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use std::fmt;
use crate::{TextRange, TextUnit};
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct SyntaxError {
kind: SyntaxErrorKind,
location: Location,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Location {
Offset(TextUnit),
Range(TextRange),
}
impl Into<Location> for TextUnit {
fn into(self) -> Location {
Location::Offset(self)
}
}
impl Into<Location> for TextRange {
fn into(self) -> Location {
Location::Range(self)
}
}
impl SyntaxError {
pub fn new<L: Into<Location>>(kind: SyntaxErrorKind, loc: L) -> SyntaxError {
SyntaxError { kind, location: loc.into() }
}
pub fn location(&self) -> Location {
self.location.clone()
}
pub fn offset(&self) -> TextUnit {
match self.location {
Location::Offset(offset) => offset,
Location::Range(range) => range.start(),
}
}
pub fn add_offset(mut self, plus_offset: TextUnit) -> SyntaxError {
self.location = match self.location {
Location::Range(range) => Location::Range(range + plus_offset),
Location::Offset(offset) => Location::Offset(offset + plus_offset)
};
self
}
}
impl fmt::Display for SyntaxError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.kind.fmt(f)
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum SyntaxErrorKind {
ParseError(ParseError),
EmptyChar,
UnclosedChar,
LongChar,
EmptyAsciiEscape,
InvalidAsciiEscape,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct ParseError(pub String);
impl fmt::Display for SyntaxErrorKind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::SyntaxErrorKind::*;
match self {
EmptyAsciiEscape => write!(f, "Empty escape sequence"),
InvalidAsciiEscape => write!(f, "Invalid escape sequence"),
EmptyChar => write!(f, "Empty char literal"),
UnclosedChar => write!(f, "Unclosed char literal"),
LongChar => write!(f, "Char literal should be one character long"),
ParseError(msg) => write!(f, "{}", msg.0),
}
}
}
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