
indented to line up with blocks of code, any whitespace than can be
|
|
uniformly removed from the second line onwards is removed."""
|
|
try:
|
|
doc = object.__doc__
|
|
except AttributeError:
|
|
return None
|
|
if not isinstance(doc, types.StringTypes):
|
|
return None
|
|
try:
|
|
lines = string.split(string.expandtabs(doc), '\n')
|
|
except UnicodeError:
|
|
return None
|
|
else:
|
|
# Find minimum indentation of any non-blank lines after first line.
|
|
margin = sys.maxint
|
|
for line in lines[1:]:
|
|
content = len(string.lstrip(line))
|
|
if content:
|
|
indent = len(line) - content
|
|
margin = min(margin, indent)
|
|
# Remove indentation.
|
|
if lines:
|
|
lines[0] = lines[0].lstrip()
|
|
if margin < sys.maxint:
|
|
for i in range(1, len(lines)): lines[i] = lines[i][margin:]
|
|
# Remove any trailing or leading blank lines.
|
|
while lines and not lines[-1]:
|
|
lines.pop()
|
|
while lines and not lines[0]:
|
|
lines.pop(0)
|
|
return string.join(lines, '\n')
|
|
|
|
def getfile(object):
|
|
"""Work out which source or compiled file an object was defined in."""
|
|
if ismodule(object):
|
|
if hasattr(object, '__file__'):
|
|
return object.__file__
|
|
raise TypeError('arg is a built-in module')
|
|
if isclass(object):
|
|
object = sys.modules.get(object.__module__)
|
|
if hasattr(object, '__file__'):
|
|
return object.__file__
|
|
raise TypeError('arg is a built-in class')
|
|
if ismethod(object):
|
|
object = object.im_func
|
|
if isfunction(object):
|
|
object = object.func_code
|
|
if istraceback(object):
|
|
object = object.tb_frame
|
|
if isframe(object):
|
|
object = object.f_code
|
|
if iscode(object):
|
|
return object.co_filename
|
|
raise TypeError('arg is not a module, class, method, '
|
|
'function, traceback, frame, or code object')
|
|
|
|
def getmoduleinfo(path):
|
|
"""Get the module name, suffix, mode, and module type for a given file."""
|
|
filename = os.path.basename(path)
|
|
suffixes = map(lambda (suffix, mode, mtype):
|
|
(-len(suffix), suffix, mode, mtype), imp.get_suffixes())
|
|
suffixes.sort() # try longest suffixes first, in case they overlap
|
|
for neglen, suffix, mode, mtype in suffixes:
|
|
if filename[neglen:] == suffix:
|
|
return filename[:neglen], suffix, mode, mtype
|
|
|
|
def getmodulename(path):
|
|
"""Return the module name for a given file, or None."""
|
|
info = getmoduleinfo(path)
|
|
if info: return info[0]
|
|
|
|
def getsourcefile(object):
|
|
"""Return the Python source file an object was defined in, if it exists."""
|
|
filename = getfile(object)
|
|
if string.lower(filename[-4:]) in ['.pyc', '.pyo']:
|
|
filename = filename[:-4] + '.py'
|
|
for suffix, mode, kind in imp.get_suffixes():
|
|
if 'b' in mode and string.lower(filename[-len(suffix):]) == suffix:
|
|
# Looks like a binary file. We want to only return a text file.
|
|
return None
|
|
if os.path.exists(filename):
|
|
return filename
|
|
|
|
def getabsfile(object):
|
|
"""Return an absolute path to the source or compiled file for an object.
|
|
|
|
The idea is for each object to have a unique origin, so this routine
|
|
normalizes the result as much as possible."""
|
|
return os.path.normcase(
|
|
os.path.abspath(getsourcefile(object) or getfile(object)))
|
|
|
|
modulesbyfile = {}
|
|
|
|
def getmodule(object):
|
|
"""Return the module an object was defined in, or None if not found."""
