aboutsummaryrefslogtreecommitdiff
path: root/helix-core/src/test.rs
blob: 17523ed76107663c6174c929cea364e3cd0af934 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
//! 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.chars().count();

        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.chars().count(), start),
                false => (start, left.chars().count()),
            };

            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
}

#[cfg(test)]
#[allow(clippy::module_inception)]
mod test {
    use super::*;

    #[test]
    fn print_single() {
        assert_eq!(
            (String::from("hello"), Selection::single(1, 0)),
            print("#[|h]#ello")
        );
        assert_eq!(
            (String::from("hello"), Selection::single(0, 1)),
            print("#[h|]#ello")
        );
        assert_eq!(
            (String::from("hello"), Selection::single(4, 0)),
            print("#[|hell]#o")
        );
        assert_eq!(
            (String::from("hello"), Selection::single(0, 4)),
            print("#[hell|]#o")
        );
        assert_eq!(
            (String::from("hello"), Selection::single(5, 0)),
            print("#[|hello]#")
        );
        assert_eq!(
            (String::from("hello"), Selection::single(0, 5)),
            print("#[hello|]#")
        );
    }

    #[test]
    fn print_multi() {
        assert_eq!(
            (
                String::from("hello"),
                Selection::new(
                    SmallVec::from_slice(&[Range::new(1, 0), Range::new(5, 4)]),
                    0
                )
            ),
            print("#[|h]#ell#(|o)#")
        );
        assert_eq!(
            (
                String::from("hello"),
                Selection::new(
                    SmallVec::from_slice(&[Range::new(0, 1), Range::new(4, 5)]),
                    0
                )
            ),
            print("#[h|]#ell#(o|)#")
        );
        assert_eq!(
            (
                String::from("hello"),
                Selection::new(
                    SmallVec::from_slice(&[Range::new(2, 0), Range::new(5, 3)]),
                    0
                )
            ),
            print("#[|he]#l#(|lo)#")
        );
        assert_eq!(
            (
                String::from("hello\r\nhello\r\nhello\r\n"),
                Selection::new(
                    SmallVec::from_slice(&[
                        Range::new(7, 5),
                        Range::new(21, 19),
                        Range::new(14, 12)
                    ]),
                    0
                )
            ),
            print("hello#[|\r\n]#hello#(|\r\n)#hello#(|\r\n)#")
        );
    }

    #[test]
    fn print_multi_byte_code_point() {
        assert_eq!(
            (String::from("„“"), Selection::single(1, 0)),
            print("#[|„]#“")
        );
        assert_eq!(
            (String::from("„“"), Selection::single(2, 1)),
            print("„#[|“]#")
        );
        assert_eq!(
            (String::from("„“"), Selection::single(0, 1)),
            print("#[„|]#“")
        );
        assert_eq!(
            (String::from("„“"), Selection::single(1, 2)),
            print("„#[“|]#")
        );
        assert_eq!(
            (String::from("they said „hello“"), Selection::single(11, 10)),
            print("they said #[|„]#hello“")
        );
    }

    #[test]
    fn print_multi_code_point_grapheme() {
        assert_eq!(
            (
                String::from("hello 👨‍👩‍👧‍👦 goodbye"),
                Selection::single(13, 6)
            ),
            print("hello #[|👨‍👩‍👧‍👦]# goodbye")
        );
    }
}