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use std::fmt;
use std::fs::File;
use std::io::{self, BufRead};
use std::path::PathBuf;
use owo_colors::OwoColorize;
use crate::compiler::Type;
use crate::tokenizer::Token;
use crate::vm::{Op, Value};
#[derive(Debug, Clone)]
pub enum ErrorKind {
TypeError(Op, Vec<Type>),
RuntimeTypeError(Op, Vec<Value>),
Assert,
InvalidProgram,
Unreachable,
SyntaxError(usize, Token),
}
#[derive(Debug, Clone)]
pub struct Error {
pub kind: ErrorKind,
pub file: PathBuf,
pub line: usize,
pub message: Option<String>,
}
impl fmt::Display for ErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ErrorKind::TypeError(op, types) => {
let types = types
.iter()
.fold(String::new(), |a, v| { format!("{}{:?}, ", a, v) });
write!(f, "{} Cannot apply {:?} to types {}", "Type Error".bold(), op, types)
}
ErrorKind::RuntimeTypeError(op, values) => {
let values = values
.iter()
.fold(String::new(), |a, v| { format!("{}{:?}, ", a, v) });
write!(f, "{} Cannot apply {:?} to values {}", "Runtime Type Error".bold(), op, values)
}
ErrorKind::Assert => {
write!(f, "{}", "Assertion failed".bold())
}
ErrorKind::SyntaxError(line, token) => {
write!(f, "{} on line {} at token {:?}", "Syntax Error".bold(), line, token)
}
ErrorKind::Unreachable => {
write!(f, "{}", "Unreachable".bold())
}
ErrorKind::InvalidProgram => {
write!(f, "{}", "[!!] Invalid program [!!]".bold())
}
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let message = match &self.message {
Some(s) => format!("\n{} {}", ">>>".red(), s),
None => String::from(""),
};
let line = if let Ok(file) = File::open(&self.file) {
io::BufReader::new(file).lines().enumerate()
.filter(|(n, _)| self.line-2 <= *n + 1 && *n + 1 <= self.line)
.fold(String::from("\n"), |a, (n, l)| format!("{} {:3} | {}\n", a, (n + 1).blue(), l.unwrap()))
} else {
String::new()
};
write!(f, "\n<{}> {}:{} {}{}{}\n", "ERR".red(), self.file.display().blue(), self.line.blue(), self.kind, message, line)
}
}
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