Implement TextServer `strip_diacritics` function.

doc/classes/TextServer.xml

@@ -1233,6 +1233,13 @@
 				Aligns shaped text to the given tab-stops.
 			</description>
 		</method>
+		<method name="strip_diacritics" qualifiers="const">
+			<return type="String" />
+			<argument index="0" name="string" type="String" />
+			<description>
+				Strips diacritics from the string.
+			</description>
+		</method>
 		<method name="tag_to_name" qualifiers="const">
 			<return type="String" />
 			<argument index="0" name="tag" type="int" />

modules/text_server_adv/text_server_adv.cpp

@@ -4924,6 +4924,39 @@ String TextServerAdvanced::percent_sign(const String &p_language) const {
 	return "%";
 }
 
+String TextServerAdvanced::strip_diacritics(const String &p_string) const {
+	UErrorCode err = U_ZERO_ERROR;
+
+	// Get NFKD normalizer singleton.
+	const UNormalizer2 *unorm = unorm2_getNFKDInstance(&err);
+	ERR_FAIL_COND_V_MSG(U_FAILURE(err), TextServer::strip_diacritics(p_string), u_errorName(err));
+
+	// Convert to UTF-16.
+	Char16String utf16 = p_string.utf16();
+
+	// Normalize.
+	Char16String normalized;
+	err = U_ZERO_ERROR;
+	int32_t len = unorm2_normalize(unorm, utf16.ptr(), -1, nullptr, 0, &err);
+	ERR_FAIL_COND_V_MSG(err != U_BUFFER_OVERFLOW_ERROR, TextServer::strip_diacritics(p_string), u_errorName(err));
+	normalized.resize(len);
+	err = U_ZERO_ERROR;
+	unorm2_normalize(unorm, utf16.ptr(), -1, normalized.ptrw(), len, &err);
+	ERR_FAIL_COND_V_MSG(U_FAILURE(err), TextServer::strip_diacritics(p_string), u_errorName(err));
+
+	// Convert back to UTF-32.
+	String normalized_string = String::utf16(normalized.ptr(), len);
+
+	// Strip combining characters.
+	String result;
+	for (int i = 0; i < normalized_string.length(); i++) {
+		if (u_getCombiningClass(normalized_string[i]) == 0) {
+			result += normalized_string[i];
+		}
+	}
+	return result;
+}
+
 TextServerAdvanced::TextServerAdvanced() {
 	_insert_num_systems_lang();
 	_insert_feature_sets();

modules/text_server_adv/text_server_adv.h

@@ -50,6 +50,7 @@
 #include <unicode/udata.h>
 #include <unicode/uiter.h>
 #include <unicode/uloc.h>
+#include <unicode/unorm2.h>
 #include <unicode/uscript.h>
 #include <unicode/ustring.h>
 #include <unicode/utypes.h>
@@ -501,6 +502,8 @@ public:
 	virtual String parse_number(const String &p_string, const String &p_language = "") const override;
 	virtual String percent_sign(const String &p_language = "") const override;
 
+	virtual String strip_diacritics(const String &p_string) const override;
+
 	TextServerAdvanced();
 	~TextServerAdvanced();
 };

servers/text_server.cpp

@@ -42,7 +42,7 @@ void TextServerManager::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("find_interface", "name"), &TextServerManager::find_interface);
 
 	ClassDB::bind_method(D_METHOD("set_primary_interface", "index"), &TextServerManager::set_primary_interface);
-	ClassDB::bind_method(D_METHOD("get_primary_interface"), &TextServerManager::_get_primary_interface);
+	ClassDB::bind_method(D_METHOD("get_primary_interface"), &TextServerManager::get_primary_interface);
 
 	ADD_SIGNAL(MethodInfo("interface_added", PropertyInfo(Variant::STRING_NAME, "interface_name")));
 	ADD_SIGNAL(MethodInfo("interface_removed", PropertyInfo(Variant::STRING_NAME, "interface_name")));
@@ -118,10 +118,6 @@ Array TextServerManager::get_interfaces() const {
 	return ret;
 }
 
