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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
use crate::*;
use alloc::string::String;
use alloc::vec::Vec;
pub(crate) struct TestWriter {
pub(crate) string: String,
pub(crate) parts: Vec<(usize, usize, Part)>,
}
impl TestWriter {
pub(crate) fn finish(mut self) -> (String, Vec<(usize, usize, Part)>) {
// Sort by first open and last closed
self.parts
.sort_unstable_by_key(|(begin, end, _)| (*begin, end.wrapping_neg()));
(self.string, self.parts)
}
}
impl fmt::Write for TestWriter {
fn write_str(&mut self, s: &str) -> fmt::Result {
self.string.write_str(s)
}
fn write_char(&mut self, c: char) -> fmt::Result {
self.string.write_char(c)
}
}
impl PartsWrite for TestWriter {
type SubPartsWrite = Self;
fn with_part(
&mut self,
part: Part,
mut f: impl FnMut(&mut Self::SubPartsWrite) -> fmt::Result,
) -> fmt::Result {
let start = self.string.len();
f(self)?;
let end = self.string.len();
if start < end {
self.parts.push((start, end, part));
}
Ok(())
}
}
#[allow(clippy::type_complexity)]
pub fn writeable_to_parts_for_test<W: Writeable>(
writeable: &W,
) -> (String, Vec<(usize, usize, Part)>) {
let mut writer = TestWriter {
string: alloc::string::String::new(),
parts: Vec::new(),
};
#[allow(clippy::expect_used)] // for test code
writeable
.write_to_parts(&mut writer)
.expect("String writer infallible");
writer.finish()
}
#[allow(clippy::type_complexity)]
pub fn try_writeable_to_parts_for_test<W: TryWriteable>(
writeable: &W,
) -> (String, Vec<(usize, usize, Part)>, Option<W::Error>) {
let mut writer = TestWriter {
string: alloc::string::String::new(),
parts: Vec::new(),
};
#[allow(clippy::expect_used)] // for test code
let result = writeable
.try_write_to_parts(&mut writer)
.expect("String writer infallible");
let (actual_str, actual_parts) = writer.finish();
(actual_str, actual_parts, result.err())
}