nodeagg 0.2.0

Expand nodeset expression
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

use crate::expr::{nodeagg_expr, NodeaggExpr};
use crate::iter::NodeaggIterator;
use combine::stream::easy::ParseError;
use combine::stream::PointerOffset;
use combine::EasyParser;
use std::fmt;

#[derive(Debug, Clone)]
pub struct ParseNodeaggError(String);

impl fmt::Display for ParseNodeaggError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}

impl std::error::Error for ParseNodeaggError {
    /// Not supported. Alwyas return None
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        None
    }
}

#[derive(Debug, Clone)]
pub struct Nodeagg(NodeaggExpr);

impl Nodeagg {
    pub fn iter(&self) -> NodeaggIterator<'_> {
        self.0.iter()
    }
}

impl std::str::FromStr for Nodeagg {
    type Err = ParseNodeaggError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match Nodeagg::try_from(s) {
            Ok(x) => Ok(x),
            Err(e) => Err(ParseNodeaggError(format!("{:?}", e))),
        }
    }
}

impl<'a> TryFrom<&'a str> for Nodeagg {
    type Error = ParseError<&'a str>;

    fn try_from(s: &'a str) -> Result<Self, Self::Error> {
        match nodeagg_expr().easy_parse(s) {
            Ok((n, "")) => Ok(Nodeagg(n)),
            Ok((_, input)) => Err(Self::Error {
                position: PointerOffset::new(input.as_ptr() as usize),
                errors: vec![combine::stream::easy::Error::Message(
                    combine::stream::easy::Info::Owned(format!(
                        "string `{}' still exists after parse",
                        input
                    )),
                )],
            }),
            Err(e) => Err(e),
        }
    }
}

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

    #[test]
    fn from_str() {
        assert_eq!(
            Nodeagg::try_from("node1,,node2 ")
                .unwrap()
                .iter()
                .collect::<Vec<_>>(),
            ["node1", "node2"]
        );

        assert_eq!(
            Nodeagg::try_from("node1,,node2\n\n")
                .unwrap()
                .iter()
                .collect::<Vec<_>>(),
            ["node1", "node2"]
        );

        assert_eq!(
            Nodeagg::try_from("node1\nnode2")
                .unwrap()
                .iter()
                .collect::<Vec<_>>(),
            ["node1", "node2"]
        );

        assert_eq!(
            Nodeagg::try_from("node1\n\nnode2")
                .unwrap()
                .iter()
                .collect::<Vec<_>>(),
            ["node1", "node2"]
        );

        assert_eq!(
            Nodeagg::try_from("node1\n\nnode2\n#comment end")
                .unwrap()
                .iter()
                .collect::<Vec<_>>(),
            ["node1", "node2"]
        );

        assert_eq!(
            Nodeagg::try_from("node1\nnode2 #comment\nnode3\n#comment only line\nnode4")
                .unwrap()
                .iter()
                .collect::<Vec<_>>(),
            ["node1", "node2", "node3", "node4"]
        );

        fn f1() -> Nodeagg {
            let a: String = "node[1-2]".to_string();
            Nodeagg::try_from(&a[..]).unwrap()
        }
        assert_eq!(f1().iter().collect::<Vec<_>>(), vec!["node1", "node2"]);

        fn f2(s: &str) -> Nodeagg {
            Nodeagg::try_from(s).unwrap()
        }

        assert_eq!(
            f2("node[01,2]").iter().collect::<Vec<_>>(),
            vec!["node01", "node02"]
        );
    }
}