#!/usr/bin/env python

# Converts a map spreadsheet to human-readable (but machine unusable) form

# Usage: self [col_num...] <in_map >out_map

import csv

import re

import sys

def sub_nested(regex, repl, str_):

    while True:

        str_, n = re.subn(regex, repl, str_)

        if n == 0: return str_

def cleanup(xpath):

    truncated = False

    # Remove attrs

    xpath = sub_nested(r':\[[^\[\]]*?\]', r'', xpath)

    # Remove keys except last

    xpath = sub_nested(r':?\[[^\[\]]*?\](?=.*\[[^\[\]]*?\].*?)', r'', xpath)

    # Remove lookahead assertions

    xpath = sub_nested(r'\((/[^\)]*?)\)(?=/)', r'\1', xpath)

    # Remove pointers

    xpath, n = re.subn(r'^.*->', r'', xpath)

    if n > 0: truncated = True

    # Remove part of path before first key list, XML function, or path end

    # Leave enough to include the table of a user-defined value

    xpath, n = re.subn(r'^(?:/(?!_)[\w*]+)*(?=(?:/(?!_)[\w*]+){2}(?:\[|/_|$))',

        r'', xpath)

    if n > 0: truncated = True

    # Remove XML functions other than unit conversions

    xpath = re.sub(r'/_(?!\w+_to_)\w+/\w+', r'', xpath)

    # Remove backward (child-to-parent) pointer's target ID attr

    xpath = re.sub(r'\[[\w*]+\]|(?<=\[)[\w*]+,', r'', xpath)

    # Remove negative keys

    xpath = re.sub(r',?!(?:[\w*]+/)*@?[\w*]+', r'', xpath)

    # Remove path before key

    xpath = re.sub(r'(?:[\w*]+/)*(@?[\w*]+)(?==)', r'\1', xpath)

    # Prepend / to show truncation

    if truncated: xpath = '/'+xpath

    return xpath

def main():

    col_nums = sys.argv[1:]

    if col_nums == []: col_nums = range(2)

    col_nums = map(int, col_nums) # 0-based

    # Convert map

    reader = csv.reader(sys.stdin)

    writer = csv.writer(sys.stdout)

    writer.writerow(reader.next())

    for row in reader:

        for i in col_nums: row[i] = cleanup(row[i])

        writer.writerow(row)

main()