notedown_ast 0.12.5

notedown ast and converter
Documentation 
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use lsp_types::Url;
use std::{
    error::Error,
    fmt::{self, Debug, Display, Formatter},
};

mod error_custom;

pub type Result<T> = std::result::Result<T, NoteError>;

#[derive(Debug)]
pub struct NoteError {
    kind: Box<NoteErrorKind>,
    file: Option<Url>,
    range: (u32, u32),
}

#[derive(Debug)]
pub enum NoteErrorKind {
    IOError(std::io::Error),
    FormatError {},
    // PestError { #[from] source: pest::error::Error<crate::cst::Rule> },
    LanguageError(String),
    StructureError(String),
    UnexpectedToken(String),
    TypeMismatch(String),
    RuntimeError(String),
    /// A forbidden cst_node encountered
    Unreachable,
    /* #[error(transparent)]
     * UnknownError(#[from] anyhow::Error), */
}

impl NoteError {
    pub fn set_url(self, url: Url) -> Self {
        Self { kind: self.kind, file: Some(url), range: self.range }
    }
    pub fn set_range(self, range: (u32, u32)) -> Self {
        Self { kind: self.kind, file: self.file, range }
    }
    pub fn unreachable() -> Self {
        Self { kind: Box::new(NoteErrorKind::Unreachable), file: None, range: (0, 0) }
    }

    // pub fn structure_error(msg: impl Into<String>, start: Option<usize>, end: Option<usize>) -> NoteError {
    //     Self::StructureError { error: msg.into(), start, end }
    // }
    // ///
    // pub fn unexpected_token(msg: impl Into<String>, start: Option<usize>, end: Option<usize>) -> NoteError {
    //     Self::UnexpectedToken { error: msg.into(), start, end }
    // }
    // ///
    // pub fn language_error(msg: impl Into<String>) -> NoteError {
    //     Self::LanguageError { error: msg.into() }
    // }
    ///
    pub fn type_mismatch(msg: impl Into<String>) -> NoteError {
        let kind = NoteErrorKind::TypeMismatch(msg.into());
        Self { kind: Box::new(kind), file: None, range: (0, 0) }
    }
    ///
    pub fn runtime_error(msg: impl Into<String>) -> NoteError {
        let kind = NoteErrorKind::RuntimeError(msg.into());
        Self { kind: Box::new(kind), file: None, range: (0, 0) }
    }
}

impl Error for NoteError {}

impl Display for NoteError {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        let path = match &self.file {
            Some(s) => s.path(),
            None => "<Anonymous>",
        };
        writeln!(f, "at ({}, {}) of {}", self.range.0, self.range.1, path)?;
        write!(f, "{:indent$}{}", "", self.kind, indent = 4)
    }
}

impl Display for NoteErrorKind {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        match self {
            Self::IOError { .. } => {
                unimplemented!()
            }
            Self::FormatError { .. } => {
                unimplemented!()
            }
            Self::LanguageError(_) => {
                unimplemented!()
            }
            Self::StructureError(_) => {
                unimplemented!()
            }
            Self::UnexpectedToken(_) => {
                unimplemented!()
            }
            Self::TypeMismatch(msg) => {
                f.write_str("TypeMismatch: ")?;
                f.write_str(msg)
            }
            Self::RuntimeError(_) => {
                unimplemented!()
            }
            Self::Unreachable => {
                f.write_str("InternalError: ")?;
                f.write_str("Entered unreachable code!")
            }
        }
    }
}