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const std = @import("std");
const builtin = @import("builtin");
const compress = std.compress;
const mem = std.mem;
const testing = std.testing;
allocator: mem.Allocator,
s1: []u16 = undefined,
s2: []u8 = undefined,
const Self = @This();
pub fn init(allocator: mem.Allocator) !Self {
const decompressor = compress.deflate.decompressor;
const in_bytes = @embedFile("numeric");
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 stage_1_len: u16 = try reader.readInt(u16, endian);
self.s1 = try allocator.alloc(u16, stage_1_len);
errdefer allocator.free(self.s1);
for (0..stage_1_len) |i| self.s1[i] = try reader.readInt(u16, endian);
const stage_2_len: u16 = try reader.readInt(u16, endian);
self.s2 = try allocator.alloc(u8, stage_2_len);
errdefer allocator.free(self.s2);
_ = try reader.readAll(self.s2);
return self;
}
pub fn deinit(self: *const Self) void {
self.allocator.free(self.s1);
self.allocator.free(self.s2);
}
/// True if `cp` is numeric.
pub inline fn isNumeric(self: Self, cp: u21) bool {
return self.s2[self.s1[cp >> 8] + (cp & 0xff)] & 1 == 1;
}
/// True if `cp` is a digit.
pub inline fn isDigit(self: Self, cp: u21) bool {
return self.s2[self.s1[cp >> 8] + (cp & 0xff)] & 2 == 2;
}
/// True if `cp` is decimal.
pub inline fn isDecimal(self: Self, cp: u21) bool {
return self.s2[self.s1[cp >> 8] + (cp & 0xff)] & 4 == 4;
}
test "isDecimal" {
const self = try init(testing.allocator);
defer self.deinit();
try testing.expect(self.isNumeric('\u{277f}'));
try testing.expect(self.isDigit('\u{2070}'));
try testing.expect(self.isDecimal('3'));
try testing.expect(!self.isNumeric('1'));
try testing.expect(!self.isDigit('2'));
try testing.expect(!self.isDecimal('g'));
}
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