kfl 0.5.0

Another KDL language implementation
Documentation 
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//! Structures that represent abstract syntax tree (AST) of the KDL document

use alloc::{borrow::ToOwned, boxed::Box, collections::BTreeMap, vec::Vec};
use core::fmt::{self, Debug, Pointer};

use crate::own;

/// Single node of the KDL document
#[derive(Debug, Clone)]
#[cfg_attr(feature = "minicbor", derive(minicbor::Encode, minicbor::Decode))]
pub struct Node {
    /// A type name if specified in parenthesis
    #[cfg_attr(feature = "minicbor", n(0))]
    pub type_name: Option<Box<str>>,
    /// A node name
    #[cfg_attr(feature = "minicbor", n(1))]
    pub node_name: Box<str>,
    /// Positional arguments
    #[cfg_attr(feature = "minicbor", n(2))]
    pub arguments: Vec<Scalar>,
    /// Named properties
    #[cfg_attr(feature = "minicbor", n(3))]
    pub properties: BTreeMap<Box<str>, Scalar>,
    /// Node's children. This field is not none if there are braces `{..}`
    #[cfg_attr(feature = "minicbor", n(4))]
    pub children: Option<Vec<Node>>,
}

/// Possibly typed KDL scalar value
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "minicbor", derive(minicbor::Encode, minicbor::Decode))]
pub struct Scalar {
    /// A type name if specified in parenthesis
    #[cfg_attr(feature = "minicbor", n(0))]
    pub type_name: Option<Box<str>>,
    /// The actual value literal
    #[cfg_attr(feature = "minicbor", n(1))]
    pub literal: Box<str>,
}

impl Node {
    /// TODO
    pub fn new(name: &str) -> Self {
        Self {
            type_name: None,
            node_name: own!(name),
            arguments: Vec::new(),
            properties: BTreeMap::new(),
            children: None,
        }
    }
    /// Returns node children
    pub fn children(&self) -> impl ExactSizeIterator<Item = &Node> {
        self.children
            .as_ref()
            .map(|c| c.iter())
            .unwrap_or_else(|| [].iter())
    }
}

impl Scalar {
    /// TODO
    pub fn new(type_name: Box<str>, literal: Box<str>) -> Self {
        Self {
            type_name: Some(type_name),
            literal,
        }
    }
}

impl From<Box<str>> for Scalar {
    fn from(value: Box<str>) -> Self {
        Scalar {
            type_name: None,
            literal: value,
        }
    }
}

macro_rules! impl_pointer {
    ($ty:ty) => {
        impl Pointer for $ty {
            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                let ptr = self as *const Self;
                Pointer::fmt(&ptr, f)
            }
        }
    };
}

impl_pointer!(Node);
impl_pointer!(Scalar);