-Ref<TextServer> TextServerManager::_get_primary_interface() const {
-	return primary_interface;
-}
-
 void TextServerManager::set_primary_interface(const Ref<TextServer> &p_primary_interface) {
 	if (p_primary_interface.is_null()) {
 		print_verbose("TextServer: Clearing primary interface");
@@ -407,6 +403,8 @@ void TextServer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("parse_number", "number", "language"), &TextServer::parse_number, DEFVAL(""));
 	ClassDB::bind_method(D_METHOD("percent_sign", "language"), &TextServer::percent_sign, DEFVAL(""));
 
+	ClassDB::bind_method(D_METHOD("strip_diacritics", "string"), &TextServer::strip_diacritics);
+
 	/* Direction */
 	BIND_ENUM_CONSTANT(DIRECTION_AUTO);
 	BIND_ENUM_CONSTANT(DIRECTION_LTR);
@@ -1317,6 +1315,134 @@ void TextServer::shaped_text_draw_outline(RID p_shaped, RID p_canvas, const Vect
 	}
 }
 
+void TextServer::_diacritics_map_add(const String &p_from, char32_t p_to) {
+	for (int i = 0; i < p_from.size(); i++) {
+		diacritics_map[p_from[i]] = p_to;
+	}
+}
+
+void TextServer::_init_diacritics_map() {
+	diacritics_map.clear();
+
+	// Latin.
+	_diacritics_map_add(U"ÀÁÂÃÄÅĀĂĄǍǞǠǺȀȂȦḀẠẢẤẦẨẪẬẮẰẲẴẶ", U'A');
+	_diacritics_map_add(U"àáâãäåāăąǎǟǡǻȁȃȧḁẚạảấầẩẫậắằẳẵặ", U'a');
+	_diacritics_map_add(U"ǢǼ", U'Æ');
+	_diacritics_map_add(U"ǣǽ", U'æ');
+	_diacritics_map_add(U"ḂḄḆ", U'B');
+	_diacritics_map_add(U"ḃḅḇ", U'b');
+	_diacritics_map_add(U"ÇĆĈĊČḈ", U'C');
+	_diacritics_map_add(U"çćĉċčḉ", U'c');
+	_diacritics_map_add(U"ĎḊḌḎḐḒ", U'D');
+	_diacritics_map_add(U"ďḋḍḏḑḓ", U'd');
+	_diacritics_map_add(U"ÈÉÊËĒĔĖĘĚȆȨḔḖḘḚḜẸẺẼẾỀỂỄỆ", U'E');
+	_diacritics_map_add(U"èéêëēĕėęěȇȩḕḗḙḛḝẹẻẽếềểễệ", U'e');
+	_diacritics_map_add(U"Ḟ", U'F');
+	_diacritics_map_add(U"ḟ", U'f');
+	_diacritics_map_add(U"ĜĞĠĢǦǴḠ", U'G');
+	_diacritics_map_add(U"ĝğġģǧǵḡ", U'g');
+	_diacritics_map_add(U"ĤȞḢḤḦḨḪ", U'H');
+	_diacritics_map_add(U"ĥȟḣḥḧḩḫẖ", U'h');
+	_diacritics_map_add(U"ÌÍÎÏĨĪĬĮİǏȈȊḬḮỈỊ", U'I');
+	_diacritics_map_add(U"ìíîïĩīĭįıǐȉȋḭḯỉị", U'i');
+	_diacritics_map_add(U"Ĵ", U'J');
+	_diacritics_map_add(U"ĵ", U'j');
+	_diacritics_map_add(U"ĶǨḰḲḴ", U'K');
+	_diacritics_map_add(U"ķĸǩḱḳḵ", U'k');
+	_diacritics_map_add(U"ĹĻĽĿḶḸḺḼ", U'L');
+	_diacritics_map_add(U"ĺļľŀḷḹḻḽ", U'l');
+	_diacritics_map_add(U"ḾṀṂ", U'M');
+	_diacritics_map_add(U"ḿṁṃ", U'm');
+	_diacritics_map_add(U"ÑŃŅŇǸṄṆṈṊ", U'N');
+	_diacritics_map_add(U"ñńņňʼnǹṅṇṉṋ", U'n');
+	_diacritics_map_add(U"ÒÓÔÕÖŌŎŐƠǑǪǬȌȎȪȬȮȰṌṎṐṒỌỎỐỒỔỖỘỚỜỞỠỢ", U'O');
+	_diacritics_map_add(U"òóôõöōŏőơǒǫǭȍȏȫȭȯȱṍṏṑṓọỏốồổỗộớờởỡợ", U'o');
+	_diacritics_map_add(U"ṔṖ", U'P');
+	_diacritics_map_add(U"ṗṕ", U'p');
+	_diacritics_map_add(U"ŔŖŘȐȒṘṚṜṞ", U'R');
+	_diacritics_map_add(U"ŕŗřȑȓṙṛṝṟ", U'r');
+	_diacritics_map_add(U"ŚŜŞŠȘṠṢṤṦṨ", U'S');
+	_diacritics_map_add(U"śŝşšſșṡṣṥṧṩẛẜẝ", U's');
+	_diacritics_map_add(U"ŢŤȚṪṬṮṰ", U'T');
+	_diacritics_map_add(U"ţťțṫṭṯṱẗ", U't');
