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use std::iter::FromIterator;
use std::ops::Add;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InterpolatedText<SubExpr> {
head: String,
tail: Vec<(SubExpr, String)>,
}
impl<SubExpr> From<(String, Vec<(SubExpr, String)>)>
for InterpolatedText<SubExpr>
{
fn from(x: (String, Vec<(SubExpr, String)>)) -> Self {
InterpolatedText {
head: x.0,
tail: x.1,
}
}
}
impl<SubExpr> From<String> for InterpolatedText<SubExpr> {
fn from(s: String) -> Self {
InterpolatedText {
head: s,
tail: vec![],
}
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum InterpolatedTextContents<SubExpr> {
Text(String),
Expr(SubExpr),
}
impl<SubExpr> InterpolatedText<SubExpr> {
pub fn traverse_ref<'a, SubExpr2, E, F>(
&'a self,
mut f: F,
) -> Result<InterpolatedText<SubExpr2>, E>
where
F: FnMut(&'a SubExpr) -> Result<SubExpr2, E>,
{
Ok(InterpolatedText {
head: self.head.clone(),
tail: self
.tail
.iter()
.map(|(e, s)| Ok((f(e)?, s.clone())))
.collect::<Result<_, _>>()?,
})
}
pub fn as_ref(&self) -> InterpolatedText<&SubExpr> {
InterpolatedText {
head: self.head.clone(),
tail: self.tail.iter().map(|(e, s)| (e, s.clone())).collect(),
}
}
pub fn iter<'a>(
&'a self,
) -> impl Iterator<Item = InterpolatedTextContents<SubExpr>> + 'a
where
SubExpr: Clone,
{
use std::iter::once;
once(InterpolatedTextContents::Text(self.head.clone())).chain(
self.tail.iter().flat_map(|(e, s)| {
once(InterpolatedTextContents::Expr(SubExpr::clone(e)))
.chain(once(InterpolatedTextContents::Text(s.clone())))
}),
)
}
}
impl<'a, SubExpr: Clone + 'a> FromIterator<InterpolatedTextContents<SubExpr>>
for InterpolatedText<SubExpr>
{
fn from_iter<T>(iter: T) -> Self
where
T: IntoIterator<Item = InterpolatedTextContents<SubExpr>>,
{
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<SubExpr: Clone> Add for &InterpolatedText<SubExpr> {
type Output = InterpolatedText<SubExpr>;
fn add(self, rhs: &InterpolatedText<SubExpr>) -> Self::Output {
self.iter().chain(rhs.iter()).collect()
}
}
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