4 files changed, 36 insertions, 0 deletions
diff --git a/servers/text/text_server_extension.cpp b/servers/text/text_server_extension.cpp
index 47598abce7..c2387be80d 100644
--- a/servers/text/text_server_extension.cpp
+++ b/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)) {
diff --git a/servers/text/text_server_extension.h b/servers/text/text_server_extension.h
index 571753ea67..3814e2ad88 100644
--- a/servers/text/text_server_extension.h
+++ b/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 &);
diff --git a/servers/text_server.cpp b/servers/text_server.cpp
index 4a6b03d943..1ea05795f1 100644
--- a/servers/text_server.cpp
+++ b/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();
 }
diff --git a/servers/text_server.h b/servers/text_server.h
index f6ab165bfc..0e57bcbb6c 100644
--- a/servers/text_server.h
+++ b/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;