[TextServer] Implement ICU/UAX 31 based `is_valid_identifier` function.

core/string/char_range.inc

@@ -0,0 +1,1456 @@
+/*************************************************************************/
+/*  char_range.inc                                                       */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef CHAR_RANGE_INC
+#define CHAR_RANGE_INC
+
+#include "core/typedefs.h"
+
+struct CharRange {
+	char32_t start;
+	char32_t end;
+};
+
+static CharRange xid_start[] = {
+	{ 0x41, 0x5a },
+	{ 0x5f, 0x5f },
+	{ 0x61, 0x7a },
+	{ 0xaa, 0xaa },
+	{ 0xb5, 0xb5 },
+	{ 0xba, 0xba },
+	{ 0xc0, 0xd6 },
+	{ 0xd8, 0xf6 },
+	{ 0xf8, 0x2c1 },
+	{ 0x2c6, 0x2d1 },
+	{ 0x2e0, 0x2e4 },
+	{ 0x2ec, 0x2ec },
+	{ 0x2ee, 0x2ee },
+	{ 0x370, 0x374 },
+	{ 0x376, 0x377 },
+	{ 0x37a, 0x37d },
+	{ 0x37f, 0x37f },
+	{ 0x386, 0x386 },
+	{ 0x388, 0x38a },
+	{ 0x38c, 0x38c },
+	{ 0x38e, 0x3a1 },
+	{ 0x3a3, 0x3f5 },
+	{ 0x3f7, 0x481 },
+	{ 0x48a, 0x52f },
+	{ 0x531, 0x556 },
+	{ 0x559, 0x559 },
+	{ 0x560, 0x588 },
+	{ 0x5d0, 0x5ea },
+	{ 0x5ef, 0x5f2 },
+	{ 0x620, 0x64a },
+	{ 0x66e, 0x66f },
+	{ 0x671, 0x6d3 },
+	{ 0x6d5, 0x6d5 },
+	{ 0x6e5, 0x6e6 },
+	{ 0x6ee, 0x6ef },
+	{ 0x6fa, 0x6fc },
+	{ 0x6ff, 0x6ff },
+	{ 0x710, 0x710 },
+	{ 0x712, 0x72f },
+	{ 0x74d, 0x7a5 },
+	{ 0x7b1, 0x7b1 },
+	{ 0x7ca, 0x7ea },
+	{ 0x7f4, 0x7f5 },
+	{ 0x7fa, 0x7fa },
+	{ 0x800, 0x815 },
+	{ 0x81a, 0x81a },
+	{ 0x824, 0x824 },
+	{ 0x828, 0x828 },
+	{ 0x840, 0x858 },
+	{ 0x860, 0x86a },
+	{ 0x870, 0x887 },
+	{ 0x889, 0x88e },
+	{ 0x8a0, 0x8c9 },
+	{ 0x904, 0x939 },
+	{ 0x93d, 0x93d },
+	{ 0x950, 0x950 },
+	{ 0x958, 0x961 },
+	{ 0x971, 0x980 },
+	{ 0x985, 0x98c },
+	{ 0x98f, 0x990 },
+	{ 0x993, 0x9a8 },
+	{ 0x9aa, 0x9b0 },
+	{ 0x9b2, 0x9b2 },
+	{ 0x9b6, 0x9b9 },
+	{ 0x9bd, 0x9bd },
+	{ 0x9ce, 0x9ce },
+	{ 0x9dc, 0x9dd },
+	{ 0x9df, 0x9e1 },
+	{ 0x9f0, 0x9f1 },
+	{ 0x9fc, 0x9fc },
+	{ 0xa05, 0xa0a },
+	{ 0xa0f, 0xa10 },
+	{ 0xa13, 0xa28 },
+	{ 0xa2a, 0xa30 },
+	{ 0xa32, 0xa33 },
+	{ 0xa35, 0xa36 },
+	{ 0xa38, 0xa39 },
+	{ 0xa59, 0xa5c },
+	{ 0xa5e, 0xa5e },
+	{ 0xa72, 0xa74 },
+	{ 0xa85, 0xa8d },
+	{ 0xa8f, 0xa91 },
+	{ 0xa93, 0xaa8 },
+	{ 0xaaa, 0xab0 },
+	{ 0xab2, 0xab3 },
+	{ 0xab5, 0xab9 },
+	{ 0xabd, 0xabd },
+	{ 0xad0, 0xad0 },
+	{ 0xae0, 0xae1 },
+	{ 0xaf9, 0xaf9 },
+	{ 0xb05, 0xb0c },
+	{ 0xb0f, 0xb10 },
+	{ 0xb13, 0xb28 },
+	{ 0xb2a, 0xb30 },
+	{ 0xb32, 0xb33 },
+	{ 0xb35, 0xb39 },
+	{ 0xb3d, 0xb3d },
+	{ 0xb5c, 0xb5d },
+	{ 0xb5f, 0xb61 },
+	{ 0xb71, 0xb71 },
+	{ 0xb83, 0xb83 },
+	{ 0xb85, 0xb8a },
+	{ 0xb8e, 0xb90 },
+	{ 0xb92, 0xb95 },
+	{ 0xb99, 0xb9a },
+	{ 0xb9c, 0xb9c },
+	{ 0xb9e, 0xb9f },
+	{ 0xba3, 0xba4 },
+	{ 0xba8, 0xbaa },
+	{ 0xbae, 0xbb9 },
+	{ 0xbd0, 0xbd0 },
+	{ 0xc05, 0xc0c },
+	{ 0xc0e, 0xc10 },
+	{ 0xc12, 0xc28 },
+	{ 0xc2a, 0xc39 },
+	{ 0xc3d, 0xc3d },
+	{ 0xc58, 0xc5a },
+	{ 0xc5d, 0xc5d },
+	{ 0xc60, 0xc61 },
+	{ 0xc80, 0xc80 },
+	{ 0xc85, 0xc8c },
+	{ 0xc8e, 0xc90 },
+	{ 0xc92, 0xca8 },
+	{ 0xcaa, 0xcb3 },
+	{ 0xcb5, 0xcb9 },
+	{ 0xcbd, 0xcbd },
+	{ 0xcdd, 0xcde },
+	{ 0xce0, 0xce1 },
+	{ 0xcf1, 0xcf2 },
+	{ 0xd04, 0xd0c },
+	{ 0xd0e, 0xd10 },
+	{ 0xd12, 0xd3a },
+	{ 0xd3d, 0xd3d },
+	{ 0xd4e, 0xd4e },
+	{ 0xd54, 0xd56 },
+	{ 0xd5f, 0xd61 },
+	{ 0xd7a, 0xd7f },
+	{ 0xd85, 0xd96 },
+	{ 0xd9a, 0xdb1 },
+	{ 0xdb3, 0xdbb },
+	{ 0xdbd, 0xdbd },
+	{ 0xdc0, 0xdc6 },
+	{ 0xe01, 0xe30 },
+	{ 0xe32, 0xe33 },
+	{ 0xe40, 0xe46 },
+	{ 0xe81, 0xe82 },
+	{ 0xe84, 0xe84 },
+	{ 0xe86, 0xe8a },
+	{ 0xe8c, 0xea3 },
+	{ 0xea5, 0xea5 },
+	{ 0xea7, 0xeb0 },
+	{ 0xeb2, 0xeb3 },
+	{ 0xebd, 0xebd },
+	{ 0xec0, 0xec4 },
+	{ 0xec6, 0xec6 },
+	{ 0xedc, 0xedf },
+	{ 0xf00, 0xf00 },
+	{ 0xf40, 0xf47 },
+	{ 0xf49, 0xf6c },
+	{ 0xf88, 0xf8c },
+	{ 0x1000, 0x102a },
+	{ 0x103f, 0x103f },
+	{ 0x1050, 0x1055 },
+	{ 0x105a, 0x105d },
+	{ 0x1061, 0x1061 },
+	{ 0x1065, 0x1066 },
+	{ 0x106e, 0x1070 },
+	{ 0x1075, 0x1081 },
+	{ 0x108e, 0x108e },
+	{ 0x10a0, 0x10c5 },
+	{ 0x10c7, 0x10c7 },
+	{ 0x10cd, 0x10cd },
+	{ 0x10d0, 0x10fa },
+	{ 0x10fc, 0x1248 },
+	{ 0x124a, 0x124d },
+	{ 0x1250, 0x1256 },
+	{ 0x1258, 0x1258 },
+	{ 0x125a, 0x125d },
+	{ 0x1260, 0x1288 },
+	{ 0x128a, 0x128d },
+	{ 0x1290, 0x12b0 },
+	{ 0x12b2, 0x12b5 },
+	{ 0x12b8, 0x12be },
+	{ 0x12c0, 0x12c0 },
+	{ 0x12c2, 0x12c5 },
+	{ 0x12c8, 0x12d6 },
+	{ 0x12d8, 0x1310 },
+	{ 0x1312, 0x1315 },
+	{ 0x1318, 0x135a },
+	{ 0x1380, 0x138f },
+	{ 0x13a0, 0x13f5 },
+	{ 0x13f8, 0x13fd },
+	{ 0x1401, 0x166c },
+	{ 0x166f, 0x167f },
+	{ 0x1681, 0x169a },
+	{ 0x16a0, 0x16ea },
+	{ 0x16ee, 0x16f8 },
+	{ 0x1700, 0x1711 },
+	{ 0x171f, 0x1731 },
+	{ 0x1740, 0x1751 },
+	{ 0x1760, 0x176c },
+	{ 0x176e, 0x1770 },
+	{ 0x1780, 0x17b3 },
+	{ 0x17d7, 0x17d7 },
+	{ 0x17dc, 0x17dc },
+	{ 0x1820, 0x1878 },
+	{ 0x1880, 0x1884 },
+	{ 0x1887, 0x18a8 },
+	{ 0x18aa, 0x18aa },
+	{ 0x18b0, 0x18f5 },
+	{ 0x1900, 0x191e },
+	{ 0x1950, 0x196d },
+	{ 0x1970, 0x1974 },
+	{ 0x1980, 0x19ab },
+	{ 0x19b0, 0x19c9 },
+	{ 0x1a00, 0x1a16 },
+	{ 0x1a20, 0x1a54 },
+	{ 0x1aa7, 0x1aa7 },
+	{ 0x1b05, 0x1b33 },
+	{ 0x1b45, 0x1b4c },
+	{ 0x1b83, 0x1ba0 },
+	{ 0x1bae, 0x1baf },
+	{ 0x1bba, 0x1be5 },
+	{ 0x1c00, 0x1c23 },
+	{ 0x1c4d, 0x1c4f },
+	{ 0x1c5a, 0x1c7d },
+	{ 0x1c80, 0x1c88 },
+	{ 0x1c90, 0x1cba },
+	{ 0x1cbd, 0x1cbf },
+	{ 0x1ce9, 0x1cec },
+	{ 0x1cee, 0x1cf3 },
+	{ 0x1cf5, 0x1cf6 },
+	{ 0x1cfa, 0x1cfa },
+	{ 0x1d00, 0x1dbf },
+	{ 0x1e00, 0x1f15 },
