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// Copyright (C) 2021-2022 Soni L.
// SPDX-License-Identifier: MIT OR Apache-2.0
//! <!-- TODO figure out module-level docs for this -->
// #[cfg(doc)]
// use crate::PatternTypes;
/// These are errors that may be returned by the pattern compiler when
/// compiling a pattern.
///
/// "String" here refers to a string literal in the pattern, not the input
/// string. The input string is referred to as "the pattern".
#[derive(Debug)]
#[non_exhaustive]
pub enum PatternError<'a> {
// Syntax Errors:
/// The pattern contains an invalid string escape.
StringEscape(usize, &'a str),
/// The pattern ends in the middle of a string literal.
StringEnd(usize, &'a str),
/// The pattern contains an invalid regex escape.
RegexEscape(usize, &'a str),
/// The pattern ends in the middle of a regex literal.
RegexEnd(usize, &'a str),
/// The pattern contains characters that don't make up a token.
Token(usize, &'a str),
// Link Errors:
/// The pattern requests a parameter that wasn't provided.
UnknownParameter(usize, &'a str),
/// The pattern requests a predicate that wasn't provided.
UnknownPredicate(usize, &'a str),
/// The pattern contains an invalid regex.
Regex(usize, &'a str, ::regex::Error),
// Extra Errors:
/// The pattern contains a token which has not yet been implemented.
Unimplemented(usize, &'a str),
}
/// These are errors that may be returned by the matcher when matching a
/// pattern.
// #[derive(Clone, Debug)]
#[derive(Debug)]
#[non_exhaustive]
pub enum MatchError {
/// Returned if the pattern nests too deeply.
StackOverflow,
/// Returned if the pattern rejects the input.
ValidationError,
/// Returned if the pattern contains conflicting/unsatisfiable type
/// requirements.
Unsatisfiable,
}
#[derive(Debug)]
#[non_exhaustive]
pub enum QueryError {
/// Returned if the deserialization recurses too deeply.
StackOverflow,
/// Returned if there's nothing to deserialize.
Empty,
/// The query is unsatisfiable. This happens if e.g. there are multiple
/// values in the query but only one value can fit into the request.
Unsatisfiable,
/// Wrapped Serde error.
Serde(serde::de::value::Error),
}
impl std::fmt::Display for QueryError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::StackOverflow => write!(f, "stack overflow"),
Self::Empty => write!(f, "no results"),
Self::Unsatisfiable => write!(f, "unsatisfiable"),
Self::Serde(e) => e.fmt(f),
}
}
}
impl std::error::Error for QueryError {
}
impl serde::de::Error for QueryError {
fn custom<T>(msg: T) -> Self where T: std::fmt::Display {
Self::Serde(serde::de::value::Error::custom(msg))
}
}
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