Implementation of Unicode Bidi Algo

meta/plugins/__init__.py

@@ -0,0 +1,5 @@
+from cutekit import ensure
+
+ensure((0, 9, 0))
+
+from . import preamble # noqa E402, F401: Needed for side effect

meta/plugins/preamble.py

@@ -0,0 +1,33 @@
+import subprocess
+import requests
+
+def build_ucd_cpp():
+    subprocess.run([
+        "python3",
+        "src/libs/karm-icu/defs/build_ucd_cpp.py",
+        "src/libs/karm-icu/ucd.cpp"
+    ], check=True)
+
+
+def download_to(url, path):
+    with requests.get(url, stream=True) as r:
+        r.raise_for_status() 
+        with open(path, "wb") as f:
+            for line_bytes in r.iter_lines():
+                f.write(line_bytes)
+
+
+
+def build_preamble():
+    build_ucd_cpp()
+
+    # Unicode Bidi Character Test
+    download_to(
+        "https://www.unicode.org/Public/16.0.0/ucd/BidiCharacterTest.txt", 
+        "src/libs/karm-icu/tests/res/BidiCharacterTest.txt"
+    )
+
+
+
+if __name__ == "__main__":
+    build_preamble()

src/libs/karm-icu/base.cpp

@@ -1,5 +1,41 @@
+module;
+
+#include <karm-base/base.h>
+
 export module Karm.Icu:base;
 
 namespace Karm::Icu {
 
+usize const PLANE_SIZE = 65536; // 2^16
+
+// MARK: Bidirectional Character Types
+// https://unicode.org/reports/tr9/#Bidirectional_Character_Types
+export enum struct BidiType : u8 {
+    L = 0,    //< Left-to-right
+    LRE = 1,  //< Left-to-Right Embedding
+    LRO = 2,  //< Left-to-Right Override
+    R = 3,    //< Right-to-Left
+    AL = 4,   //< Right-to-Left Arabic
+    RLE = 5,  //< Right-to-Left Embedding
+    RLO = 6,  //< Right-to-Left Override
+    PDF = 7,  //< Pop Directional Format
+    EN = 8,   //< European Number
+    ES = 9,   //< European Number Separator
+    ET = 10,  //< European Number Terminator
+    AN = 11,  //< Arabic Number
+    CS = 12,  //< Common Number Separator
+    NSM = 13, //< Non-Spacing Mark
+    BN = 14,  //< Boundary Neutral
+    B = 15,   //< Paragraph Separator
+    S = 16,   //< Segment Separator
+    WS = 17,  //< Whitespace
+    ON = 18,  //< Other Neutrals
+    LRI = 19, //< Left-to-Right Isolate
+    RLI = 20, //< Right-to-Left Isolate
+    FSI = 21, //< First-Strong Isolate
+    PDI = 22, //< Pop Directional Isolate
+
+    _LEN
+};
+
 } // namespace Karm::Icu