+	{ 0x1f18, 0x1f1d },
+	{ 0x1f20, 0x1f45 },
+	{ 0x1f48, 0x1f4d },
+	{ 0x1f50, 0x1f57 },
+	{ 0x1f59, 0x1f59 },
+	{ 0x1f5b, 0x1f5b },
+	{ 0x1f5d, 0x1f5d },
+	{ 0x1f5f, 0x1f7d },
+	{ 0x1f80, 0x1fb4 },
+	{ 0x1fb6, 0x1fbc },
+	{ 0x1fbe, 0x1fbe },
+	{ 0x1fc2, 0x1fc4 },
+	{ 0x1fc6, 0x1fcc },
+	{ 0x1fd0, 0x1fd3 },
+	{ 0x1fd6, 0x1fdb },
+	{ 0x1fe0, 0x1fec },
+	{ 0x1ff2, 0x1ff4 },
+	{ 0x1ff6, 0x1ffc },
+	{ 0x2071, 0x2071 },
+	{ 0x207f, 0x207f },
+	{ 0x2090, 0x209c },
+	{ 0x2102, 0x2102 },
+	{ 0x2107, 0x2107 },
+	{ 0x210a, 0x2113 },
+	{ 0x2115, 0x2115 },
+	{ 0x2118, 0x211d },
+	{ 0x2124, 0x2124 },
+	{ 0x2126, 0x2126 },
+	{ 0x2128, 0x2128 },
+	{ 0x212a, 0x2139 },
+	{ 0x213c, 0x213f },
+	{ 0x2145, 0x2149 },
+	{ 0x214e, 0x214e },
+	{ 0x2160, 0x2188 },
+	{ 0x2c00, 0x2ce4 },
+	{ 0x2ceb, 0x2cee },
+	{ 0x2cf2, 0x2cf3 },
+	{ 0x2d00, 0x2d25 },
+	{ 0x2d27, 0x2d27 },
+	{ 0x2d2d, 0x2d2d },
+	{ 0x2d30, 0x2d67 },
+	{ 0x2d6f, 0x2d6f },
+	{ 0x2d80, 0x2d96 },
+	{ 0x2da0, 0x2da6 },
+	{ 0x2da8, 0x2dae },
+	{ 0x2db0, 0x2db6 },
+	{ 0x2db8, 0x2dbe },
+	{ 0x2dc0, 0x2dc6 },
+	{ 0x2dc8, 0x2dce },
+	{ 0x2dd0, 0x2dd6 },
+	{ 0x2dd8, 0x2dde },
+	{ 0x3005, 0x3007 },
+	{ 0x3021, 0x3029 },
+	{ 0x3031, 0x3035 },
+	{ 0x3038, 0x303c },
+	{ 0x3041, 0x3096 },
+	{ 0x309b, 0x309f },
+	{ 0x30a1, 0x30fa },
+	{ 0x30fc, 0x30ff },
+	{ 0x3105, 0x312f },
+	{ 0x3131, 0x318e },
+	{ 0x31a0, 0x31bf },
+	{ 0x31f0, 0x31ff },
+	{ 0x3400, 0x4dbf },
+	{ 0x4e00, 0xa48c },
+	{ 0xa4d0, 0xa4fd },
+	{ 0xa500, 0xa60c },
+	{ 0xa610, 0xa61f },
+	{ 0xa62a, 0xa62b },
+	{ 0xa640, 0xa66e },
+	{ 0xa67f, 0xa69d },
+	{ 0xa6a0, 0xa6ef },
+	{ 0xa717, 0xa71f },
+	{ 0xa722, 0xa788 },
+	{ 0xa78b, 0xa7ca },
+	{ 0xa7d0, 0xa7d1 },
+	{ 0xa7d3, 0xa7d3 },
+	{ 0xa7d5, 0xa7d9 },
+	{ 0xa7f2, 0xa801 },
+	{ 0xa803, 0xa805 },
+	{ 0xa807, 0xa80a },
+	{ 0xa80c, 0xa822 },
+	{ 0xa840, 0xa873 },
+	{ 0xa882, 0xa8b3 },
+	{ 0xa8f2, 0xa8f7 },
+	{ 0xa8fb, 0xa8fb },
+	{ 0xa8fd, 0xa8fe },
+	{ 0xa90a, 0xa925 },
+	{ 0xa930, 0xa946 },
+	{ 0xa960, 0xa97c },
+	{ 0xa984, 0xa9b2 },
+	{ 0xa9cf, 0xa9cf },
+	{ 0xa9e0, 0xa9e4 },
+	{ 0xa9e6, 0xa9ef },
+	{ 0xa9fa, 0xa9fe },
+	{ 0xaa00, 0xaa28 },
+	{ 0xaa40, 0xaa42 },
+	{ 0xaa44, 0xaa4b },
+	{ 0xaa60, 0xaa76 },
+	{ 0xaa7a, 0xaa7a },
+	{ 0xaa7e, 0xaaaf },
+	{ 0xaab1, 0xaab1 },
+	{ 0xaab5, 0xaab6 },
+	{ 0xaab9, 0xaabd },
+	{ 0xaac0, 0xaac0 },
+	{ 0xaac2, 0xaac2 },
+	{ 0xaadb, 0xaadd },
+	{ 0xaae0, 0xaaea },
+	{ 0xaaf2, 0xaaf4 },
+	{ 0xab01, 0xab06 },
+	{ 0xab09, 0xab0e },
+	{ 0xab11, 0xab16 },
+	{ 0xab20, 0xab26 },
+	{ 0xab28, 0xab2e },
+	{ 0xab30, 0xab5a },
+	{ 0xab5c, 0xab69 },
+	{ 0xab70, 0xabe2 },
+	{ 0xac00, 0xd7a3 },
+	{ 0xd7b0, 0xd7c6 },
+	{ 0xd7cb, 0xd7fb },
+	{ 0xf900, 0xfa6d },
+	{ 0xfa70, 0xfad9 },
+	{ 0xfb00, 0xfb06 },
+	{ 0xfb13, 0xfb17 },
+	{ 0xfb1d, 0xfb1d },
+	{ 0xfb1f, 0xfb28 },
+	{ 0xfb2a, 0xfb36 },
+	{ 0xfb38, 0xfb3c },
+	{ 0xfb3e, 0xfb3e },
+	{ 0xfb40, 0xfb41 },
+	{ 0xfb43, 0xfb44 },
+	{ 0xfb46, 0xfbb1 },
+	{ 0xfbd3, 0xfd3d },
+	{ 0xfd50, 0xfd8f },
+	{ 0xfd92, 0xfdc7 },
+	{ 0xfdf0, 0xfdfb },
+	{ 0xfe70, 0xfe74 },
+	{ 0xfe76, 0xfefc },
+	{ 0xff21, 0xff3a },
+	{ 0xff41, 0xff5a },
+	{ 0xff66, 0xffbe },
+	{ 0xffc2, 0xffc7 },
+	{ 0xffca, 0xffcf },
+	{ 0xffd2, 0xffd7 },
+	{ 0xffda, 0xffdc },
+	{ 0x10000, 0x1000b },
+	{ 0x1000d, 0x10026 },
+	{ 0x10028, 0x1003a },
+	{ 0x1003c, 0x1003d },
+	{ 0x1003f, 0x1004d },
+	{ 0x10050, 0x1005d },
+	{ 0x10080, 0x100fa },
+	{ 0x10140, 0x10174 },
+	{ 0x10280, 0x1029c },
+	{ 0x102a0, 0x102d0 },
+	{ 0x10300, 0x1031f },
+	{ 0x1032d, 0x1034a },
+	{ 0x10350, 0x10375 },
+	{ 0x10380, 0x1039d },
+	{ 0x103a0, 0x103c3 },
+	{ 0x103c8, 0x103cf },
+	{ 0x103d1, 0x103d5 },
+	{ 0x10400, 0x1049d },
+	{ 0x104b0, 0x104d3 },
+	{ 0x104d8, 0x104fb },
+	{ 0x10500, 0x10527 },
+	{ 0x10530, 0x10563 },
+	{ 0x10570, 0x1057a },
+	{ 0x1057c, 0x1058a },
+	{ 0x1058c, 0x10592 },
+	{ 0x10594, 0x10595 },
+	{ 0x10597, 0x105a1 },
+	{ 0x105a3, 0x105b1 },
+	{ 0x105b3, 0x105b9 },
+	{ 0x105bb, 0x105bc },
+	{ 0x10600, 0x10736 },
+	{ 0x10740, 0x10755 },
+	{ 0x10760, 0x10767 },
+	{ 0x10780, 0x10785 },
+	{ 0x10787, 0x107b0 },
+	{ 0x107b2, 0x107ba },
+	{ 0x10800, 0x10805 },
+	{ 0x10808, 0x10808 },
+	{ 0x1080a, 0x10835 },
+	{ 0x10837, 0x10838 },
+	{ 0x1083c, 0x1083c },
+	{ 0x1083f, 0x10855 },
+	{ 0x10860, 0x10876 },
+	{ 0x10880, 0x1089e },
+	{ 0x108e0, 0x108f2 },
+	{ 0x108f4, 0x108f5 },
+	{ 0x10900, 0x10915 },
+	{ 0x10920, 0x10939 },
+	{ 0x10980, 0x109b7 },
+	{ 0x109be, 0x109bf },
+	{ 0x10a00, 0x10a00 },
+	{ 0x10a10, 0x10a13 },
+	{ 0x10a15, 0x10a17 },
+	{ 0x10a19, 0x10a35 },
+	{ 0x10a60, 0x10a7c },
+	{ 0x10a80, 0x10a9c },
+	{ 0x10ac0, 0x10ac7 },
+	{ 0x10ac9, 0x10ae4 },
+	{ 0x10b00, 0x10b35 },
+	{ 0x10b40, 0x10b55 },
+	{ 0x10b60, 0x10b72 },
+	{ 0x10b80, 0x10b91 },
+	{ 0x10c00, 0x10c48 },
+	{ 0x10c80, 0x10cb2 },
+	{ 0x10cc0, 0x10cf2 },
+	{ 0x10d00, 0x10d23 },
+	{ 0x10e80, 0x10ea9 },
+	{ 0x10eb0, 0x10eb1 },
+	{ 0x10f00, 0x10f1c },
+	{ 0x10f27, 0x10f27 },
+	{ 0x10f30, 0x10f45 },
+	{ 0x10f70, 0x10f81 },
+	{ 0x10fb0, 0x10fc4 },
+	{ 0x10fe0, 0x10ff6 },
+	{ 0x11003, 0x11037 },
+	{ 0x11071, 0x11072 },
+	{ 0x11075, 0x11075 },
+	{ 0x11083, 0x110af },
+	{ 0x110d0, 0x110e8 },
+	{ 0x11103, 0x11126 },
+	{ 0x11144, 0x11144 },
+	{ 0x11147, 0x11147 },
+	{ 0x11150, 0x11172 },
+	{ 0x11176, 0x11176 },
+	{ 0x11183, 0x111b2 },
+	{ 0x111c1, 0x111c4 },
+	{ 0x111da, 0x111da },
+	{ 0x111dc, 0x111dc },
+	{ 0x11200, 0x11211 },
