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#![allow(dead_code)]
use thiserror::Error;
#[derive(Debug, Error)]
pub enum LexerError {
#[error("Unexpected token")]
UnexpectedToken,
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum TokenType {
// Meta
DocComment,
Comment,
// Brackets
OpeningParen, // (
ClosingParen, // )
OpeningBracket, // [
ClosingBracket, // ]
OpeningBrace, // {
ClosingBrace, // }
// Operators
Plus, // +
PlusPlus, // ++
Minus, // -
Star, // *
StarStar, // **
Slash, // /
Perc, // %
Tilde, // ~
PlusEq, // +=
PlusPlusEq, // ++=
MinusEq, // -=
StarEq, // *=
StarStarEq, // **=
SlashEq, // /=
PercEq, // %=
Amp, // &
AmpAmp, // &&
Pipe, // |
PipePipe, // ||
Eq, // =
EqEq, // ==
Bang, // !
BangBang, // !!
BangEq, // !=
Lt, // <
LtLt, // <<
LtEq, // <=
Gt, // >
GtGt, // >>
GtEq, // >=
Comma,
Question, // ?
QuestionDot, // ?.
QuestionQuestion, // ??
Dot, // .
DotDot, // ..
Colon, // :
ColonColon, // ::
SemiColon, // ;
Arrow, // ->
// Keywords
Val,
Var,
Fn,
If,
Else,
While,
For,
In,
Loop,
Break,
Continue,
As,
// Misc
Literal(Literal),
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum Literal {
Numeric,
Boolean,
Character,
String,
Regex,
}
#[derive(Debug, Default)]
pub struct Location {
row: u32,
column: u32,
}
#[derive(Debug)]
pub struct Token<'a> {
pub tt: TokenType,
pub lexeme: &'a str,
start: Location,
end: Location,
}
pub struct Lexer<'a> {
source: &'a [u8],
start: Location,
end: Location,
}
impl<'a> Lexer<'a> {
fn new(source: &'a str) -> Self {
Self {
source: source.as_bytes(),
start: Default::default(),
end: Default::default(),
}
}
}
impl<'a> Iterator for Lexer<'a> {
type Item = Token<'a>;
fn next(&mut self) -> Option<Self::Item> {
unimplemented!()
}
}
#[cfg(test)]
mod tests {
#[test]
fn basic_test_a() {
//
}
}
|