+	_diacritics_map_add(U"ÙÚÛÜŨŪŬŮŰŲƯǓǕǗǙǛȔȖṲṴṶṸṺỤỦỨỪỬỮỰ", U'U');
+	_diacritics_map_add(U"ùúûüũūŭůűųưǔǖǘǚǜȕȗṳṵṷṹṻụủứừửữự", U'u');
+	_diacritics_map_add(U"ṼṾ", U'V');
+	_diacritics_map_add(U"ṽṿ", U'v');
+	_diacritics_map_add(U"ŴẀẂẄẆẈ", U'W');
+	_diacritics_map_add(U"ŵẁẃẅẇẉẘ", U'w');
+	_diacritics_map_add(U"ẊẌ", U'X');
+	_diacritics_map_add(U"ẋẍ", U'x');
+	_diacritics_map_add(U"ÝŶẎỲỴỶỸỾ", U'Y');
+	_diacritics_map_add(U"ýÿŷẏẙỳỵỷỹỿ", U'y');
+	_diacritics_map_add(U"ŹŻŽẐẒẔ", U'Z');
+	_diacritics_map_add(U"źżžẑẓẕ", U'z');
+
+	// Greek.
+	_diacritics_map_add(U"ΆἈἉἊἋἌἍἎἏᾈᾉᾊᾋᾌᾍᾎᾏᾸᾹᾺΆᾼ", U'Α');
+	_diacritics_map_add(U"άἀἁἂἃἄἅἆἇὰάᾀᾁᾂᾃᾄᾅᾆᾇᾰᾱᾲᾳᾴᾶᾷ", U'α');
+	_diacritics_map_add(U"ΈἘἙἚἛἜἝῈΈ", U'Ε');
+	_diacritics_map_add(U"έἐἑἒἓἔἕὲέ", U'ε');
+	_diacritics_map_add(U"ΉἨἩἪἫἬἭἮἯᾘᾙᾚᾛᾜᾝᾞᾟῊΉῌ", U'Η');
+	_diacritics_map_add(U"ήἠἡἢἣἤἥἦἧὴήᾐᾑᾒᾓᾔᾕᾖᾗῂῃῄῆῇ", U'η');
+	_diacritics_map_add(U"ΊΪἸἹἺἻἼἽἾἿῘῙῚΊ", U'Ι');
+	_diacritics_map_add(U"ίΐϊἰἱἲἳἴἵἶἷὶίῐῑῒΐῖῗ", U'ι');
+	_diacritics_map_add(U"ΌὈὉὊὋὌὍῸΌ", U'Ο');
+	_diacritics_map_add(U"όὀὁὂὃὄὅὸό", U'ο');
+	_diacritics_map_add(U"Ῥ", U'Ρ');
+	_diacritics_map_add(U"ῤῥ", U'ρ');
+	_diacritics_map_add(U"ΎΫϓϔὙὛὝὟῨῩῪΎ", U'Υ');
+	_diacritics_map_add(U"ΰϋύὐὑὒὓὔὕὖὗὺύῠῡῢΰῦῧ", U'υ');
+	_diacritics_map_add(U"ΏὨὩὪὫὬὭὮὯᾨᾩᾪᾫᾬᾭᾮᾯῺΏῼ", U'Ω');
+	_diacritics_map_add(U"ώὠὡὢὣὤὥὦὧὼώᾠᾡᾢᾣᾤᾥᾦᾧῲῳῴῶῷ", U'ω');
+
+	// Cyrillic.
+	_diacritics_map_add(U"ӐӒ", U'А');
+	_diacritics_map_add(U"ӑӓ", U'а');
+	_diacritics_map_add(U"ЀЁӖ", U'Е');
+	_diacritics_map_add(U"ѐёӗ", U'е');
+	_diacritics_map_add(U"Ӛ", U'Ә');
+	_diacritics_map_add(U"ӛ", U'ә');
+	_diacritics_map_add(U"Ӝ", U'Ж');
+	_diacritics_map_add(U"ӝ", U'ж');
+	_diacritics_map_add(U"Ӟ", U'З');
+	_diacritics_map_add(U"ӟ", U'з');
+	_diacritics_map_add(U"Ѓ", U'Г');
+	_diacritics_map_add(U"ѓ", U'г');
+	_diacritics_map_add(U"Ї", U'І');
+	_diacritics_map_add(U"ї", U'і');
+	_diacritics_map_add(U"ЍӢӤЙ", U'И');
+	_diacritics_map_add(U"ѝӣӥй", U'и');
+	_diacritics_map_add(U"Ќ", U'К');
+	_diacritics_map_add(U"ќ", U'к');
+	_diacritics_map_add(U"Ӧ", U'О');
+	_diacritics_map_add(U"ӧ", U'о');
+	_diacritics_map_add(U"Ӫ", U'Ө');
+	_diacritics_map_add(U"ӫ", U'ө');
+	_diacritics_map_add(U"Ӭ", U'Э');
+	_diacritics_map_add(U"ӭ", U'э');
+	_diacritics_map_add(U"ЎӮӰӲ", U'У');
+	_diacritics_map_add(U"ўӯӱӳ", U'у');
+	_diacritics_map_add(U"Ӵ", U'Ч');
+	_diacritics_map_add(U"ӵ", U'ч');
+	_diacritics_map_add(U"Ӹ", U'Ы');
+	_diacritics_map_add(U"ӹ", U'ы');
+}
+
+String TextServer::strip_diacritics(const String &p_string) const {
+	String result;
+	for (int i = 0; i < p_string.length(); i++) {
+		if (p_string[i] < 0x02B0 || p_string[i] > 0x036F) { // Skip combining diacritics.
+			if (diacritics_map.has(p_string[i])) {
+				result += diacritics_map[p_string[i]];
+			} else {
+				result += p_string[i];
+			}
+		}
+	}
+	return result;
+}
+
 Array TextServer::_shaped_text_get_glyphs_wrapper(RID p_shaped) const {
 	Array ret;
 
