From 134a7df8206aa66ca7b0abbc7f31f08410b502d2 Mon Sep 17 00:00:00 2001
From: Jose Colon Rodriguez
Date: Tue, 20 Feb 2024 09:13:36 -0400
Subject: Replaced ccc_map with table. 20ms faster

---
 codegen/normp.zig | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 codegen/normp.zig

(limited to 'codegen')

diff --git a/codegen/normp.zig b/codegen/normp.zig
new file mode 100644
index 0000000..25af65c
--- /dev/null
+++ b/codegen/normp.zig
@@ -0,0 +1,128 @@
+const std = @import("std");
+
+const options = @import("options");
+
+const block_size = 256;
+const Block = [block_size]u8;
+
+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(u8, &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, u8).init(allocator);
+    defer flat_map.deinit();
+
+    var line_buf: [4096]u8 = undefined;
+
+    // Process DerivedEastAsianWidth.txt
+    var cc_file = try std.fs.cwd().openFile("data/unicode/extracted/DerivedCombiningClass.txt", .{});
+    defer cc_file.close();
+    var cc_buf = std.io.bufferedReader(cc_file.reader());
+    const cc_reader = cc_buf.reader();
+
+    while (try cc_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 => {
+                    // Combining Class
+                    if (std.mem.eql(u8, field, "0")) continue;
+                    const cc = try std.fmt.parseInt(u8, field, 10);
+                    for (current_code[0]..current_code[1] + 1) |cp| try flat_map.put(@intCast(cp), cc);
+                },
+                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(u8).init(allocator);
+    defer stage2.deinit();
+
+    var block: Block = [_]u8{0} ** block_size;
+    var block_len: u16 = 0;
+
+    for (0..0x110000) |i| {
+        const cp: u21 = @intCast(i);
+        const cc = flat_map.get(cp) orelse 0;
+
+        // Process block
+        block[block_len] = cc;
+        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!");
+
+    var out_file = try std.fs.cwd().createFile(output_path, .{});
+    defer out_file.close();
+    var out_buf = std.io.bufferedWriter(out_file.writer());
+    const writer = out_buf.writer();
+
+    try writer.writeAll("const std = @import(\"std\");\n");
+
+    try writer.print("const Stage2Int = std.math.IntFittingRange(0, {});\n", .{stage2.items.len});
+    try writer.print("pub const stage_1 = [{}]Stage2Int{{", .{stage1.items.len});
+    for (stage1.items) |v| try writer.print("{},", .{v});
+    try writer.writeAll("};\n");
+
+    try writer.print("pub const stage_2 = [{}]u8{{", .{stage2.items.len});
+    for (stage2.items) |v| try writer.print("{},", .{v});
+    try writer.writeAll("};\n");
+
+    try out_buf.flush();
+}
-- 
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