1 files changed, 63 insertions, 0 deletions
diff --git a/components/shared/base/generate-unicode-block.py b/components/shared/base/generate-unicode-block.py
new file mode 100755
index 00000000000..3191d4f26f1
--- /dev/null
+++ b/components/shared/base/generate-unicode-block.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+# The beginning of this script is both valid shell and valid python,
+# such that the script starts with the shell and is reexecuted with
+# the right python.
+
+import dataclasses
+import re
+import sys
+
+
+@dataclasses.dataclass
+class UnicodeBlock:
+    name: str
+    start: str
+    end: str
+
+
+def process_line(line: str) -> UnicodeBlock:
+    # Split on either '..' or ';' surrounded by whitespace.
+    [start, end, name] = re.split(r"\W*\.\.|;\W*", line, maxsplit=3)
+    name = name.strip().replace("-", "").replace(" ", "")
+    return UnicodeBlock(name, start.zfill(6), end.zfill(6))
+
+
+with open(sys.argv[1]) as file:
+    lines_to_keep = filter(
+        lambda line: line.strip() and not line.startswith("#"),
+        file.readlines()
+    )
+    results = list(map(process_line, lines_to_keep))
+
+print("/* This Source Code Form is subject to the terms of the Mozilla Public")
+print(" * License, v. 2.0. If a copy of the MPL was not distributed with this")
+print(" * file, You can obtain one at https://mozilla.org/MPL/2.0/. */")
+print()
+print("// Do not edit:")
+print("// Generated via: https://www.unicode.org/Public/UNIDATA/Blocks.txt.")
+print("// $ ./generate-unicode-block.py Blocks.txt > unicode_block.rs")
+print()
+print("#[derive(Clone, Copy, Debug, PartialEq)]")
+print("pub enum UnicodeBlock {")
+for block in results:
+    print(f"    {block.name},")
+print("}")
+print()
+print("pub trait UnicodeBlockMethod {")
+print("    fn block(&self) -> Option<UnicodeBlock>;")
+print("}")
+print()
+print("impl UnicodeBlockMethod for char {")
+print("    fn block(&self) -> Option<UnicodeBlock> {")
+print("        match *self as u32 {")
+for block in results:
+    print(f"            0x{block.start}..=0x{block.end} => Some(UnicodeBlock::{block.name}),")
+print("            _ => None,")
+print("        }")
+print("    }")
+print("}")