@@ -1393,6 +1519,7 @@ Array TextServer::_shaped_text_get_ellipsis_glyphs_wrapper(RID p_shaped) const {
 }
 
 TextServer::TextServer() {
+	_init_diacritics_map();
 }
 
 TextServer::~TextServer() {

servers/text_server.h

@@ -194,6 +194,10 @@ protected:
 		Vector<Glyph> glyphs_logical;
 	};
 
+	Map<char32_t, char32_t> diacritics_map;
+	void _diacritics_map_add(const String &p_from, char32_t p_to);
+	void _init_diacritics_map();
+
 	static void _bind_methods();
 
 public:
@@ -427,6 +431,8 @@ public:
 	virtual String parse_number(const String &p_string, const String &p_language = "") const { return p_string; };
 	virtual String percent_sign(const String &p_language = "") const { return "%"; };
 
+	virtual String strip_diacritics(const String &p_string) const;
+
 	TextServer();
 	~TextServer();
 };
@@ -509,7 +515,6 @@ public:
 	_FORCE_INLINE_ Ref<TextServer> get_primary_interface() const {
 		return primary_interface;
 	}
-	Ref<TextServer> _get_primary_interface() const;
 	void set_primary_interface(const Ref<TextServer> &p_primary_interface);
 
 	TextServerManager();

