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78 lines
2.1 KiB
Python
Executable file
78 lines
2.1 KiB
Python
Executable file
#! /usr/bin/env python3
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# This script generates Modules/_sre/sre_constants.h from Lib/re/_constants.py.
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def update_file(file, content):
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try:
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with open(file, 'r') as fobj:
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if fobj.read() == content:
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return False
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except (OSError, ValueError):
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pass
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with open(file, 'w') as fobj:
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fobj.write(content)
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return True
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sre_constants_header = """\
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/*
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* Secret Labs' Regular Expression Engine
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*
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* regular expression matching engine
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*
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* Auto-generated by Tools/scripts/generate_sre_constants.py from
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* Lib/re/_constants.py.
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*
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* Copyright (c) 1997-2001 by Secret Labs AB. All rights reserved.
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*
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* See the sre.c file for information on usage and redistribution.
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*/
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"""
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def main(
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infile="Lib/re/_constants.py",
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outfile_constants="Modules/_sre/sre_constants.h",
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outfile_targets="Modules/_sre/sre_targets.h",
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):
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ns = {}
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with open(infile) as fp:
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code = fp.read()
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exec(code, ns)
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def dump(d, prefix):
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items = sorted(d)
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for item in items:
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yield "#define %s_%s %d\n" % (prefix, item, item)
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def dump2(d, prefix):
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items = [(value, name) for name, value in d.items()
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if name.startswith(prefix)]
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for value, name in sorted(items):
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yield "#define %s %d\n" % (name, value)
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def dump_gotos(d, prefix):
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for i, item in enumerate(sorted(d)):
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assert i == item
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yield f" &&{prefix}_{item},\n"
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content = [sre_constants_header]
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content.append("#define SRE_MAGIC %d\n" % ns["MAGIC"])
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content.extend(dump(ns["OPCODES"], "SRE_OP"))
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content.extend(dump(ns["ATCODES"], "SRE"))
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content.extend(dump(ns["CHCODES"], "SRE"))
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content.extend(dump2(ns, "SRE_FLAG_"))
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content.extend(dump2(ns, "SRE_INFO_"))
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update_file(outfile_constants, ''.join(content))
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content = [sre_constants_header]
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content.append(f"static void *sre_targets[{len(ns['OPCODES'])}] = {{\n")
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content.extend(dump_gotos(ns["OPCODES"], "TARGET_SRE_OP"))
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content.append("};\n")
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update_file(outfile_targets, ''.join(content))
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if __name__ == '__main__':
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import sys
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main(*sys.argv[1:])
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