1 files changed, 132 insertions, 0 deletions

diff --git a/src/Emoji.zig b/src/Emoji.zig
new file mode 100644
index 0000000..75b44c2
--- /dev/null
+++ b/src/Emoji.zig
@@ -0,0 +1,132 @@
+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)); // 🐕
+    try std.testing.expect(!emoji.isEmoji(0x3042)); // あ
+}
+
+test "isEmojiPresentation" {
+    const emoji = try Emoji.init(std.testing.allocator);
+    defer emoji.deinit(std.testing.allocator);
+
+    try std.testing.expect(emoji.isEmojiPresentation(0x1F408)); // 🐈
+    try std.testing.expect(!emoji.isEmojiPresentation(0x267E)); // ♾
+}
+
+test "isEmojiModifier" {
+    const emoji = try Emoji.init(std.testing.allocator);
+    defer emoji.deinit(std.testing.allocator);
+
+    try std.testing.expect(emoji.isEmojiModifier(0x1F3FF)); // 🏿
+    try std.testing.expect(!emoji.isEmojiModifier(0x1F385)); // 🎅
+}
+
+test "isEmojiModifierBase" {
+    const emoji = try Emoji.init(std.testing.allocator);
+    defer emoji.deinit(std.testing.allocator);
+
+    try std.testing.expect(emoji.isEmojiModifierBase(0x1F977)); // 🥷
+    try std.testing.expect(!emoji.isEmojiModifierBase(0x1F4F8)); // 📸
+}
+
+test "isEmojiComponent" {
+    const emoji = try Emoji.init(std.testing.allocator);
+    defer emoji.deinit(std.testing.allocator);
+
+    try std.testing.expect(emoji.isEmojiComponent(0x1F9B0)); // 🦰
+    try std.testing.expect(!emoji.isEmojiComponent(0x1F9B5)); // 🦵
+}
+
+test "isExtendedPictographic" {
+    const emoji = try Emoji.init(std.testing.allocator);
+    defer emoji.deinit(std.testing.allocator);
+
+    try std.testing.expect(emoji.isExtendedPictographic(0x1F005)); // 🀅
+    try std.testing.expect(!emoji.isExtendedPictographic(0x2A)); // *
+}