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//! JSON arbitrary serialization support for Tree.
use crate::tree::Tree;
impl Tree {
/// Deserializes arbitrary JSON data into a tree structure.
///
/// Requires the `arbitrary-json` feature.
///
/// This function can parse any JSON file and convert it to a Tree representation,
/// where objects become nodes and values become leaves.
///
/// # Examples
///
/// ```
/// use treelog::Tree;
///
/// let json_str = r#"
/// {
/// "package": {
/// "name": "treelog",
/// "version": "0.0.4"
/// }
/// }
/// "#;
/// let tree = Tree::from_arbitrary_json(json_str).unwrap();
/// ```
pub fn from_arbitrary_json(json_str: &str) -> Result<Self, serde_json::Error> {
let value: serde_json::Value = serde_json::from_str(json_str)?;
Ok(Self::from_json_value(&value))
}
// Helper functions for JSON conversion
fn from_json_value(value: &serde_json::Value) -> Self {
match value {
serde_json::Value::String(s) => Tree::new_leaf(format!("\"{}\"", s)),
serde_json::Value::Number(n) => {
if let Some(i) = n.as_i64() {
Tree::new_leaf(i.to_string())
} else if let Some(f) = n.as_f64() {
Tree::new_leaf(f.to_string())
} else {
Tree::new_leaf(n.to_string())
}
}
serde_json::Value::Bool(b) => Tree::new_leaf(b.to_string()),
serde_json::Value::Null => Tree::new_leaf("null".to_string()),
serde_json::Value::Array(arr) => {
let children: Vec<Tree> = arr
.iter()
.enumerate()
.map(|(idx, val)| {
let child = Self::from_json_value(val);
Tree::Node(format!("[{}]", idx), vec![child])
})
.collect();
if children.is_empty() {
Tree::new_leaf("[]")
} else {
Tree::Node("array".to_string(), children)
}
}
serde_json::Value::Object(obj) => {
let children: Vec<Tree> = obj
.iter()
.map(|(key, val)| {
let child = Self::from_json_value(val);
if child.is_leaf() {
let leaf_lines = child.lines().unwrap();
if leaf_lines.len() == 1 {
Tree::new_leaf(format!("\"{}\": {}", key, leaf_lines[0]))
} else {
Tree::Node(key.clone(), vec![child])
}
} else {
Tree::Node(key.clone(), vec![child])
}
})
.collect();
if children.is_empty() {
Tree::new_leaf("{}")
} else {
Tree::Node("object".to_string(), children)
}
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_from_arbitrary_json() {
let json_str = r#"
{
"package": {
"name": "treelog",
"version": "0.0.4"
}
}
"#;
let tree = Tree::from_arbitrary_json(json_str);
assert!(tree.is_ok());
let tree = tree.unwrap();
assert!(tree.is_node());
}
#[test]
fn test_from_arbitrary_json_array() {
let json_str = r#"{"dependencies": ["serde", "toml"]}"#;
let tree = Tree::from_arbitrary_json(json_str);
assert!(tree.is_ok());
}
}