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//! Utility functionality.
use std::iter::Peekable;
use std::str::Split;
use unicode_xid::UnicodeXID;
/// Types that can be splined.
pub trait Splinor {
/// Returns an iterator over the substrings splitted by the pattern,
/// intertwined with the splinor.
///
/// # Example
///
/// ```ignore
/// #[derive(Debug, Copy, Clone, PartialEq)]
/// struct Space;
///
/// let v: Vec<Splined<Space>> = "My airplane flies!".spline(" ", Space).collect();
/// assert_eq!(v, [
/// Splined::Value("My"),
/// Splined::Splinor(Space),
/// Splined::Value("airplane"),
/// Splined::Splinor(Space),
/// Splined::Value("flies!"),
/// ]);
/// ```
fn spline<'s, T: Clone>(&'s self, pat: &'s str, splinor: T) -> Spline<'s, T>;
}
impl Splinor for str {
fn spline<'s, T: Clone>(&'s self, pat: &'s str, splinor: T) -> Spline<'s, T> {
Spline {
splinor: Splined::Splinor(splinor),
split: self.split(pat).peekable(),
next_splinor: false,
}
}
}
/// Iterator over splitted values and splinors.
///
/// Created by the [`spline`](Splinor::spline) function.
#[derive(Debug, Clone)]
pub struct Spline<'s, T> {
splinor: Splined<'s, T>,
split: Peekable<Split<'s, &'s str>>,
next_splinor: bool,
}
/// Represents either a splitted substring or a splinor.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum Splined<'s, T> {
/// A substring.
Value(&'s str),
/// An intertwined splinor.
Splinor(T),
}
impl<'s, T: Clone> Iterator for Spline<'s, T> {
type Item = Splined<'s, T>;
fn next(&mut self) -> Option<Splined<'s, T>> {
if self.next_splinor && self.split.peek().is_some() {
self.next_splinor = false;
return Some(self.splinor.clone());
} else {
self.next_splinor = true;
return Some(Splined::Value(self.split.next()?))
}
}
}
/// More useful functions on `str`'s.
pub trait StrExt {
/// Whether self consists only of whitespace.
fn is_whitespace(&self) -> bool;
/// Whether this word is a valid unicode identifier.
fn is_identifier(&self) -> bool;
}
impl StrExt for str {
fn is_whitespace(&self) -> bool {
self.chars().all(|c| c.is_whitespace() && c != '\n')
}
fn is_identifier(&self) -> bool {
let mut chars = self.chars();
match chars.next() {
Some(c) if !UnicodeXID::is_xid_start(c) => return false,
None => return false,
_ => (),
}
while let Some(c) = chars.next() {
if !UnicodeXID::is_xid_continue(c) {
return false;
}
}
true
}
}
#[cfg(test)]
mod splinor_tests {
use super::*;
use Splined::{Value as V, Splinor as S};
#[derive(Debug, Copy, Clone, PartialEq)]
enum Token { DoubleUnderscore }
fn test<T>(string: &str, pat: &str, splinor: T, vec: Vec<Splined<T>>)
where T: std::fmt::Debug + Clone + PartialEq {
assert_eq!(string.spline(pat, splinor).collect::<Vec<_>>(), vec);
}
#[test]
fn splinor() {
let s = S(Token::DoubleUnderscore);
test("__he__llo__world__", "__", Token::DoubleUnderscore,
vec![V(""), s, V("he"), s, V("llo"), s, V("world"), s, V("")]);
test("__Italic__", "__", Token::DoubleUnderscore,
vec![V(""), s, V("Italic"), s, V("")]);
test("Key__Value", "__", Token::DoubleUnderscore,
vec![V("Key"), s, V("Value")]);
test("__Start__NoEnd", "__", Token::DoubleUnderscore,
vec![V(""), s, V("Start"), s, V("NoEnd")]);
test("NoStart__End__", "__", Token::DoubleUnderscore,
vec![V("NoStart"), s, V("End"), s, V("")]);
}
}
|
