gecko-dev/config/make-windows-h-wrapper.py

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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from __future__ import absolute_import
import re
import textwrap
import string
from system_header_util import header_path
comment_re = re.compile(r'//[^\n]*\n|/\*.*\*/', re.S)
decl_re = re.compile(r'''^(.+)\s+ # type
(\w+)\s* # name
(?:\((.*)\))?$ # optional param tys
''', re.X | re.S)
def read_decls(filename):
"""Parse & yield C-style decls from an input file"""
with open(filename, 'r') as fd:
# Strip comments from the source text.
text = comment_re.sub('', fd.read())
# Parse individual declarations.
raw_decls = [d.strip() for d in text.split(';') if d.strip()]
for raw in raw_decls:
match = decl_re.match(raw)
if match is None:
raise "Invalid decl: %s" % raw
ty, name, params = match.groups()
if params is not None:
params = [a.strip() for a in params.split(',') if a.strip()]
yield ty, name, params
def generate(fd, consts_path, unicodes_path, template_path, compiler):
# Parse the template
with open(template_path, 'r') as template_fd:
template = string.Template(template_fd.read())
decls = ''
# Each constant should be saved to a temporary, and then re-assigned to a
# constant with the correct name, allowing the value to be determined by
# the actual definition.
for ty, name, args in read_decls(consts_path):
assert args is None, "parameters in const decl!"
decls += textwrap.dedent("""
#ifdef {name}
constexpr {ty} _tmp_{name} = {name};
#undef {name}
constexpr {ty} {name} = _tmp_{name};
#endif
""".format(ty=ty, name=name))
# Each unicode declaration defines a static inline function with the
# correct types which calls the 'A' or 'W'-suffixed versions of the
# function. Full types are required here to ensure that '0' to 'nullptr'
# coersions are preserved.
for ty, name, args in read_decls(unicodes_path):
assert args is not None, "argument list required for unicode decl"
# Parameter & argument string list
params = ', '.join('%s a%d' % (ty, i) for i, ty in enumerate(args))
args = ', '.join('a%d' % i for i in range(len(args)))
decls += textwrap.dedent("""
#ifdef {name}
#undef {name}
static inline {ty} WINAPI
{name}({params})
{{
#ifdef UNICODE
return {name}W({args});
#else
return {name}A({args});
#endif
}}
#endif
""".format(ty=ty, name=name, params=params, args=args))
path = header_path('windows.h', compiler)
# Write out the resulting file
fd.write(template.substitute(header_path=path, decls=decls))