rrdbc 0.2.1

dbc parser
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

use std::fmt;

use nom::bytes::complete::tag;
use nom::character::complete::{line_ending, u32};
use nom::combinator::map;
use nom::multi::many0;
use nom::{IResult, Parser};

use super::common_parsers::{multispacey, parser_env_var_name, spacey};
use super::error::DbcParseError;

/// Environment variables data section
///
/// ```text
/// environment_variables_data = environment_variable_data ;
/// environment_variable_data = 'ENVVAR_DATA_' env_var_name ':' data_size ';' ;
/// data_size = unsigned_integer ;
/// ```
///
/// example:
///
/// ```text
/// ENVVAR_DATA_ RWEnvVar_wData: 10;
/// ```
#[derive(PartialEq, Debug, Clone)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct EnvironmentVariableData {
    pub env_var_name: String,
    pub data_size: u32,
}

impl fmt::Display for EnvironmentVariableData {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "ENVVAR_DATA_ {}: {};", self.env_var_name, self.data_size)
    }
}

fn parser_data_size(input: &str) -> IResult<&str, u32, DbcParseError> {
    u32.parse(input)
}

pub fn parser_env_var_data(input: &str) -> IResult<&str, EnvironmentVariableData, DbcParseError> {
    let res = map(
        (
            multispacey(tag("ENVVAR_DATA_")),
            spacey(parser_env_var_name),
            spacey(tag(":")),
            spacey(parser_data_size),
            spacey(tag(";")),
            many0(line_ending),
        ),
        |(_, env_var_name, _, data_size, _, _)| EnvironmentVariableData {
            env_var_name: env_var_name.to_string(),
            data_size,
        },
    )
    .parse(input);

    match res {
        Ok((remain, val)) => Ok((remain, val)),
        Err(e) => {
            log::trace!("parse environment variable data failed, e = {e:?}");
            Err(nom::Err::Error(DbcParseError::BadEnvironmentVariableData))
        }
    }
}

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

    #[test]
    fn test_environment_variable_data_string_01() {
        assert_eq!(
            EnvironmentVariableData {
                env_var_name: "RWEnvVar_wData".to_string(),
                data_size: 10
            }
            .to_string(),
            "ENVVAR_DATA_ RWEnvVar_wData: 10;"
        );
    }

    #[test]
    fn test_parser_environment_variable_data_01() {
        assert_eq!(
            parser_env_var_data("ENVVAR_DATA_ RWEnvVar_wData: 10;"),
            Ok((
                "",
                EnvironmentVariableData {
                    env_var_name: "RWEnvVar_wData".to_string(),
                    data_size: 10
                }
            ))
        );
    }
}