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const std = @import("std");
const builtin = @import("builtin");
pub fn main() anyerror!void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
defer arena.deinit();
const allocator = arena.allocator();
var write_buf: [4096]u8 = undefined;
// Process UnicodeData.txt
var in_reader = std.io.Reader.fixed(@embedFile("UnicodeData.txt"));
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 file_writer = out_file.writer(&write_buf);
const endian = builtin.cpu.arch.endian();
lines: while (in_reader.takeDelimiterInclusive('\n')) |took| {
const line = std.mem.trimRight(u8, took, "\n");
if (line.len == 0) continue;
var field_iter = std.mem.splitScalar(u8, line, ';');
var cp: i24 = undefined;
var i: usize = 0;
while (field_iter.next()) |field| : (i += 1) {
switch (i) {
0 => cp = try std.fmt.parseInt(i24, field, 16),
2 => if (line[0] == '<') continue :lines,
12 => {
// Simple uppercase mapping
if (field.len == 0) continue :lines;
try file_writer.interface.writeInt(i24, cp, endian);
const mapping = try std.fmt.parseInt(i24, field, 16);
try file_writer.interface.writeInt(i24, mapping - cp, endian);
},
else => {},
}
}
} else |err| switch (err) {
error.EndOfStream => {},
else => {
return err;
},
}
try file_writer.interface.writeInt(u24, 0, endian);
try file_writer.interface.flush();
}
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