# Copyright 2015 Facebook, Inc.

# 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 Facebook 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER OR 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.

import re

def parse_version(vstr):

    res = 0

    for n in vstr.split('.'):

        res = res * 1000

        res = res + int(n)

    return res

cap_versions = {

    "cmd-watch-del-all": "3.1.1",

    "cmd-watch-project": "3.1",

    "relative_root": "3.3",

    "term-dirname": "3.1",

    "term-idirname": "3.1",

    "wildmatch": "3.7",

}

def check(version, name):

    if name in cap_versions:

        return version >= parse_version(cap_versions[name])

    return False

def synthesize(vers, opts):

    """ Synthesize a capability enabled version response

        This is a very limited emulation for relatively recent feature sets

    """

    parsed_version = parse_version(vers['version'])

    vers['capabilities'] = {}

    for name in opts['optional']:

        vers['capabilities'][name] = check(parsed_version, name)

    failed = False

    for name in opts['required']:

        have = check(parsed_version, name)

        vers['capabilities'][name] = have

        if not have:

            vers['error'] = 'client required capability `' + name + \

                            '` is not supported by this server'

    return vers

# no-check-code -- this is a 3rd party library