# -*- tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4 -*-
# GDB pretty printers for Boost.Smart Ptr.
#
# 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/>.

import gdb

import boost.util.printing as printing


class SmartPtrPrinter:
    """Prints smart pointers based on Boost.SmartPtr"""

    def __init__(self, typename, value):
        self.typename = typename
        self.value = value

    def to_string(self):
        if self.value['px']:
            print_object = gdb.parameter('print object')
            value = self.value['px'].dereference()
            if print_object:
                dynamic_type = self.value['px'].dynamic_type
                value = self.value['px'].cast(dynamic_type).dereference()
            return "%s %s" % (self.typename, value)
        else:
            return "empty %s" % (self.typename)

class WeakPtrPrinter:
    """Prints boost::weak_ptr instances"""

    def __init__(self, typename, value):
        self.typename = typename
        self.value = value

    def to_string(self):
        value = self.value['px']
        return "%s %s" % (self.typename, value)

printer = None

def build_pretty_printers():
    global printer

    if printer != None:
        return

    printer = printing.Printer("boost.smart_ptr")

    printer.add('boost::shared_ptr', SmartPtrPrinter)
    # printer.add('boost::shared_array', SmartPtrPrinter)
    printer.add('boost::weak_ptr', WeakPtrPrinter)
    printer.add('boost::scoped_ptr', SmartPtrPrinter)
    # printer.add('boost::scoped_array', SmartPtrPrinter)

def register_pretty_printers(obj):
    printing.register_pretty_printer(printer, obj)

build_pretty_printers()

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