build(rust): vendor rnix parser crate

third_party/crates/text-size-1.1.1/src/traits.rs

@@ -0,0 +1,36 @@
+use {crate::TextSize, std::convert::TryInto};
+
+use priv_in_pub::Sealed;
+mod priv_in_pub {
+    pub trait Sealed {}
+}
+
+/// Primitives with a textual length that can be passed to [`TextSize::of`].
+pub trait TextLen: Copy + Sealed {
+    /// The textual length of this primitive.
+    fn text_len(self) -> TextSize;
+}
+
+impl Sealed for &'_ str {}
+impl TextLen for &'_ str {
+    #[inline]
+    fn text_len(self) -> TextSize {
+        self.len().try_into().unwrap()
+    }
+}
+
+impl Sealed for &'_ String {}
+impl TextLen for &'_ String {
+    #[inline]
+    fn text_len(self) -> TextSize {
+        self.as_str().text_len()
+    }
+}
+
+impl Sealed for char {}
+impl TextLen for char {
+    #[inline]
+    fn text_len(self) -> TextSize {
+        (self.len_utf8() as u32).into()
+    }
+}