error.rs

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//! The error returned when parsing fails

use std::fmt;


/// The reason parsing failed, and where it happened in the original string
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Error {
    /// A description of what happened
    pub message: String,
    /// The character position counted from the start of the original string (starting at 0)
    pub position: usize,
}


impl Error {
    pub fn new(message: impl Into<String>, position: usize) -> Error {
        Error {message: message.into(), position}
    }
}


impl fmt::Display for Error {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        write!(formatter, "{} ({} 文字目)", self.message, self.position + 1)
    }
}


impl std::error::Error for Error {}