cuna 0.7.0

A simple cue 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

use std::fmt;
use std::io;
use std::mem::discriminant;
use std::num::ParseIntError;
use thiserror::Error;

#[derive(Debug, Error, PartialEq, Eq, Hash, Copy, Clone)]
pub enum InvalidArgument {
    #[error("Invalid timestamp")]
    InvalidTimestamp,
    #[error("Missing arguments")]
    MissingArgument,
    #[error("Invalid id")]
    InvalidId,
}
#[derive(Debug, Error)]
pub enum ParseError {
    /// There is something wrong in the cue sheet
    #[error("SyntaxError: {0}")]
    SyntaxError(String),
    #[error("UnexpetedToken: {0}")]
    UnexpectedToken(String),
    #[error(transparent)]
    InvalidArgument(#[from] InvalidArgument),
    /// Fails to read a file
    #[error("IoError: {0}")]
    IoError(#[from] io::Error),
}
#[derive(Debug, Error)]
pub struct Error {
    #[source]
    error: ParseError,
    at: Option<usize>,
}

impl ParseError {
    pub fn syntax_error(content: impl fmt::Display, description: impl fmt::Display) -> Self {
        Self::err_msg(format!("{}: {}", content, description))
    }
    pub fn unexpected_token(msg: impl fmt::Display) -> Self {
        Self::UnexpectedToken(msg.to_string())
    }
    pub fn err_msg(msg: impl fmt::Display) -> Self {
        Self::SyntaxError(msg.to_string())
    }
}
impl From<ParseIntError> for ParseError {
    fn from(e: ParseIntError) -> Self {
        Self::err_msg(e)
    }
}
impl PartialEq for ParseError {
    fn eq(&self, other: &Self) -> bool {
        match (self, other) {
            (Self::InvalidArgument(t), Self::InvalidArgument(t2)) => t == t2,
            _ => discriminant(self) == discriminant(other),
        }
    }
}
impl Error {
    pub const fn new(error: ParseError, at: usize) -> Self {
        Self {
            error,
            at: Some(at),
        }
    }
    pub const fn from_parse_error(error: ParseError) -> Self {
        Self { error, at: None }
    }
    pub const fn kind(&self) -> &ParseError {
        &self.error
    }
    pub const fn pos(&self) -> Option<usize> {
        self.at
    }
}
impl fmt::Display for Error {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self.at {
            Some(l) => write!(formatter, "{} at line {}", self.error, l),
            None => write!(formatter, "{}", self.error),
        }
    }
}
impl<E: Into<ParseError>> From<E> for Error {
    fn from(e: E) -> Self {
        Self::from_parse_error(e.into())
    }
}
impl PartialEq for Error {
    fn eq(&self, other: &Self) -> bool {
        self.kind() == other.kind()
    }
}