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###############################################################################
# Name: misc/gdb/print.py
# Purpose: pretty-printers for wx data structures: this file is meant to
# be sourced from gdb using "source -p" (or, better, autoloaded
# in the future...)
# Author: Vadim Zeitlin
# Created: 2009-01-04
# Copyright: (c) 2009 Vadim Zeitlin
# Licence: wxWindows licence
###############################################################################
# Define wxFooPrinter class implementing (at least) to_string() method for each
# wxFoo class we want to pretty print. Then just add wxFoo to the types array
# in wxLookupFunction at the bottom of this file.
import datetime
import gdb
import itertools
import sys
if sys.version_info[0] > 2:
# Python 3
Iterator = object
long = int
else:
# Python 2, we need to make an adaptor, so we can use Python 3 iterator implementations.
class Iterator:
def next(self):
return self.__next__()
# shamelessly stolen from std::string example
class wxStringPrinter:
def __init__(self, val):
self.val = val
def to_string(self):
return self.val['m_impl']['_M_dataplus']['_M_p']
def display_hint(self):
return 'string'
class wxArrayStringPrinter:
class _iterator(Iterator):
def __init__ (self, firstItem, count):
self.item = firstItem
self.count = count
self.current = 0
def __iter__(self):
return self
def __next__(self):
current = self.current
self.current = self.current + 1
if current == self.count:
raise StopIteration
elt = self.item.dereference()
self.item = self.item + 1
return ('[%d]' % current, elt)
def __init__(self, val):
self.val = val
def children(self):
return self._iterator(self.val['m_pItems'], self.val['m_nCount'])
def to_string(self):
count = self.val['m_nCount']
capacity = self.val['m_nSize']
return ('length %d, capacity %d' % (int (count), int (capacity)))
def display_hint(self):
return 'array'
class wxDateTimePrinter:
def __init__(self, val):
self.val = val
def to_string(self):
# A value of type wxLongLong can't be used in Python arithmetic
# expressions directly so we need to convert it to long long first and
# then cast to int explicitly to be able to use it as a timestamp.
msec = self.val['m_time'].cast(gdb.lookup_type('long long'))
if msec == 0x8000000000000000:
return 'NONE'
sec = int(msec / 1000)
return datetime.datetime.fromtimestamp(sec).isoformat(' ')
class wxFileNamePrinter:
def __init__(self, val):
self.val = val
def to_string(self):
# It is simpler to just call the internal function here than to iterate
# over m_dirs array ourselves. The disadvantage of this approach is
# that it requires a live inferior process and so doesn't work when
# debugging using only a core file. If this ever becomes a serious
# problem, this should be rewritten to use m_dirs and m_name and m_ext.
return gdb.parse_and_eval('((wxFileName*)%s)->GetFullPath(0)' %
self.val.address)
class wxXYPrinterBase:
def __init__(self, val):
self.x = val['x']
self.y = val['y']
class wxPointPrinter(wxXYPrinterBase):
def to_string(self):
return '(%d, %d)' % (self.x, self.y)
class wxSizePrinter(wxXYPrinterBase):
def to_string(self):
return '%d*%d' % (self.x, self.y)
class wxRectPrinter(wxXYPrinterBase):
def __init__(self, val):
wxXYPrinterBase.__init__(self, val)
self.width = val['width']
self.height = val['height']
def to_string(self):
return '(%d, %d) %d*%d' % (self.x, self.y, self.width, self.height)
# The function looking up the pretty-printer to use for the given value.
def wxLookupFunction(val):
# Using a list is probably ok for so few items but consider switching to a
# set (or a dict and cache class types as the keys in it?) if needed later.
types = ['wxString',
'wxArrayString',
'wxDateTime',
'wxFileName',
'wxPoint',
'wxSize',
'wxRect']
for t in types:
if val.type.tag == t:
# Not sure if this is the best name to create the object of a class
# by name but at least it beats eval()
return globals()[t + 'Printer'](val)
return None
gdb.pretty_printers.append(wxLookupFunction)
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