[go: up one dir, main page]

diff 0.1.5

An LCS based slice and string diffing implementation.
Documentation 
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

#![feature(plugin)]
#![plugin(speculate)]

extern crate diff;
extern crate quickcheck;

pub fn undiff<T: Clone>(diff: &[::diff::Result<&T>]) -> (Vec<T>, Vec<T>) {
    let (mut left, mut right) = (vec![], vec![]);
    for d in diff {
        match d {
            &::diff::Result::Left(l) => left.push(l.clone()),
            &::diff::Result::Both(l, r) => {
                left.push(l.clone());
                right.push(r.clone());
            },
            &::diff::Result::Right(r) => right.push(r.clone()),
        }
    }
    (left, right)
}

pub fn undiff_str<'a>(diff: &[::diff::Result<&'a str>])
                      -> (Vec<&'a str>, Vec<&'a str>) {
    let (mut left, mut right) = (vec![], vec![]);
    for d in diff {
        match d {
            &::diff::Result::Left(l) => left.push(l.clone()),
            &::diff::Result::Both(l, r) => {
                left.push(l.clone());
                right.push(r.clone());
            },
            &::diff::Result::Right(r) => right.push(r.clone()),
        }
    }
    (left, right)
}

pub fn undiff_chars<'a>(diff: &[::diff::Result<char>]) -> (String, String) {
    let (mut left, mut right) = (vec![], vec![]);
    for d in diff {
        match d {
            &::diff::Result::Left(l) => left.push(l.clone()),
            &::diff::Result::Both(l, r) => {
                left.push(l.clone());
                right.push(r.clone());
            },
            &::diff::Result::Right(r) => right.push(r.clone()),
        }
    }
    (left.iter().cloned().collect(), right.iter().cloned().collect())
}

speculate! {
    describe "slice" {
        before {
            fn go<T>(left: &[T], right: &[T], len: usize) where
                T: Clone + ::std::fmt::Debug + PartialEq
            {
                let diff = ::diff::slice(&left, &right);
                assert_eq!(diff.len(), len);
                let (left_, right_) = undiff(&diff);
                assert_eq!(left, &left_[..]);
                assert_eq!(right, &right_[..]);
            }
        }

        test "empty slices" {
            let slice: &[()] = &[];
            go(&slice, &slice, 0);
        }

        test "equal + non-empty slices" {
            let slice = [1, 2, 3];
            go(&slice, &slice, 3);
        }

        test "left empty, right non-empty" {
            let slice = [1, 2, 3];
            go(&slice, &[], 3);
        }

        test "left non-empty, right empty" {
            let slice = [1, 2, 3];
            go(&[], &slice, 3);
        }

        test "misc 1" {
            let left = [1, 2, 3, 4, 1, 3];
            let right = [1, 4, 1, 1];
            go(&left, &right, 7);
        }

        test "misc 2" {
            let left = [1, 2, 1, 2, 3, 2, 2, 3, 1, 3];
            let right = [3, 3, 1, 2, 3, 1, 2, 3, 4, 1];
            go(&left, &right, 14);
        }

        test "quickcheck" {
            fn prop(left: Vec<i32>, right: Vec<i32>) -> bool {
                let diff = ::diff::slice(&left, &right);
                let (left_, right_) = undiff(&diff);
                left == &left_[..] && right == &right_[..]
            }

            ::quickcheck::quickcheck(prop as fn(Vec<i32>, Vec<i32>) -> bool);
        }
    }

    describe "lines" {
        before {
            fn go(left: &str, right: &str, len: usize) {
                let diff = ::diff::lines(&left, &right);
                assert_eq!(diff.len(), len);
                let (left_, right_) = undiff_str(&diff);
                assert_eq!(left, left_.join("\n"));
                assert_eq!(right, right_.join("\n"));
            }
        }

        test "both empty" {
            go("", "", 0);
        }

        test "one empty" {
            go("foo", "", 1);
            go("", "foo", 1);
        }

        test "both equal and non-empty" {
            go("foo\nbar", "foo\nbar", 2);
        }

        test "misc 1" {
            go("foo\nbar\nbaz", "foo\nbaz\nquux", 4);
        }
    }

    describe "chars" {
        before {
            fn go(left: &str, right: &str, len: usize) {
                let diff = ::diff::chars(&left, &right);
                assert_eq!(diff.len(), len);
                let (left_, right_) = undiff_chars(&diff);
                assert_eq!(left, left_);
                assert_eq!(right, right_);
            }
        }

        test "both empty" {
            go("", "", 0);
        }

        test "one empty" {
            go("foo", "", 3);
            go("", "foo", 3);
        }

        test "both equal and non-empty" {
            go("foo bar", "foo bar", 7);
        }

        test "misc 1" {
            go("foo bar baz", "foo baz quux", 16);
        }
    }
}