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const std = @import("std");
const builtin = @import("builtin");
pub fn main() !void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
defer arena.deinit();
const allocator = arena.allocator();
// Process UnicodeData.txt
var in_file = try std.fs.cwd().openFile("data/unicode/UnicodeData.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.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();
var line_buf: [4096]u8 = undefined;
lines: while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
if (line.len == 0) continue;
var field_iter = std.mem.splitScalar(u8, line, ';');
var cps: [3]u24 = undefined;
var len: u8 = 2;
var i: usize = 0;
while (field_iter.next()) |field| : (i += 1) {
switch (i) {
0 => cps[0] = try std.fmt.parseInt(u24, field, 16),
5 => {
// Not canonical.
if (field.len == 0 or field[0] == '<') continue :lines;
if (std.mem.indexOfScalar(u8, field, ' ')) |space| {
// Canonical
len = 3;
cps[1] = try std.fmt.parseInt(u24, field[0..space], 16);
cps[2] = try std.fmt.parseInt(u24, field[space + 1 ..], 16);
} else {
// Singleton
cps[1] = try std.fmt.parseInt(u24, field, 16);
}
},
2 => if (line[0] == '<') continue :lines,
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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