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// Copyright (c) 2021 Soni L.
//
// Licensed under the MIT license.
// Documentation and comments licensed under CC BY-SA 4.0.
use ::std::marker::PhantomData;
use ::iosonism::strcursor::ReadError;
use ::iosonism::strcursor::StringReader;
/// An error callback.
pub trait ErrorFunc<'a, C: StringReader<'a>> {
fn call<'b>(context: &C, ty: ErrorType<'b>);
}
/// An implementation of various Iosonism errors that calls T.
pub struct ErrorCall<T>(PhantomData<T>);
#[non_exhaustive]
#[derive(PartialEq, Eq, Debug)]
pub enum ErrorType<'a> {
InvalidInteger(&'a str),
ExpectedInteger,
InvalidFloat(&'a str),
ExpectedFloat,
InvalidBool(&'a str),
ExpectedBool,
ExpectedStartOfQuote,
ExpectedEndOfQuote,
InvalidEscape(&'a str),
ExpectedSymbol(&'a str),
}
impl<T> ::std::fmt::Display for ErrorCall<T> {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
write!(f, "error!")
}
}
impl<T> ::std::fmt::Debug for ErrorCall<T> {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
write!(f, "ErrorCall")
}
}
impl<T> ::std::error::Error for ErrorCall<T> {
}
impl<'a, C: StringReader<'a>, T> ReadError<'a, C> for ErrorCall<T>
where T: ErrorFunc<'a, C> {
fn invalid_integer(context: &C, from: &str) -> Self {
T::call(context, ErrorType::InvalidInteger(from));
Self(PhantomData)
}
fn expected_integer(context: &C) -> Self {
T::call(context, ErrorType::ExpectedInteger);
Self(PhantomData)
}
fn invalid_float(context: &C, from: &str) -> Self {
T::call(context, ErrorType::InvalidFloat(from));
Self(PhantomData)
}
fn expected_float(context: &C) -> Self {
T::call(context, ErrorType::ExpectedFloat);
Self(PhantomData)
}
fn invalid_bool(context: &C, from: &str) -> Self {
T::call(context, ErrorType::InvalidBool(from));
Self(PhantomData)
}
fn expected_bool(context: &C) -> Self {
T::call(context, ErrorType::ExpectedBool);
Self(PhantomData)
}
fn expected_start_of_quote(context: &C) -> Self {
T::call(context, ErrorType::ExpectedStartOfQuote);
Self(PhantomData)
}
fn expected_end_of_quote(context: &C) -> Self {
T::call(context, ErrorType::ExpectedEndOfQuote);
Self(PhantomData)
}
fn invalid_escape(context: &C, from: &str) -> Self {
T::call(context, ErrorType::InvalidEscape(from));
Self(PhantomData)
}
fn expected_symbol(context: &C, from: &str) -> Self {
T::call(context, ErrorType::ExpectedSymbol(from));
Self(PhantomData)
}
}
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