|
|
if ismodule(object):
|
|
return object
|
|
if isclass(object):
|
|
return sys.modules.get(object.__module__)
|
|
try:
|
|
file = getabsfile(object)
|
|
except TypeError:
|
|
return None
|
|
if file in modulesbyfile:
|
|
return sys.modules.get(modulesbyfile[file])
|
|
for module in sys.modules.values():
|
|
if hasattr(module, '__file__'):
|
|
modulesbyfile[getabsfile(module)] = module.__name__
|
|
if file in modulesbyfile:
|
|
return sys.modules.get(modulesbyfile[file])
|
|
main = sys.modules['__main__']
|
|
if not hasattr(object, '__name__'):
|
|
return None
|
|
if hasattr(main, object.__name__):
|
|
mainobject = getattr(main, object.__name__)
|
|
if mainobject is object:
|
|
return main
|
|
builtin = sys.modules['__builtin__']
|
|
if hasattr(builtin, object.__name__):
|
|
builtinobject = getattr(builtin, object.__name__)
|
|
if builtinobject is object:
|
|
return builtin
|
|
|
|
def findsource(object):
|
|
"""Return the entire source file and starting line number for an object.
|
|
|
|
The argument may be a module, class, method, function, traceback, frame,
|
|
or code object. The source code is returned as a list of all the lines
|
|
in the file and the line number indexes a line in that list. An IOError
|
|
is raised if the source code cannot be retrieved."""
|
|
file = getsourcefile(object) or getfile(object)
|
|
lines = linecache.getlines(file)
|
|
if not lines:
|
|
raise IOError('could not get source code')
|
|
|
|
if ismodule(object):
|
|
return lines, 0
|
|
|
|
if isclass(object):
|
|
name = object.__name__
|
|
pat = re.compile(r'^\s*class\s*' + name + r'\b')
|
|
for i in range(len(lines)):
|
|
if pat.match(lines[i]): return lines, i
|
|
else:
|
|
raise IOError('could not find class definition')
|
|
|
|
if ismethod(object):
|
|
object = object.im_func
|
|
if isfunction(object):
|
|
object = object.func_code
|
|
if istraceback(object):
|
|
object = object.tb_frame
|
|
if isframe(object):
|
|
object = object.f_code
|
|
if iscode(object):
|
|
if not hasattr(object, 'co_firstlineno'):
|
|
raise IOError('could not find function definition')
|
|
lnum = object.co_firstlineno - 1
|
|
pat = re.compile(r'^(\s*def\s)|(.*\slambda(:|\s))')
|
|
while lnum > 0:
|
|
if pat.match(lines[lnum]): break
|
|
lnum = lnum - 1
|
|
return lines, lnum
|
|
raise IOError('could not find code object')
|
|
|
|
def getcomments(object):
|
|
"""Get lines of comments immediately preceding an object's source code.
|
|
|
|
Returns None when source can't be found.
|
|
"""
|
|
try:
|
|
lines, lnum = findsource(object)
|
|
except (IOError, TypeError):
|
|
return None
|
|
|
|
if ismodule(object):
|
|
# Look for a comment block at the top of the file.
|
|
start = 0
|
|
if lines and lines[0][:2] == '#!': start = 1
|
|
while start < len(lines) and string.strip(lines[start]) in ['', '#']:
|
|
start = start + 1
|
|
if start < len(lines) and lines[start][:1] == '#':
|
|
comments = []
|
|
end = start
|
|
while end < len(lines) and lines[end][:1] == '#':
|
|
comments.append(string.expandtabs(lines[end]))
|
|
end = end + 1
|
|
return string.join(comments, '')
|
|
|
|
# Look for a preceding block of comments at the same indentation.
|
|
elif lnum > 0:
|
|
indent = indentsize(lines[lnum])
|
|
end = lnum - 1
|
|
if end >= 0 and string.lstrip(lines[end])[:1] == '#' and \
|
|
indentsize(lines[end]) == indent:
|
|
comments = [string.lstrip(string.expandtabs(lines[end]))]
|
|
if end > 0:
|
|
end = end - 1
|
|
comment = string.lstrip(string.expandtabs(lines[end]))
|
|
while comment[:1] == '#' and indentsize(lines[end]) == indent:
|
|
comments[:0] = [comment]
|
|
end = end - 1
|
|
if end < 0: break
|
|
comment = string.lstrip(string.expandtabs(lines[end]))
|
|
while comments and string.strip(comments[0]) == '#':
|
|
comments[:1] = []
|
|
while comments and string.strip(comments[-1]) == '#':
|
|
comments[-1:] = []
|
|
return string.join(comments, '')
|
|
|
|
class ListReader:
|
|
"""Provide a readline() method to return lines from a list of strings."""
