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comparison: DebugClients/Python3/DebugUtilities.py
DebugClients/Python3/DebugUtilities.py
- changeset 4455
- ca13a6f6c452
- child 4541
- e8ddd9d76414
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| 4453:e8bea5026dd0 | 4455:ca13a6f6c452 |
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2015 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing utilities functions for the debug client. | |
| 8 """ | |
| 9 | |
| 10 # | |
| 11 # Taken from inspect.py of Python 3.4 | |
| 12 # | |
| 13 | |
| 14 from collections import namedtuple | |
| 15 from inspect import iscode, isframe | |
| 16 | |
| 17 # Create constants for the compiler flags in Include/code.h | |
| 18 # We try to get them from dis to avoid duplication, but fall | |
| 19 # back to hardcoding so the dependency is optional | |
| 20 try: | |
| 21 from dis import COMPILER_FLAG_NAMES | |
| 22 except ImportError: | |
| 23 CO_OPTIMIZED, CO_NEWLOCALS = 0x1, 0x2 | |
| 24 CO_VARARGS, CO_VARKEYWORDS = 0x4, 0x8 | |
| 25 CO_NESTED, CO_GENERATOR, CO_NOFREE = 0x10, 0x20, 0x40 | |
| 26 else: | |
| 27 mod_dict = globals() | |
| 28 for k, v in COMPILER_FLAG_NAMES.items(): | |
| 29 mod_dict["CO_" + v] = k | |
| 30 | |
| 31 ArgInfo = namedtuple('ArgInfo', 'args varargs keywords locals') | |
| 32 | |
| 33 | |
| 34 def getargvalues(frame): | |
| 35 """ | |
| 36 Function to get information about arguments passed into a | |
| 37 particular frame. | |
| 38 | |
| 39 @param frame reference to a frame object to be processed | |
| 40 @type frame | |
| 41 @return tuple of four things, where 'args' is a list of the argument names, | |
| 42 'varargs' and 'varkw' are the names of the * and ** arguments or None | |
| 43 and 'locals' is the locals dictionary of the given frame. | |
| 44 @exception TypeError raised if the input parameter is not a frame object | |
| 45 """ | |
| 46 if not isframe(frame): | |
| 47 raise TypeError('{!r} is not a frame object'.format(frame)) | |
| 48 | |
| 49 args, varargs, kwonlyargs, varkw = _getfullargs(frame.f_code) | |
| 50 return ArgInfo(args + kwonlyargs, varargs, varkw, frame.f_locals) | |
| 51 | |
| 52 | |
| 53 def _getfullargs(co): | |
| 54 """ | |
| 55 Protected function to get information about the arguments accepted | |
| 56 by a code object. | |
| 57 | |
| 58 @param co reference to a code object to be processed | |
| 59 @type code | |
| 60 @return tuple of four things, where 'args' and 'kwonlyargs' are lists of | |
| 61 argument names, and 'varargs' and 'varkw' are the names of the | |
| 62 * and ** arguments or None. | |
| 63 @exception TypeError raised if the input parameter is not a code object | |
| 64 """ | |
| 65 if not iscode(co): | |
| 66 raise TypeError('{!r} is not a code object'.format(co)) | |
| 67 | |
| 68 nargs = co.co_argcount | |
| 69 names = co.co_varnames | |
| 70 nkwargs = co.co_kwonlyargcount | |
| 71 args = list(names[:nargs]) | |
| 72 kwonlyargs = list(names[nargs:nargs + nkwargs]) | |
| 73 | |
| 74 nargs += nkwargs | |
| 75 varargs = None | |
| 76 if co.co_flags & CO_VARARGS: | |
| 77 varargs = co.co_varnames[nargs] | |
| 78 nargs = nargs + 1 | |
| 79 varkw = None | |
| 80 if co.co_flags & CO_VARKEYWORDS: | |
| 81 varkw = co.co_varnames[nargs] | |
| 82 return args, varargs, kwonlyargs, varkw | |
| 83 | |
| 84 | |
| 85 def formatargvalues(args, varargs, varkw, locals, | |
| 86 formatarg=str, | |
| 87 formatvarargs=lambda name: '*' + name, | |
| 88 formatvarkw=lambda name: '**' + name, | |
| 89 formatvalue=lambda value: '=' + repr(value)): | |
| 90 """ | |
| 91 Function to format an argument spec from the 4 values returned | |
| 92 by getargvalues. | |
| 93 | |
| 94 @param args list of argument names | |
| 95 @type list of str | |
| 96 @param varargs name of the variable arguments | |
| 97 @type str | |
| 98 @param varkw name of the keyword arguments | |
| 99 @type str | |
| 100 @param locals reference to the local variables dictionary | |
| 101 @type dict | |
| 102 @keyparam formatarg argument formatting function | |
| 103 @type func | |
| 104 @keyparam formatvarargs variable arguments formatting function | |
| 105 @type func | |
| 106 @keyparam formatvarkw keyword arguments formatting function | |
| 107 @type func | |
| 108 @keyparam formatvalue value formating functtion | |
| 109 @type func | |
| 110 @return formatted call signature | |
| 111 @rtype str | |
| 112 """ | |
| 113 specs = [] | |
| 114 for i in range(len(args)): | |
| 115 name = args[i] | |
| 116 specs.append(formatarg(name) + formatvalue(locals[name])) | |
| 117 if varargs: | |
| 118 specs.append(formatvarargs(varargs) + formatvalue(locals[varargs])) | |
| 119 if varkw: | |
| 120 specs.append(formatvarkw(varkw) + formatvalue(locals[varkw])) | |
| 121 argvalues = '(' + ', '.join(specs) + ')' | |
| 122 if '__return__' in locals: | |
| 123 argvalues += " -> " + formatvalue(locals['__return__']) | |
| 124 return argvalues |
