GString::get_slice* functions (WIP)

Author: Bromeon

godot-codegen/src/special_cases/special_cases.rs

@@ -235,9 +235,6 @@ pub fn is_builtin_method_exposed(builtin_ty: &TyName, godot_method_name: &str) -
         // TODO maybe consider renaming "match_" -> "matches". The "*n" could technically be "*_n", but is probably OK.
 
         // GString
-        | ("String", "get_slice")
-        | ("String", "get_slicec")
-        | ("String", "get_slice_count")
         | ("String", "find")
         | ("String", "findn")
         | ("String", "count")

godot-core/src/builtin/string/gstring.rs

@@ -209,6 +209,37 @@ impl GString {
         sys::i64_to_ordering(self.as_inner().filenocasecmp_to(to))
     }
 
+    /// Splits the string using a string delimiter and returns the substring at index `slice`.
+    ///
+    /// Returns the original string if delimiter does not occur in the string. Returns `None` if `slice` is out of bounds.
+    ///
+    /// This is faster than [`split()`][Self::split], if you only need one substring.
+    pub fn get_slice(&self, delimiter: impl AsArg<GString>, slice: usize) -> Option<GString> {
+        let sliced = self.as_inner().get_slice(delimiter, slice as i64);
+
+        // Note: self="" always returns None.
+        super::populated_or_none(sliced)
+    }
+
+    /// Returns the total number of slices, when the string is split with the given delimiter.
+    ///
+    /// See also [`split()`][Self::split] and [`get_slice()`][Self::get_slice].
+    pub fn get_slice_count(&self, delimiter: impl AsArg<GString>) -> usize {
+        self.as_inner().get_slice_count(delimiter) as usize
+    }
+
+    /// Splits the string using a Unicode char `delimiter` and returns the substring at index `slice`.
+    ///
+    /// Returns the original string if delimiter does not occur in the string. Returns `None` if `slice` is out of bounds.
+    ///
+    /// This is faster than [`split()`][Self::split], if you only need one substring.
+    pub fn get_slicec(&self, delimiter: char, slice: usize) -> Option<GString> {
+        let sliced = self.as_inner().get_slicec(delimiter as i64, slice as i64);
+
+        // Note: self="" always returns None.
+        super::populated_or_none(sliced)
+    }
+
     ffi_methods! {
         type sys::GDExtensionStringPtr = *mut Self;
 

godot-core/src/builtin/string/mod.rs

@@ -74,3 +74,11 @@ where
 
     (from, len)
 }
+
+fn populated_or_none(s: GString) -> Option<GString> {
+    if s.is_empty() {
+        None
+    } else {
+        Some(s)
+    }
+}