+	{ 0x11213, 0x1122b },
+	{ 0x11280, 0x11286 },
+	{ 0x11288, 0x11288 },
+	{ 0x1128a, 0x1128d },
+	{ 0x1128f, 0x1129d },
+	{ 0x1129f, 0x112a8 },
+	{ 0x112b0, 0x112de },
+	{ 0x11305, 0x1130c },
+	{ 0x1130f, 0x11310 },
+	{ 0x11313, 0x11328 },
+	{ 0x1132a, 0x11330 },
+	{ 0x11332, 0x11333 },
+	{ 0x11335, 0x11339 },
+	{ 0x1133d, 0x1133d },
+	{ 0x11350, 0x11350 },
+	{ 0x1135d, 0x11361 },
+	{ 0x11400, 0x11434 },
+	{ 0x11447, 0x1144a },
+	{ 0x1145f, 0x11461 },
+	{ 0x11480, 0x114af },
+	{ 0x114c4, 0x114c5 },
+	{ 0x114c7, 0x114c7 },
+	{ 0x11580, 0x115ae },
+	{ 0x115d8, 0x115db },
+	{ 0x11600, 0x1162f },
+	{ 0x11644, 0x11644 },
+	{ 0x11680, 0x116aa },
+	{ 0x116b8, 0x116b8 },
+	{ 0x11700, 0x1171a },
+	{ 0x11740, 0x11746 },
+	{ 0x11800, 0x1182b },
+	{ 0x118a0, 0x118df },
+	{ 0x118ff, 0x11906 },
+	{ 0x11909, 0x11909 },
+	{ 0x1190c, 0x11913 },
+	{ 0x11915, 0x11916 },
+	{ 0x11918, 0x1192f },
+	{ 0x1193f, 0x1193f },
+	{ 0x11941, 0x11941 },
+	{ 0x119a0, 0x119a7 },
+	{ 0x119aa, 0x119d0 },
+	{ 0x119e1, 0x119e1 },
+	{ 0x119e3, 0x119e3 },
+	{ 0x11a00, 0x11a00 },
+	{ 0x11a0b, 0x11a32 },
+	{ 0x11a3a, 0x11a3a },
+	{ 0x11a50, 0x11a50 },
+	{ 0x11a5c, 0x11a89 },
+	{ 0x11a9d, 0x11a9d },
+	{ 0x11ab0, 0x11af8 },
+	{ 0x11c00, 0x11c08 },
+	{ 0x11c0a, 0x11c2e },
+	{ 0x11c40, 0x11c40 },
+	{ 0x11c72, 0x11c8f },
+	{ 0x11d00, 0x11d06 },
+	{ 0x11d08, 0x11d09 },
+	{ 0x11d0b, 0x11d30 },
+	{ 0x11d46, 0x11d46 },
+	{ 0x11d60, 0x11d65 },
+	{ 0x11d67, 0x11d68 },
+	{ 0x11d6a, 0x11d89 },
+	{ 0x11d98, 0x11d98 },
+	{ 0x11ee0, 0x11ef2 },
+	{ 0x11fb0, 0x11fb0 },
+	{ 0x12000, 0x12399 },
+	{ 0x12400, 0x1246e },
+	{ 0x12480, 0x12543 },
+	{ 0x12f90, 0x12ff0 },
+	{ 0x13000, 0x1342e },
+	{ 0x14400, 0x14646 },
+	{ 0x16800, 0x16a38 },
+	{ 0x16a40, 0x16a5e },
+	{ 0x16a70, 0x16abe },
+	{ 0x16ad0, 0x16aed },
+	{ 0x16b00, 0x16b2f },
+	{ 0x16b40, 0x16b43 },
+	{ 0x16b63, 0x16b77 },
+	{ 0x16b7d, 0x16b8f },
+	{ 0x16e40, 0x16e7f },
+	{ 0x16f00, 0x16f4a },
+	{ 0x16f50, 0x16f50 },
+	{ 0x16f93, 0x16f9f },
+	{ 0x16fe0, 0x16fe1 },
+	{ 0x16fe3, 0x16fe3 },
+	{ 0x17000, 0x187f7 },
+	{ 0x18800, 0x18cd5 },
+	{ 0x18d00, 0x18d08 },
+	{ 0x1aff0, 0x1aff3 },
+	{ 0x1aff5, 0x1affb },
+	{ 0x1affd, 0x1affe },
+	{ 0x1b000, 0x1b122 },
+	{ 0x1b150, 0x1b152 },
+	{ 0x1b164, 0x1b167 },
+	{ 0x1b170, 0x1b2fb },
+	{ 0x1bc00, 0x1bc6a },
+	{ 0x1bc70, 0x1bc7c },
+	{ 0x1bc80, 0x1bc88 },
+	{ 0x1bc90, 0x1bc99 },
+	{ 0x1d400, 0x1d454 },
+	{ 0x1d456, 0x1d49c },
+	{ 0x1d49e, 0x1d49f },
+	{ 0x1d4a2, 0x1d4a2 },
+	{ 0x1d4a5, 0x1d4a6 },
+	{ 0x1d4a9, 0x1d4ac },
+	{ 0x1d4ae, 0x1d4b9 },
+	{ 0x1d4bb, 0x1d4bb },
+	{ 0x1d4bd, 0x1d4c3 },
+	{ 0x1d4c5, 0x1d505 },
+	{ 0x1d507, 0x1d50a },
+	{ 0x1d50d, 0x1d514 },
+	{ 0x1d516, 0x1d51c },
+	{ 0x1d51e, 0x1d539 },
+	{ 0x1d53b, 0x1d53e },
+	{ 0x1d540, 0x1d544 },
+	{ 0x1d546, 0x1d546 },
+	{ 0x1d54a, 0x1d550 },
+	{ 0x1d552, 0x1d6a5 },
+	{ 0x1d6a8, 0x1d6c0 },
+	{ 0x1d6c2, 0x1d6da },
+	{ 0x1d6dc, 0x1d6fa },
+	{ 0x1d6fc, 0x1d714 },
+	{ 0x1d716, 0x1d734 },
+	{ 0x1d736, 0x1d74e },
+	{ 0x1d750, 0x1d76e },
+	{ 0x1d770, 0x1d788 },
+	{ 0x1d78a, 0x1d7a8 },
+	{ 0x1d7aa, 0x1d7c2 },
+	{ 0x1d7c4, 0x1d7cb },
+	{ 0x1df00, 0x1df1e },
+	{ 0x1e100, 0x1e12c },
+	{ 0x1e137, 0x1e13d },
+	{ 0x1e14e, 0x1e14e },
+	{ 0x1e290, 0x1e2ad },
+	{ 0x1e2c0, 0x1e2eb },
+	{ 0x1e7e0, 0x1e7e6 },
+	{ 0x1e7e8, 0x1e7eb },
+	{ 0x1e7ed, 0x1e7ee },
+	{ 0x1e7f0, 0x1e7fe },
+	{ 0x1e800, 0x1e8c4 },
+	{ 0x1e900, 0x1e943 },
+	{ 0x1e94b, 0x1e94b },
+	{ 0x1ee00, 0x1ee03 },
+	{ 0x1ee05, 0x1ee1f },
+	{ 0x1ee21, 0x1ee22 },
+	{ 0x1ee24, 0x1ee24 },
+	{ 0x1ee27, 0x1ee27 },
+	{ 0x1ee29, 0x1ee32 },
+	{ 0x1ee34, 0x1ee37 },
+	{ 0x1ee39, 0x1ee39 },
+	{ 0x1ee3b, 0x1ee3b },
+	{ 0x1ee42, 0x1ee42 },
+	{ 0x1ee47, 0x1ee47 },
+	{ 0x1ee49, 0x1ee49 },
+	{ 0x1ee4b, 0x1ee4b },
+	{ 0x1ee4d, 0x1ee4f },
+	{ 0x1ee51, 0x1ee52 },
+	{ 0x1ee54, 0x1ee54 },
+	{ 0x1ee57, 0x1ee57 },
+	{ 0x1ee59, 0x1ee59 },
+	{ 0x1ee5b, 0x1ee5b },
+	{ 0x1ee5d, 0x1ee5d },
+	{ 0x1ee5f, 0x1ee5f },
+	{ 0x1ee61, 0x1ee62 },
+	{ 0x1ee64, 0x1ee64 },
+	{ 0x1ee67, 0x1ee6a },
+	{ 0x1ee6c, 0x1ee72 },
+	{ 0x1ee74, 0x1ee77 },
+	{ 0x1ee79, 0x1ee7c },
+	{ 0x1ee7e, 0x1ee7e },
+	{ 0x1ee80, 0x1ee89 },
+	{ 0x1ee8b, 0x1ee9b },
+	{ 0x1eea1, 0x1eea3 },
+	{ 0x1eea5, 0x1eea9 },
+	{ 0x1eeab, 0x1eebb },
+	{ 0x20000, 0x2a6df },
+	{ 0x2a700, 0x2b738 },
+	{ 0x2b740, 0x2b81d },
+	{ 0x2b820, 0x2cea1 },
+	{ 0x2ceb0, 0x2ebe0 },
+	{ 0x2f800, 0x2fa1d },
+	{ 0x30000, 0x3134a },
+	{ 0x0, 0x0 },
+};
+
+static CharRange xid_continue[] = {
+	{ 0x30, 0x39 },
+	{ 0x41, 0x5a },
+	{ 0x5f, 0x5f },
+	{ 0x61, 0x7a },
+	{ 0xaa, 0xaa },
+	{ 0xb5, 0xb5 },
+	{ 0xb7, 0xb7 },
+	{ 0xba, 0xba },
+	{ 0xc0, 0xd6 },
+	{ 0xd8, 0xf6 },
+	{ 0xf8, 0x2c1 },
+	{ 0x2c6, 0x2d1 },
+	{ 0x2e0, 0x2e4 },
+	{ 0x2ec, 0x2ec },
+	{ 0x2ee, 0x2ee },
+	{ 0x300, 0x374 },
+	{ 0x376, 0x377 },
+	{ 0x37a, 0x37d },
+	{ 0x37f, 0x37f },
+	{ 0x386, 0x38a },
+	{ 0x38c, 0x38c },
+	{ 0x38e, 0x3a1 },
+	{ 0x3a3, 0x3f5 },
+	{ 0x3f7, 0x481 },
+	{ 0x483, 0x487 },
+	{ 0x48a, 0x52f },
+	{ 0x531, 0x556 },
+	{ 0x559, 0x559 },
+	{ 0x560, 0x588 },
+	{ 0x591, 0x5bd },
+	{ 0x5bf, 0x5bf },
+	{ 0x5c1, 0x5c2 },
+	{ 0x5c4, 0x5c5 },
+	{ 0x5c7, 0x5c7 },
+	{ 0x5d0, 0x5ea },
+	{ 0x5ef, 0x5f2 },
+	{ 0x610, 0x61a },
+	{ 0x620, 0x669 },
+	{ 0x66e, 0x6d3 },
+	{ 0x6d5, 0x6dc },
+	{ 0x6df, 0x6e8 },
+	{ 0x6ea, 0x6fc },
+	{ 0x6ff, 0x6ff },
+	{ 0x710, 0x74a },
+	{ 0x74d, 0x7b1 },
+	{ 0x7c0, 0x7f5 },
+	{ 0x7fa, 0x7fa },
+	{ 0x7fd, 0x7fd },
