From 958c13ba442e7077a50d7163fdeb9bba378f95c2 Mon Sep 17 00:00:00 2001
From: Sam Atman
Date: Wed, 30 Apr 2025 15:32:34 -0400
Subject: Rest of the Renamings

These get different names, but don't otherwise change.
---
 src/LetterCasing.zig | 200 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 200 insertions(+)
 create mode 100644 src/LetterCasing.zig

(limited to 'src/LetterCasing.zig')

diff --git a/src/LetterCasing.zig b/src/LetterCasing.zig
new file mode 100644
index 0000000..0a0acb1
--- /dev/null
+++ b/src/LetterCasing.zig
@@ -0,0 +1,200 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const compress = std.compress;
+const mem = std.mem;
+const testing = std.testing;
+const unicode = std.unicode;
+
+const CodePointIterator = @import("code_point").Iterator;
+
+case_map: [][2]u21,
+prop_s1: []u16 = undefined,
+prop_s2: []u8 = undefined,
+
+const Self = @This();
+
+pub fn init(allocator: mem.Allocator) !Self {
+    const decompressor = compress.flate.inflate.decompressor;
+    const endian = builtin.cpu.arch.endian();
+
+    var self = Self{
+        .case_map = try allocator.alloc([2]u21, 0x110000),
+    };
+    errdefer allocator.free(self.case_map);
+
+    for (0..0x110000) |i| {
+        const cp: u21 = @intCast(i);
+        self.case_map[cp] = .{ cp, cp };
+    }
+
+    // Uppercase
+    const upper_bytes = @embedFile("upper");
+    var upper_fbs = std.io.fixedBufferStream(upper_bytes);
+    var upper_decomp = decompressor(.raw, upper_fbs.reader());
+    var upper_reader = upper_decomp.reader();
+
+    while (true) {
+        const cp = try upper_reader.readInt(i24, endian);
+        if (cp == 0) break;
+        const diff = try upper_reader.readInt(i24, endian);
+        self.case_map[@intCast(cp)][0] = @intCast(cp + diff);
+    }
+
+    // Lowercase
+    const lower_bytes = @embedFile("lower");
+    var lower_fbs = std.io.fixedBufferStream(lower_bytes);
+    var lower_decomp = decompressor(.raw, lower_fbs.reader());
+    var lower_reader = lower_decomp.reader();
+
+    while (true) {
+        const cp = try lower_reader.readInt(i24, endian);
+        if (cp == 0) break;
+        const diff = try lower_reader.readInt(i24, endian);
+        self.case_map[@intCast(cp)][1] = @intCast(cp + diff);
+    }
+
+    // Case properties
+    const cp_bytes = @embedFile("case_prop");
+    var cp_fbs = std.io.fixedBufferStream(cp_bytes);
+    var cp_decomp = decompressor(.raw, cp_fbs.reader());
+    var cp_reader = cp_decomp.reader();
+
+    const stage_1_len: u16 = try cp_reader.readInt(u16, endian);
+    self.prop_s1 = try allocator.alloc(u16, stage_1_len);
+    errdefer allocator.free(self.prop_s1);
+    for (0..stage_1_len) |i| self.prop_s1[i] = try cp_reader.readInt(u16, endian);
+
+    const stage_2_len: u16 = try cp_reader.readInt(u16, endian);
+    self.prop_s2 = try allocator.alloc(u8, stage_2_len);
+    errdefer allocator.free(self.prop_s2);
+    _ = try cp_reader.readAll(self.prop_s2);
+
+    return self;
+}
+
+pub fn deinit(self: *const Self, allocator: mem.Allocator) void {
+    allocator.free(self.case_map);
+    allocator.free(self.prop_s1);
+    allocator.free(self.prop_s2);
+}
+
+// Returns true if `cp` is either upper, lower, or title case.
+pub fn isCased(self: Self, cp: u21) bool {
+    return self.prop_s2[self.prop_s1[cp >> 8] + (cp & 0xff)] & 4 == 4;
+}
+
+// Returns true if `cp` is uppercase.
+pub fn isUpper(self: Self, cp: u21) bool {
+    return self.prop_s2[self.prop_s1[cp >> 8] + (cp & 0xff)] & 2 == 2;
