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|
//! Test helpers.
use crate::{Range, Selection};
use smallvec::SmallVec;
use std::cmp::Reverse;
/// Convert annotated test string to test string and selection.
///
/// `#[|` for primary selection with head before anchor followed by `]#`.
/// `#(|` for secondary selection with head before anchor followed by `)#`.
/// `#[` for primary selection with head after anchor followed by `|]#`.
/// `#(` for secondary selection with head after anchor followed by `|)#`.
///
/// # Examples
///
/// ```
/// use helix_core::{Range, Selection, test::print};
/// use smallvec::smallvec;
///
/// assert_eq!(
/// print("#[a|]#b#(|c)#"),
/// ("abc".to_owned(), Selection::new(smallvec![Range::new(0, 1), Range::new(3, 2)], 0))
/// );
/// ```
///
/// # Panics
///
/// Panics when missing primary or appeared more than once.
/// Panics when missing head or anchor.
/// Panics when head come after head or anchor come after anchor.
pub fn print(s: &str) -> (String, Selection) {
let mut primary_idx = None;
let mut ranges = SmallVec::new();
let mut iter = s.chars().peekable();
let mut left = String::with_capacity(s.len());
'outer: while let Some(c) = iter.next() {
let start = left.len();
if c != '#' {
left.push(c);
continue;
}
let (is_primary, close_pair) = match iter.next() {
Some('[') => (true, ']'),
Some('(') => (false, ')'),
Some(ch) => {
left.push('#');
left.push(ch);
continue;
}
None => break,
};
if is_primary && primary_idx.is_some() {
panic!("primary `#[` already appeared {left:?} {s:?}");
}
let head_at_beg = iter.next_if_eq(&'|').is_some();
while let Some(c) = iter.next() {
if !(c == close_pair && iter.peek() == Some(&'#')) {
left.push(c);
continue;
}
if !head_at_beg {
let prev = left.pop().unwrap();
if prev != '|' {
left.push(prev);
left.push(c);
continue;
}
}
iter.next(); // skip "#"
if is_primary {
primary_idx = Some(ranges.len());
}
let (anchor, head) = match head_at_beg {
true => (left.len(), start),
false => (start, left.len()),
};
ranges.push(Range::new(anchor, head));
continue 'outer;
}
if head_at_beg {
panic!("missing end `{close_pair}#` {left:?} {s:?}");
} else {
panic!("missing end `|{close_pair}#` {left:?} {s:?}");
}
}
let primary = match primary_idx {
Some(i) => i,
None => panic!("missing primary `#[|]#` {s:?}"),
};
let selection = Selection::new(ranges, primary);
(left, selection)
}
/// Convert test string and selection to annotated test string.
///
/// `#[|` for primary selection with head before anchor followed by `]#`.
/// `#(|` for secondary selection with head before anchor followed by `)#`.
/// `#[` for primary selection with head after anchor followed by `|]#`.
/// `#(` for secondary selection with head after anchor followed by `|)#`.
///
/// # Examples
///
/// ```
/// use helix_core::{Range, Selection, test::plain};
/// use smallvec::smallvec;
///
/// assert_eq!(
/// plain("abc", Selection::new(smallvec![Range::new(0, 1), Range::new(3, 2)], 0)),
/// "#[a|]#b#(|c)#".to_owned()
/// );
/// ```
pub fn plain(s: &str, selection: Selection) -> String {
let primary = selection.primary_index();
let mut out = String::with_capacity(s.len() + 5 * selection.len());
out.push_str(s);
let mut insertion: Vec<_> = selection
.iter()
.enumerate()
.flat_map(|(i, range)| {
// sort like this before reversed so anchor < head later
match (range.anchor < range.head, i == primary) {
(true, true) => [(range.anchor, "#["), (range.head, "|]#")],
(true, false) => [(range.anchor, "#("), (range.head, "|)#")],
(false, true) => [(range.anchor, "]#"), (range.head, "#[|")],
(false, false) => [(range.anchor, ")#"), (range.head, "#(|")],
}
})
.collect();
// insert in reverse order
insertion.sort_unstable_by_key(|k| Reverse(k.0));
for (i, s) in insertion {
out.insert_str(i, s);
}
out
}
|