tests/test_text_server.h

@@ -265,6 +265,29 @@ TEST_SUITE("[[TextServer]") {
 				font.clear();
 			}
 		}
+
+		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);
+				TEST_FAIL_COND(ts.is_null(), "Invalid TS interface.");
+
+				if (ts->has_feature(TextServer::FEATURE_SHAPING)) {
+					CHECK(ts->strip_diacritics(U"ٱلسَّلَامُ عَلَيْكُمْ") == U"ٱلسلام عليكم");
+				}
+
+				CHECK(ts->strip_diacritics(U"pêches épinards tomates fraises") == U"peches epinards tomates fraises");
+				CHECK(ts->strip_diacritics(U"ΆΈΉΊΌΎΏΪΫϓϔ") == U"ΑΕΗΙΟΥΩΙΥΥΥ");
+				CHECK(ts->strip_diacritics(U"άέήίΐϊΰϋόύώ") == U"αεηιιιυυουω");
+				CHECK(ts->strip_diacritics(U"ЀЁЃ ЇЌЍӢӤЙ ЎӮӰӲ ӐӒӖӚӜӞ ӦӪ Ӭ Ӵ Ӹ") == U"ЕЕГ ІКИИИИ УУУУ ААЕӘЖЗ ОӨ Э Ч Ы");
+				CHECK(ts->strip_diacritics(U"ѐёѓ їќѝӣӥй ўӯӱӳ ӑӓӗӛӝӟ ӧӫ ӭ ӵ ӹ") == U"еег ікииии уууу ааеәжз оө э ч ы");
+				CHECK(ts->strip_diacritics(U"ÀÁÂÃÄÅĀĂĄÇĆĈĊČĎÈÉÊËĒĔĖĘĚĜĞĠĢĤÌÍÎÏĨĪĬĮİĴĶĹĻĽÑŃŅŇŊÒÓÔÕÖØŌŎŐƠŔŖŘŚŜŞŠŢŤÙÚÛÜŨŪŬŮŰŲƯŴÝŶŹŻŽ") == U"AAAAAAAAACCCCCDEEEEEEEEEGGGGHIIIIIIIIIJKLLLNNNNŊOOOOOØOOOORRRSSSSTTUUUUUUUUUUUWYYZZZ");
+				CHECK(ts->strip_diacritics(U"àáâãäåāăąçćĉċčďèéêëēĕėęěĝğġģĥìíîïĩīĭįĵķĺļľñńņňŋòóôõöøōŏőơŕŗřśŝşšţťùúûüũūŭůűųưŵýÿŷźżž") == U"aaaaaaaaacccccdeeeeeeeeegggghiiiiiiiijklllnnnnŋoooooøoooorrrssssttuuuuuuuuuuuwyyyzzz");
+				CHECK(ts->strip_diacritics(U"ǍǏȈǑǪǬȌȎȪȬȮȰǓǕǗǙǛȔȖǞǠǺȀȂȦǢǼǦǴǨǸȆȐȒȘȚȞȨ Ḁ ḂḄḆ Ḉ ḊḌḎḐḒ ḔḖḘḚḜ Ḟ Ḡ ḢḤḦḨḪ ḬḮ ḰḲḴ ḶḸḺḼ ḾṀṂ ṄṆṈṊ ṌṎṐṒ ṔṖ ṘṚṜṞ ṠṢṤṦṨ ṪṬṮṰ ṲṴṶṸṺ") == U"AIIOOOOOOOOOUUUUUUUAAAAAAÆÆGGKNERRSTHE A BBB C DDDDD EEEEE F G HHHHH II KKK LLLL MMM NNNN OOOO PP RRRR SSSSS TTTT UUUUU");
+				CHECK(ts->strip_diacritics(U"ǎǐȉȋǒǫǭȍȏȫȭȯȱǔǖǘǚǜȕȗǟǡǻȁȃȧǣǽǧǵǩǹȇȑȓșțȟȩ ḁ ḃḅḇ ḉ ḋḍḏḑḓ ḟ ḡ ḭḯ ḱḳḵ ḷḹḻḽ ḿṁṃ ṅṇṉṋ ṍṏṑṓ ṗṕ ṙṛṝṟ ṡṣṥṧṩ ṫṭṯṱ ṳṵṷṹṻ") == U"aiiiooooooooouuuuuuuaaaaaaææggknerrsthe a bbb c ddddd f g ii kkk llll mmm nnnn oooo pp rrrr sssss tttt uuuuu");
+				CHECK(ts->strip_diacritics(U"ṼṾ ẀẂẄẆẈ ẊẌ Ẏ ẐẒẔ") == U"VV WWWWW XX Y ZZZ");
+				CHECK(ts->strip_diacritics(U"ṽṿ ẁẃẅẇẉ ẋẍ ẏ ẑẓẕ ẖ ẗẘẙẛ") == U"vv wwwww xx y zzz h twys");
+			}
+		}
 	}
 }
 }; // namespace TestTextServer