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//usr/lib/python2.4/lib-old/codehack.py
# A subroutine for extracting a function name from a code object # (with cache) import sys from stat import * import string import os import linecache # XXX The functions getcodename() and getfuncname() are now obsolete # XXX as code and function objects now have a name attribute -- # XXX co.co_name and f.func_name. # XXX getlineno() is now also obsolete because of the new attribute # XXX of code objects, co.co_firstlineno. # Extract the function or class name from a code object. # This is a bit of a hack, since a code object doesn't contain # the name directly. So what do we do: # - get the filename (which *is* in the code object) # - look in the code string to find the first SET_LINENO instruction # (this must be the first instruction) # - get the line from the file # - if the line starts with 'class' or 'def' (after possible whitespace), # extract the following identifier # # This breaks apart when the function was read from <stdin> # or constructed by exec(), when the file is not accessible, # and also when the file has been modified or when a line is # continued with a backslash before the function or class name. # # Because this is a pretty expensive hack, a cache is kept. SET_LINENO = 127 # The opcode (see "opcode.h" in the Python source) identchars = string.ascii_letters + string.digits + '_' # Identifier characters _namecache = {} # The cache def getcodename(co): try: return co.co_name except AttributeError: pass key = `co` # arbitrary but uniquely identifying string if _namecache.has_key(key): return _namecache[key] filename = co.co_filename code = co.co_code name = '' if ord(code[0]) == SET_LINENO: lineno = ord(code[1]) | ord(code[2]) << 8 line = linecache.getline(filename, lineno) words = line.split() if len(words) >= 2 and words[0] in ('def', 'class'): name = words[1] for i in range(len(name)): if name[i] not in identchars: name = name[:i] break _namecache[key] = name return name # Use the above routine to find a function's name. def getfuncname(func): try: return func.func_name except AttributeError: pass return getcodename(func.func_code) # A part of the above code to extract just the line number from a code object. def getlineno(co): try: return co.co_firstlineno except AttributeError: pass code = co.co_code if ord(code[0]) == SET_LINENO: return ord(code[1]) | ord(code[2]) << 8 else: return -1