utterance 0.1.2

A parser library for creating readable, natural-language-inspired domain-specific languages.
Documentation 
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use std::rc::Rc;

use crate::parser::tree::{ParseContext, ParseTree};

#[derive(Debug, Clone)]
pub(crate) enum Child<C>
where
    C: ParseContext,
{
    Contains(ParseTree<C>),
    ByRef(Rc<ParseTree<C>>),
}

impl<C> Child<C>
where
    C: ParseContext,
{
    pub fn as_tree(&self) -> &ParseTree<C> {
        match self {
            Self::Contains(tree) => tree,
            Self::ByRef(ptr) => ptr,
        }
    }

    pub fn as_tree_mut(&mut self) -> Option<&mut ParseTree<C>> {
        match self {
            Self::Contains(tree) => Some(tree),
            Self::ByRef(_) => None,
        }
    }

    pub fn into_owned(self) -> Result<ParseTree<C>, Self> {
        match self {
            Self::Contains(tree) => Ok(tree),
            other => Err(other),
        }
    }
}