#!/usr/bin/env python3
"""
svg_extract.py  –  dump every title + id pair found in an SVG file
usage:  python3 svg_extract.py input.svg [> pairs.txt]
"""

import sys, re, html

def main():
    if len(sys.argv) != 2:
        sys.exit("Usage: python3 svg_extract.py file.svg")

    with open(sys.argv[1], encoding='utf-8') as f:
        data = f.read()

    # fast & simple regex: captures id and title in any order
    pattern = re.compile(
        r'<[^>]*?\b(id=["\'](?P<id>[^"\']+)["\'])[^>]*?\b(title=["\'](?P<title>[^"\']+)["\'])'
        r'|'
        r'<[^>]*?\b(title=["\'](?P<title2>[^"\']+)["\'])[^>]*?\b(id=["\'](?P<id2>[^"\']+)["\'])',
        re.I
    )

    seen = set()
    for m in pattern.finditer(data):
        id_val   = html.unescape(m.group('id')   or m.group('id2'))
        title_val = html.unescape(m.group('title') or m.group('title2'))
        if (id_val, title_val) not in seen:       # avoid duplicates
            seen.add((id_val, title_val))
            print(f"{title_val}\t{id_val}")

if __name__ == '__main__':
    main()