parseal 0.2.4

An easy way to create your own parsers
Documentation 
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use std::{collections::HashMap, fmt};

use crate::{
    parsing::{self, tokens, Identifier, Number, Parse, StringValue},
    Parsable,
};

#[derive(Clone, Parsable, Debug)]
pub struct NamedValue<N, S, I>(N, S, I)
where
    N: Parse,
    S: tokens::Token,
    I: Parse;

impl<T, N, S, I> From<NamedValue<N, S, I>> for (String, T)
where
    T: From<I>,
    N: Parse,
    String: From<N>,
    S: tokens::Token,
    I: Parse,
{
    fn from(value: NamedValue<N, S, I>) -> Self {
        (value.0.into(), value.2.into())
    }
}

#[derive(Parsable, Clone, Debug)]
pub enum ParseValue {
    String(StringValue),
    Number(Number),
    Bool(#[value("true", "false")] Identifier),
}

#[derive(Parsable, Clone, Debug)]
pub enum ParseNode<Object, List>
where
    Object: Parse + fmt::Debug,
    List: Parse + fmt::Debug,
{
    Value(ParseValue),
    Object(Object),
    List(List),
}

#[derive(Debug)]
pub enum Value {
    String(String),
    Number(usize),
    Bool(bool),
}

impl From<ParseValue> for Value {
    fn from(value: ParseValue) -> Self {
        match value {
            ParseValue::String(value) => Self::String(value.into()),
            ParseValue::Number(value) => Self::Number(value.into()),
            ParseValue::Bool(value) => Self::Bool(value.name() == "true"),
        }
    }
}

#[derive(Debug)]
pub enum Node {
    Value(Value),
    Object(HashMap<String, Node>),
    List(Vec<Node>),
}

impl<Object, List> From<ParseNode<Object, List>> for Node
where
    Object: Parse + fmt::Debug,
    List: Parse + fmt::Debug,
    HashMap<String, ParseNode<Object, List>>: From<Object>,
    Vec<ParseNode<Object, List>>: From<List>,
{
    fn from(value: ParseNode<Object, List>) -> Self {
        match value {
            ParseNode::Value(value) => Self::Value(value.into()),
            ParseNode::Object(value) => {
                let map: HashMap<String, ParseNode<Object, List>> = value.into();
                let map = map
                    .iter()
                    .map(|(key, value)| {
                        let node: Node = value.clone().into();
                        (key.clone(), node)
                    })
                    .collect::<HashMap<String, Node>>();
                Self::Object(map)
            }
            ParseNode::List(value) => {
                let list: Vec<_> = value.into();
                let list = list.iter().map(|item| item.clone().into()).collect();
                Self::List(list)
            }
        }
    }
}

pub trait TreeData {
    type Object: Parse + fmt::Debug;
    type List: Parse + fmt::Debug;

    fn value(&self) -> ParseNode<Self::Object, Self::List>;
}

impl<
        Object: Parse + fmt::Debug,
        List: Parse + fmt::Debug,
        T: TreeData<Object = Object, List = List> + fmt::Debug,
    > From<T> for Node
where
    HashMap<String, ParseNode<Object, List>>: From<Object>,
    Vec<ParseNode<Object, List>>: From<List>,
{
    fn from(tree: T) -> Self {
        tree.value().into()
    }
}

impl<
        Object: Parse + fmt::Debug,
        List: Parse + fmt::Debug,
        T: TreeData<Object = Object, List = List>,
    > From<T> for ParseNode<T::Object, T::List>
{
    fn from(tree: T) -> Self {
        tree.value()
    }
}