flash_rowan 0.5.7

Biome's custom Rowan definition (forked from biome_rowan)
Documentation 
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use serde::ser::{Serialize, SerializeMap, SerializeSeq, Serializer};
use std::fmt;

use crate::{
    NodeOrToken,
    syntax::{Language, SyntaxNode, SyntaxToken},
};

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_with_trivia())?;
        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())?;

        // To implement this, SyntaxTrivia will need to expose the kind and the length of each trivia
        // state.serialize_entry("leading", &self.leading())?;
        // state.serialize_entry("trailing", &self.trailing())?;
        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()
    }
}

#[cfg(test)]
mod test {
    use crate::raw_language::{RawLanguage, RawLanguageKind, RawLanguageSyntaxFactory};

    #[test]
    pub fn serialization() {
        let mut builder: crate::TreeBuilder<RawLanguage, RawLanguageSyntaxFactory> =
            crate::TreeBuilder::new();
        builder.start_node(RawLanguageKind::ROOT);
        builder.token(RawLanguageKind::LET_TOKEN, "\n\tlet ");
        builder.finish_node();
        let root = builder.finish();

        assert!(serde_json::to_string(&root).is_ok());
    }
}