+	{ 0x800, 0x82d },
+	{ 0x840, 0x85b },
+	{ 0x860, 0x86a },
+	{ 0x870, 0x887 },
+	{ 0x889, 0x88e },
+	{ 0x898, 0x8e1 },
+	{ 0x8e3, 0x963 },
+	{ 0x966, 0x96f },
+	{ 0x971, 0x983 },
+	{ 0x985, 0x98c },
+	{ 0x98f, 0x990 },
+	{ 0x993, 0x9a8 },
+	{ 0x9aa, 0x9b0 },
+	{ 0x9b2, 0x9b2 },
+	{ 0x9b6, 0x9b9 },
+	{ 0x9bc, 0x9c4 },
+	{ 0x9c7, 0x9c8 },
+	{ 0x9cb, 0x9ce },
+	{ 0x9d7, 0x9d7 },
+	{ 0x9dc, 0x9dd },
+	{ 0x9df, 0x9e3 },
+	{ 0x9e6, 0x9f1 },
+	{ 0x9fc, 0x9fc },
+	{ 0x9fe, 0x9fe },
+	{ 0xa01, 0xa03 },
+	{ 0xa05, 0xa0a },
+	{ 0xa0f, 0xa10 },
+	{ 0xa13, 0xa28 },
+	{ 0xa2a, 0xa30 },
+	{ 0xa32, 0xa33 },
+	{ 0xa35, 0xa36 },
+	{ 0xa38, 0xa39 },
+	{ 0xa3c, 0xa3c },
+	{ 0xa3e, 0xa42 },
+	{ 0xa47, 0xa48 },
+	{ 0xa4b, 0xa4d },
+	{ 0xa51, 0xa51 },
+	{ 0xa59, 0xa5c },
+	{ 0xa5e, 0xa5e },
+	{ 0xa66, 0xa75 },
+	{ 0xa81, 0xa83 },
+	{ 0xa85, 0xa8d },
+	{ 0xa8f, 0xa91 },
+	{ 0xa93, 0xaa8 },
+	{ 0xaaa, 0xab0 },
+	{ 0xab2, 0xab3 },
+	{ 0xab5, 0xab9 },
+	{ 0xabc, 0xac5 },
+	{ 0xac7, 0xac9 },
+	{ 0xacb, 0xacd },
+	{ 0xad0, 0xad0 },
+	{ 0xae0, 0xae3 },
+	{ 0xae6, 0xaef },
+	{ 0xaf9, 0xaff },
+	{ 0xb01, 0xb03 },
+	{ 0xb05, 0xb0c },
+	{ 0xb0f, 0xb10 },
+	{ 0xb13, 0xb28 },
+	{ 0xb2a, 0xb30 },
+	{ 0xb32, 0xb33 },
+	{ 0xb35, 0xb39 },
+	{ 0xb3c, 0xb44 },
+	{ 0xb47, 0xb48 },
+	{ 0xb4b, 0xb4d },
+	{ 0xb55, 0xb57 },
+	{ 0xb5c, 0xb5d },
+	{ 0xb5f, 0xb63 },
+	{ 0xb66, 0xb6f },
+	{ 0xb71, 0xb71 },
+	{ 0xb82, 0xb83 },
+	{ 0xb85, 0xb8a },
+	{ 0xb8e, 0xb90 },
+	{ 0xb92, 0xb95 },
+	{ 0xb99, 0xb9a },
+	{ 0xb9c, 0xb9c },
+	{ 0xb9e, 0xb9f },
+	{ 0xba3, 0xba4 },
+	{ 0xba8, 0xbaa },
+	{ 0xbae, 0xbb9 },
+	{ 0xbbe, 0xbc2 },
+	{ 0xbc6, 0xbc8 },
+	{ 0xbca, 0xbcd },
+	{ 0xbd0, 0xbd0 },
+	{ 0xbd7, 0xbd7 },
+	{ 0xbe6, 0xbef },
+	{ 0xc00, 0xc0c },
+	{ 0xc0e, 0xc10 },
+	{ 0xc12, 0xc28 },
+	{ 0xc2a, 0xc39 },
+	{ 0xc3c, 0xc44 },
+	{ 0xc46, 0xc48 },
+	{ 0xc4a, 0xc4d },
+	{ 0xc55, 0xc56 },
+	{ 0xc58, 0xc5a },
+	{ 0xc5d, 0xc5d },
+	{ 0xc60, 0xc63 },
+	{ 0xc66, 0xc6f },
+	{ 0xc80, 0xc83 },
+	{ 0xc85, 0xc8c },
+	{ 0xc8e, 0xc90 },
+	{ 0xc92, 0xca8 },
+	{ 0xcaa, 0xcb3 },
+	{ 0xcb5, 0xcb9 },
+	{ 0xcbc, 0xcc4 },
+	{ 0xcc6, 0xcc8 },
+	{ 0xcca, 0xccd },
+	{ 0xcd5, 0xcd6 },
+	{ 0xcdd, 0xcde },
+	{ 0xce0, 0xce3 },
+	{ 0xce6, 0xcef },
+	{ 0xcf1, 0xcf2 },
+	{ 0xd00, 0xd0c },
+	{ 0xd0e, 0xd10 },
+	{ 0xd12, 0xd44 },
+	{ 0xd46, 0xd48 },
+	{ 0xd4a, 0xd4e },
+	{ 0xd54, 0xd57 },
+	{ 0xd5f, 0xd63 },
+	{ 0xd66, 0xd6f },
+	{ 0xd7a, 0xd7f },
+	{ 0xd81, 0xd83 },
+	{ 0xd85, 0xd96 },
+	{ 0xd9a, 0xdb1 },
+	{ 0xdb3, 0xdbb },
+	{ 0xdbd, 0xdbd },
+	{ 0xdc0, 0xdc6 },
+	{ 0xdca, 0xdca },
+	{ 0xdcf, 0xdd4 },
+	{ 0xdd6, 0xdd6 },
+	{ 0xdd8, 0xddf },
+	{ 0xde6, 0xdef },
+	{ 0xdf2, 0xdf3 },
+	{ 0xe01, 0xe3a },
+	{ 0xe40, 0xe4e },
+	{ 0xe50, 0xe59 },
+	{ 0xe81, 0xe82 },
+	{ 0xe84, 0xe84 },
+	{ 0xe86, 0xe8a },
+	{ 0xe8c, 0xea3 },
+	{ 0xea5, 0xea5 },
+	{ 0xea7, 0xebd },
+	{ 0xec0, 0xec4 },
+	{ 0xec6, 0xec6 },
+	{ 0xec8, 0xecd },
+	{ 0xed0, 0xed9 },
+	{ 0xedc, 0xedf },
+	{ 0xf00, 0xf00 },
+	{ 0xf18, 0xf19 },
+	{ 0xf20, 0xf29 },
+	{ 0xf35, 0xf35 },
+	{ 0xf37, 0xf37 },
+	{ 0xf39, 0xf39 },
+	{ 0xf3e, 0xf47 },
+	{ 0xf49, 0xf6c },
+	{ 0xf71, 0xf84 },
+	{ 0xf86, 0xf97 },
+	{ 0xf99, 0xfbc },
+	{ 0xfc6, 0xfc6 },
+	{ 0x1000, 0x1049 },
+	{ 0x1050, 0x109d },
+	{ 0x10a0, 0x10c5 },
+	{ 0x10c7, 0x10c7 },
+	{ 0x10cd, 0x10cd },
+	{ 0x10d0, 0x10fa },
+	{ 0x10fc, 0x1248 },
+	{ 0x124a, 0x124d },
+	{ 0x1250, 0x1256 },
+	{ 0x1258, 0x1258 },
+	{ 0x125a, 0x125d },
+	{ 0x1260, 0x1288 },
+	{ 0x128a, 0x128d },
+	{ 0x1290, 0x12b0 },
+	{ 0x12b2, 0x12b5 },
+	{ 0x12b8, 0x12be },
+	{ 0x12c0, 0x12c0 },
+	{ 0x12c2, 0x12c5 },
+	{ 0x12c8, 0x12d6 },
+	{ 0x12d8, 0x1310 },
+	{ 0x1312, 0x1315 },
+	{ 0x1318, 0x135a },
+	{ 0x135d, 0x135f },
+	{ 0x1369, 0x1369 },
+	{ 0x1371, 0x1371 },
+	{ 0x1380, 0x138f },
+	{ 0x13a0, 0x13f5 },
+	{ 0x13f8, 0x13fd },
+	{ 0x1401, 0x166c },
+	{ 0x166f, 0x167f },
+	{ 0x1681, 0x169a },
+	{ 0x16a0, 0x16ea },
+	{ 0x16ee, 0x16f8 },
+	{ 0x1700, 0x1715 },
+	{ 0x171f, 0x1734 },
+	{ 0x1740, 0x1753 },
+	{ 0x1760, 0x176c },
+	{ 0x176e, 0x1770 },
+	{ 0x1772, 0x1773 },
+	{ 0x1780, 0x17d3 },
+	{ 0x17d7, 0x17d7 },
+	{ 0x17dc, 0x17dd },
+	{ 0x17e0, 0x17e9 },
+	{ 0x180b, 0x180d },
+	{ 0x180f, 0x1819 },
+	{ 0x1820, 0x1878 },
+	{ 0x1880, 0x18aa },
+	{ 0x18b0, 0x18f5 },
+	{ 0x1900, 0x191e },
+	{ 0x1920, 0x192b },
+	{ 0x1930, 0x193b },
+	{ 0x1946, 0x196d },
+	{ 0x1970, 0x1974 },
+	{ 0x1980, 0x19ab },
+	{ 0x19b0, 0x19c9 },
+	{ 0x19d0, 0x19da },
+	{ 0x1a00, 0x1a1b },
+	{ 0x1a20, 0x1a5e },
+	{ 0x1a60, 0x1a7c },
+	{ 0x1a7f, 0x1a89 },
+	{ 0x1a90, 0x1a99 },
+	{ 0x1aa7, 0x1aa7 },
+	{ 0x1ab0, 0x1abd },
+	{ 0x1abf, 0x1ace },
+	{ 0x1b00, 0x1b4c },
+	{ 0x1b50, 0x1b59 },
+	{ 0x1b6b, 0x1b73 },
+	{ 0x1b80, 0x1bf3 },
+	{ 0x1c00, 0x1c37 },
+	{ 0x1c40, 0x1c49 },
+	{ 0x1c4d, 0x1c7d },
+	{ 0x1c80, 0x1c88 },
+	{ 0x1c90, 0x1cba },
+	{ 0x1cbd, 0x1cbf },
+	{ 0x1cd0, 0x1cd2 },
+	{ 0x1cd4, 0x1cfa },
+	{ 0x1d00, 0x1f15 },
+	{ 0x1f18, 0x1f1d },
+	{ 0x1f20, 0x1f45 },
+	{ 0x1f48, 0x1f4d },
+	{ 0x1f50, 0x1f57 },
+	{ 0x1f59, 0x1f59 },
+	{ 0x1f5b, 0x1f5b },
+	{ 0x1f5d, 0x1f5d },
+	{ 0x1f5f, 0x1f7d },
+	{ 0x1f80, 0x1fb4 },
+	{ 0x1fb6, 0x1fbc },
+	{ 0x1fbe, 0x1fbe },
+	{ 0x1fc2, 0x1fc4 },
+	{ 0x1fc6, 0x1fcc },
+	{ 0x1fd0, 0x1fd3 },
+	{ 0x1fd6, 0x1fdb },
+	{ 0x1fe0, 0x1fec },
+	{ 0x1ff2, 0x1ff4 },
+	{ 0x1ff6, 0x1ffc },
+	{ 0x203f, 0x2040 },
+	{ 0x2054, 0x2054 },
+	{ 0x2071, 0x2071 },
