Last active
June 16, 2019 03:35
-
-
Save pervognsen/fb31981701b534e495a8baa2a6c3ae86 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# template.py btree.inl => btree.h, btree.out.inl | |
import re | |
import sys | |
import os | |
import os.path | |
if len(sys.argv) != 2: | |
print "Usage: template.py <filename>" | |
sys.exit(1) | |
filename = sys.argv[1] | |
base, extension = os.path.splitext(filename) | |
identifier_re = r"(?:[_a-zA-Z][_a-zA-Z0-9]*)" | |
identifier_split_re = r"(%s)" % identifier_re | |
directive_re = r"/// (%s)\((.*)\)\s*$" % identifier_re | |
comma_re = r",\s*" | |
template_rules = [] | |
generated_out_filename = "%s.out%s" % (base, extension) | |
with open(generated_out_filename, "w") as generated_out: | |
generated_out.write("// Generated from %s\n\n" % filename) | |
generated_out.write('#line 1 "%s"\n' % filename) | |
for line in open(filename): | |
directive_match = re.match(directive_re, line) | |
if directive_match: | |
directive = directive_match.group(1) | |
arguments = re.split(comma_re, directive_match.group(2)) | |
if directive == "TEMPLATE": | |
template_rules.append((arguments[0], arguments[1])) | |
else: | |
print "Ignoring unknown directive: %s" % directive | |
generated_out.write(line) | |
else: | |
pieces = re.split(identifier_split_re, line) | |
for non_identifier, identifier in zip(pieces[::2], pieces[1::2]): | |
generated_out.write(non_identifier) | |
for prefix, new_prefix in template_rules: | |
if identifier.startswith(prefix): | |
generated_out.write("%s(%s)" % (prefix, identifier[len(prefix):])) | |
break | |
else: | |
generated_out.write(identifier) | |
generated_out.write(pieces[-1]) | |
join_defines = """#pragma push_macro("JOIN_HELPER") | |
#undef JOIN_HELPER | |
#define JOIN_HELPER(a, b) a##b | |
#pragma push_macro("JOIN2") | |
#undef JOIN2 | |
#define JOIN2(a, b) JOIN_HELPER(a, b) | |
#pragma push_macro("JOIN3") | |
#undef JOIN3 | |
#define JOIN3(a, b, c) JOIN2(JOIN2(a, b), c) | |
#pragma push_macro("JOIN4") | |
#undef JOIN4 | |
#define JOIN4(a, b, c, d, ...) JOIN2(JOIN2(JOIN2(a, b), c), d) | |
#pragma push_macro("JOIN") | |
#undef JOIN | |
#define JOIN(...) JOIN4(__VA_ARGS__, , , ,) | |
""" | |
join_undefines = """#pragma pop_macro("JOIN_HELPER") | |
#pragma pop_macro("JOIN2") | |
#pragma pop_macro("JOIN3") | |
#pragma pop_macro("JOIN4") | |
#pragma pop_macro("JOIN") | |
""" | |
prefix_macro_format = '#pragma push_macro("%s")\n#undef %s\n#define %s(name) JOIN2(%s, name)\n\n' | |
with open(base + ".h", "w") as generated_h: | |
generated_h.write("// Generated from %s\n\n" % filename) | |
generated_h.write(join_defines) | |
macros = [] | |
for prefix, new_prefix in template_rules: | |
generated_h.write(prefix_macro_format % (prefix, prefix, prefix, new_prefix)) | |
macros.append(prefix) | |
generated_h.write('#include "%s"\n\n' % generated_out_filename) | |
generated_h.write(join_undefines) | |
for macro in macros: | |
generated_h.write('#pragma pop_macro("%s")\n' % macro) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment