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#! /usr/bin/env python3
# This script generates Modules/_sre/sre_constants.h from Lib/re/_constants.py.

SCRIPT_NAME = 'Tools/build/generate_sre_constants.py'

def update_file(file, content):
    try:
        with open(file, 'r') as fobj:
            if fobj.read() == content:
                return False
    except (OSError, ValueError):
        pass
    with open(file, 'w') as fobj:
        fobj.write(content)
    return True

sre_constants_header = f"""\
/*
 * Secret Labs' Regular Expression Engine
 *
 * regular expression matching engine
 *
 * Auto-generated by {SCRIPT_NAME} from
 * Lib/re/_constants.py.
 *
 * Copyright (c) 1997-2001 by Secret Labs AB.  All rights reserved.
 *
 * See the sre.c file for information on usage and redistribution.
 */

"""

def main(
    infile="Lib/re/_constants.py",
    outfile_constants="Modules/_sre/sre_constants.h",
    outfile_targets="Modules/_sre/sre_targets.h",
):
    ns = {}
    with open(infile) as fp:
        code = fp.read()
    exec(code, ns)

def dump(d, prefix):
        items = sorted(d)
        for item in items:
            yield "#define %s_%s %d\n" % (prefix, item, item)

def dump2(d, prefix):
        items = [(value, name) for name, value in d.items()
                 if name.startswith(prefix)]
        for value, name in sorted(items):
            yield "#define %s %d\n" % (name, value)

def dump_gotos(d, prefix):
        for i, item in enumerate(sorted(d)):
            assert i == item
            yield f"    &&{prefix}_{item},\n"

content = [sre_constants_header]
    content.append("#define SRE_MAGIC %d\n" % ns["MAGIC"])
    content.extend(dump(ns["OPCODES"], "SRE_OP"))
    content.extend(dump(ns["ATCODES"], "SRE"))
    content.extend(dump(ns["CHCODES"], "SRE"))
    content.extend(dump2(ns, "SRE_FLAG_"))
    content.extend(dump2(ns, "SRE_INFO_"))

update_file(outfile_constants, ''.join(content))

content = [sre_constants_header]
    content.append(f"static void *sre_targets[{len(ns['OPCODES'])}] = {{\n")
    content.extend(dump_gotos(ns["OPCODES"], "TARGET_SRE_OP"))
    content.append("};\n")

update_file(outfile_targets, ''.join(content))

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

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