+	{ 0x207f, 0x207f },
+	{ 0x2090, 0x209c },
+	{ 0x20d0, 0x20dc },
+	{ 0x20e1, 0x20e1 },
+	{ 0x20e5, 0x20f0 },
+	{ 0x2102, 0x2102 },
+	{ 0x2107, 0x2107 },
+	{ 0x210a, 0x2113 },
+	{ 0x2115, 0x2115 },
+	{ 0x2118, 0x211d },
+	{ 0x2124, 0x2124 },
+	{ 0x2126, 0x2126 },
+	{ 0x2128, 0x2128 },
+	{ 0x212a, 0x2139 },
+	{ 0x213c, 0x213f },
+	{ 0x2145, 0x2149 },
+	{ 0x214e, 0x214e },
+	{ 0x2160, 0x2188 },
+	{ 0x2c00, 0x2ce4 },
+	{ 0x2ceb, 0x2cf3 },
+	{ 0x2d00, 0x2d25 },
+	{ 0x2d27, 0x2d27 },
+	{ 0x2d2d, 0x2d2d },
+	{ 0x2d30, 0x2d67 },
+	{ 0x2d6f, 0x2d6f },
+	{ 0x2d7f, 0x2d96 },
+	{ 0x2da0, 0x2da6 },
+	{ 0x2da8, 0x2dae },
+	{ 0x2db0, 0x2db6 },
+	{ 0x2db8, 0x2dbe },
+	{ 0x2dc0, 0x2dc6 },
+	{ 0x2dc8, 0x2dce },
+	{ 0x2dd0, 0x2dd6 },
+	{ 0x2dd8, 0x2dde },
+	{ 0x2de0, 0x2dff },
+	{ 0x3005, 0x3007 },
+	{ 0x3021, 0x302f },
+	{ 0x3031, 0x3035 },
+	{ 0x3038, 0x303c },
+	{ 0x3041, 0x3096 },
+	{ 0x3099, 0x309f },
+	{ 0x30a1, 0x30fa },
+	{ 0x30fc, 0x30ff },
+	{ 0x3105, 0x312f },
+	{ 0x3131, 0x318e },
+	{ 0x31a0, 0x31bf },
+	{ 0x31f0, 0x31ff },
+	{ 0x3400, 0x4dbf },
+	{ 0x4e00, 0xa48c },
+	{ 0xa4d0, 0xa4fd },
+	{ 0xa500, 0xa60c },
+	{ 0xa610, 0xa62b },
+	{ 0xa640, 0xa66f },
+	{ 0xa674, 0xa67d },
+	{ 0xa67f, 0xa6f1 },
+	{ 0xa717, 0xa71f },
+	{ 0xa722, 0xa788 },
+	{ 0xa78b, 0xa7ca },
+	{ 0xa7d0, 0xa7d1 },
+	{ 0xa7d3, 0xa7d3 },
+	{ 0xa7d5, 0xa7d9 },
+	{ 0xa7f2, 0xa827 },
+	{ 0xa82c, 0xa82c },
+	{ 0xa840, 0xa873 },
+	{ 0xa880, 0xa8c5 },
+	{ 0xa8d0, 0xa8d9 },
+	{ 0xa8e0, 0xa8f7 },
+	{ 0xa8fb, 0xa8fb },
+	{ 0xa8fd, 0xa92d },
+	{ 0xa930, 0xa953 },
+	{ 0xa960, 0xa97c },
+	{ 0xa980, 0xa9c0 },
+	{ 0xa9cf, 0xa9d9 },
+	{ 0xa9e0, 0xa9fe },
+	{ 0xaa00, 0xaa36 },
+	{ 0xaa40, 0xaa4d },
+	{ 0xaa50, 0xaa59 },
+	{ 0xaa60, 0xaa76 },
+	{ 0xaa7a, 0xaac2 },
+	{ 0xaadb, 0xaadd },
+	{ 0xaae0, 0xaaef },
+	{ 0xaaf2, 0xaaf6 },
+	{ 0xab01, 0xab06 },
+	{ 0xab09, 0xab0e },
+	{ 0xab11, 0xab16 },
+	{ 0xab20, 0xab26 },
+	{ 0xab28, 0xab2e },
+	{ 0xab30, 0xab5a },
+	{ 0xab5c, 0xab69 },
+	{ 0xab70, 0xabea },
+	{ 0xabec, 0xabed },
+	{ 0xabf0, 0xabf9 },
+	{ 0xac00, 0xd7a3 },
+	{ 0xd7b0, 0xd7c6 },
+	{ 0xd7cb, 0xd7fb },
+	{ 0xf900, 0xfa6d },
+	{ 0xfa70, 0xfad9 },
+	{ 0xfb00, 0xfb06 },
+	{ 0xfb13, 0xfb17 },
+	{ 0xfb1d, 0xfb28 },
+	{ 0xfb2a, 0xfb36 },
+	{ 0xfb38, 0xfb3c },
+	{ 0xfb3e, 0xfb3e },
+	{ 0xfb40, 0xfb41 },
+	{ 0xfb43, 0xfb44 },
+	{ 0xfb46, 0xfbb1 },
+	{ 0xfbd3, 0xfd3d },
+	{ 0xfd50, 0xfd8f },
+	{ 0xfd92, 0xfdc7 },
+	{ 0xfdf0, 0xfdfb },
+	{ 0xfe00, 0xfe0f },
+	{ 0xfe20, 0xfe2f },
+	{ 0xfe33, 0xfe34 },
+	{ 0xfe4d, 0xfe4f },
+	{ 0xfe70, 0xfe74 },
+	{ 0xfe76, 0xfefc },
+	{ 0xff10, 0xff19 },
+	{ 0xff21, 0xff3a },
+	{ 0xff3f, 0xff3f },
+	{ 0xff41, 0xff5a },
+	{ 0xff66, 0xffbe },
+	{ 0xffc2, 0xffc7 },
+	{ 0xffca, 0xffcf },
+	{ 0xffd2, 0xffd7 },
+	{ 0xffda, 0xffdc },
+	{ 0x10000, 0x1000b },
+	{ 0x1000d, 0x10026 },
+	{ 0x10028, 0x1003a },
+	{ 0x1003c, 0x1003d },
+	{ 0x1003f, 0x1004d },
+	{ 0x10050, 0x1005d },
+	{ 0x10080, 0x100fa },
+	{ 0x10140, 0x10174 },
+	{ 0x101fd, 0x101fd },
+	{ 0x10280, 0x1029c },
+	{ 0x102a0, 0x102d0 },
+	{ 0x102e0, 0x102e0 },
+	{ 0x10300, 0x1031f },
+	{ 0x1032d, 0x1034a },
+	{ 0x10350, 0x1037a },
+	{ 0x10380, 0x1039d },
+	{ 0x103a0, 0x103c3 },
+	{ 0x103c8, 0x103cf },
+	{ 0x103d1, 0x103d5 },
+	{ 0x10400, 0x1049d },
+	{ 0x104a0, 0x104a9 },
+	{ 0x104b0, 0x104d3 },
+	{ 0x104d8, 0x104fb },
+	{ 0x10500, 0x10527 },
+	{ 0x10530, 0x10563 },
+	{ 0x10570, 0x1057a },
+	{ 0x1057c, 0x1058a },
+	{ 0x1058c, 0x10592 },
+	{ 0x10594, 0x10595 },
+	{ 0x10597, 0x105a1 },
+	{ 0x105a3, 0x105b1 },
+	{ 0x105b3, 0x105b9 },
+	{ 0x105bb, 0x105bc },
+	{ 0x10600, 0x10736 },
+	{ 0x10740, 0x10755 },
+	{ 0x10760, 0x10767 },
+	{ 0x10780, 0x10785 },
+	{ 0x10787, 0x107b0 },
+	{ 0x107b2, 0x107ba },
+	{ 0x10800, 0x10805 },
+	{ 0x10808, 0x10808 },
+	{ 0x1080a, 0x10835 },
+	{ 0x10837, 0x10838 },
+	{ 0x1083c, 0x1083c },
+	{ 0x1083f, 0x10855 },
+	{ 0x10860, 0x10876 },
+	{ 0x10880, 0x1089e },
+	{ 0x108e0, 0x108f2 },
+	{ 0x108f4, 0x108f5 },
+	{ 0x10900, 0x10915 },
+	{ 0x10920, 0x10939 },
+	{ 0x10980, 0x109b7 },
+	{ 0x109be, 0x109bf },
+	{ 0x10a00, 0x10a03 },
+	{ 0x10a05, 0x10a06 },
+	{ 0x10a0c, 0x10a13 },
+	{ 0x10a15, 0x10a17 },
+	{ 0x10a19, 0x10a35 },
+	{ 0x10a38, 0x10a3a },
+	{ 0x10a3f, 0x10a3f },
+	{ 0x10a60, 0x10a7c },
+	{ 0x10a80, 0x10a9c },
+	{ 0x10ac0, 0x10ac7 },
+	{ 0x10ac9, 0x10ae6 },
+	{ 0x10b00, 0x10b35 },
+	{ 0x10b40, 0x10b55 },
+	{ 0x10b60, 0x10b72 },
+	{ 0x10b80, 0x10b91 },
+	{ 0x10c00, 0x10c48 },
+	{ 0x10c80, 0x10cb2 },
+	{ 0x10cc0, 0x10cf2 },
+	{ 0x10d00, 0x10d27 },
+	{ 0x10d30, 0x10d39 },
+	{ 0x10e80, 0x10ea9 },
+	{ 0x10eab, 0x10eac },
+	{ 0x10eb0, 0x10eb1 },
+	{ 0x10f00, 0x10f1c },
+	{ 0x10f27, 0x10f27 },
+	{ 0x10f30, 0x10f50 },
+	{ 0x10f70, 0x10f85 },
+	{ 0x10fb0, 0x10fc4 },
+	{ 0x10fe0, 0x10ff6 },
+	{ 0x11000, 0x11046 },
+	{ 0x11066, 0x11075 },
+	{ 0x1107f, 0x110ba },
+	{ 0x110c2, 0x110c2 },
+	{ 0x110d0, 0x110e8 },
+	{ 0x110f0, 0x110f9 },
+	{ 0x11100, 0x11134 },
+	{ 0x11136, 0x1113f },
+	{ 0x11144, 0x11147 },
+	{ 0x11150, 0x11173 },
+	{ 0x11176, 0x11176 },
+	{ 0x11180, 0x111c4 },
+	{ 0x111c9, 0x111cc },
+	{ 0x111ce, 0x111da },
+	{ 0x111dc, 0x111dc },
+	{ 0x11200, 0x11211 },
+	{ 0x11213, 0x11237 },
+	{ 0x1123e, 0x1123e },
+	{ 0x11280, 0x11286 },
+	{ 0x11288, 0x11288 },
+	{ 0x1128a, 0x1128d },
+	{ 0x1128f, 0x1129d },
+	{ 0x1129f, 0x112a8 },
+	{ 0x112b0, 0x112ea },
+	{ 0x112f0, 0x112f9 },
+	{ 0x11300, 0x11303 },
