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# Copyright 2014 Eucalyptus Systems, Inc.
#
# Redistribution and use of this software 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.
#
# 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
# OWNER 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 argparse

import requestbuilder


def parameter_list(param_list_str):
    """
    Parse a semicolon-delimited list of tag definitions from the command
    line.  Return a list with dicts that contain each parameter's key
    and value as follows:

     - 'key=value': {'ParameterKey': key, 'ParameterValue': value}
    """
    params = []
    for param_str in param_list_str.split(';'):
        errmsg = 'parameter "{0}" must have form KEY=VALUE'.format(param_str)
        if '=' in param_str:
            key, val = param_str.split('=', 1)
            if not key:
                raise argparse.ArgumentTypeError(errmsg)
            if not val:
                val = requestbuilder.EMPTY
            params.append({'ParameterKey': key, 'ParameterValue': val})
        else:
            raise argparse.ArgumentTypeError(errmsg)
    return params

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