forked from mirrors/gecko-dev
f9285c1941
Differential Revision: https://phabricator.services.mozilla.com/D64708 --HG-- extra : moz-landing-system : lando
84 lines
3 KiB
Python
84 lines
3 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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from __future__ import absolute_import
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import re
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import textwrap
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import string
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comment_re = re.compile(r'//[^\n]*\n|/\*.*\*/', re.S)
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decl_re = re.compile(r'''^(.+)\s+ # type
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(\w+)\s* # name
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(?:\((.*)\))?$ # optional param tys
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''', re.X | re.S)
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def read_decls(filename):
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"""Parse & yield C-style decls from an input file"""
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with open(filename, 'r') as fd:
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# Strip comments from the source text.
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text = comment_re.sub('', fd.read())
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# Parse individual declarations.
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raw_decls = [d.strip() for d in text.split(';') if d.strip()]
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for raw in raw_decls:
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match = decl_re.match(raw)
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if match is None:
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raise "Invalid decl: %s" % raw
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ty, name, params = match.groups()
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if params is not None:
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params = [a.strip() for a in params.split(',') if a.strip()]
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yield ty, name, params
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def generate(fd, consts_path, unicodes_path, template_path, compiler):
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# Parse the template
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with open(template_path, 'r') as template_fd:
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template = string.Template(template_fd.read())
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decls = ''
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# Each constant should be saved to a temporary, and then re-assigned to a
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# constant with the correct name, allowing the value to be determined by
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# the actual definition.
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for ty, name, args in read_decls(consts_path):
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assert args is None, "parameters in const decl!"
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decls += textwrap.dedent("""
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#ifdef {name}
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constexpr {ty} _tmp_{name} = {name};
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#undef {name}
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constexpr {ty} {name} = _tmp_{name};
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#endif
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""".format(ty=ty, name=name))
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# Each unicode declaration defines a static inline function with the
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# correct types which calls the 'A' or 'W'-suffixed versions of the
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# function. Full types are required here to ensure that '0' to 'nullptr'
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# coersions are preserved.
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for ty, name, args in read_decls(unicodes_path):
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assert args is not None, "argument list required for unicode decl"
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# Parameter & argument string list
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params = ', '.join('%s a%d' % (ty, i) for i, ty in enumerate(args))
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args = ', '.join('a%d' % i for i in range(len(args)))
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decls += textwrap.dedent("""
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#ifdef {name}
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#undef {name}
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static inline {ty} WINAPI
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{name}({params})
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{{
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#ifdef UNICODE
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return {name}W({args});
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#else
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return {name}A({args});
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#endif
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}}
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#endif
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""".format(ty=ty, name=name, params=params, args=args))
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# Write out the resulting file
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fd.write(template.substitute(decls=decls))
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