+}
+
+/// Returns true if `str` is all uppercase.
+pub fn isUpperStr(self: Self, str: []const u8) bool {
+    var iter = CodePointIterator{ .bytes = str };
+
+    return while (iter.next()) |cp| {
+        if (self.isCased(cp.code) and !self.isUpper(cp.code)) break false;
+    } else true;
+}
+
+test "isUpperStr" {
+    const cd = try init(testing.allocator);
+    defer cd.deinit(testing.allocator);
+
+    try testing.expect(cd.isUpperStr("HELLO, WORLD 2112!"));
+    try testing.expect(!cd.isUpperStr("hello, world 2112!"));
+    try testing.expect(!cd.isUpperStr("Hello, World 2112!"));
+}
+
+/// Returns uppercase mapping for `cp`.
+pub fn toUpper(self: Self, cp: u21) u21 {
+    return self.case_map[cp][0];
+}
+
+/// Returns a new string with all letters in uppercase.
+/// Caller must free returned bytes with `allocator`.
+pub fn toUpperStr(
+    self: Self,
+    allocator: mem.Allocator,
+    str: []const u8,
+) ![]u8 {
+    var bytes = std.ArrayList(u8).init(allocator);
+    defer bytes.deinit();
+
+    var iter = CodePointIterator{ .bytes = str };
+    var buf: [4]u8 = undefined;
+
+    while (iter.next()) |cp| {
+        const len = try unicode.utf8Encode(self.toUpper(cp.code), &buf);
+        try bytes.appendSlice(buf[0..len]);
+    }
+
+    return try bytes.toOwnedSlice();
+}
+
+test "toUpperStr" {
+    const cd = try init(testing.allocator);
+    defer cd.deinit(testing.allocator);
+
+    const uppered = try cd.toUpperStr(testing.allocator, "Hello, World 2112!");
+    defer testing.allocator.free(uppered);
+    try testing.expectEqualStrings("HELLO, WORLD 2112!", uppered);
+}
+
+// Returns true if `cp` is lowercase.
+pub fn isLower(self: Self, cp: u21) bool {
+    return self.prop_s2[self.prop_s1[cp >> 8] + (cp & 0xff)] & 1 == 1;
+}
+
+/// Returns true if `str` is all lowercase.
+pub fn isLowerStr(self: Self, str: []const u8) bool {
+    var iter = CodePointIterator{ .bytes = str };
+
+    return while (iter.next()) |cp| {
+        if (self.isCased(cp.code) and !self.isLower(cp.code)) break false;
+    } else true;
+}
+
+test "isLowerStr" {
+    const cd = try init(testing.allocator);
+    defer cd.deinit(testing.allocator);
+
+    try testing.expect(cd.isLowerStr("hello, world 2112!"));
+    try testing.expect(!cd.isLowerStr("HELLO, WORLD 2112!"));
+    try testing.expect(!cd.isLowerStr("Hello, World 2112!"));
+}
+
+/// Returns lowercase mapping for `cp`.
+pub fn toLower(self: Self, cp: u21) u21 {
+    return self.case_map[cp][1];
+}
+
+/// Returns a new string with all letters in lowercase.
+/// Caller must free returned bytes with `allocator`.
+pub fn toLowerStr(
+    self: Self,
+    allocator: mem.Allocator,
+    str: []const u8,
+) ![]u8 {
+    var bytes = std.ArrayList(u8).init(allocator);
+    defer bytes.deinit();
+
+    var iter = CodePointIterator{ .bytes = str };
+    var buf: [4]u8 = undefined;
+
+    while (iter.next()) |cp| {
+        const len = try unicode.utf8Encode(self.toLower(cp.code), &buf);
+        try bytes.appendSlice(buf[0..len]);
+    }
+
+    return try bytes.toOwnedSlice();
+}
+
+test "toLowerStr" {
+    const cd = try init(testing.allocator);
+    defer cd.deinit(testing.allocator);
+
+    const lowered = try cd.toLowerStr(testing.allocator, "Hello, World 2112!");
+    defer testing.allocator.free(lowered);
+    try testing.expectEqualStrings("hello, world 2112!", lowered);
+}
-- 
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