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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use quickcheck::quickcheck;
use unicode_segmentation::UnicodeSegmentation;
#[rustfmt::skip]
mod testdata;
#[test]
fn test_graphemes() {
use crate::testdata::{TEST_DIFF, TEST_SAME};
pub const EXTRA_DIFF: &[(&str, &[&str], &[&str])] = &[
// Official test suite doesn't include two Prepend chars between two other chars.
(
"\u{20}\u{600}\u{600}\u{20}",
&["\u{20}", "\u{600}\u{600}\u{20}"],
&["\u{20}", "\u{600}", "\u{600}", "\u{20}"],
),
// Test for Prepend followed by two Any chars
(
"\u{600}\u{20}\u{20}",
&["\u{600}\u{20}", "\u{20}"],
&["\u{600}", "\u{20}", "\u{20}"],
),
];
pub const EXTRA_SAME: &[(&str, &[&str])] = &[
// family emoji (more than two emoji joined by ZWJ)
(
"\u{1f468}\u{200d}\u{1f467}\u{200d}\u{1f466}",
&["\u{1f468}\u{200d}\u{1f467}\u{200d}\u{1f466}"],
),
// cartwheel emoji followed by two fitzpatrick skin tone modifiers
// (test case from issue #19)
(
"\u{1F938}\u{1F3FE}\u{1F3FE}",
&["\u{1F938}\u{1F3FE}\u{1F3FE}"],
),
];
for &(s, g) in TEST_SAME.iter().chain(EXTRA_SAME) {
// test forward iterator
let our_extended: Vec<_> = UnicodeSegmentation::graphemes(s, true).collect();
let our_legacy: Vec<_> = UnicodeSegmentation::graphemes(s, false).collect();
assert_eq!(our_extended, g, "{s:?} extended");
assert_eq!(our_legacy, g, "{s:?} legacy");
// test reverse iterator
assert!(UnicodeSegmentation::graphemes(s, true)
.rev()
.eq(g.iter().rev().cloned()));
assert!(UnicodeSegmentation::graphemes(s, false)
.rev()
.eq(g.iter().rev().cloned()));
}
for &(s, gt, gf) in TEST_DIFF.iter().chain(EXTRA_DIFF) {
// test forward iterator
assert!(UnicodeSegmentation::graphemes(s, true).eq(gt.iter().cloned()));
assert!(UnicodeSegmentation::graphemes(s, false).eq(gf.iter().cloned()));
// test reverse iterator
assert!(UnicodeSegmentation::graphemes(s, true)
.rev()
.eq(gt.iter().rev().cloned()));
assert!(UnicodeSegmentation::graphemes(s, false)
.rev()
.eq(gf.iter().rev().cloned()));
}
// test the indices iterators
let s = "a̐éö̲\r\n";
let gr_inds = UnicodeSegmentation::grapheme_indices(s, true).collect::<Vec<(usize, &str)>>();
let b: &[_] = &[(0, "a̐"), (3, "é"), (6, "ö̲"), (11, "\r\n")];
assert_eq!(gr_inds, b);
let gr_inds = UnicodeSegmentation::grapheme_indices(s, true)
.rev()
.collect::<Vec<(usize, &str)>>();
let b: &[_] = &[(11, "\r\n"), (6, "ö̲"), (3, "é"), (0, "a̐")];
assert_eq!(gr_inds, b);
let mut gr_inds_iter = UnicodeSegmentation::grapheme_indices(s, true);
{
let gr_inds = gr_inds_iter.by_ref();
let e1 = gr_inds.size_hint();
assert_eq!(e1, (1, Some(13)));
let c = gr_inds.count();
assert_eq!(c, 4);
}
let e2 = gr_inds_iter.size_hint();
assert_eq!(e2, (0, Some(0)));
// make sure the reverse iterator does the right thing with "\n" at beginning of string
let s = "\n\r\n\r";
let gr = UnicodeSegmentation::graphemes(s, true)
.rev()
.collect::<Vec<&str>>();
let b: &[_] = &["\r", "\r\n", "\n"];
assert_eq!(gr, b);
}
#[test]
fn test_words() {
use crate::testdata::TEST_WORD;
// Unicode's official tests don't really test longer chains of flag emoji
// TODO This could be improved with more tests like flag emoji with interspersed Extend chars and ZWJ
const EXTRA_TESTS: &[(&str, &[&str])] = &[
(
"🇦🇫🇦🇽🇦🇱🇩🇿🇦🇸🇦🇩🇦🇴",
&["🇦🇫", "🇦🇽", "🇦🇱", "🇩🇿", "🇦🇸", "🇦🇩", "🇦🇴"],
),
("🇦🇫🇦🇽🇦🇱🇩🇿🇦🇸🇦🇩🇦", &["🇦🇫", "🇦🇽", "🇦🇱", "🇩🇿", "🇦🇸", "🇦🇩", "🇦"]),
(
"🇦a🇫🇦🇽a🇦🇱🇩🇿🇦🇸🇦🇩🇦",
&["🇦", "a", "🇫🇦", "🇽", "a", "🇦🇱", "🇩🇿", "🇦🇸", "🇦🇩", "🇦"],
),
(
"\u{1f468}\u{200d}\u{1f468}\u{200d}\u{1f466}",
&["\u{1f468}\u{200d}\u{1f468}\u{200d}\u{1f466}"],
),
("😌👎🏼", &["😌", "👎🏼"]),
// perhaps wrong, spaces should not be included?
