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use crate::*;
use std::iter::FromIterator;
use std::ops::Add;
use std::rc::Rc;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InterpolatedText<Note, Embed> {
head: String,
tail: Vec<(Rc<Expr<Note, Embed>>, String)>,
}
impl<N, E> From<(String, Vec<(Rc<Expr<N, E>>, String)>)>
for InterpolatedText<N, E>
{
fn from(x: (String, Vec<(Rc<Expr<N, E>>, String)>)) -> Self {
InterpolatedText {
head: x.0,
tail: x.1,
}
}
}
impl<N, E> From<String> for InterpolatedText<N, E> {
fn from(s: String) -> Self {
InterpolatedText {
head: s,
tail: vec![],
}
}
}
#[derive(Debug, Clone)]
pub enum InterpolatedTextContents<Note, Embed> {
Text(String),
Expr(SubExpr<Note, Embed>),
}
impl<N, E> InterpolatedText<N, E> {
pub fn map<N2, E2, F>(&self, mut f: F) -> InterpolatedText<N2, E2>
where
F: FnMut(&Rc<Expr<N, E>>) -> Rc<Expr<N2, E2>>,
{
InterpolatedText {
head: self.head.clone(),
tail: self.tail.iter().map(|(e, s)| (f(e), s.clone())).collect(),
}
}
pub fn iter<'a>(
&'a self,
) -> impl Iterator<Item = InterpolatedTextContents<N, E>> + 'a {
use std::iter::once;
once(InterpolatedTextContents::Text(self.head.clone())).chain(
self.tail.iter().flat_map(|(e, s)| {
once(InterpolatedTextContents::Expr(Rc::clone(e)))
.chain(once(InterpolatedTextContents::Text(s.clone())))
}),
)
}
}
impl<'a, N: 'a, E: 'a> FromIterator<InterpolatedTextContents<N, E>>
for InterpolatedText<N, E>
{
fn from_iter<T>(iter: T) -> Self
where
T: IntoIterator<Item = InterpolatedTextContents<N, E>>,
{
let mut res = InterpolatedText {
head: "".to_owned(),
tail: vec![],
};
let mut crnt_str = &mut res.head;
for x in iter.into_iter() {
match x {
InterpolatedTextContents::Text(s) => crnt_str.push_str(&s),
InterpolatedTextContents::Expr(e) => {
res.tail.push((e.clone(), "".to_owned()));
crnt_str = &mut res.tail.last_mut().unwrap().1;
}
}
}
res
}
}
impl<N, E> Add for &InterpolatedText<N, E> {
type Output = InterpolatedText<N, E>;
fn add(self, rhs: &InterpolatedText<N, E>) -> Self::Output {
self.iter().chain(rhs.iter()).collect()
}
}
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