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//! Canonicalization Data
nfc: std.AutoHashMapUnmanaged([2]u21, u21),
nfd: [][]u21 = undefined,
const CanonData = @This();
pub fn init(allocator: mem.Allocator) !CanonData {
const decompressor = compress.flate.inflate.decompressor;
const in_bytes = @embedFile("canon");
var in_fbs = std.io.fixedBufferStream(in_bytes);
var in_decomp = decompressor(.raw, in_fbs.reader());
var reader = in_decomp.reader();
const endian = builtin.cpu.arch.endian();
var cdata = CanonData{
.nfc = .empty,
.nfd = try allocator.alloc([]u21, 0x110000),
};
var _cp: u24 = undefined;
errdefer {
cdata.nfc.deinit(allocator);
for (cdata.nfd[0.._cp]) |slice| allocator.free(slice);
allocator.free(cdata.nfd);
}
@memset(cdata.nfd, &.{});
while (true) {
const len: u8 = try reader.readInt(u8, endian);
if (len == 0) break;
const cp = try reader.readInt(u24, endian);
_cp = cp;
const nfd_cp = try allocator.alloc(u21, len - 1);
errdefer allocator.free(nfd_cp);
for (0..len - 1) |i| {
nfd_cp[i] = @intCast(try reader.readInt(u24, endian));
}
if (len == 3) {
try cdata.nfc.put(allocator, nfd_cp[0..2].*, @intCast(cp));
}
cdata.nfd[cp] = nfd_cp;
}
return cdata;
}
pub fn deinit(cdata: *CanonData, allocator: mem.Allocator) void {
cdata.nfc.deinit(allocator);
for (cdata.nfd) |slice| allocator.free(slice);
allocator.free(cdata.nfd);
}
/// Returns canonical decomposition for `cp`.
pub fn toNfd(cdata: *const CanonData, cp: u21) []const u21 {
return cdata.nfd[cp];
}
// Returns the primary composite for the codepoints in `cp`.
pub fn toNfc(cdata: *const CanonData, cps: [2]u21) ?u21 {
return cdata.nfc.get(cps);
}
const std = @import("std");
const builtin = @import("builtin");
const compress = std.compress;
const mem = std.mem;
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