("hello world", &["hello", " ", "world"]),
("🇨🇦🇨🇭🇿🇲🇿 hi", &["🇨🇦", "🇨🇭", "🇿🇲", "🇿", " ", "hi"]),
];
for &(s, w) in TEST_WORD.iter().chain(EXTRA_TESTS.iter()) {
macro_rules! assert_ {
($test:expr, $exp:expr, $name:expr) => {
// collect into vector for better diagnostics in failure case
let testing = $test.collect::<Vec<_>>();
let expected = $exp.collect::<Vec<_>>();
assert_eq!(
testing, expected,
"{} test for testcase ({:?}, {:?}) failed.",
$name, s, w
)
};
}
// test forward iterator
assert_!(
s.split_word_bounds(),
w.iter().cloned(),
"Forward word boundaries"
);
// test reverse iterator
assert_!(
s.split_word_bounds().rev(),
w.iter().rev().cloned(),
"Reverse word boundaries"
);
// generate offsets from word string lengths
let mut indices = vec![0];
for i in w.iter().cloned().map(|s| s.len()).scan(0, |t, n| {
*t += n;
Some(*t)
}) {
indices.push(i);
}
indices.pop();
let indices = indices;
// test forward indices iterator
assert_!(
s.split_word_bound_indices().map(|(l, _)| l),
indices.iter().cloned(),
"Forward word indices"
);
// test backward indices iterator
assert_!(
s.split_word_bound_indices().rev().map(|(l, _)| l),
indices.iter().rev().cloned(),
"Reverse word indices"
);
}
}
#[test]
fn test_sentences() {
use crate::testdata::TEST_SENTENCE;
for &(s, w) in TEST_SENTENCE.iter() {
macro_rules! assert_ {
($test:expr, $exp:expr, $name:expr) => {
// collect into vector for better diagnostics in failure case
let testing = $test.collect::<Vec<_>>();
let expected = $exp.collect::<Vec<_>>();
assert_eq!(
testing, expected,
"{} test for testcase ({:?}, {:?}) failed.",
$name, s, w
)
};
}
assert_!(
s.split_sentence_bounds(),
w.iter().cloned(),
"Forward sentence boundaries"
);
}
}
quickcheck! {
fn quickcheck_forward_reverse_graphemes_extended(s: String) -> bool {
let a = s.graphemes(true).collect::<Vec<_>>();
let mut b = s.graphemes(true).rev().collect::<Vec<_>>();
b.reverse();
a == b
}
fn quickcheck_forward_reverse_graphemes_legacy(s: String) -> bool {
let a = s.graphemes(false).collect::<Vec<_>>();
let mut b = s.graphemes(false).rev().collect::<Vec<_>>();
b.reverse();
a == b
}
fn quickcheck_join_graphemes(s: String) -> bool {
let a = s.graphemes(true).collect::<String>();
let b = s.graphemes(false).collect::<String>();
a == s && b == s
}
fn quickcheck_forward_reverse_words(s: String) -> bool {
let a = s.split_word_bounds().collect::<Vec<_>>();
let mut b = s.split_word_bounds().rev().collect::<Vec<_>>();
b.reverse();
a == b
}
fn quickcheck_join_words(s: String) -> bool {
let a = s.split_word_bounds().collect::<String>();
a == s
}
}
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