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const std = @import("std");
const builtin = @import("builtin");
const fmt = std.fmt;
const mem = std.mem;
pub fn main() !void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
defer arena.deinit();
const allocator = arena.allocator();
// Process DerivedEastAsianWidth.txt
var in_file = try std.fs.cwd().openFile("data/unicode/CaseFolding.txt", .{});
defer in_file.close();
var in_buf = std.io.bufferedReader(in_file.reader());
const in_reader = in_buf.reader();
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();
var line_buf: [4096]u8 = undefined;
lines: while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
if (line.len == 0 or line[0] == '#') continue;
const no_comment = if (mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
var field_iter = mem.tokenizeSequence(u8, no_comment, "; ");
var cps: [4]u24 = undefined;
var len: usize = 2;
var i: usize = 0;
while (field_iter.next()) |field| : (i += 1) {
switch (i) {
0 => cps[0] = try fmt.parseInt(u24, field, 16),
1 => {
if (!mem.eql(u8, field, "C") and !mem.eql(u8, field, "F")) continue :lines;
if (mem.eql(u8, field, "F")) len = 3;
},
2 => {
if (len == 3) {
// Full case fold
// std.debug.print("-->{s} {s}\n", .{ line, field });
var cp_iter = mem.tokenizeScalar(u8, field, ' ');
len = 1;
while (cp_iter.next()) |cp_str| : (len += 1) {
cps[len] = try fmt.parseInt(u24, cp_str, 16);
}
} else {
// Common case fold
cps[1] = try fmt.parseInt(u24, field, 16);
}
},
else => {},
}
}
try writer.writeInt(u8, @intCast(len), endian);
for (cps[0..len]) |cp| try writer.writeInt(u24, cp, endian);
}
try writer.writeInt(u16, 0, endian);
try out_comp.flush();
}
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