Issue #947: Improved layout handling and Unicode -> X11 keysyms translation

kvmd/keyboard/printer.py

@@ -20,22 +20,50 @@
 # ========================================================================== #
 
 
+import ctypes
+import ctypes.util
+
 from typing import Generator
 
 from .keysym import SymmapModifiers
 from .mappings import WebModifiers
 
 
+# =====
+def _load_libxkbcommon() -> ctypes.CDLL:
+    path = ctypes.util.find_library("xkbcommon")
+    if not path:
+        raise RuntimeError("Where is libxkbcommon?")
+    assert path
+    lib = ctypes.CDLL(path)
+    for (name, restype, argtypes) in [
+        ("xkb_utf32_to_keysym", ctypes.c_uint32, [ctypes.c_uint32]),
+    ]:
+        func = getattr(lib, name)
+        if not func:
+            raise RuntimeError(f"Where is libc.{name}?")
+        setattr(func, "restype", restype)
+        setattr(func, "argtypes", argtypes)
+    return lib
+
+
+_libxkbcommon = _load_libxkbcommon()
+
+
+def _ch_to_keysym(ch: str) -> int:
+    assert len(ch) == 1
+    return _libxkbcommon.xkb_utf32_to_keysym(ord(ch))
+
+
 # =====
 def text_to_web_keys(  # pylint: disable=too-many-branches
     text: str,
     symmap: dict[int, dict[int, str]],
-    shift_key: str=WebModifiers.SHIFT_LEFT,
 ) -> Generator[tuple[str, bool], None, None]:
 
-    assert shift_key in WebModifiers.SHIFTS
+    shift = False
+    altgr = False
 
-    shifted = False
     for ch in text:
         # https://stackoverflow.com/questions/12343987/convert-ascii-character-to-x11-keycode
         # https://www.ascii-code.com
@@ -57,25 +85,34 @@ def text_to_web_keys(  # pylint: disable=too-many-branches
             if not ch.isprintable():
                 continue
             try:
-                keys = symmap[ord(ch)]
+                keys = symmap[_ch_to_keysym(ch)]
             except Exception:
                 continue
 
-        for (modifiers, key) in reversed(keys.items()):
-            if (modifiers & SymmapModifiers.ALTGR) or (modifiers & SymmapModifiers.CTRL):
+        for (modifiers, key) in keys.items():
+            if modifiers & SymmapModifiers.CTRL:
                 # Not supported yet
                 continue
 
-            if modifiers & SymmapModifiers.SHIFT and not shifted:
-                yield (shift_key, True)
-                shifted = True
-            elif not (modifiers & SymmapModifiers.SHIFT) and shifted:
-                yield (shift_key, False)
-                shifted = False
+            if modifiers & SymmapModifiers.SHIFT and not shift:
+                yield (WebModifiers.SHIFT_LEFT, True)
+                shift = True
+            elif not (modifiers & SymmapModifiers.SHIFT) and shift:
+                yield (WebModifiers.SHIFT_LEFT, False)
+                shift = False
+
+            if modifiers & SymmapModifiers.ALTGR and not altgr:
+                yield (WebModifiers.ALT_RIGHT, True)
+                altgr = True
+            elif not (modifiers & SymmapModifiers.ALTGR) and altgr:
+                yield (WebModifiers.ALT_RIGHT, False)
+                altgr = False
 
             yield (key, True)
             yield (key, False)
             break
 
-    if shifted:
-        yield (shift_key, False)
+    if shift:
+        yield (WebModifiers.SHIFT_LEFT, False)
+    if altgr:
+        yield (WebModifiers.ALT_RIGHT, False)