Expose String.get_slice

(cherry picked from commit e5725c7debd025be9f7b475527324b4b934fed58)

core/variant_call.cpp

@@ -245,6 +245,7 @@ struct _VariantCall {
 	VCALL_LOCALMEM3R(String, count);
 	VCALL_LOCALMEM3R(String, countn);
 	VCALL_LOCALMEM2R(String, substr);
+	VCALL_LOCALMEM2R(String, get_slice);
 	VCALL_LOCALMEM2R(String, find);
 	VCALL_LOCALMEM1R(String, find_last);
 	VCALL_LOCALMEM2R(String, findn);
@@ -1633,6 +1634,7 @@ void register_variant_methods() {
 	ADDFUNC1R(STRING, INT, String, naturalnocasecmp_to, STRING, "to", varray());
 	ADDFUNC0R(STRING, INT, String, length, varray());
 	ADDFUNC2R(STRING, STRING, String, substr, INT, "from", INT, "len", varray(-1));
+	ADDFUNC2R(STRING, STRING, String, get_slice, STRING, "delimiter", INT, "slice", varray());
 
 	ADDFUNC2R(STRING, INT, String, find, STRING, "what", INT, "from", varray(0));
 

doc/classes/String.xml

@@ -335,6 +335,19 @@
 				If the string is a valid file path, returns the filename.
 			</description>
 		</method>
+		<method name="get_slice">
+			<return type="String" />
+			<argument index="0" name="delimiter" type="String" />
+			<argument index="1" name="slice" type="int" />
+			<description>
+				Splits a string using a [code]delimiter[/code] and returns a substring at index [code]slice[/code]. Returns an empty string if the index doesn't exist.
+				This is a more performant alternative to [method split] for cases when you need only one element from the array at a fixed index.
+				Example:
+				[codeblock]
+				print("i/am/example/string".get_slice("/", 2)) # Prints 'example'.
+				[/codeblock]
+			</description>
+		</method>
 		<method name="hash">
 			<return type="int" />
 			<description>
@@ -690,6 +703,7 @@
 			<description>
 				Splits the string by a [code]delimiter[/code] string and returns an array of the substrings. The [code]delimiter[/code] can be of any length.
 				If [code]maxsplit[/code] is specified, it defines the number of splits to do from the left up to [code]maxsplit[/code]. The default value of [code]0[/code] means that all items are split.
+				If you need only one element from the array at a specific index, [method get_slice] is a more performant option.
 				Example:
 				[codeblock]
 				var some_string = "One,Two,Three,Four"