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const std = @import("std");
const builtin = @import("builtin");
const mem = std.mem;
const Allocator = mem.Allocator;
const compress = std.compress;
const unicode = std.unicode;
const CodePoint = @import("code_point").CodePoint;
const CodePointIterator = @import("code_point").Iterator;
s1: []u16 = undefined,
s2: []u6 = undefined,
const Emoji = @This();
// This must be an exact match of `Emoji` from `codegen/emoji.zig`.
pub const Properties = packed struct {
Emoji: bool = false,
Emoji_Presentation: bool = false,
Emoji_Modifier: bool = false,
Emoji_Modifier_Base: bool = false,
Emoji_Component: bool = false,
Extended_Pictographic: bool = false,
};
pub fn init(allocator: Allocator) Allocator.Error!Emoji {
var emoji = Emoji{};
try emoji.setup(allocator);
return emoji;
}
pub fn setup(emoji: *Emoji, allocator: Allocator) Allocator.Error!void {
const decompressor = compress.flate.inflate.decompressor;
const in_bytes = @embedFile("emoji");
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();
const s1_len: u16 = reader.readInt(u16, endian) catch unreachable;
emoji.s1 = try allocator.alloc(u16, s1_len);
errdefer allocator.free(emoji.s1);
for (0..s1_len) |i| emoji.s1[i] = reader.readInt(u16, endian) catch unreachable;
const s2_len: u16 = reader.readInt(u16, endian) catch unreachable;
emoji.s2 = try allocator.alloc(u6, s2_len);
errdefer allocator.free(emoji.s2);
for (0..s2_len) |i| emoji.s2[i] = @intCast(reader.readInt(u8, endian) catch unreachable);
}
pub fn deinit(emoji: *const Emoji, allocator: Allocator) void {
allocator.free(emoji.s1);
allocator.free(emoji.s2);
}
/// Lookup the emoji properties for a code point.
fn properties(emoji: Emoji, cp: u21) Properties {
return @bitCast(emoji.s2[emoji.s1[cp >> 8] + (cp & 0xff)]);
}
pub fn isEmoji(emoji: Emoji, cp: u21) bool {
return properties(emoji, cp).Emoji;
}
pub fn isEmojiPresentation(emoji: Emoji, cp: u21) bool {
return properties(emoji, cp).Emoji_Presentation;
}
pub fn isEmojiModifier(emoji: Emoji, cp: u21) bool {
return properties(emoji, cp).Emoji_Modifier;
}
pub fn isEmojiModifierBase(emoji: Emoji, cp: u21) bool {
return properties(emoji, cp).Emoji_Modifier_Base;
}
pub fn isEmojiComponent(emoji: Emoji, cp: u21) bool {
return properties(emoji, cp).Emoji_Component;
}
pub fn isExtendedPictographic(emoji: Emoji, cp: u21) bool {
return properties(emoji, cp).Extended_Pictographic;
}
test "isEmoji" {
const emoji = try Emoji.init(std.testing.allocator);
defer emoji.deinit(std.testing.allocator);
try std.testing.expect(emoji.isEmoji(0x1F415)); // π
try std.testing.expect(!emoji.isEmoji(0x3042)); // γ
}
test "isEmojiPresentation" {
const emoji = try Emoji.init(std.testing.allocator);
defer emoji.deinit(std.testing.allocator);
try std.testing.expect(emoji.isEmojiPresentation(0x1F408)); // π
try std.testing.expect(!emoji.isEmojiPresentation(0x267E)); // βΎοΈ
}
test "isEmojiModifier" {
const emoji = try Emoji.init(std.testing.allocator);
defer emoji.deinit(std.testing.allocator);
try std.testing.expect(emoji.isEmojiModifier(0x1F3FF)); // πΏ
try std.testing.expect(!emoji.isEmojiModifier(0x1F385)); // π
}
test "isEmojiModifierBase" {
const emoji = try Emoji.init(std.testing.allocator);
defer emoji.deinit(std.testing.allocator);
try std.testing.expect(emoji.isEmojiModifierBase(0x1F977)); // π₯·
try std.testing.expect(!emoji.isEmojiModifierBase(0x1F4F8)); // πΈ
}
test "isEmojiComponent" {
const emoji = try Emoji.init(std.testing.allocator);
defer emoji.deinit(std.testing.allocator);
try std.testing.expect(emoji.isEmojiComponent(0x1F9B0)); // π¦°
try std.testing.expect(!emoji.isEmojiComponent(0x1F9B5)); // π¦΅
}
test "isExtendedPictographic" {
const emoji = try Emoji.init(std.testing.allocator);
defer emoji.deinit(std.testing.allocator);
try std.testing.expect(emoji.isExtendedPictographic(0x1F005)); // π
try std.testing.expect(!emoji.isExtendedPictographic(0x2A)); // *
}
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