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const std = @import("std");
const builtin = @import("builtin");
const compress = std.compress;
const mem = std.mem;
allocator: mem.Allocator,
fold: [][]u21 = undefined,
cwcf: []bool = undefined,
const Self = @This();
pub fn init(allocator: mem.Allocator) !Self {
const decompressor = compress.deflate.decompressor;
const in_bytes = @embedFile("fold");
var in_fbs = std.io.fixedBufferStream(in_bytes);
var in_decomp = try decompressor(allocator, in_fbs.reader(), null);
defer in_decomp.deinit();
var reader = in_decomp.reader();
const endian = builtin.cpu.arch.endian();
var self = Self{
.allocator = allocator,
.fold = try allocator.alloc([]u21, 0x110000),
.cwcf = try allocator.alloc(bool, 0x110000),
};
@memset(self.fold, &.{});
@memset(self.cwcf, false);
while (true) {
const len: u8 = try reader.readInt(u8, endian);
if (len == 0) break;
const cp = try reader.readInt(u24, endian);
self.fold[cp >> 1] = try allocator.alloc(u21, len - 1);
for (0..len - 1) |i| {
self.fold[cp >> 1][i] = @intCast(try reader.readInt(u24, endian));
}
self.cwcf[cp >> 1] = cp & 1 == 1;
}
return self;
}
pub fn deinit(self: *Self) void {
for (self.fold) |slice| self.allocator.free(slice);
self.allocator.free(self.fold);
self.allocator.free(self.cwcf);
}
/// Returns the case fold for `cp`.
pub inline fn caseFold(self: Self, cp: u21) []const u21 {
return self.fold[cp];
}
/// Returns true when caseFold(NFD(`cp`)) != NFD(`cp`).
pub inline fn changesWhenCaseFolded(self: Self, cp: u21) bool {
return self.cwcf[cp];
}
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