# Copyright (c) 2013, Laurent Peuch <cortex@worlddomination.be>
#
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# * Neither the name of the University of California, Berkeley nor the
#   names of its contributors may be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

from _ast import AST
from ast import parse, PyCF_ONLY_AST


def ast2json(node):
    assert isinstance(node, AST)
    to_return = {}
    to_return['_type'] = node.__class__.__name__
    for attr in dir(node):
        if attr.startswith("_"):
            continue
        to_return[attr] = get_value(getattr(node, attr))

    return to_return


def str2json(string, mode='exec'):
    return ast2json(compile(string, '<unknown>', mode, PyCF_ONLY_AST))


def get_value(attr_value):
    if attr_value is None:
        return attr_value
    if isinstance(attr_value, (int, str, float, complex, bool)):
        return attr_value
    if isinstance(attr_value, list):
        return [get_value(x) for x in attr_value]
    if isinstance(attr_value, AST):
        return ast2json(attr_value)
    else:
        raise Exception("unknow case for '%s' of type '%s'" % (attr_value, type(attr_value)))