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use proptest::prelude::*;
use text_unit::{TextUnit, TextRange};
use crate::{AtomTextEdit, TextEdit};
pub fn arb_text() -> proptest::string::RegexGeneratorStrategy<String> {
// generate multiple newlines
proptest::string::string_regex("(.*\n?)*").unwrap()
}
fn text_offsets(text: &str) -> Vec<TextUnit> {
text.char_indices().map(|(i, _)| TextUnit::from_usize(i)).collect()
}
pub fn arb_offset(text: &str) -> BoxedStrategy<TextUnit> {
let offsets = text_offsets(text);
// this is necessary to avoid "Uniform::new called with `low >= high`" panic
if offsets.is_empty() {
Just(TextUnit::from(0)).boxed()
} else {
prop::sample::select(offsets).boxed()
}
}
pub fn arb_text_edit(text: &str) -> BoxedStrategy<TextEdit> {
if text.is_empty() {
// only valid edits
return Just(vec![])
.boxed()
.prop_union(
arb_text()
.prop_map(|text| vec![AtomTextEdit::insert(TextUnit::from(0), text)])
.boxed(),
)
.prop_map(TextEdit::from_atoms)
.boxed();
}
let offsets = text_offsets(text);
let max_cuts = 7.min(offsets.len());
proptest::sample::subsequence(offsets, 0..max_cuts)
.prop_flat_map(|cuts| {
let strategies: Vec<_> = cuts
.chunks(2)
.map(|chunk| match *chunk {
[from, to] => {
let range = TextRange::from_to(from, to);
Just(AtomTextEdit::delete(range))
.boxed()
.prop_union(
arb_text()
.prop_map(move |text| AtomTextEdit::replace(range, text))
.boxed(),
)
.boxed()
}
[x] => arb_text().prop_map(move |text| AtomTextEdit::insert(x, text)).boxed(),
_ => unreachable!(),
})
.collect();
strategies
})
.prop_map(TextEdit::from_atoms)
.boxed()
}
#[derive(Debug, Clone)]
pub struct ArbTextWithEdit {
pub text: String,
pub edit: TextEdit,
}
pub fn arb_text_with_edit() -> BoxedStrategy<ArbTextWithEdit> {
let text = arb_text();
text.prop_flat_map(|s| {
let edit = arb_text_edit(&s);
(Just(s), edit)
})
.prop_map(|(text, edit)| ArbTextWithEdit { text, edit })
.boxed()
}
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