1 files changed, 66 insertions, 0 deletions
diff --git a/src/fexpr/mod.rs b/src/fexpr/mod.rs
new file mode 100644
index 0000000..5610aba
--- /dev/null
+++ b/src/fexpr/mod.rs
@@ -0,0 +1,66 @@
+//! 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,
+    }
+}