+	{ 0x11305, 0x1130c },
+	{ 0x1130f, 0x11310 },
+	{ 0x11313, 0x11328 },
+	{ 0x1132a, 0x11330 },
+	{ 0x11332, 0x11333 },
+	{ 0x11335, 0x11339 },
+	{ 0x1133b, 0x11344 },
+	{ 0x11347, 0x11348 },
+	{ 0x1134b, 0x1134d },
+	{ 0x11350, 0x11350 },
+	{ 0x11357, 0x11357 },
+	{ 0x1135d, 0x11363 },
+	{ 0x11366, 0x1136c },
+	{ 0x11370, 0x11374 },
+	{ 0x11400, 0x1144a },
+	{ 0x11450, 0x11459 },
+	{ 0x1145e, 0x11461 },
+	{ 0x11480, 0x114c5 },
+	{ 0x114c7, 0x114c7 },
+	{ 0x114d0, 0x114d9 },
+	{ 0x11580, 0x115b5 },
+	{ 0x115b8, 0x115c0 },
+	{ 0x115d8, 0x115dd },
+	{ 0x11600, 0x11640 },
+	{ 0x11644, 0x11644 },
+	{ 0x11650, 0x11659 },
+	{ 0x11680, 0x116b8 },
+	{ 0x116c0, 0x116c9 },
+	{ 0x11700, 0x1171a },
+	{ 0x1171d, 0x1172b },
+	{ 0x11730, 0x11739 },
+	{ 0x11740, 0x11746 },
+	{ 0x11800, 0x1183a },
+	{ 0x118a0, 0x118e9 },
+	{ 0x118ff, 0x11906 },
+	{ 0x11909, 0x11909 },
+	{ 0x1190c, 0x11913 },
+	{ 0x11915, 0x11916 },
+	{ 0x11918, 0x11935 },
+	{ 0x11937, 0x11938 },
+	{ 0x1193b, 0x11943 },
+	{ 0x11950, 0x11959 },
+	{ 0x119a0, 0x119a7 },
+	{ 0x119aa, 0x119d7 },
+	{ 0x119da, 0x119e1 },
+	{ 0x119e3, 0x119e4 },
+	{ 0x11a00, 0x11a3e },
+	{ 0x11a47, 0x11a47 },
+	{ 0x11a50, 0x11a99 },
+	{ 0x11a9d, 0x11a9d },
+	{ 0x11ab0, 0x11af8 },
+	{ 0x11c00, 0x11c08 },
+	{ 0x11c0a, 0x11c36 },
+	{ 0x11c38, 0x11c40 },
+	{ 0x11c50, 0x11c59 },
+	{ 0x11c72, 0x11c8f },
+	{ 0x11c92, 0x11ca7 },
+	{ 0x11ca9, 0x11cb6 },
+	{ 0x11d00, 0x11d06 },
+	{ 0x11d08, 0x11d09 },
+	{ 0x11d0b, 0x11d36 },
+	{ 0x11d3a, 0x11d3a },
+	{ 0x11d3c, 0x11d3d },
+	{ 0x11d3f, 0x11d47 },
+	{ 0x11d50, 0x11d59 },
+	{ 0x11d60, 0x11d65 },
+	{ 0x11d67, 0x11d68 },
+	{ 0x11d6a, 0x11d8e },
+	{ 0x11d90, 0x11d91 },
+	{ 0x11d93, 0x11d98 },
+	{ 0x11da0, 0x11da9 },
+	{ 0x11ee0, 0x11ef6 },
+	{ 0x11fb0, 0x11fb0 },
+	{ 0x12000, 0x12399 },
+	{ 0x12400, 0x1246e },
+	{ 0x12480, 0x12543 },
+	{ 0x12f90, 0x12ff0 },
+	{ 0x13000, 0x1342e },
+	{ 0x14400, 0x14646 },
+	{ 0x16800, 0x16a38 },
+	{ 0x16a40, 0x16a5e },
+	{ 0x16a60, 0x16a69 },
+	{ 0x16a70, 0x16abe },
+	{ 0x16ac0, 0x16ac9 },
+	{ 0x16ad0, 0x16aed },
+	{ 0x16af0, 0x16af4 },
+	{ 0x16b00, 0x16b36 },
+	{ 0x16b40, 0x16b43 },
+	{ 0x16b50, 0x16b59 },
+	{ 0x16b63, 0x16b77 },
+	{ 0x16b7d, 0x16b8f },
+	{ 0x16e40, 0x16e7f },
+	{ 0x16f00, 0x16f4a },
+	{ 0x16f4f, 0x16f87 },
+	{ 0x16f8f, 0x16f9f },
+	{ 0x16fe0, 0x16fe1 },
+	{ 0x16fe3, 0x16fe4 },
+	{ 0x16ff0, 0x16ff1 },
+	{ 0x17000, 0x187f7 },
+	{ 0x18800, 0x18cd5 },
+	{ 0x18d00, 0x18d08 },
+	{ 0x1aff0, 0x1aff3 },
+	{ 0x1aff5, 0x1affb },
+	{ 0x1affd, 0x1affe },
+	{ 0x1b000, 0x1b122 },
+	{ 0x1b150, 0x1b152 },
+	{ 0x1b164, 0x1b167 },
+	{ 0x1b170, 0x1b2fb },
+	{ 0x1bc00, 0x1bc6a },
+	{ 0x1bc70, 0x1bc7c },
+	{ 0x1bc80, 0x1bc88 },
+	{ 0x1bc90, 0x1bc99 },
+	{ 0x1bc9d, 0x1bc9e },
+	{ 0x1cf00, 0x1cf2d },
+	{ 0x1cf30, 0x1cf46 },
+	{ 0x1d165, 0x1d169 },
+	{ 0x1d16d, 0x1d172 },
+	{ 0x1d17b, 0x1d182 },
+	{ 0x1d185, 0x1d18b },
+	{ 0x1d1aa, 0x1d1ad },
+	{ 0x1d242, 0x1d244 },
+	{ 0x1d400, 0x1d454 },
+	{ 0x1d456, 0x1d49c },
+	{ 0x1d49e, 0x1d49f },
+	{ 0x1d4a2, 0x1d4a2 },
+	{ 0x1d4a5, 0x1d4a6 },
+	{ 0x1d4a9, 0x1d4ac },
+	{ 0x1d4ae, 0x1d4b9 },
+	{ 0x1d4bb, 0x1d4bb },
+	{ 0x1d4bd, 0x1d4c3 },
+	{ 0x1d4c5, 0x1d505 },
+	{ 0x1d507, 0x1d50a },
+	{ 0x1d50d, 0x1d514 },
+	{ 0x1d516, 0x1d51c },
+	{ 0x1d51e, 0x1d539 },
+	{ 0x1d53b, 0x1d53e },
+	{ 0x1d540, 0x1d544 },
+	{ 0x1d546, 0x1d546 },
+	{ 0x1d54a, 0x1d550 },
+	{ 0x1d552, 0x1d6a5 },
+	{ 0x1d6a8, 0x1d6c0 },
+	{ 0x1d6c2, 0x1d6da },
+	{ 0x1d6dc, 0x1d6fa },
+	{ 0x1d6fc, 0x1d714 },
+	{ 0x1d716, 0x1d734 },
+	{ 0x1d736, 0x1d74e },
+	{ 0x1d750, 0x1d76e },
+	{ 0x1d770, 0x1d788 },
+	{ 0x1d78a, 0x1d7a8 },
+	{ 0x1d7aa, 0x1d7c2 },
+	{ 0x1d7c4, 0x1d7cb },
+	{ 0x1d7ce, 0x1d7ff },
+	{ 0x1da00, 0x1da36 },
+	{ 0x1da3b, 0x1da6c },
+	{ 0x1da75, 0x1da75 },
+	{ 0x1da84, 0x1da84 },
+	{ 0x1da9b, 0x1da9f },
+	{ 0x1daa1, 0x1daaf },
+	{ 0x1df00, 0x1df1e },
+	{ 0x1e000, 0x1e006 },
+	{ 0x1e008, 0x1e018 },
+	{ 0x1e01b, 0x1e021 },
+	{ 0x1e023, 0x1e024 },
+	{ 0x1e026, 0x1e02a },
+	{ 0x1e100, 0x1e12c },
+	{ 0x1e130, 0x1e13d },
+	{ 0x1e140, 0x1e149 },
+	{ 0x1e14e, 0x1e14e },
+	{ 0x1e290, 0x1e2ae },
+	{ 0x1e2c0, 0x1e2f9 },
+	{ 0x1e7e0, 0x1e7e6 },
+	{ 0x1e7e8, 0x1e7eb },
+	{ 0x1e7ed, 0x1e7ee },
+	{ 0x1e7f0, 0x1e7fe },
+	{ 0x1e800, 0x1e8c4 },
+	{ 0x1e8d0, 0x1e8d6 },
+	{ 0x1e900, 0x1e94b },
+	{ 0x1e950, 0x1e959 },
+	{ 0x1ee00, 0x1ee03 },
+	{ 0x1ee05, 0x1ee1f },
+	{ 0x1ee21, 0x1ee22 },
+	{ 0x1ee24, 0x1ee24 },
+	{ 0x1ee27, 0x1ee27 },
+	{ 0x1ee29, 0x1ee32 },
+	{ 0x1ee34, 0x1ee37 },
+	{ 0x1ee39, 0x1ee39 },
+	{ 0x1ee3b, 0x1ee3b },
+	{ 0x1ee42, 0x1ee42 },
+	{ 0x1ee47, 0x1ee47 },
+	{ 0x1ee49, 0x1ee49 },
+	{ 0x1ee4b, 0x1ee4b },
+	{ 0x1ee4d, 0x1ee4f },
+	{ 0x1ee51, 0x1ee52 },
+	{ 0x1ee54, 0x1ee54 },
+	{ 0x1ee57, 0x1ee57 },
+	{ 0x1ee59, 0x1ee59 },
+	{ 0x1ee5b, 0x1ee5b },
+	{ 0x1ee5d, 0x1ee5d },
+	{ 0x1ee5f, 0x1ee5f },
+	{ 0x1ee61, 0x1ee62 },
+	{ 0x1ee64, 0x1ee64 },
+	{ 0x1ee67, 0x1ee6a },
+	{ 0x1ee6c, 0x1ee72 },
+	{ 0x1ee74, 0x1ee77 },
+	{ 0x1ee79, 0x1ee7c },
+	{ 0x1ee7e, 0x1ee7e },
+	{ 0x1ee80, 0x1ee89 },
+	{ 0x1ee8b, 0x1ee9b },
+	{ 0x1eea1, 0x1eea3 },
+	{ 0x1eea5, 0x1eea9 },
+	{ 0x1eeab, 0x1eebb },
+	{ 0x1fbf0, 0x1fbf9 },
+	{ 0x20000, 0x2a6df },
+	{ 0x2a700, 0x2b738 },
+	{ 0x2b740, 0x2b81d },
+	{ 0x2b820, 0x2cea1 },
+	{ 0x2ceb0, 0x2ebe0 },
+	{ 0x2f800, 0x2fa1d },
+	{ 0x30000, 0x3134a },
+	{ 0xe0100, 0xe01ef },
+	{ 0x0, 0x0 },
+};
+
+#endif // CHAR_RANGE_INC