|
|
def __init__(self, lines):
|
|
self.lines = lines
|
|
self.index = 0
|
|
|
|
def readline(self):
|
|
i = self.index
|
|
if i < len(self.lines):
|
|
self.index = i + 1
|
|
return self.lines[i]
|
|
else: return ''
|
|
|
|
class EndOfBlock(Exception): pass
|
|
|
|
class BlockFinder:
|
|
"""Provide a tokeneater() method to detect the end of a code block."""
|
|
def __init__(self):
|
|
self.indent = 0
|
|
self.started = 0
|
|
self.last = 0
|
|
|
|
def tokeneater(self, type, token, (srow, scol), (erow, ecol), line):
|
|
if not self.started:
|
|
if type == tokenize.NAME: self.started = 1
|
|
elif type == tokenize.NEWLINE:
|
|
self.last = srow
|
|
elif type == tokenize.INDENT:
|
|
self.indent = self.indent + 1
|
|
elif type == tokenize.DEDENT:
|
|
self.indent = self.indent - 1
|
|
if self.indent == 0:
|
|
raise EndOfBlock, self.last
|
|
elif type == tokenize.NAME and scol == 0:
|
|
raise EndOfBlock, self.last
|
|
|
|
def getblock(lines):
|
|
"""Extract the block of code at the top of the given list of lines."""
|
|
try:
|
|
tokenize.tokenize(ListReader(lines).readline, BlockFinder().tokeneater)
|
|
except EndOfBlock, eob:
|
|
return lines[:eob.args[0]]
|
|
# Fooling the indent/dedent logic implies a one-line definition
|
|
return lines[:1]
|
|
|
|
def getsourcelines(object):
|
|
"""Return a list of source lines and starting line number for an object.
|
|
|
|
The argument may be a module, class, method, function, traceback, frame,
|
|
or code object. The source code is returned as a list of the lines
|
|
corresponding to the object and the line number indicates where in the
|
|
original source file the first line of code was found. An IOError is
|
|
raised if the source code cannot be retrieved."""
|
|
lines, lnum = findsource(object)
|
|
|
|
if ismodule(object): return lines, 0
|
|
else: return getblock(lines[lnum:]), lnum + 1
|
|
|
|
def getsource(object):
|
|
"""Return the text of the source code for an object.
|
|
|
|
The argument may be a module, class, method, function, traceback, frame,
|
|
or code object. The source code is returned as a single string. An
|
|
IOError is raised if the source code cannot be retrieved."""
|
|
lines, lnum = getsourcelines(object)
|
|
return string.join(lines, '')
|
|
|
|
# --------------------------------------------------- class tree extraction
|
|
def walktree(classes, children, parent):
|
|
"""Recursive helper function for getclasstree()."""
|
|
results = []
|
|
classes.sort(key=attrgetter('__name__'))
|
|
for c in classes:
|
|
results.append((c, c.__bases__))
|
|
if c in children:
|
|
results.append(walktree(children[c], children, c))
|
|
return results
|
|
|
|
def getclasstree(classes, unique=0):
|
|
"""Arrange the given list of classes into a hierarchy of nested lists.
|
|
|
|
Where a nested list appears, it contains classes derived from the class
|
|
whose entry immediately precedes the list. Each entry is a 2-tuple
|
|
containing a class and a tuple of its base classes. If the 'unique'
|
|
argument is true, exactly one entry appears in the returned structure
|
|
for each class in the given list. Otherwise, classes using multiple
|
|
inheritance and their descendants will appear multiple times."""
|
|
children = {}
|
|
roots = []
|
|
for c in classes:
|
|
if c.__bases__:
|
|
for parent in c.__bases__:
|
|
if not parent in children:
|
|
children[parent] = []
|
|
children[parent].append(c)
|
|
if unique and parent in classes: break
|
|
elif c not in roots:
|
|
roots.append(c)
|
|
for parent in children:
|
|
if parent not in classes:
|
|
roots.append(parent)
|
|
return walktree(roots, children, None)
|
|
|
|
# ------------------------------------------------ argument list extraction
|
|
# These constants are from Python's compile.h.
|
|
CO_OPTIMIZED, CO_NEWLOCALS, CO_VARARGS, CO_VARKEYWORDS = 1, 2, 4, 8
|
|
|
|
def getargs(co):
|
|
"""Get information about the arguments accepted by a code object.
|
|
|
|
Three things are returned: (args, varargs, varkw), where 'args' is
|
|
a list of argument names (possibly containing nested lists), and
|
|
'varargs' and 'varkw' are the names of the * and ** arguments or None."""
