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//! Filter expression language.
//!
//! This module contains methods to parse a given string into an abstract filter tree, check its
//! type and convert it to a [`Filter`][super::filters::Filter].
// Make it available in the grammar mod.
use super::{filters, FightOutcome, SearchField, Weekday};
use std::{error, fmt};
use lalrpop_util::{lalrpop_mod, lexer::Token, ParseError};
use thiserror::Error;
lalrpop_mod!(#[allow(clippy::all)] pub grammar, "/fexpr/grammar.rs");
#[derive(Debug)]
pub struct FError {
location: usize,
data: String,
kind: FErrorKind,
}
impl fmt::Display for FError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{} (at {})", self.kind, self.location)
}
}
impl error::Error for FError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
Some(&self.kind)
}
}
#[derive(Debug, Error)]
pub enum FErrorKind {
#[error("invalid regular expression: {0}")]
InvalidRegex(#[from] regex::Error),
#[error("invalid fight outcome")]
InvalidFightOutcome,
#[error("invalid weekday")]
InvalidWeekday,
#[error("invalid timestamp: {0}")]
InvalidTimestamp(#[from] chrono::format::ParseError),
#[error("invalid boss name")]
InvalidBoss,
}
/// Shortcut to create a new parser and parse the given input.
pub fn parse_logfilter<'a>(
input: &'a str,
) -> Result<Box<dyn filters::log::LogFilter>, ParseError<usize, Token<'a>, FError>> {
grammar::LogFilterParser::new().parse(input)
}
/// Extract the location from the given error.
pub fn location<T>(err: &ParseError<usize, T, FError>) -> usize {
match *err {
ParseError::InvalidToken { location } => location,
ParseError::UnrecognizedEOF { location, .. } => location,
ParseError::UnrecognizedToken {
token: (l, _, _), ..
} => l,
ParseError::ExtraToken { token: (l, _, _) } => l,
ParseError::User { ref error } => error.location,
}
}
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