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use std::error;
use std::fmt;
use std::fmt::Debug;
use crate::ast::*;
use crate::iter::FilePositioned;
pub enum ErrorType {
TypeFail,
DuplicateBinding,
Unsupported,
NoSuchSymbol,
BadArgLen,
FormatError,
IncludeError,
ReservedWordError,
ParseError,
AssertError,
UserDefined,
}
impl fmt::Display for ErrorType {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
let name = match self {
&ErrorType::TypeFail => "TypeFail",
&ErrorType::DuplicateBinding => "DuplicateBinding",
&ErrorType::Unsupported => "Unsupported",
&ErrorType::NoSuchSymbol => "NoSuchSymbol",
&ErrorType::BadArgLen => "BadArgLen",
&ErrorType::FormatError => "FormatError",
&ErrorType::IncludeError => "IncludeError",
&ErrorType::ReservedWordError => "ReservedWordError",
&ErrorType::ParseError => "ParseError",
&ErrorType::AssertError => "AssertError",
&ErrorType::UserDefined => "UserDefined",
};
w.write_str(name)
}
}
pub struct BuildError {
pub err_type: ErrorType,
pub pos: Option<Position>,
pub msg: String,
pub cause: Option<Box<dyn error::Error>>,
_pkgonly: (),
}
impl BuildError {
pub fn with_pos<S: Into<String>>(msg: S, t: ErrorType, pos: Position) -> Self {
BuildError {
err_type: t,
pos: Some(pos),
msg: msg.into(),
cause: None,
_pkgonly: (),
}
}
pub fn new<S: Into<String>>(msg: S, t: ErrorType) -> Self {
BuildError {
err_type: t,
pos: None,
msg: msg.into(),
cause: None,
_pkgonly: (),
}
}
pub fn wrap_cause(mut self, cause: Box<dyn error::Error>) -> Self {
self.cause = Some(cause);
self
}
pub fn to_boxed(self) -> Box<Self> {
Box::new(self)
}
fn render(&self, w: &mut fmt::Formatter) -> fmt::Result {
if let Some(ref pos) = self.pos {
let file = match pos.file {
Some(ref pb) => pb.to_string_lossy().to_string(),
None => "<eval>".to_string(),
};
write!(
w,
"{}: {} at {} line: {}, column: {}",
self.err_type, self.msg, file, pos.line, pos.column
)?;
} else {
write!(w, "{}: {}", self.err_type, self.msg)?;
}
if let Some(ref cause) = self.cause {
write!(w, "\nCaused By:\n\t{}", cause)?;
}
Ok(())
}
}
impl Debug for BuildError {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
self.render(w)
}
}
impl fmt::Display for BuildError {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
self.render(w)
}
}
impl error::Error for BuildError {
fn description(&self) -> &str {
&self.msg
}
}
#[derive(Debug)]
pub struct StackPrinter<C: FilePositioned> {
pub err: abortable_parser::Error<C>,
}
impl<C: FilePositioned> StackPrinter<C> {
pub fn render(&self, w: &mut fmt::Formatter) -> fmt::Result {
let mut curr_err = Some(&self.err);
let mut tabstop = "";
loop {
match curr_err {
None => break,
Some(err) => {
let context = err.get_context();
let file = match context.file() {
Some(ref pb) => pb.to_string_lossy().to_string(),
None => "<eval>".to_string(),
};
write!(
w,
"{}{}: at {} line: {}, column: {}\n",
tabstop,
err.get_msg(),
file,
context.line(),
context.column(),
)?;
tabstop = "\t";
curr_err = err.get_cause();
if curr_err.is_some() {
write!(w, "Caused by: \n")?;
}
}
}
}
Ok(())
}
}
impl<C: FilePositioned> fmt::Display for StackPrinter<C> {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
self.render(w)
}
}