From d7df2b4b92e198fbdbe5cfc29095d48980675004 Mon Sep 17 00:00:00 2001
From: Jacob Sandlund
Date: Tue, 24 Jun 2025 07:55:16 -0400
Subject: Add Emoji module and codegen/emoji

---
 codegen/emoji.zig | 146 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 codegen/emoji.zig

(limited to 'codegen/emoji.zig')

diff --git a/codegen/emoji.zig b/codegen/emoji.zig
new file mode 100644
index 0000000..0a4dbe6
--- /dev/null
+++ b/codegen/emoji.zig
@@ -0,0 +1,146 @@
+const std = @import("std");
+const builtin = @import("builtin");
+
+pub const Emoji = packed struct {
+    Emoji: bool = false,
+    Emoji_Presentation: bool = false,
+    Emoji_Modifier: bool = false,
+    Emoji_Modifier_Base: bool = false,
+    Emoji_Component: bool = false,
+    Extended_Pictographic: bool = false,
+};
+
+const block_size = 256;
+const Block = [block_size]u6;
+
+comptime {
+    if (@bitSizeOf(u6) != @bitSizeOf(Emoji)) {
+        @compileError("Emoji doesn't have expected bit size.");
+    }
+}
+
+const BlockMap = std.HashMap(
+    Block,
+    u16,
+    struct {
+        pub fn hash(_: @This(), k: Block) u64 {
+            var hasher = std.hash.Wyhash.init(0);
+            std.hash.autoHashStrat(&hasher, k, .DeepRecursive);
+            return hasher.final();
+        }
+
+        pub fn eql(_: @This(), a: Block, b: Block) bool {
+            return std.mem.eql(u6, &a, &b);
+        }
+    },
+    std.hash_map.default_max_load_percentage,
+);
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    const allocator = arena.allocator();
+
+    var emoji_map = std.AutoHashMap(u21, Emoji).init(allocator);
+    defer emoji_map.deinit();
+
+    var line_buf: [4096]u8 = undefined;
+
+    // Process Emoji
+    var in_file = try std.fs.cwd().openFile("data/unicode/emoji/emoji-data.txt", .{});
+    defer in_file.close();
+    var in_buf = std.io.bufferedReader(in_file.reader());
+    const in_reader = in_buf.reader();
+
+    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+        if (line.len == 0 or line[0] == '#') continue;
+        const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
+
+        var field_iter = std.mem.tokenizeAny(u8, no_comment, "; ");
+        var current_code: [2]u21 = undefined;
+
+        var i: usize = 0;
+        while (field_iter.next()) |field| : (i += 1) {
+            switch (i) {
+                0 => {
+                    // Code point(s)
+                    if (std.mem.indexOf(u8, field, "..")) |dots| {
+                        current_code = .{
+                            try std.fmt.parseInt(u21, field[0..dots], 16),
+                            try std.fmt.parseInt(u21, field[dots + 2 ..], 16),
+                        };
+                    } else {
+                        const code = try std.fmt.parseInt(u21, field, 16);
+                        current_code = .{ code, code };
+                    }
+                },
+                1 => {
+                    // Prop
+                    const prop = std.meta.stringToEnum(std.meta.FieldEnum(Emoji), field) orelse return error.InvalidProp;
+                    for (current_code[0]..current_code[1] + 1) |code| {
+                        const cp: u21 = @intCast(code);
+                        const gop = try emoji_map.getOrPut(cp);
+                        if (!gop.found_existing) gop.value_ptr.* = .{};
+                        switch (prop) {
+                            inline else => |tag| {
+                                @field(gop.value_ptr.*, @tagName(tag)) = true;
+                            },
+                        }
+                    }
+                },
+                else => {},
+            }
+        }
+    }
+
+    var blocks_map = BlockMap.init(allocator);
+    defer blocks_map.deinit();
+
+    var stage1 = std.ArrayList(u16).init(allocator);
+    defer stage1.deinit();
+
+    var stage2 = std.ArrayList(u6).init(allocator);
+    defer stage2.deinit();
+
+    var block: Block = [_]u6{0} ** block_size;
+    var block_len: u16 = 0;
+
+    for (0..0x110000) |i| {
+        const cp: u21 = @intCast(i);
+        const emoji = emoji_map.get(cp) orelse Emoji{};
+
+        block[block_len] = @bitCast(emoji);
+        block_len += 1;
+
+        if (block_len < block_size and cp != 0x10ffff) continue;
+
+        const gop = try blocks_map.getOrPut(block);
+        if (!gop.found_existing) {
+            gop.value_ptr.* = @intCast(stage2.items.len);
+            try stage2.appendSlice(&block);
+        }
+
+        try stage1.append(gop.value_ptr.*);
+        block_len = 0;
+    }
+
+    var args_iter = try std.process.argsWithAllocator(allocator);
+    defer args_iter.deinit();
+    _ = args_iter.skip();
+    const output_path = args_iter.next() orelse @panic("No output file arg!");
+
+    const compressor = std.compress.flate.deflate.compressor;
+    var out_file = try std.fs.cwd().createFile(output_path, .{});
+    defer out_file.close();
+    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
+    const writer = out_comp.writer();
+
+    const endian = builtin.cpu.arch.endian();
+    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+
+    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.writeInt(u8, i, endian);
+
+    try out_comp.flush();
+}
-- 
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