bladeink 1.2.2

This is a Rust port of inkle's ink, a scripting language for writing interactive narrative.
Documentation 
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//! Errors that happen at runtime, when running a [`Story`](crate::story::Story).
use core::fmt;

/// Error that represents an error when running a [`Story`](crate::story::Story) at runtime.
/// An error of this type typically means there's
/// a bug in your ink, rather than in the ink engine itself!
#[derive(Debug)]
pub enum StoryError {
    /// Story is in an invalid state.
    InvalidStoryState(String),
    /// JSON for the ink was not valid.
    BadJson(String),
    /// A method was called with an inappropriate argument.
    BadArgument(String),
}

impl StoryError {
    pub(crate) fn get_message(&self) -> &str {
        match self {
            StoryError::InvalidStoryState(msg)
            | StoryError::BadJson(msg)
            | StoryError::BadArgument(msg) => msg.as_str(),
        }
    }
}

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

impl std::convert::From<std::io::Error> for StoryError {
    fn from(err: std::io::Error) -> StoryError {
        StoryError::BadJson(err.to_string())
    }
}

impl fmt::Display for StoryError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            StoryError::InvalidStoryState(desc) => write!(f, "Invalid story state: {}", desc),
            StoryError::BadJson(desc) => write!(f, "Error parsing JSON: {}", desc),
            StoryError::BadArgument(arg) => write!(f, "Bad argument: {}", arg),
        }
    }
}