|
|
|
|
if not iscode(co):
|
|
raise TypeError('arg is not a code object')
|
|
|
|
code = co.co_code
|
|
nargs = co.co_argcount
|
|
names = co.co_varnames
|
|
args = list(names[:nargs])
|
|
step = 0
|
|
|
|
# The following acrobatics are for anonymous (tuple) arguments.
|
|
for i in range(nargs):
|
|
if args[i][:1] in ['', '.']:
|
|
stack, remain, count = [], [], []
|
|
while step < len(code):
|
|
op = ord(code[step])
|
|
step = step + 1
|
|
if op >= dis.HAVE_ARGUMENT:
|
|
opname = dis.opname[op]
|
|
value = ord(code[step]) + ord(code[step+1])*256
|
|
step = step + 2
|
|
if opname in ['UNPACK_TUPLE', 'UNPACK_SEQUENCE']:
|
|
remain.append(value)
|
|
count.append(value)
|
|
elif opname == 'STORE_FAST':
|
|
stack.append(names[value])
|
|
remain[-1] = remain[-1] - 1
|
|
while remain[-1] == 0:
|
|
remain.pop()
|
|
size = count.pop()
|
|
stack[-size:] = [stack[-size:]]
|
|
if not remain: break
|
|
remain[-1] = remain[-1] - 1
|
|
if not remain: break
|
|
args[i] = stack[0]
|
|
|
|
varargs = None
|
|
if co.co_flags & CO_VARARGS:
|
|
varargs = co.co_varnames[nargs]
|
|
nargs = nargs + 1
|
|
varkw = None
|
|
if co.co_flags & CO_VARKEYWORDS:
|
|
varkw = co.co_varnames[nargs]
|
|
return args, varargs, varkw
|
|
|
|
def getargspec(func):
|
|
"""Get the names and default values of a function's arguments.
|
|
|
|
A tuple of four things is returned: (args, varargs, varkw, defaults).
|
|
'args' is a list of the argument names (it may contain nested lists).
|
|
'varargs' and 'varkw' are the names of the * and ** arguments or None.
|
|
'defaults' is an n-tuple of the default values of the last n arguments.
|
|
"""
|
|
|
|
if ismethod(func):
|
|
func = func.im_func
|
|
if not isfunction(func):
|
|
raise TypeError('arg is not a Python function')
|
|
args, varargs, varkw = getargs(func.func_code)
|
|
return args, varargs, varkw, func.func_defaults
|
|
|
|
def getargvalues(frame):
|
|
"""Get information about arguments passed into a particular frame.
|
|
|
|
A tuple of four things is returned: (args, varargs, varkw, locals).
|
|
'args' is a list of the argument names (it may contain nested lists).
|
|
'varargs' and 'varkw' are the names of the * and ** arguments or None.
|
|
'locals' is the locals dictionary of the given frame."""
|
|
args, varargs, varkw = getargs(frame.f_code)
|
|
return args, varargs, varkw, frame.f_locals
|
|
|
|
def joinseq(seq):
|
|
if len(seq) == 1:
|
|
return '(' + seq[0] + ',)'
|
|
else:
|
|
return '(' + string.join(seq, ', ') + ')'
|
|
|
|
def strseq(object, convert, join=joinseq):
|
|
"""Recursively walk a sequence, stringifying each element."""
|
|
if type(object) in [types.ListType, types.TupleType]:
|
|
return join(map(lambda o, c=convert, j=join: strseq(o, c, j), object))
|
|
else:
|
|
return convert(object)
|
|
|
|
def formatargspec(args, varargs=None, varkw=None, defaults=None,
|
|
formatarg=str,
|
|
formatvarargs=lambda name: '*' + name,
|
|
formatvarkw=lambda name: '**' + name,
|
|
formatvalue=lambda value: '=' + repr(value),
|
|
join=joinseq):
|
|
"""Format an argument spec from the 4 values returned by getargspec.
|
|
|
|
The first four arguments are (args, varargs, varkw, defaults). The
|
|
other four arguments are the corresponding optional formatting functions
|
|
that are called to turn names and values into strings. The ninth
|
|
argument is an optional function to format the sequence of arguments."""
