codama_nodes/count_nodes/
prefixed_count_node.rs

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use crate::{NestedTypeNode, NumberTypeNode};
use codama_nodes_derive::node;

#[node]
pub struct PrefixedCountNode {
    // Data.
    pub prefix: NestedTypeNode<NumberTypeNode>,
}

impl From<PrefixedCountNode> for crate::Node {
    fn from(val: PrefixedCountNode) -> Self {
        crate::Node::Count(val.into())
    }
}

impl PrefixedCountNode {
    pub fn new<T>(prefix: T) -> Self
    where
        T: Into<NestedTypeNode<NumberTypeNode>>,
    {
        Self {
            prefix: prefix.into(),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{Endian, NestedTypeNodeTrait, PreOffsetTypeNode, U32};

    #[test]
    fn new() {
        let node = PrefixedCountNode::new(NumberTypeNode::le(U32));
        assert_eq!(
            node.prefix,
            NestedTypeNode::Value(NumberTypeNode::new(U32, Endian::Little))
        );
        assert_eq!(
            node.prefix.get_nested_type_node(),
            &NumberTypeNode::new(U32, Endian::Little)
        );
    }

    #[test]
    fn new_with_nested_prefix() {
        let node = PrefixedCountNode::new(PreOffsetTypeNode::absolute(NumberTypeNode::le(U32), 0));
        assert_eq!(
            node.prefix,
            NestedTypeNode::PreOffset(PreOffsetTypeNode::absolute(
                NestedTypeNode::Value(NumberTypeNode::new(U32, Endian::Little)),
                0
            ))
        );
        assert_eq!(
            node.prefix.get_nested_type_node(),
            &NumberTypeNode::new(U32, Endian::Little)
        );
    }

    #[test]
    fn to_json() {
        let node = PrefixedCountNode::new(NumberTypeNode::le(U32));
        let json = serde_json::to_string(&node).unwrap();
        assert_eq!(
            json,
            r#"{"kind":"prefixedCountNode","prefix":{"kind":"numberTypeNode","format":"u32","endian":"le"}}"#
        );
    }

    #[test]
    fn from_json() {
        let json = r#"{"kind":"prefixedCountNode","prefix":{"kind":"numberTypeNode","format":"u32","endian":"le"}}"#;
        let node: PrefixedCountNode = serde_json::from_str(json).unwrap();
        assert_eq!(node, PrefixedCountNode::new(NumberTypeNode::le(U32)));
    }
}