kc3-lang/libxkbcommon/scripts/makeheader

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• Hash : 238d1324
  Author :
  Date : 2023-09-29T11:33:28
  

  Keysyms: Fix missing hpYdiaeresis The handling of keysym name guards (e.g. `#ifndef XK_Ydiaeresis`) was incomplete and led to a missing keysym. Make `sripts/makeheader` more robust to C macros handling.

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• scripts/makeheader

• #!/usr/bin/env python3
  from __future__ import print_function
  import re
  import os
  from pathlib import Path
  
  # Expected format:
  #     #define XF86XK_FooBar 0x1234         /* some optional comment */
  # or:
  #     #define XF86XK_FooBar _EVDEVK(0x123) /* some optional comment */
  # We also need to match commented evdev entries:
  #     /* Use: XF86XK_FooBar _EVDEVK(0x123)    some optional comment */
  keysym_entry_pattern = re.compile(
      r"""^
      (?P<define>\#define|/\*\s+Use:)\s+
      (?P<prefix>\w*)XK_(?P<name>\w+)(?P<spacing>\s+)
      (?P<evdev>_EVDEVK\()?(?P<value>0x[0-9A-Fa-f]+)(?(evdev)\))
      """,
      re.VERBOSE,
  )
  
  # Match keysym guarded by #ifndef
  keysym_ifndef_pattern = re.compile(r"^#ifndef\s+(?P<prefix>\w*)XK_(?P<name>\w+)\s*$")
  
  # Match remaining XK_ references in the comments, e.g we will replace:
  #       XF86XK_CamelCaseKernelName	_EVDEVK(kernel value)
  #       #define XKB_KEY_SunCompose		0x0000FF20	/* Same as XK_Multi_key */
  # with:
  #       XKB_KEY_XF86CamelCaseKernelName	_EVDEVK(kernel value)
  #       #define XKB_KEY_SunCompose		0x0000FF20	/* Same as XKB_KEY_Multi_key */
  xorgproto_keysym_prefix_pattern = re.compile(r"\b(?P<prefix>\w*)XK_(?!KOREAN\b)")
  
  
  def make_keysym_name(m: re.Match[str]) -> str:
      return m.group("prefix") + m.group("name")
  
  
  def make_keysym_entry(m: re.Match[str]) -> str:
      """
      Perform the substitutions
      """
      if m.group("evdev"):
          if m.group("define").startswith("#"):
              # Replace the xorgproto _EVDEVK macro with the actual value:
              # 0x10081000 is the base, the evdev hex code is added to that.
              # We replace to make parsing of the keys later easier.
              value = 0x10081000 + int(m.group("value"), 16)
              value_str = f"{value:#x}    "
          else:
              value_str = f"""_EVDEVK({m.group('value')})"""
      else:
          value_str = m.group("value")
      define = m.group("define")
      prefix = m.group("prefix") or ""
      name = m.group("name")
      spacing = m.group("spacing")
      return f"""{define} XKB_KEY_{prefix}{name}{spacing}{value_str}"""
  
  
  prefix = Path(os.environ.get("X11_HEADERS_PREFIX", "/usr"))
  HEADERS = (
      prefix / "include/X11/keysymdef.h",
      prefix / "include/X11/XF86keysym.h",
      prefix / "include/X11/Sunkeysym.h",
      prefix / "include/X11/DECkeysym.h",
      prefix / "include/X11/HPkeysym.h",
  )
  
  print(
      """#ifndef _XKBCOMMON_KEYSYMS_H
  #define _XKBCOMMON_KEYSYMS_H
  
  /* This file is autogenerated; please do not commit directly. */
  
  /**
   * @file
   * Key symbols (keysyms) definitions.
   */
  
  #define XKB_KEY_NoSymbol                    0x000000  /* Special KeySym */
  """
  )
  
  keysyms: set[str] = set()
  for path in HEADERS:
      pending_guarded_keysym: str | None = None
      with path.open("rt", encoding="utf-8") as header:
          for line in header:
              # Duplicate keysym name guard
              if m := keysym_ifndef_pattern.match(line):
                  if pending_guarded_keysym:
                      raise ValueError(f"Nested #ifndef {pending_guarded_keysym}")
                  pending_guarded_keysym = make_keysym_name(m)
                  continue
  
              # Ignore C macro #ifdef/#ifndef
              elif line.startswith("#ifdef") or line.startswith("#ifndef"):
                  if pending_guarded_keysym:
                      raise ValueError(f"Nested C macro {pending_guarded_keysym}")
                  continue
  
              # Ignore C macro #endif and check end of keysym name guard
              elif line.startswith("#endif"):
                  if pending_guarded_keysym:
                      pending_guarded_keysym = None
                  continue
  
              # Remove #define _OSF_Keysyms and such.
              elif line.startswith("#define _"):
                  continue
  
              # Keysym entry: proceed various tests
              if line.startswith("#") and (m := keysym_entry_pattern.match(line)):
                  name = make_keysym_name(m)
                  # Check expected guarded keysym, if relevant
                  if pending_guarded_keysym and name != pending_guarded_keysym:
                      raise ValueError(f"{path}: Malformed keysym name guard: {line}")
                  # Check if name already defined
                  elif name in keysyms:
                      if pending_guarded_keysym:
                          # Ignore guarded keysym
                          continue
                      else:
                          raise ValueError(f"{path}: Unguarded redefinition: {line}")
                  else:
                      keysyms.add(name)
  
              # Perform _EVDEV and XK_ substitutions
              line = keysym_entry_pattern.sub(make_keysym_entry, line)
              line = xorgproto_keysym_prefix_pattern.sub(r"XKB_KEY_\1", line)
  
              print(line, end="")
  print("\n\n#endif")
  

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