lilium-transcript 0.1.0

Transcript implementation for Lilium
Documentation 
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use std::{
    any::{type_name, Any, TypeId},
    collections::{btree_map::Entry, BTreeMap},
};

#[derive(Default, Debug)]
pub struct ParamResolver {
    map: BTreeMap<TypeId, usize>,
}

impl ParamResolver {
    pub fn new() -> Self {
        Self {
            map: BTreeMap::new(),
        }
    }

    /// Sets the given param to the given value, trying to a set second value
    /// for the same type will panic.
    pub fn set<T: Any>(mut self, value: usize) -> Self {
        let id = TypeId::of::<T>();
        match self.map.entry(id) {
            Entry::Vacant(e) => {
                e.insert(value);
            }
            Entry::Occupied(e) => {
                if &value != e.get() {
                    panic!(
                        "Tried to set param {} to {} when {} was already set",
                        type_name::<T>(),
                        value,
                        e.get()
                    );
                }
            }
        }
        self
    }

    pub fn get<T: Any>(&self) -> usize {
        let id = TypeId::of::<T>();
        match self.map.get(&id) {
            Some(value) => *value,
            None => {
                panic!("param not present: {}", type_name::<T>());
            }
        }
    }

    fn try_get<T: Any>(&self) -> Option<usize> {
        let id = TypeId::of::<T>();
        self.map.get(&id).cloned()
    }
}

#[derive(Default, Debug)]
pub struct ParamStack {
    frames: Vec<ParamResolver>,
}

impl ParamStack {
    pub fn new(frames: Vec<ParamResolver>) -> Self {
        Self { frames }
    }

    pub fn get<T: Any>(&self) -> usize {
        if self.frames.is_empty() {
            panic!("param get() called on an empty stack");
        }
        for frame in self.frames.iter().rev() {
            if let Some(param) = frame.try_get::<T>() {
                return param;
            }
        }
        panic!("param {} not set in any frame", type_name::<T>());
    }

    pub fn push(&mut self, frame: ParamResolver) {
        self.frames.push(frame);
    }

    pub fn pop(&mut self) {
        if self.frames.pop().is_none() {
            panic!("param pop() called in empty stack");
        }
    }

    pub fn top(&self) -> &ParamResolver {
        self.frames.last().unwrap()
    }
}