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

use std::error::Error as ErrorTrait;
use std::fmt::{Display, Formatter, Error as FmtError};
use padders::Error as PadderError;
use std::io::Error as IoError;
use self::recognizers::Error as RecognizerError;

pub mod reader;
pub mod writer;
pub mod recognizers;

#[derive(Debug)]
pub enum Error {
    RecordSpecNameRequired,
    RecordSpecRecognizerError(RecognizerError),
    RecordSpecNotFound(String),
    FieldSpecNotFound(String, String),
    PadderFailure(PadderError),
    IoError(IoError),
    StringDoesNotMatchLineEnding(String, String),
    PaddedValueWrongLength(usize, usize),
    FieldValueRequired(String, String)
}

impl ErrorTrait for Error {
    fn description(&self) -> &str {
        match *self {
            Error::RecordSpecNameRequired => "spec name is required since it cannot be recognized",
            Error::RecordSpecRecognizerError(_) => "record spec recognizer encountered an error",
            Error::RecordSpecNotFound(_) => "record spec could not be found",
            Error::FieldSpecNotFound(_, _) => "field spec could not be found",
            Error::PadderFailure(_) => "The un-padder encountered an error",
            Error::IoError(_) => "An IO error occurred while trying to read",
            Error::StringDoesNotMatchLineEnding(_, _) => "The encountered line ending doesn't match the expected one",
            Error::PaddedValueWrongLength(_, _) => "The value returned after padding is either longer or shorter than the length for the field",
            Error::FieldValueRequired(_, _) => "The value for the given field is required since it has no default"
        }
    }

    fn cause(&self) -> Option<&ErrorTrait> {
        match *self {
            Error::RecordSpecRecognizerError(ref e) => Some(e),
            Error::PadderFailure(ref e) => Some(e),
            Error::IoError(ref e) => Some(e),
            _ => None
        }
    }
}

impl Display for Error {
    fn fmt(&self, f: &mut Formatter) -> ::std::result::Result<(), FmtError> {
        match *self {
            Error::RecordSpecNameRequired => write!(f, "spec name is required since it cannot be recognized"),
            Error::RecordSpecRecognizerError(ref e) => write!(f, "record spec recognizer encountered an error: {}", e),
            Error::RecordSpecNotFound(ref name) => write!(f, "record spec named {} could not be found", name),
            Error::FieldSpecNotFound(ref record_name, ref name) => write!(f, "field spec named {} in record spec {} could not be found", name, record_name),
            Error::PadderFailure(ref e) => write!(f, "The un-padder encountered an error: {}", e),
            Error::IoError(ref e) => write!(f, "An IO error occurred while trying to read: {}", e),
            Error::StringDoesNotMatchLineEnding(ref expected, ref actual) => write!(f, "The encountered line ending \"{}\" doesn't match the expected one \"{}\"", actual, expected),
            Error::PaddedValueWrongLength(ref expected, ref actual) => write!(f, "The value returned after padding is {} long and is required to be {} long for the given field", actual, expected),
            Error::FieldValueRequired(ref record_name, ref name) => write!(f, "The value for the field \"{}\" in record spec \"{}\" is required since it has no default", name, record_name)
        }
    }
}

impl From<IoError> for Error {
    fn from(e: IoError) -> Self {
        Error::IoError(e)
    }
}

impl From<RecognizerError> for Error {
    fn from(e: RecognizerError) -> Self {
        match e {
            RecognizerError::CouldNotRecognize => Error::RecordSpecNameRequired,
            _ => Error::RecordSpecRecognizerError(e)
        }
    }
}

impl From<PadderError> for Error {
    fn from(e: PadderError) -> Self {
        Error::PadderFailure(e)
    }
}

type Result<T> = ::std::result::Result<T, Error>;