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#!/usr/bin/env python
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# Converts a map spreadsheet to human-readable (but machine unusable) form
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# Usage: self [col_num...] <in_map >out_map
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import csv
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import re
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import sys
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def sub_nested(regex, repl, str_):
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    while True:
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        str_, n = re.subn(regex, repl, str_)
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        if n == 0: return str_
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def cleanup(xpath):
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    truncated = False
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    # Remove attrs
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    xpath = sub_nested(r':\[[^\[\]]*?\]', r'', xpath)
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    # Remove keys except last
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    xpath = sub_nested(r':?\[[^\[\]]*?\](?=.*\[[^\[\]]*?\].*?)', r'', xpath)
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    # Remove lookahead assertions
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    xpath = sub_nested(r'\((/[^\)]*?)\)(?=/)', r'\1', xpath)
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    # Remove pointers
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    xpath, n = re.subn(r'^.*->', r'', xpath)
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    if n > 0: truncated = True
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    # Remove part of path before first key list, XML function, or path end
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    # Leave enough to include the table of a user-defined value
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    xpath, n = re.subn(r'^(?:/(?!_)[\w*]+)*(?=(?:/(?!_)[\w*]+){2}(?:\[|/_|$))',
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        r'', xpath)
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    if n > 0: truncated = True
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    # Remove XML functions other than unit conversions
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    xpath = re.sub(r'/_(?!\w+_to_)\w+/\w+', r'', xpath)
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    # Remove backward (child-to-parent) pointer's target ID attr
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    xpath = re.sub(r'\[[\w*]+\]|(?<=\[)[\w*]+,', r'', xpath)
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    # Remove negative keys
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    xpath = re.sub(r',?!(?:[\w*]+/)*@?[\w*]+', r'', xpath)
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    # Remove path before key
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    xpath = re.sub(r'(?:[\w*]+/)*(@?[\w*]+)(?==)', r'\1', xpath)
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    # Prepend / to show truncation
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    if truncated: xpath = '/'+xpath
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    return xpath
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def main():
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    col_nums = sys.argv[1:]
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    if col_nums == []: col_nums = range(2)
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    col_nums = map(int, col_nums) # 0-based
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    # Convert map
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    reader = csv.reader(sys.stdin)
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    writer = csv.writer(sys.stdout)
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    writer.writerow(reader.next())
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    for row in reader:
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        for i in col_nums: row[i] = cleanup(row[i])
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        writer.writerow(row)
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main()
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