From ecd9c2277de17e24fa26aefee955caa10b5b990c Mon Sep 17 00:00:00 2001
From: Jose Colon Rodriguez
Date: Tue, 27 Feb 2024 18:04:32 -0400
Subject: General Category with GenCatData

---
 codegen/gencat.zig | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 codegen/gencat.zig

(limited to 'codegen/gencat.zig')

diff --git a/codegen/gencat.zig b/codegen/gencat.zig
new file mode 100644
index 0000000..5407040
--- /dev/null
+++ b/codegen/gencat.zig
@@ -0,0 +1,172 @@
+const std = @import("std");
+const builtin = @import("builtin");
+
+const Gc = enum {
+    Cc,
+    Cf,
+    Cn,
+    Co,
+    Cs,
+    Ll,
+    Lm,
+    Lo,
+    Lt,
+    Lu,
+    Mc,
+    Me,
+    Mn,
+    Nd,
+    Nl,
+    No,
+    Pc,
+    Pd,
+    Pe,
+    Pf,
+    Pi,
+    Po,
+    Ps,
+    Sc,
+    Sk,
+    Sm,
+    So,
+    Zl,
+    Zp,
+    Zs,
+};
+
+const block_size = 256;
+const Block = [block_size]u5;
+
+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(u5, &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 flat_map = std.AutoHashMap(u21, u5).init(allocator);
+    defer flat_map.deinit();
+
+    var line_buf: [4096]u8 = undefined;
+
+    // Process DerivedEastAsianWidth.txt
+    var in_file = try std.fs.cwd().openFile("data/unicode/extracted/DerivedGeneralCategory.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 => {
+                    // General category
+                    const gc = std.meta.stringToEnum(Gc, field) orelse return error.UnknownGenCat;
+                    for (current_code[0]..current_code[1] + 1) |cp| try flat_map.put(@intCast(cp), @intFromEnum(gc));
+                },
+                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(u5).init(allocator);
+    defer stage2.deinit();
+
+    var stage3 = std.ArrayList(u5).init(allocator);
+    defer stage3.deinit();
+
+    var block: Block = [_]u5{0} ** block_size;
+    var block_len: u16 = 0;
+
+    for (0..0x110000) |i| {
+        const cp: u21 = @intCast(i);
+        const gc = flat_map.get(cp).?;
+
+        const stage3_idx = blk: {
+            for (stage3.items, 0..) |gci, j| {
+                if (gc == gci) break :blk j;
+            }
+            try stage3.append(gc);
+            break :blk stage3.items.len - 1;
+        };
+
+        // Process block
+        block[block_len] = @intCast(stage3_idx);
+        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.deflate.compressor;
+    var out_file = try std.fs.cwd().createFile(output_path, .{});
+    defer out_file.close();
+    var out_comp = try compressor(allocator, out_file.writer(), .{ .level = .best_compression });
+    defer out_comp.deinit();
+    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 writer.writeInt(u8, @intCast(stage3.items.len), endian);
+    for (stage3.items) |i| try writer.writeInt(u8, i, endian);
+
+    try out_comp.flush();
+}
-- 
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