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DESC = """
debug_renamer.py
================

This script renames object addresses in debug protocols to useful names.
Comparing output will produce minimal deltas.


Problem:
--------

In the debugging output of PYSIDE-79, we want to study different output
before and after applying some change to the implementation.

We have support from the modified Python interpreter that creates full
traces of every object creation and increment/decrement of refcounts.

The comparison between "before" and "after" gets complicated because
the addresses of objects do not compare well.


Input format:
-------------
The Python output lines can be freely formatted.

Any line which contains "0x.." followed by some name will be changed,
all others are left alone.


To Do List
----------

Names of objects which are already deleted should be monitored and
not by chance be re-used. We need to think of a way to specify deletion.
"""

import re
import sys

from argparse import ArgumentParser, FileType, RawTextHelpFormatter
from collections import OrderedDict


def make_name(typename, name_pos):
    """
    Build a name by using uppercase letters and numbers
    """
    if name_pos < 26:
        name = chr(ord("A") + name_pos)
        return f"{typename}_{name}"
    return f"{typename}_{str(name_pos)}"


known_types = {}
pattern = r"0x\w+\s+\S+"    # hex word followed by non-WS
rex = re.compile(pattern, re.IGNORECASE)

def rename_hexval(line):
    if not (res := rex.search(line)):
        return line
    start_pos, end_pos = res.start(), res.end()
    beg, mid, end = line[:start_pos], line[start_pos : end_pos], line[end_pos:]
    object_id, typename = mid.split()
    if int(object_id, 16) == 0:
        return(f"{beg}{typename}_NULL{end}")
    if typename not in known_types:
        known_types[typename] = OrderedDict()
    obj_store = known_types[typename]
    if object_id not in obj_store:
        obj_store[object_id] = make_name(typename, len(obj_store))
    return(f"{beg}{obj_store[object_id]}{end}")


def hide_floatval(line):
    return re.sub(r"\d+\.\d+", "<float>", line)


def process_all_lines(options):
    """
    Process all lines from fin to fout.
    The caller is responsible of opening and closing files if at all.
    """
    fi, fo = options.input, options.output
    rename = options.rename
    float_ = options.float
    while line := fi.readline():
        if rename:
            line = rename_hexval(line)
        if float_:
            line = hide_floatval(line)
        fo.write(line)


def create_argument_parser(desc):
    parser = ArgumentParser(description=desc, formatter_class=RawTextHelpFormatter)
    parser.add_argument("--rename", "-r", action="store_true",
                        help="Rename hex value and following word to a readable f'{word}_{anum}'")
    parser.add_argument("--float", "-f", action="store_true",
                        help="Replace timing numbers by '<float>' (for comparing ctest output)")
    parser.add_argument("--input", "-i", nargs="?", type=FileType("r"), default=sys.stdin,
                        help="Use the specified file instead of sys.stdin")
    parser.add_argument("--output", "-o", nargs="?", type=FileType("w"), default=sys.stdout,
                        help="Use the specified file instead of sys.stdout")
    return parser


if __name__ == "__main__":
    argument_parser = create_argument_parser(DESC)
    options = argument_parser.parse_args()
    process_all_lines(options)
