1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 use super::UnicodeSegmentation;
12
13 use std::prelude::v1::*;
14
15 #[test]
test_graphemes()16 fn test_graphemes() {
17 use testdata::{TEST_SAME, TEST_DIFF};
18
19 pub const EXTRA_DIFF: &'static [(&'static str,
20 &'static [&'static str],
21 &'static [&'static str])] = &[
22 // Official test suite doesn't include two Prepend chars between two other chars.
23 ("\u{20}\u{600}\u{600}\u{20}",
24 &["\u{20}", "\u{600}\u{600}\u{20}"],
25 &["\u{20}", "\u{600}", "\u{600}", "\u{20}"]),
26
27 // Test for Prepend followed by two Any chars
28 ("\u{600}\u{20}\u{20}",
29 &["\u{600}\u{20}", "\u{20}"],
30 &["\u{600}", "\u{20}", "\u{20}"]),
31 ];
32
33 pub const EXTRA_SAME: &'static [(&'static str, &'static [&'static str])] = &[
34 // family emoji (more than two emoji joined by ZWJ)
35 ("\u{1f468}\u{200d}\u{1f467}\u{200d}\u{1f466}",
36 &["\u{1f468}\u{200d}\u{1f467}\u{200d}\u{1f466}"]),
37 ];
38
39 for &(s, g) in TEST_SAME.iter().chain(EXTRA_SAME) {
40 // test forward iterator
41 assert!(UnicodeSegmentation::graphemes(s, true).eq(g.iter().cloned()));
42 assert!(UnicodeSegmentation::graphemes(s, false).eq(g.iter().cloned()));
43
44 // test reverse iterator
45 assert!(UnicodeSegmentation::graphemes(s, true).rev().eq(g.iter().rev().cloned()));
46 assert!(UnicodeSegmentation::graphemes(s, false).rev().eq(g.iter().rev().cloned()));
47 }
48
49 for &(s, gt, gf) in TEST_DIFF.iter().chain(EXTRA_DIFF) {
50 // test forward iterator
51 assert!(UnicodeSegmentation::graphemes(s, true).eq(gt.iter().cloned()));
52 assert!(UnicodeSegmentation::graphemes(s, false).eq(gf.iter().cloned()));
53
54 // test reverse iterator
55 assert!(UnicodeSegmentation::graphemes(s, true).rev().eq(gt.iter().rev().cloned()));
56 assert!(UnicodeSegmentation::graphemes(s, false).rev().eq(gf.iter().rev().cloned()));
57 }
58
59 // test the indices iterators
60 let s = "a̐éö̲\r\n";
61 let gr_inds = UnicodeSegmentation::grapheme_indices(s, true).collect::<Vec<(usize, &str)>>();
62 let b: &[_] = &[(0, "a̐"), (3, "é"), (6, "ö̲"), (11, "\r\n")];
63 assert_eq!(gr_inds, b);
64 let gr_inds = UnicodeSegmentation::grapheme_indices(s, true).rev().collect::<Vec<(usize, &str)>>();
65 let b: &[_] = &[(11, "\r\n"), (6, "ö̲"), (3, "é"), (0, "a̐")];
66 assert_eq!(gr_inds, b);
67 let mut gr_inds_iter = UnicodeSegmentation::grapheme_indices(s, true);
68 {
69 let gr_inds = gr_inds_iter.by_ref();
70 let e1 = gr_inds.size_hint();
71 assert_eq!(e1, (1, Some(13)));
72 let c = gr_inds.count();
73 assert_eq!(c, 4);
74 }
75 let e2 = gr_inds_iter.size_hint();
76 assert_eq!(e2, (0, Some(0)));
77
78 // make sure the reverse iterator does the right thing with "\n" at beginning of string
79 let s = "\n\r\n\r";
80 let gr = UnicodeSegmentation::graphemes(s, true).rev().collect::<Vec<&str>>();
81 let b: &[_] = &["\r", "\r\n", "\n"];
82 assert_eq!(gr, b);
83 }
84
85 #[test]
test_words()86 fn test_words() {
87 use testdata::TEST_WORD;
88
89 // Unicode's official tests don't really test longer chains of flag emoji
90 // TODO This could be improved with more tests like flag emoji with interspersed Extend chars and ZWJ
91 const EXTRA_TESTS: &'static [(&'static str, &'static [&'static str])] = &[
92 ("", &["", "", "", "", "", "", ""]),
93 ("", &["", "", "", "", "", "", ""]),
94 ("aa", &["", "a", "", "", "a", "", "", "", "", ""]),
95 ("\u{1f468}\u{200d}\u{1f468}\u{200d}\u{1f466}", &["\u{1f468}\u{200d}\u{1f468}\u{200d}\u{1f466}"]),
96 ("", &["", ""]),
97 // perhaps wrong, spaces should not be included?
98 ("hello world", &["hello", " ", "world"]),
99 (" hi", &["", "", "", "", " ", "hi"]),
100 ];
101 for &(s, w) in TEST_WORD.iter().chain(EXTRA_TESTS.iter()) {
102 macro_rules! assert_ {
103 ($test:expr, $exp:expr, $name:expr) => {
104 // collect into vector for better diagnostics in failure case
105 let testing = $test.collect::<Vec<_>>();
106 let expected = $exp.collect::<Vec<_>>();
107 assert_eq!(testing, expected, "{} test for testcase ({:?}, {:?}) failed.", $name, s, w)
108 }
109 }
110 // test forward iterator
111 assert_!(s.split_word_bounds(),
112 w.iter().cloned(),
113 "Forward word boundaries");
114
115 // test reverse iterator
116 assert_!(s.split_word_bounds().rev(),
117 w.iter().rev().cloned(),
118 "Reverse word boundaries");
119
120 // generate offsets from word string lengths
121 let mut indices = vec![0];
122 for i in w.iter().cloned().map(|s| s.len()).scan(0, |t, n| { *t += n; Some(*t) }) {
123 indices.push(i);
124 }
125 indices.pop();
126 let indices = indices;
127
128 // test forward indices iterator
129 assert_!(s.split_word_bound_indices().map(|(l,_)| l),
130 indices.iter().cloned(),
131 "Forward word indices");
132
133 // test backward indices iterator
134 assert_!(s.split_word_bound_indices().rev().map(|(l,_)| l),
135 indices.iter().rev().cloned(),
136 "Reverse word indices");
137 }
138 }
139
140 quickcheck! {
141 fn quickcheck_forward_reverse_graphemes_extended(s: String) -> bool {
142 let a = s.graphemes(true).collect::<Vec<_>>();
143 let mut b = s.graphemes(true).rev().collect::<Vec<_>>();
144 b.reverse();
145 a == b
146 }
147
148 fn quickcheck_forward_reverse_graphemes_legacy(s: String) -> bool {
149 let a = s.graphemes(false).collect::<Vec<_>>();
150 let mut b = s.graphemes(false).rev().collect::<Vec<_>>();
151 b.reverse();
152 a == b
153 }
154
155 fn quickcheck_join_graphemes(s: String) -> bool {
156 let a = s.graphemes(true).collect::<String>();
157 let b = s.graphemes(false).collect::<String>();
158 a == s && b == s
159 }
160
161 fn quickcheck_forward_reverse_words(s: String) -> bool {
162 let a = s.split_word_bounds().collect::<Vec<_>>();
163 let mut b = s.split_word_bounds().rev().collect::<Vec<_>>();
164 b.reverse();
165 a == b
166 }
167
168 fn quickcheck_join_words(s: String) -> bool {
169 let a = s.split_word_bounds().collect::<String>();
170 a == s
171 }
172 }
173