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const std = @import("std");
const builtin = @import("builtin");
const compress = std.compress;
const mem = std.mem;
/// Indic syllable type.
pub const Indic = enum {
none,
Consonant,
Extend,
Linker,
};
/// Grapheme break property.
pub const Gbp = enum {
none,
Control,
CR,
Extend,
L,
LF,
LV,
LVT,
Prepend,
Regional_Indicator,
SpacingMark,
T,
V,
ZWJ,
};
allocator: mem.Allocator,
s1: []u16 = undefined,
s2: []u16 = undefined,
s3: []u8 = undefined,
const Self = @This();
pub fn init(allocator: mem.Allocator) !Self {
const decompressor = compress.deflate.decompressor;
const in_bytes = @embedFile("gbp");
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 };
const s1_len: u16 = try reader.readInt(u16, endian);
self.s1 = try allocator.alloc(u16, s1_len);
for (0..s1_len) |i| self.s1[i] = try reader.readInt(u16, endian);
const s2_len: u16 = try reader.readInt(u16, endian);
self.s2 = try allocator.alloc(u16, s2_len);
for (0..s2_len) |i| self.s2[i] = try reader.readInt(u16, endian);
const s3_len: u16 = try reader.readInt(u16, endian);
self.s3 = try allocator.alloc(u8, s3_len);
_ = try reader.readAll(self.s3);
return self;
}
pub fn deinit(self: *Self) void {
self.allocator.free(self.s1);
self.allocator.free(self.s2);
self.allocator.free(self.s3);
}
/// Lookup the grapheme break property for a code point.
pub inline fn gbp(self: Self, cp: u21) Gbp {
return @enumFromInt(self.s3[self.s2[self.s1[cp >> 8] + (cp & 0xff)]] >> 4);
}
/// Lookup the indic syllable type for a code point.
pub inline fn indic(self: Self, cp: u21) Indic {
return @enumFromInt((self.s3[self.s2[self.s1[cp >> 8] + (cp & 0xff)]] >> 1) & 0x7);
}
/// Lookup the indic syllable type for a code point.
pub inline fn isEmoji(self: Self, cp: u21) bool {
return self.s3[self.s2[self.s1[cp >> 8] + (cp & 0xff)]] & 1 == 1;
}
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