core/string/char_utils.h

@@ -33,6 +33,26 @@
 
 #include "core/typedefs.h"
 
+#include "char_range.inc"
+
+static _FORCE_INLINE_ bool is_unicode_identifier_start(char32_t c) {
+	for (int i = 0; xid_start[i].start != 0; i++) {
+		if (c >= xid_start[i].start && c <= xid_start[i].end) {
+			return true;
+		}
+	}
+	return false;
+}
+
+static _FORCE_INLINE_ bool is_unicode_identifier_continue(char32_t c) {
+	for (int i = 0; xid_continue[i].start != 0; i++) {
+		if (c >= xid_continue[i].start && c <= xid_continue[i].end) {
+			return true;
+		}
+	}
+	return false;
+}
+
 static _FORCE_INLINE_ bool is_ascii_upper_case(char32_t c) {
 	return (c >= 'A' && c <= 'Z');
 }

doc/classes/TextServer.xml

@@ -944,6 +944,21 @@
 				Returns [code]true[/code] if locale is right-to-left.
 			</description>
 		</method>
+		<method name="is_valid_identifier" qualifiers="const">
+			<return type="bool" />
+			<argument index="0" name="string" type="String" />
+			<description>
+				Returns [code]true[/code] is [code]string[/code] is a valid identifier.
+				If the text server supports the [constant FEATURE_UNICODE_IDENTIFIERS] feature, a valid identifier must:
+				- Conform to normalization form C.
+				- Begin with a Unicode character of class XID_Start or [code]"_"[/code].
+				- May contain Unicode characters of class XID_Continue in the other positions.
+				- Use UAX #31 recommended scripts only (mixed scripts are allowed).
+				If the [constant FEATURE_UNICODE_IDENTIFIERS] feature is not supported, a valid identifier must:
+				- Begin with a Unicode character of class XID_Start or [code]"_"[/code].
+				- May contain Unicode characters of class XID_Continue in the other positions.
+			</description>
+		</method>
 		<method name="load_support_data">
 			<return type="bool" />
 			<argument index="0" name="filename" type="String" />
@@ -1713,7 +1728,10 @@
 			TextServer supports locale dependent and context sensitive case conversion.
 		</constant>
 		<constant name="FEATURE_USE_SUPPORT_DATA" value="4096" enum="Feature">
-			TextServer require external data file for some features.
+			TextServer require external data file for some features, see [method load_support_data].
+		</constant>
+		<constant name="FEATURE_UNICODE_IDENTIFIERS" value="8192" enum="Feature">
+			TextServer supports UAX #31 identifier validation, see [method is_valid_identifier].
 		</constant>
 		<constant name="CONTOUR_CURVE_TAG_ON" value="1" enum="ContourPointTag">
 			Contour point is on the curve.

doc/classes/TextServerExtension.xml

@@ -941,6 +941,13 @@
 				Returns [code]true[/code] if locale is right-to-left.
 			</description>
 		</method>
+		<method name="is_valid_identifier" qualifiers="virtual const">
+			<return type="bool" />
+			<argument index="0" name="string" type="String" />
+			<description>
+				Returns [code]true[/code] is [code]string[/code] is a valid identifier.
+			</description>
+		</method>
 		<method name="load_support_data" qualifiers="virtual">
 			<return type="bool" />
 			<argument index="0" name="filename" type="String" />

modules/text_server_adv/text_server_adv.cpp

@@ -346,6 +346,7 @@ bool TextServerAdvanced::has_feature(Feature p_feature) const {
 		case FEATURE_FONT_VARIABLE:
 		case FEATURE_CONTEXT_SENSITIVE_CASE_CONVERSION:
 		case FEATURE_USE_SUPPORT_DATA:
+		case FEATURE_UNICODE_IDENTIFIERS:
 			return true;
 		default: {
 		}
@@ -5757,6 +5758,191 @@ PackedInt32Array TextServerAdvanced::string_get_word_breaks(const String &p_stri
 	return ret;
 }
 
+bool TextServerAdvanced::is_valid_identifier(const String &p_string) const {
+	enum UAX31SequenceStatus {
+		SEQ_NOT_STARTED,
+		SEQ_STARTED,
+		SEQ_STARTED_VIR,
+		SEQ_NEAR_END,
+	};
+
+	const char32_t *str = p_string.ptr();
+	int len = p_string.length();
+
+	if (len == 0) {
+		return false; // Empty string.
+	}
+
+	UErrorCode err = U_ZERO_ERROR;
+	Char16String utf16 = p_string.utf16();
+	const UNormalizer2 *norm_c = unorm2_getNFCInstance(&err);
+	if (U_FAILURE(err)) {
+		return false; // Failed to load normalizer.
+	}
+	bool isnurom = unorm2_isNormalized(norm_c, utf16.ptr(), utf16.length(), &err);
+	if (U_FAILURE(err) || !isnurom) {
+		return false; // Do not conform to Normalization Form C.
+	}
+
+	UAX31SequenceStatus A1_sequence_status = SEQ_NOT_STARTED;
+	UScriptCode A1_scr = USCRIPT_INHERITED;
+	UAX31SequenceStatus A2_sequence_status = SEQ_NOT_STARTED;
+	UScriptCode A2_scr = USCRIPT_INHERITED;
+	UAX31SequenceStatus B_sequence_status = SEQ_NOT_STARTED;
+	UScriptCode B_scr = USCRIPT_INHERITED;
+
+	for (int i = 0; i < len; i++) {
+		err = U_ZERO_ERROR;
+		UScriptCode scr = uscript_getScript(str[i], &err);
+		if (U_FAILURE(err)) {
+			return false; // Invalid script.
+		}
+		if (uscript_getUsage(scr) != USCRIPT_USAGE_RECOMMENDED) {
+			return false; // Not a recommended script.
+		}
+		uint8_t cat = u_charType(str[i]);
+		int32_t jt = u_getIntPropertyValue(str[i], UCHAR_JOINING_TYPE);
+
+		// UAX #31 section 2.3 subsections A1, A2 and B, check ZWNJ and ZWJ usage.
+		switch (A1_sequence_status) {
+			case SEQ_NEAR_END: {
+				if ((A1_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != A1_scr)) {
+					return false; // Mixed script.
+				}
+				if (jt == U_JT_RIGHT_JOINING || jt == U_JT_DUAL_JOINING) {
+					A1_sequence_status = SEQ_NOT_STARTED; // Valid end of sequence, reset.
+				} else if (jt != U_JT_TRANSPARENT) {
+					return false; // Invalid end of sequence.
+				}
+			} break;
+			case SEQ_STARTED: {
+				if ((A1_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != A1_scr)) {
+					A1_sequence_status = SEQ_NOT_STARTED; // Reset.
+				} else {
+					if (jt != U_JT_TRANSPARENT) {
+						if (str[i] == 0x200C /*ZWNJ*/) {
+							A1_sequence_status = SEQ_NEAR_END;
+							continue;
+						} else {
+							A1_sequence_status = SEQ_NOT_STARTED; // Reset.
+						}
+					}
+				}
+			} break;
+			default:
+				break;
+		}
+		if (A1_sequence_status == SEQ_NOT_STARTED) {
+			if (jt == U_JT_LEFT_JOINING || jt == U_JT_DUAL_JOINING) {
+				A1_sequence_status = SEQ_STARTED;
+				A1_scr = scr;
+			}
+		};
+
+		switch (A2_sequence_status) {
+			case SEQ_NEAR_END: {
+				if ((A2_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != A2_scr)) {
+					return false; // Mixed script.
+				}
+				if (cat == U_UPPERCASE_LETTER || cat == U_LOWERCASE_LETTER || cat == U_TITLECASE_LETTER || cat == U_MODIFIER_LETTER || cat == U_OTHER_LETTER) {
+					A2_sequence_status = SEQ_NOT_STARTED; // Valid end of sequence, reset.
+				} else if (cat != U_MODIFIER_LETTER || u_getCombiningClass(str[i]) == 0) {
+					return false; // Invalid end of sequence.
+				}
+			} break;
+			case SEQ_STARTED_VIR: {
+				if ((A2_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != A2_scr)) {
+					A2_sequence_status = SEQ_NOT_STARTED; // Reset.
+				} else {
+					if (str[i] == 0x200C /*ZWNJ*/) {
+						A2_sequence_status = SEQ_NEAR_END;
+						continue;
+					} else if (cat != U_MODIFIER_LETTER || u_getCombiningClass(str[i]) == 0) {
+						A2_sequence_status = SEQ_NOT_STARTED; // Reset.
+					}
+				}
+			} break;
+			case SEQ_STARTED: {
+				if ((A2_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != A2_scr)) {
+					A2_sequence_status = SEQ_NOT_STARTED; // Reset.
+				} else {
+					if (u_getCombiningClass(str[i]) == 9 /*Virama Combining Class*/) {
+						A2_sequence_status = SEQ_STARTED_VIR;
+					} else if (cat != U_MODIFIER_LETTER) {
+						A2_sequence_status = SEQ_NOT_STARTED; // Reset.
+					}
+				}
+			} break;
+			default:
+				break;
+		}
+		if (A2_sequence_status == SEQ_NOT_STARTED) {
+			if (cat == U_UPPERCASE_LETTER || cat == U_LOWERCASE_LETTER || cat == U_TITLECASE_LETTER || cat == U_MODIFIER_LETTER || cat == U_OTHER_LETTER) {
+				A2_sequence_status = SEQ_STARTED;
+				A2_scr = scr;
+			}
+		}
+
+		switch (B_sequence_status) {
+			case SEQ_NEAR_END: {
+				if ((B_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != B_scr)) {
+					return false; // Mixed script.
+				}
+				if (u_getIntPropertyValue(str[i], UCHAR_INDIC_SYLLABIC_CATEGORY) != U_INSC_VOWEL_DEPENDENT) {
+					B_sequence_status = SEQ_NOT_STARTED; // Valid end of sequence, reset.
+				} else {
+					return false; // Invalid end of sequence.
+				}
+			} break;
+			case SEQ_STARTED_VIR: {
+				if ((B_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != B_scr)) {
+					B_sequence_status = SEQ_NOT_STARTED; // Reset.
+				} else {
+					if (str[i] == 0x200D /*ZWJ*/) {
+						B_sequence_status = SEQ_NEAR_END;
+						continue;
+					} else if (cat != U_MODIFIER_LETTER || u_getCombiningClass(str[i]) == 0) {
+						B_sequence_status = SEQ_NOT_STARTED; // Reset.
+					}
+				}
+			} break;
+			case SEQ_STARTED: {
+				if ((B_scr > USCRIPT_INHERITED) && (scr > USCRIPT_INHERITED) && (scr != B_scr)) {
+					B_sequence_status = SEQ_NOT_STARTED; // Reset.
+				} else {
+					if (u_getCombiningClass(str[i]) == 9 /*Virama Combining Class*/) {
+						B_sequence_status = SEQ_STARTED_VIR;
+					} else if (cat != U_MODIFIER_LETTER) {
+						B_sequence_status = SEQ_NOT_STARTED; // Reset.
+					}
+				}
+			} break;
+			default:
+				break;
+		}
+		if (B_sequence_status == SEQ_NOT_STARTED) {
+			if (cat == U_UPPERCASE_LETTER || cat == U_LOWERCASE_LETTER || cat == U_TITLECASE_LETTER || cat == U_MODIFIER_LETTER || cat == U_OTHER_LETTER) {
+				B_sequence_status = SEQ_STARTED;
+				B_scr = scr;
+			}
+		}
+
+		if (u_hasBinaryProperty(str[i], UCHAR_PATTERN_SYNTAX) || u_hasBinaryProperty(str[i], UCHAR_PATTERN_WHITE_SPACE) || u_hasBinaryProperty(str[i], UCHAR_NONCHARACTER_CODE_POINT)) {
+			return false; // Not a XID_Start or XID_Continue character.
+		}
+		if (i == 0) {
+			if (!(cat == U_LOWERCASE_LETTER || cat == U_UPPERCASE_LETTER || cat == U_TITLECASE_LETTER || cat == U_OTHER_LETTER || cat == U_MODIFIER_LETTER || cat == U_LETTER_NUMBER || str[0] == 0x2118 || str[0] == 0x212E || str[0] == 0x309B || str[0] == 0x309C || str[0] == 0x005F)) {
+				return false; // Not a XID_Start character.
+			}
+		} else {
+			if (!(cat == U_LOWERCASE_LETTER || cat == U_UPPERCASE_LETTER || cat == U_TITLECASE_LETTER || cat == U_OTHER_LETTER || cat == U_MODIFIER_LETTER || cat == U_LETTER_NUMBER || cat == U_NON_SPACING_MARK || cat == U_COMBINING_SPACING_MARK || cat == U_DECIMAL_DIGIT_NUMBER || cat == U_CONNECTOR_PUNCTUATION || str[i] == 0x2118 || str[i] == 0x212E || str[i] == 0x309B || str[i] == 0x309C || str[i] == 0x1369 || str[i] == 0x1371 || str[i] == 0x00B7 || str[i] == 0x0387 || str[i] == 0x19DA || str[i] == 0x0E33 || str[i] == 0x0EB3 || str[i] == 0xFF9E || str[i] == 0xFF9F)) {
+				return false; // Not a XID_Continue character.
+			}
+		}
+	}
+	return true;
+}
+
 TextServerAdvanced::TextServerAdvanced() {
 	_insert_num_systems_lang();
 	_insert_feature_sets();

