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use crate::lexer::Span;
use crate::parse::ScriptToken;
use std::error::Error;
use std::fmt::{Display, Formatter};
#[derive(Debug)]
pub enum TokenErrorKind<'a> {
Incomplete,
NomError(nom::error::Error<Span<'a>>),
}
#[derive(Debug)]
pub struct TokenError<'a> {
pub kind: TokenErrorKind<'a>,
}
impl<'a> From<TokenErrorKind<'a>> for TokenError<'a> {
fn from(value: TokenErrorKind<'a>) -> Self {
TokenError { kind: value }
}
}
impl<'a> Display for TokenError<'a> {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match &self.kind {
TokenErrorKind::Incomplete => write!(f, "Incomplete Program"),
TokenErrorKind::NomError(err) => write!(f, "{}", err),
}
}
}
impl<'a> Error for TokenError<'a> {}
impl<'a> From<nom::Err<nom::error::Error<Span<'a>>>> for TokenError<'a> {
fn from(value: nom::Err<nom::error::Error<Span<'a>>>) -> Self {
match value {
nom::Err::Error(err) => TokenErrorKind::NomError(err).into(),
nom::Err::Failure(err) => TokenErrorKind::NomError(err).into(),
nom::Err::Incomplete(_) => TokenErrorKind::Incomplete.into(),
}
}
}
#[derive(Clone, Debug)]
pub enum ParseErrorKind<'a> {
Unexpected {
found: ScriptToken<'a>,
expected: peg::error::ExpectedSet,
},
}
#[derive(Clone, Debug)]
pub struct ParseError<'a> {
pub kind: ParseErrorKind<'a>,
}
#[derive(Debug)]
pub enum ForgeErrorKind<'a> {
IncompleteInput,
LexerError(nom::error::Error<Span<'a>>),
UnexpectedToken {
found: ScriptToken<'a>,
expected: peg::error::ExpectedSet,
},
}
#[derive(Debug)]
pub struct ForgeError<'a> {
pub kind: ForgeErrorKind<'a>,
}
impl<'a> From<ParseError<'a>> for ForgeError<'a> {
fn from(value: ParseError<'a>) -> Self {
match value.kind {
ParseErrorKind::Unexpected { found, expected } => ForgeError {
kind: ForgeErrorKind::UnexpectedToken { found, expected },
},
}
}
}
impl<'a> From<TokenError<'a>> for ForgeError<'a> {
fn from(value: TokenError<'a>) -> Self {
match value.kind {
TokenErrorKind::Incomplete => ForgeError {
kind: ForgeErrorKind::IncompleteInput,
},
TokenErrorKind::NomError(span) => ForgeError {
kind: ForgeErrorKind::LexerError(span),
},
}
}
}
pub type ForgeResult<'a, T> = Result<T, ForgeError<'a>>;
pub fn print_unexpected_token<'a>(
source: &'a str,
token: &'a ScriptToken<'a>,
expected: &'a peg::error::ExpectedSet,
) {
let line = token.position.location_line() as usize;
let column = token.position.get_column();
let previous_line = if line > 1 {
source.lines().nth(line - 2)
} else {
None
};
let source_line = source.lines().nth(line - 1).expect("Missing line");
let next_line = source.lines().nth(line);
let largest_line_num = line.max(line.saturating_sub(1)).max(line.saturating_add(1));
let number_length = format!("{}", largest_line_num).len();
eprintln!("| Script error on line {} at \"{}\"\n|", line, token);
if let Some(prev) = previous_line {
eprintln!("| [{:>width$}] {}", line - 1, prev, width = number_length);
}
eprintln!(
"| [{:>width$}] {}",
line,
source_line,
width = number_length
);
eprintln!(
"| {} {}{}",
vec![" "; number_length + 2].join(""),
vec![" "; column - 1].join(""),
vec!["^"; token.token_type.len()].join(""),
);
if let Some(next) = next_line {
eprintln!("| [{:>width$}] {}", line + 1, next, width = number_length);
}
eprintln!("|\n| Failed To Parse: expected {}", expected);
}
pub fn print_forge_error<'a>(source: &'a str, fe: &'a ForgeError) {
match &fe.kind {
ForgeErrorKind::IncompleteInput => eprintln!("| Unexpected end of file"),
ForgeErrorKind::LexerError(err) => eprintln!("| {}", err),
ForgeErrorKind::UnexpectedToken { found, expected } => {
print_unexpected_token(source, found, expected)
}
}
}