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use std::iter::FromIterator;
#[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> InterpolatedTextContents<SubExpr> {
pub fn is_empty(&self) -> bool {
use InterpolatedTextContents::{Expr, Text};
match self {
Expr(_) => false,
Text(s) => s.is_empty(),
}
}
}
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 iter<'a>(
&'a self,
) -> impl Iterator<Item = InterpolatedTextContents<SubExpr>> + 'a
where
SubExpr: Clone,
{
use std::iter::once;
use InterpolatedTextContents::{Expr, Text};
once(Text(self.head.clone()))
.chain(self.tail.iter().flat_map(|(e, s)| {
once(Expr(SubExpr::clone(e))).chain(once(Text(s.clone())))
}))
.filter(|c| !c.is_empty())
}
pub fn into_iter(
self,
) -> impl Iterator<Item = InterpolatedTextContents<SubExpr>> {
use std::iter::once;
use InterpolatedTextContents::{Expr, Text};
once(Text(self.head))
.chain(
self.tail
.into_iter()
.flat_map(|(e, s)| once(Expr(e)).chain(once(Text(s)))),
)
.filter(|c| !c.is_empty())
}
}
impl<SubExpr> FromIterator<InterpolatedTextContents<SubExpr>>
for InterpolatedText<SubExpr>
{
fn from_iter<T>(iter: T) -> Self
where
T: IntoIterator<Item = InterpolatedTextContents<SubExpr>>,
{
let mut res = InterpolatedText {
head: String::new(),
tail: Vec::new(),
};
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, String::new()));
crnt_str = &mut res.tail.last_mut().unwrap().1;
}
}
}
res
}
}
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