diff --git a/src/lexer.rs b/src/lexer.rs index 5ecaa8a..99148d7 100644 --- a/src/lexer.rs +++ b/src/lexer.rs @@ -1,69 +1,78 @@ -use logos::{Lexer, Logos, Span}; +use logos::{Lexer, Logos}; use crate::variables::Abool; -pub struct PeekableLexer<'source> { - lexer: Lexer<'source, Token>, - peeked: Option>, -} - -impl<'source> PeekableLexer<'source> { - pub fn lexer(source: &'source str) -> Self { - Self { - lexer: Token::lexer(source), - peeked: None, - } - } - - /// Returns a reference to the next() value without advancing the iterator. - #[inline] - pub fn peek(&mut self) -> &Option { - if self.peeked.is_none() { - self.peeked = Some(self.lexer.next()); - } - self.peeked.as_ref().unwrap() - } - - /// Get the range for the current token in `Source`. - #[inline] - pub fn span(&self) -> Span { - self.lexer.span() - } - - /// Get a string slice of the current token. - #[inline] - pub fn slice(&self) -> &'source str { - self.lexer.slice() - } - - /// Get a slice of remaining source, starting at the end of current token. - #[inline] - pub fn remainder(&self) -> &'source str { - self.lexer.remainder() - } -} - -impl<'source> Iterator for PeekableLexer<'source> { - type Item = Token; - - /// Advances the iterator and returns the next value. - /// - /// Returns [`None`] when iteration is finished. - /// Individual iterator implementations may choose to resume iteration, and so calling `next()` - /// again may or may not eventually start returning [`Some(Item)`] again at some point. - #[inline] - fn next(&mut self) -> Option { - match self.peeked.take() { - Some(v) => v, - None => self.lexer.next(), - } - } -} - #[derive(Logos, Debug, PartialEq, Clone)] pub enum Token { + // Symbols + #[token("(")] + LeftParenthesis, + + #[token(")")] + RightParenthesis, + + #[token("[")] + LeftBracket, + + #[token("]")] + RightBracket, + + #[token("{")] + LeftCurly, + + #[token("}")] + RightCurly, + + #[token(";")] + Semicolon, + + #[token(".")] + Dot, + + #[token(",")] + Comma, + + // Operators + #[token("+")] + Plus, + + #[token("-")] + Minus, + + #[token("*")] + Star, + + #[token("/")] + FwdSlash, + + #[token("=")] + Equal, + + // Logical operators + #[token("<")] + LessThan, + + #[token(">")] + GreaterThan, + + #[token("==")] + EqualEqual, + + #[token("!=")] + NotEqual, + + #[token("&")] + And, + + #[token("|")] + Or, + + #[token("!|aint")] // also add aint as a not keyword + Not, + + // Keywords #[token("functio")] - Function, + Functio, /// Brain fuck FFI #[token("bff")] @@ -84,7 +93,7 @@ pub enum Token { #[token("T-Dark")] TDark, - // Expressions + // Control flow keywords #[token("if")] If, @@ -94,17 +103,22 @@ pub enum Token { #[token("break")] Break, + /// HopBack hops on the back of loop - like `continue` #[token("hopback")] HopBack, // Literals /// True, False #[regex("true|false", get_bool)] - Boolean(bool), + Bool(bool), /// Always, Sometimes, Never #[regex("always|sometimes|never", get_abool)] - Aboolean(Abool), + Abool(Abool), + + /// Base52 based character ('a') + #[token("'.*'")] + Char, /// String #[regex("\"(\\.|[^\"])*\"", get_string)] @@ -118,80 +132,11 @@ pub enum Token { #[regex(r"[a-zA-Z_][a-zA-Z_0-9]*", get_iden)] Identifier(String), - #[regex("nul")] - Nul, - - #[token("(")] - LeftParenthesis, - - #[token(")")] - RightParenthesis, - - #[token("[")] - LeftBracket, - - #[token("]")] - RightBracket, - - #[token("{")] - LeftBrace, - - #[token("}")] - RightBrace, - - #[token(";")] - Semicolon, - - #[token(".")] - FullStop, - - #[token(",")] - Comma, - #[regex(r"owo.*")] Comment, - // Operators - #[token("-")] - Subtract, - - #[token("+")] - Addition, - - #[token("*")] - Multiply, - - #[token("/")] - Divide, - - #[token("=")] - Assignment, - - // Logical operators - #[token("<")] - OpLt, - - #[token(">")] - OpGt, - - #[token("==")] - OpEq, - - #[token("!=")] - OpNeq, - - #[token("&")] - LogAnd, - - #[token("|")] - LogOr, - - #[token("!|aint")] // also add aint as a not keyword - LogNot, - - /// Base52 based character ('a') - #[token("'.*'")] - Char, + #[regex("nul")] + Nul, #[regex(r"[ \t\n\f]+", logos::skip)] #[error] @@ -233,25 +178,25 @@ mod tests { fn simple_fn() { let code = "functio test() { var a = 3; if a == 3 { a print } }"; let expected = &[ - Function, + Functio, Identifier("test".to_owned()), LeftParenthesis, RightParenthesis, - LeftBrace, + LeftCurly, Variable, Identifier("a".to_owned()), - Assignment, + Equal, Integer(3), Semicolon, If, Identifier("a".to_owned()), - OpEq, + EqualEqual, Integer(3), - LeftBrace, + LeftCurly, Identifier("a".to_owned()), Print, - RightBrace, - RightBrace, + RightCurly, + RightCurly, ]; let lexer = Token::lexer(code); let result: Vec = lexer.collect();