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# -*- tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4 -*-
# Printer interface adaptor.
#
# Copyright (C) 2012 Red Hat, Inc., David Tardon <dtardon@redhat.com>
#
# This file is part of boost-gdb-printers.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from collections.abc import Mapping
import gdb
import re
import six
from boost.util.compatibility import use_gdb_printing
class SimplePrinter(object):
def __init__(self, name, function):
self.name = name
self.function = function
self.enabled = True
def invoke(self, val):
if not self.enabled:
return None
return self.function(self.name, val)
class NameLookup(Mapping):
def __init__(self):
self.map = {}
self.name_regex = re.compile('^([\w:]+)(<.*>)?')
def add(self, name, printer):
self.map[name] = printer
def __len__(self):
return len(self.map)
def __getitem__(self, type):
typename = self._basic_type(type)
if typename and typename in self.map:
return self.map[typename]
return None
def __iter__(self):
return self.map
def _basic_type(self, type):
basic_type = self.basic_type(type)
if basic_type:
match = self.name_regex.match(basic_type)
if match:
return match.group(1)
return None
@staticmethod
def basic_type(type):
if type.code == gdb.TYPE_CODE_REF:
type = type.target()
type = type.unqualified().strip_typedefs()
return type.tag
class FunctionLookup(Mapping):
def __init__(self):
self.map = {}
def add(self, test, printer):
self.map[test] = printer
def __len__(self):
return len(self.map)
def __getitem__(self, type):
for (test, printer) in six.iteritems(self.map):
if test(type):
return printer
return None
def __iter__(self):
return self.map
class Printer(object):
def __init__(self, name):
self.name = name
self.subprinters = []
self.name_lookup = NameLookup()
self.func_lookup = FunctionLookup()
self.enabled = True
def add(self, name, function, lookup = None):
printer = SimplePrinter(name, function)
self.subprinters.append(printer)
if not lookup:
self.name_lookup.add(name, printer)
else:
self.func_lookup.add(lookup, printer)
def __call__(self, val):
printer = self.name_lookup[val.type]
if not printer:
printer = self.func_lookup[val.type]
if printer:
return printer.invoke(val)
return None
def register_pretty_printer(printer, obj):
'''Registers printer with objfile'''
if use_gdb_printing:
gdb.printing.register_pretty_printer(obj, printer)
else:
if obj is None:
obj = gdb
obj.pretty_printers.append(printer)
# vim:set filetype=python shiftwidth=4 softtabstop=4 expandtab:
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