modules/text_server_adv/text_server_adv.h

@@ -702,6 +702,7 @@ public:
 	virtual PackedInt32Array string_get_word_breaks(const String &p_string, const String &p_language = "") const override;
 
 	virtual String strip_diacritics(const String &p_string) const override;
+	virtual bool is_valid_identifier(const String &p_string) const override;
 
 	virtual String string_to_upper(const String &p_string, const String &p_language = "") const override;
 	virtual String string_to_lower(const String &p_string, const String &p_language = "") const override;

servers/text/text_server_extension.cpp

@@ -297,6 +297,7 @@ void TextServerExtension::_bind_methods() {
 	GDVIRTUAL_BIND(percent_sign, "language");
 
 	GDVIRTUAL_BIND(strip_diacritics, "string");
+	GDVIRTUAL_BIND(is_valid_identifier, "string");
 
 	GDVIRTUAL_BIND(string_get_word_breaks, "string", "language");
 
@@ -1498,6 +1499,14 @@ String TextServerExtension::percent_sign(const String &p_language) const {
 	return "%";
 }
 
+bool TextServerExtension::is_valid_identifier(const String &p_string) const {
+	bool ret;
+	if (GDVIRTUAL_CALL(is_valid_identifier, p_string, ret)) {
+		return ret;
+	}
+	return TextServer::is_valid_identifier(p_string);
+}
+
 String TextServerExtension::strip_diacritics(const String &p_string) const {
 	String ret;
 	if (GDVIRTUAL_CALL(strip_diacritics, p_string, ret)) {

servers/text/text_server_extension.h

@@ -496,6 +496,9 @@ public:
 	virtual PackedInt32Array string_get_word_breaks(const String &p_string, const String &p_language = "") const override;
 	GDVIRTUAL2RC(PackedInt32Array, string_get_word_breaks, const String &, const String &);
 
+	virtual bool is_valid_identifier(const String &p_string) const override;
+	GDVIRTUAL1RC(bool, is_valid_identifier, const String &);
+
 	virtual String string_to_upper(const String &p_string, const String &p_language = "") const override;
 	virtual String string_to_lower(const String &p_string, const String &p_language = "") const override;
 	GDVIRTUAL2RC(String, string_to_upper, const String &, const String &);

servers/text_server.cpp

@@ -447,6 +447,7 @@ void TextServer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("string_get_word_breaks", "string", "language"), &TextServer::string_get_word_breaks, DEFVAL(""));
 
 	ClassDB::bind_method(D_METHOD("strip_diacritics", "string"), &TextServer::strip_diacritics);
+	ClassDB::bind_method(D_METHOD("is_valid_identifier", "string"), &TextServer::is_valid_identifier);
 
 	ClassDB::bind_method(D_METHOD("string_to_upper", "string", "language"), &TextServer::string_to_upper, DEFVAL(""));
 	ClassDB::bind_method(D_METHOD("string_to_lower", "string", "language"), &TextServer::string_to_lower, DEFVAL(""));
@@ -545,6 +546,7 @@ void TextServer::_bind_methods() {
 	BIND_ENUM_CONSTANT(FEATURE_FONT_VARIABLE);
 	BIND_ENUM_CONSTANT(FEATURE_CONTEXT_SENSITIVE_CASE_CONVERSION);
 	BIND_ENUM_CONSTANT(FEATURE_USE_SUPPORT_DATA);
+	BIND_ENUM_CONSTANT(FEATURE_UNICODE_IDENTIFIERS);
 
 	/* FT Contour Point Types */
 	BIND_ENUM_CONSTANT(CONTOUR_CURVE_TAG_ON);
@@ -1730,6 +1732,26 @@ Array TextServer::_shaped_text_get_ellipsis_glyphs_wrapper(const RID &p_shaped)
 	return ret;
 }
 
+bool TextServer::is_valid_identifier(const String &p_string) const {
+	const char32_t *str = p_string.ptr();
+	int len = p_string.length();
+
+	if (len == 0) {
+		return false; // Empty string.
+	}
+
+	if (!is_unicode_identifier_start(str[0])) {
+		return false;
+	}
+
+	for (int i = 1; i < len; i++) {
+		if (!is_unicode_identifier_continue(str[i])) {
+			return false;
+		}
+	}
+	return true;
+}
+
 TextServer::TextServer() {
 	_init_diacritics_map();
 }

servers/text_server.h

@@ -148,6 +148,7 @@ public:
 		FEATURE_FONT_VARIABLE = 1 << 10,
 		FEATURE_CONTEXT_SENSITIVE_CASE_CONVERSION = 1 << 11,
 		FEATURE_USE_SUPPORT_DATA = 1 << 12,
+		FEATURE_UNICODE_IDENTIFIERS = 1 << 13,
 	};
 
 	enum ContourPointTag {
@@ -464,6 +465,7 @@ public:
 	virtual PackedInt32Array string_get_word_breaks(const String &p_string, const String &p_language = "") const = 0;
 
 	virtual String strip_diacritics(const String &p_string) const;
+	virtual bool is_valid_identifier(const String &p_string) const;
 
 	// Other string operations.
 	virtual String string_to_upper(const String &p_string, const String &p_language = "") const = 0;

tests/servers/test_text_server.h

@@ -39,7 +39,7 @@
 
 namespace TestTextServer {
 
-TEST_SUITE("[[TextServer]") {
+TEST_SUITE("[TextServer]") {
 	TEST_CASE("[TextServer] Init, font loading and shaping") {
 		SUBCASE("[TextServer] Loading fonts") {
 			for (int i = 0; i < TextServerManager::get_singleton()->get_interface_count(); i++) {
@@ -492,6 +492,27 @@ TEST_SUITE("[[TextServer]") {
 			}
 		}
 
+		SUBCASE("[TextServer] Unicode identifiers") {
+			for (int i = 0; i < TextServerManager::get_singleton()->get_interface_count(); i++) {
+				Ref<TextServer> ts = TextServerManager::get_singleton()->get_interface(i);
+				TEST_FAIL_COND(ts.is_null(), "Invalid TS interface.");
+
+				static const char32_t *data[19] = { U"-30", U"100", U"10.1", U"10,1", U"1e2", U"1e-2", U"1e2e3", U"0xAB", U"AB", U"Test1", U"1Test", U"Test*1", U"test_testeT", U"test_tes teT", U"عَلَيْكُمْ", U"عَلَيْكُمْTest", U"ӒӖӚӜ", U"_test", U"ÂÃÄÅĀĂĄÇĆĈĊ" };
+				static bool isid[19] = { false, false, false, false, false, false, false, false, true, true, false, false, true, false, true, true, true, true, true };
+				for (int j = 0; j < 19; j++) {
+					String s = String(data[j]);
+					CHECK(ts->is_valid_identifier(s) == isid[j]);
+				}
+
+				if (ts->has_feature(TextServer::FEATURE_UNICODE_IDENTIFIERS)) {
+					// Test UAX 3.2 ZW(N)J usage.
+					CHECK(ts->is_valid_identifier(U"\u0646\u0627\u0645\u0647\u200C\u0627\u06CC"));
+					CHECK(ts->is_valid_identifier(U"\u0D26\u0D43\u0D15\u0D4D\u200C\u0D38\u0D3E\u0D15\u0D4D\u0D37\u0D3F"));
+					CHECK(ts->is_valid_identifier(U"\u0DC1\u0DCA\u200D\u0DBB\u0DD3"));
+				}
+			}
+		}
+
 		SUBCASE("[TextServer] Strip Diacritics") {
 			for (int i = 0; i < TextServerManager::get_singleton()->get_interface_count(); i++) {
 				Ref<TextServer> ts = TextServerManager::get_singleton()->get_interface(i);