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parse_sdl2.py
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185 lines (163 loc) · 6.01 KB
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import os.path
import sys
import platform
import re
from typing import Iterator
import cffi # type: ignore
# Various poorly made regular expressions, these will miss code which isn't
# supported by cffi.
RE_COMMENT = re.compile(r" */\*.*?\*/", re.DOTALL)
RE_REMOVALS = re.compile(
r"#ifndef DOXYGEN_SHOULD_IGNORE_THIS.*"
r"#endif /\* DOXYGEN_SHOULD_IGNORE_THIS \*/",
re.DOTALL,
)
RE_DEFINE = re.compile(r"#define \w+(?!\() (?:.*?(?:\\\n)?)*$", re.MULTILINE)
RE_TYPEDEF = re.compile(r"^typedef[^{;#]*?(?:{[^}]*\n}[^;]*)?;", re.MULTILINE)
RE_ENUM = re.compile(r"^enum[^{;#]*?(?:{[^}]*\n}[^;]*)?;", re.MULTILINE)
RE_DECL = re.compile(r"^extern[^#\n]*\([^#]*?\);$", re.MULTILINE | re.DOTALL)
RE_ENDIAN = re.compile(
r"#if SDL_BYTEORDER == SDL_LIL_ENDIAN(.*?)#else(.*?)#endif", re.DOTALL
)
RE_ENDIAN2 = re.compile(
r"#if SDL_BYTEORDER == SDL_BIG_ENDIAN(.*?)#else(.*?)#endif", re.DOTALL
)
RE_DEFINE_TRUNCATE = re.compile(r"(#define\s+\w+\s+).+$", flags=re.DOTALL)
RE_TYPEDEF_TRUNCATE = re.compile(
r"(typedef\s+\w+\s+\w+)\s*{.*\n}(?=.*;$)", flags=re.DOTALL | re.MULTILINE
)
RE_ENUM_TRUNCATE = re.compile(
r"(\w+\s*=).+?(?=,$|})(?![^(']*\))", re.MULTILINE | re.DOTALL
)
def get_header(name: str) -> str:
"""Return the source of a header in a partially preprocessed state."""
with open(name, "r") as f:
header = f.read()
# Remove Doxygen code.
header = RE_REMOVALS.sub("", header)
# Remove comments.
header = RE_COMMENT.sub("", header)
# Deal with endianness in "SDL_audio.h".
header = RE_ENDIAN.sub(
r"\1" if sys.byteorder == "little" else r"\2", header
)
header = RE_ENDIAN2.sub(
r"\1" if sys.byteorder != "little" else r"\2", header
)
# Ignore bad ARM compiler typedef.
header = header.replace("typedef int SDL_bool;", "")
return header
# Remove non-integer definitions.
DEFINE_BLACKLIST = [
"SDL_AUDIOCVT_PACKED",
"SDL_BlitScaled",
"SDL_BlitSurface",
"SDL_Colour",
]
def parse(header: str, NEEDS_PACK4: bool) -> Iterator[str]:
"""Pull individual sections from a header, processing them as needed."""
for define in RE_DEFINE.findall(header):
if any(item in define for item in DEFINE_BLACKLIST):
continue # Remove non-integer definitions.
if '"' in define:
continue # Ignore definitions with strings.
# Replace various definitions with "..." since cffi is limited here.
yield RE_DEFINE_TRUNCATE.sub(r"\1 ...", define)
for typedef in RE_TYPEDEF.findall(header):
# Special case for SDL window flags enum.
if "SDL_WINDOW_FULLSCREEN_DESKTOP" in typedef:
typedef = typedef.replace(
"( SDL_WINDOW_FULLSCREEN | 0x00001000 )", "..."
)
# Detect array sizes at compile time.
typedef = typedef.replace("SDL_TEXTINPUTEVENT_TEXT_SIZE", "...")
typedef = typedef.replace("SDL_TEXTEDITINGEVENT_TEXT_SIZE", "...")
typedef = typedef.replace("SDL_AUDIOCVT_MAX_FILTERS + 1", "...")
typedef = typedef.replace("SDLCALL ", "")
typedef = typedef.replace("SDL_AUDIOCVT_PACKED ", "")
if NEEDS_PACK4 and "typedef struct SDL_AudioCVT" in typedef:
typedef = RE_TYPEDEF_TRUNCATE.sub(r"\1 { ...; }", typedef)
if NEEDS_PACK4 and "typedef struct SDL_TouchFingerEvent" in typedef:
typedef = RE_TYPEDEF_TRUNCATE.sub(r"\1 { ...; }", typedef)
if NEEDS_PACK4 and "typedef struct SDL_MultiGestureEvent" in typedef:
typedef = RE_TYPEDEF_TRUNCATE.sub(r"\1 { ...; }", typedef)
if NEEDS_PACK4 and "typedef struct SDL_DollarGestureEvent" in typedef:
typedef = RE_TYPEDEF_TRUNCATE.sub(r"\1 { ...; }", typedef)
yield typedef
for enum in RE_ENUM.findall(header):
yield RE_ENUM_TRUNCATE.sub(r"\1 ...", enum)
for decl in RE_DECL.findall(header):
if "SDL_RWops" in decl:
continue # Ignore SDL_RWops functions.
if "va_list" in decl:
continue
decl = re.sub(r"SDL_PRINTF_VARARG_FUNC\(\w*\)", "", decl)
decl = decl.replace("extern DECLSPEC ", "")
decl = decl.replace("SDLCALL ", "")
yield decl.replace("SDL_PRINTF_FORMAT_STRING ", "")
# Parsed headers excluding "SDL_stdinc.h"
HEADERS = [
"SDL_rect.h",
"SDL_pixels.h",
"SDL_blendmode.h",
"SDL_error.h",
"SDL_surface.h",
"SDL_video.h",
"SDL_render.h",
"SDL_audio.h",
"SDL_clipboard.h",
"SDL_touch.h",
"SDL_gesture.h",
"SDL_hints.h",
"SDL_joystick.h",
"SDL_haptic.h",
"SDL_gamecontroller.h",
"SDL_power.h",
"SDL_log.h",
"SDL_messagebox.h",
"SDL_mouse.h",
"SDL_timer.h",
"SDL_keycode.h",
"SDL_scancode.h",
"SDL_keyboard.h",
"SDL_events.h",
"SDL.h",
"SDL_version.h",
]
def add_to_ffi(ffi: cffi.FFI, path: str) -> None:
BITS, _ = platform.architecture()
cdef_args = {}
NEEDS_PACK4 = False
if sys.platform == "win32" and BITS == "32bit":
NEEDS_PACK4 = True
# The following line is required but cffi does not currently support
# it for ABI mode.
# cdef_args["pack"] = 4
ffi.cdef(
"\n".join(
RE_TYPEDEF.findall(get_header(os.path.join(path, "SDL_stdinc.h")))
).replace("SDLCALL ", ""),
**cdef_args
)
for header in HEADERS:
try:
for code in parse(
get_header(os.path.join(path, header)), NEEDS_PACK4
):
if (
"typedef struct SDL_AudioCVT" in code
and sys.platform != "win32"
and not NEEDS_PACK4
):
# This specific struct needs to be packed.
ffi.cdef(code, packed=1)
continue
ffi.cdef(code, **cdef_args)
except:
print("Error parsing %r code:\n%s" % (header, code))
raise
def get_ffi(path: str) -> cffi.FFI:
"""Return an ffi for SDL2, needs to be compiled."""
ffi = cffi.FFI()
add_to_ffi(ffi, path)
return ffi