#!/usr/bin/env python3
"""
Library for manipulating ROS Names. See U{http://ros.org/wiki/Names}.
"""

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# Revision $Id: names.py 14589 2011-08-07 18:30:21Z kwc $


import os
import sys

SEP = '/'
GLOBALNS = '/'
PRIV_NAME = '~'
REMAP = ":="
ANYTYPE = '*'

def load_mappings(argv):
    """
    Load name mappings encoded in command-line arguments. This will filter
    out any parameter assignment mappings.

    @param argv: command-line arguments
    @type  argv: [str]
    @return: name->name remappings.
    @rtype: dict {str: str}
    """
    mappings = {}
    for arg in argv:
        if REMAP in arg:
            try:
                src, dst = [x.strip() for x in arg.split(REMAP)]
                if src and dst:

                    if len(src) > 1 and src[0] == '_' and src[1] != '_':
                        # ignore parameter assignment mappings
                        pass
                    else:
                        mappings[src] = dst
            except BaseException:
                #TODO: remove
                sys.stderr.write(
                    "ERROR: Invalid remapping argument '%s'\n" %
                    arg)
    return mappings