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# -*- tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4 -*-
#
# This file is part of the LibreOffice project.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
import gdb
from libreoffice.util.compatibility import use_lazy_string
class StringPrinterHelper(object):
'''Base for all string pretty printers'''
class MustBeImplemented(Exception):
pass
def __init__(self, typename, val, encoding = None):
self.typename = typename
self.val = val
self.encoding = encoding
def to_string(self):
if self.valid():
data = self.data()
len = self.length()
return self.make_string(data, self.encoding, len)
else:
return "uninitialized %s" % self.typename
def display_hint(self):
if self.valid():
return 'string'
else:
return None
def valid(self):
return True
def data(self):
raise self.MustBeImplemented()
def length(self):
return -1
@staticmethod
def make_string(data, encoding = None, length = -1):
'''Creates a new string from memory'''
if not encoding:
encoding = ''
# we need to determine length, if not given (for sal_Unicode*)
if length < 0:
length = 0
while data[length] != 0 and length <= 512: # arbitrary limit
length += 1
if use_lazy_string:
return data.lazy_string(encoding, length)
# The gdb.Value.string() conversion works on array of bytes, but
# the length we have is the length of the string. So we must
# multiply it by width of character if the string is Unicode.
width = data[0].type.sizeof
if width > 1:
length = length * width
char = gdb.lookup_type('char')
bytes = data.cast(char.pointer())
return bytes.string(encoding, length = length)
# vim:set shiftwidth=4 softtabstop=4 expandtab:
|