|
|
specs = []
|
|
if defaults:
|
|
firstdefault = len(args) - len(defaults)
|
|
for i in range(len(args)):
|
|
spec = strseq(args[i], formatarg, join)
|
|
if defaults and i >= firstdefault:
|
|
spec = spec + formatvalue(defaults[i - firstdefault])
|
|
specs.append(spec)
|
|
if varargs is not None:
|
|
specs.append(formatvarargs(varargs))
|
|
if varkw is not None:
|
|
specs.append(formatvarkw(varkw))
|
|
return '(' + string.join(specs, ', ') + ')'
|
|
|
|
def formatargvalues(args, varargs, varkw, locals,
|
|
formatarg=str,
|
|
formatvarargs=lambda name: '*' + name,
|
|
formatvarkw=lambda name: '**' + name,
|
|
formatvalue=lambda value: '=' + repr(value),
|
|
join=joinseq):
|
|
"""Format an argument spec from the 4 values returned by getargvalues.
|
|
|
|
The first four arguments are (args, varargs, varkw, locals). The
|
|
next four arguments are the corresponding optional formatting functions
|
|
that are called to turn names and values into strings. The ninth
|
|
argument is an optional function to format the sequence of arguments."""
|
|
def convert(name, locals=locals,
|
|
formatarg=formatarg, formatvalue=formatvalue):
|
|
return formatarg(name) + formatvalue(locals[name])
|
|
specs = []
|
|
for i in range(len(args)):
|
|
specs.append(strseq(args[i], convert, join))
|
|
if varargs:
|
|
specs.append(formatvarargs(varargs) + formatvalue(locals[varargs]))
|
|
if varkw:
|
|
specs.append(formatvarkw(varkw) + formatvalue(locals[varkw]))
|
|
return '(' + string.join(specs, ', ') + ')'
|
|
|
|
# -------------------------------------------------- stack frame extraction
|
|
def getframeinfo(frame, context=1):
|
|
"""Get information about a frame or traceback object.
|
|
|
|
A tuple of five things is returned: the filename, the line number of
|
|
the current line, the function name, a list of lines of context from
|
|
the source code, and the index of the current line within that list.
|
|
The optional second argument specifies the number of lines of context
|
|
to return, which are centered around the current line."""
|
|
if istraceback(frame):
|
|
frame = frame.tb_frame
|
|
if not isframe(frame):
|
|
raise TypeError('arg is not a frame or traceback object')
|
|
|
|
filename = getsourcefile(frame) or getfile(frame)
|
|
lineno = frame.f_lineno
|
|
if context > 0:
|
|
start = lineno - 1 - context//2
|
|
try:
|
|
lines, lnum = findsource(frame)
|
|
except IOError:
|
|
lines = index = None
|
|
else:
|
|
start = max(start, 1)
|
|
start = min(start, len(lines) - context)
|
|
lines = lines[start:start+context]
|
|
index = lineno - 1 - start
|
|
else:
|
|
lines = index = None
|
|
|
|
return (filename, lineno, frame.f_code.co_name, lines, index)
|
|
|
|
def getlineno(frame):
|
|
"""Get the line number from a frame object, allowing for optimization."""
|
|
# FrameType.f_lineno is now a descriptor that grovels co_lnotab
|
|
return frame.f_lineno
|
|
|
|
def getouterframes(frame, context=1):
|
|
"""Get a list of records for a frame and all higher (calling) frames.
|
|
|
|
Each record contains a frame object, filename, line number, function
|
|
name, a list of lines of context, and index within the context."""
|
|
framelist = []
|
|
while frame:
|
|
framelist.append((frame,) + getframeinfo(frame, context))
|
|
frame = frame.f_back
|
|
return framelist
|
|
|
|
def getinnerframes(tb, context=1):
|
|
"""Get a list of records for a traceback's frame and all lower frames.
|
|
|
|
Each record contains a frame object, filename, line number, function
|
|
name, a list of lines of context, and index within the context."""
|
|
framelist = []
|
|
while tb:
|
|
framelist.append((tb.tb_frame,) + getframeinfo(tb, context))
|
|
tb = tb.tb_next
|
|
return framelist
|
|
|
|
currentframe = sys._getframe
|
|
|
|
def stack(context=1):
|
|
"""Return a list of records for the stack above the caller's frame."""
|
|
return getouterframes(sys._getframe(1), context)
|
|
|
|
def trace(context=1):
|
|
"""Return a list of records for the stack below the current exception."""
|
|
return getinnerframes(sys.exc_info()[2], context)
|