build(rust): vendor rnix parser crate

third_party/crates/rowan-0.16.1/src/serde_impls.rs

@@ -0,0 +1,66 @@
+use serde::ser::{Serialize, SerializeMap, SerializeSeq, Serializer};
+use std::fmt;
+
+use crate::{
+    api::{Language, SyntaxNode, SyntaxToken},
+    NodeOrToken,
+};
+
+struct SerDisplay<T>(T);
+impl<T: fmt::Display> Serialize for SerDisplay<T> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.collect_str(&self.0)
+    }
+}
+
+struct DisplayDebug<T>(T);
+impl<T: fmt::Debug> fmt::Display for DisplayDebug<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&self.0, f)
+    }
+}
+
+impl<L: Language> Serialize for SyntaxNode<L> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut state = serializer.serialize_map(Some(3))?;
+        state.serialize_entry("kind", &SerDisplay(DisplayDebug(self.kind())))?;
+        state.serialize_entry("text_range", &self.text_range())?;
+        state.serialize_entry("children", &Children(self))?;
+        state.end()
+    }
+}
+
+impl<L: Language> Serialize for SyntaxToken<L> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut state = serializer.serialize_map(Some(3))?;
+        state.serialize_entry("kind", &SerDisplay(DisplayDebug(self.kind())))?;
+        state.serialize_entry("text_range", &self.text_range())?;
+        state.serialize_entry("text", &self.text())?;
+        state.end()
+    }
+}
+
+struct Children<T>(T);
+
+impl<L: Language> Serialize for Children<&'_ SyntaxNode<L>> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut state = serializer.serialize_seq(None)?;
+        self.0.children_with_tokens().try_for_each(|element| match element {
+            NodeOrToken::Node(it) => state.serialize_element(&it),
+            NodeOrToken::Token(it) => state.serialize_element(&it),
+        })?;
+        state.end()
+    }
+}