justcsv 0.2.0

Simple CSV-file reader/writer
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

mod error;
mod parse;
mod reader;
mod writer;

pub use error::{Error, Result};
pub use reader::{CsvReader, CsvReaderConfig};
pub use writer::{CsvWriter, CsvWriterConfig, NewLine};

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn reader_works() {
        let buf = "1,2,3\n4,5,6".as_bytes();
        let mut reader = reader::CsvReader::new(buf);
        assert_eq!(
            vec!["1", "2", "3"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert_eq!(
            vec!["4", "5", "6"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert!(reader.next().is_none())
    }

    #[test]
    fn empty_reader() {
        let buf = "".as_bytes();
        let mut reader = reader::CsvReader::new(buf);
        assert!(dbg!(reader.next()).is_none());
    }

    #[test]
    fn escaped_read() {
        let buf = "\"1\",2,3\r\n4, \"5\",6".as_bytes();
        let mut reader = reader::CsvReader::new(buf);
        assert_eq!(
            vec!["1", "2", "3"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert_eq!(
            vec!["4", "5", "6"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert!(reader.next().is_none())
    }

    #[test]
    fn multiline_read() {
        let buf = "\"1\",2,3\r\n4, \"everybody needs\nmilk\",6".as_bytes();
        let mut reader = reader::CsvReader::new(buf);
        assert_eq!(
            vec!["1", "2", "3"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert_eq!(
            vec!["4", "everybody needs\nmilk", "6"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert!(reader.next().is_none())
    }

    #[test]
    fn quoted_read_fail() {
        let buf =
            "\"1\",2,3\r\n4, \"everybody needs\nmilk,6\r\nsome other stuff which is never read"
                .as_bytes();
        let mut reader = reader::CsvReader::new(buf);
        assert_eq!(
            vec!["1", "2", "3"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert!(reader.next().unwrap().is_err());
        assert!(reader.next().is_none())
    }

    #[test]
    fn read_last_line() {
        let buf = "1,2,3\r\n4,5,\r\n".as_bytes();
        let mut reader = reader::CsvReader::new(buf);
        assert_eq!(
            vec!["1", "2", "3"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert_eq!(
            vec!["4", "5", ""],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert!(reader.next().is_none())
    }

    #[test]
    fn read_bad_escaping() {
        let buf = "1,2,3\r\n4,\"5\"xyz,6\r\n\"7\",8,9".as_bytes();
        let mut reader = reader::CsvReader::new(buf);
        assert_eq!(
            vec!["1", "2", "3"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert!(reader.next().unwrap().is_err());
        assert_eq!(
            vec!["7", "8", "9"],
            reader.next().unwrap().unwrap().into_vec()
        )
    }

    #[test]
    fn read_headers() {
        let buf = "Col 1,Col 2, \"Col 3\"\r\n1,2,3\r\n4,\"5\",6".as_bytes();
        let mut reader = reader::CsvReader::with_config(
            buf,
            CsvReaderConfig {
                has_headers: true,
                ..Default::default()
            },
        );
        assert_eq!(
            vec!["Col 1", "Col 2", "Col 3"],
            reader.headers().unwrap().to_vec()
        );
        assert_eq!(
            vec!["1", "2", "3"],
            reader.next().unwrap().unwrap().into_vec()
        );
        assert_eq!(
            vec!["4", "5", "6"],
            reader.next().unwrap().unwrap().into_vec()
        );
    }

    #[test]
    fn writer_works() {
        let mut buf = Vec::new();
        let row = vec!["1", "2", "3"];
        let mut writer = CsvWriter::new(&mut buf);
        writer.write_row(&row).unwrap();
        writer.write_row(["4", "5\"abc\"X", "6\n\tagain"]).unwrap();
        assert_eq!(
            b"1,2,3\r\n4,\"5\"\"abc\"\"X\",\"6\n\tagain\"",
            buf.as_slice()
        );
    }
}