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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::{Op, Value};
use crate::Type;
use crate::tokenizer::Token;
#[derive(Debug, Clone)]
pub enum ErrorKind {
TypeError(Op, Vec<Type>),
TypeMismatch(Type, Type),
CannotInfer(Type, Type),
ArgumentType(Vec<Type>, Vec<Type>),
IndexError(Value, Type),
/// (External function, parameters)
ExternTypeMismatch(String, Vec<Type>),
ValueError(Op, Vec<Value>),
UnknownField(Value, String),
ArgumentCount(usize, usize),
/// (Indexed value, length, index)
IndexOutOfBounds(Value, usize, usize),
AssertFailed,
InvalidProgram,
Unreachable,
/// (line, token)
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 {}", op, types)
}
ErrorKind::TypeMismatch(a, b) => {
write!(f, "Expected '{:?}' and got '{:?}'.", a, b)
}
ErrorKind::CannotInfer(a, b) => {
write!(f, "Failed to infer type '{:?}' from '{:?}'.", a, b)
}
ErrorKind::ArgumentType(a, b) => {
let expected = a
.iter()
.fold(String::new(), |a, v| { format!("{}{:?}, ", a, v) });
let given = b
.iter()
.fold(String::new(), |a, v| { format!("{}{:?}, ", a, v) });
write!(f, "Argument types do not match, expected [{:?}] but got [{:?}]",
expected, given)
}
ErrorKind::IndexError(value, slot) => {
write!(f, "Cannot index value '{:?}' with type '{:?}'.", value, slot)
}
ErrorKind::ExternTypeMismatch(name, types) => {
write!(f, "Extern function '{}' doesn't accept argument(s) with type(s) {:?}",
name, types)
}
ErrorKind::ValueError(op, values) => {
let values = values
.iter()
.fold(String::new(), |a, v| { format!("{}{:?}, ", a, v) });
write!(f, "Cannot apply {:?} to values {}", op, values)
}
ErrorKind::UnknownField(obj, field) => {
write!(f, "Cannot find field '{}' on {:?}", field, obj)
}
ErrorKind::ArgumentCount(expected, given) => {
write!(f, "Incorrect argument count, expected {} but got {}.",
expected, given)
}
ErrorKind::IndexOutOfBounds(value, len, slot) => {
write!(f, "Failed to index for {:?} - length is {} but index is {}",
value, len, slot)
}
ErrorKind::AssertFailed => {
write!(f, "Assertion failed")
}
ErrorKind::InvalidProgram => {
write!(f, "{}", "[!!] Invalid program [!!]".bold())
}
ErrorKind::Unreachable => {
write!(f, "Reached unreachable code.")
}
ErrorKind::SyntaxError(line, token) => {
write!(f, "Syntax Error on line {} at token {:?}", line, token)
}
}
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let prompt = " ";
let message = match &self.message {
Some(s) => format!("\n{} {}", prompt, s),
None => String::from(""),
};
let line = if let Ok(file) = File::open(&self.file) {
io::BufReader::new(file).lines().enumerate()
.filter(|(n, _)| self.line <= *n + 3 && *n + 3 <= self.line + 2)
.fold(String::from("\n"), |a, (n, l)| format!("{} {:3} | {}\n", a, (n + 1).blue(), l.unwrap()))
} else {
String::new()
};
write!(f, "{} {}:{}\n{} {}{}{}", "ERROR".red(),
self.file.display().blue(), self.line.blue(), prompt, self.kind, message, line)
}
}
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