repl_ng/
error.rs

1use std::convert::From;
2use std::fmt;
3use std::num;
4
5/// Result type
6pub type Result<T> = std::result::Result<T, Error>;
7
8/// Error type
9#[derive(Debug, PartialEq)]
10pub enum Error {
11    /// Parameter is required when it shouldn't be
12    IllegalRequiredError(String),
13
14    /// Parameter is defaulted when it's also required
15    IllegalDefaultError(String),
16
17    /// A required argument is missing
18    MissingRequiredArgument(String, String),
19
20    /// Too many arguments were provided
21    TooManyArguments(String, usize),
22
23    /// Error parsing a bool value
24    ParseBoolError(std::str::ParseBoolError),
25
26    /// Error parsing an int value
27    ParseIntError(num::ParseIntError),
28
29    /// Error parsing a float value
30    ParseFloatError(num::ParseFloatError),
31
32    /// Command not found
33    UnknownCommand(String),
34}
35
36impl std::error::Error for Error {}
37
38impl fmt::Display for Error {
39    fn fmt(&self, f: &mut fmt::Formatter) -> std::result::Result<(), fmt::Error> {
40        match self {
41            Error::IllegalDefaultError(parameter) => {
42                write!(f, "Error: Parameter '{}' cannot have a default", parameter)
43            }
44            Error::IllegalRequiredError(parameter) => {
45                write!(f, "Error: Parameter '{}' cannot be required", parameter)
46            }
47            Error::MissingRequiredArgument(command, parameter) => write!(
48                f,
49                "Error: Missing required argument '{}' for command '{}'",
50                parameter, command
51            ),
52            Error::TooManyArguments(command, nargs) => write!(
53                f,
54                "Error: Command '{}' can have no more than {} arguments",
55                command, nargs,
56            ),
57            Error::ParseBoolError(error) => write!(f, "Error: {}", error,),
58            Error::ParseFloatError(error) => write!(f, "Error: {}", error,),
59            Error::ParseIntError(error) => write!(f, "Error: {}", error,),
60            Error::UnknownCommand(command) => write!(f, "Error: Unknown command '{}'", command),
61        }
62    }
63}
64
65impl From<num::ParseIntError> for Error {
66    fn from(error: num::ParseIntError) -> Self {
67        Error::ParseIntError(error)
68    }
69}
70
71impl From<num::ParseFloatError> for Error {
72    fn from(error: num::ParseFloatError) -> Self {
73        Error::ParseFloatError(error)
74    }
75}
76
77impl From<std::str::ParseBoolError> for Error {
78    fn from(error: std::str::ParseBoolError) -> Self {
79        Error::ParseBoolError(error)
80    }
81}
repl_ng/error.rs

repl_ng/
error.rs
