#!/usr/bin/env python3

# Copyright 2021 The Dawn & Tint Authors
#
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# Extract SPIR-V assembly dumps from the output of
#    tint_unittests --dump-spirv
# Writes each module to a distinct filename, which is a sanitized
# form of the test name, and with a ".spvasm" suffix.
#
# Usage:
#    tint_unittests --dump-spirv | python3 extract-spvasm.py

import sys
import re


def extract():
    test_name = ''
    in_spirv = False
    parts = []
    for line in sys.stdin:
        run_match = re.match('\[ RUN\s+\]\s+(\S+)', line)
        if run_match:
            test_name = run_match.group(1)
            test_name = re.sub('[^0-9a-zA-Z]', '_', test_name) + '.spvasm'
        elif re.match('BEGIN ConvertedOk', line):
            parts = []
            in_spirv = True
        elif re.match('END ConvertedOk', line):
            with open(test_name, 'w') as f:
                f.write('; Test: ' + test_name + '\n')
                for l in parts:
                    f.write(l)
                f.close()
        elif in_spirv:
            parts.append(line)


def main(argv):
    if '--help' in argv or '-h' in argv:
        print(
            'Extract SPIR-V from the output of tint_unittests --dump-spirv\n')
        print(
            'Usage:\n    tint_unittests --dump-spirv | python3 extract-spvasm.py\n'
        )
        print(
            'Writes each module to a distinct filename, which is a sanitized')
        print('form of the test name, and with a ".spvasm" suffix.')
        return 1
    else:
        extract()
        return 0


if __name__ == '__main__':
    exit(main(sys.argv[1:]))