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Math works!

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This commit is contained in:
Goren Barak 2023-12-15 17:11:58 -05:00
parent 626f1694f4
commit ac72d8add8
2 changed files with 28 additions and 31 deletions
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11
src/lex/tok.rs
View file

@ -1,4 +1,5 @@
#![allow(unused)]
use std::string::String;
use logos::Logos;
use logos::Lexer;
use core::iter::Peekable;
@ -84,11 +85,11 @@ pub enum Token {
// LITERALS
#[regex(r#"("[^"]*")|('[^']*')"#)]
String, // A string literal.
StringLiteral, // A string literal.
#[regex("[0-9]+", |lex| lex.slice().parse().ok())]
Number(u64), // An integer.
#[regex(r#"[^[0-9]^"^-^[ \t\n\f]^\.^=^(^)^{^}.^,^;^[+-/*%]]+[^"^-^=^\..^[ \t\n\f]^(^)^{^}^,^;^[+-/*%]]*"#)]
Identifier, // An identifier.
Number(u64), // An integer.
#[regex(r#"[^[0-9]^"^-^[ \t\n\f]^\.^=^(^)^{^}.^,^;^[+-/*%]]+[^"^-^=^\..^[ \t\n\f]^(^)^{^}^,^;^[+-/*%]]*"#, |lex| lex.slice().to_owned())]
Identifier(String), // An identifier.
#[token("true")]
True, // true
#[token("false")]
@ -147,7 +148,7 @@ impl std::fmt::Display for Token {
GreaterEqual => write!(f, ">="),
String => write!(f, "[string]"),
Number(n) => write!(f, "{}", n),
Identifier => write!(f, "identifier"),
Identifier(i) => write!(f, "{}", i),
True => write!(f, "true"),
False => write!(f, "false"),
Null => write!(f, "none"),

48
src/parse/parse.rs
View file

@ -10,38 +10,34 @@ macro_rules! unwrap {
}
}
pub fn parse_math(mut tokens: Lexer<Token>) -> Option<Expr> {
if let Some(left) = parse_math(tokens) {
if let Some(op) = match_operator(tokens) {
if let Some(Ok(Number(right))) = tokens.next() {
return Some(Expr::MathExpr(Math {left: Rc::new(left), right: Rc::new(Expr::Number(right)), operator: op}));
}
} else {
pub fn expect_number(n: Option<Result<Token, ()>>) -> Expr<'static> {
match n {
Some(Ok(Number(res))) => Expr::Number(res),
Some(Ok(tok)) => {
println!("Expected a number, got: {}", tok);
std::process::exit(1);
}
_ => {
println!("Expected a number, got EOF");
std::process::exit(1);
}
}
None
}
pub fn parse_global_declaration(mut tokens: Lexer<Token>) -> Option<Expr> {
let mut tok = None;
if unwrap!(tokens) == Let && unwrap!(tokens) == Identifier {
let name = tokens.slice();
println!("{:?}", name);
if unwrap!(tokens) == Equal {
let temp_token = unwrap!(tokens);
if let Number(n) = temp_token {
tok = Some(Expr::GlobalDefinition(Rc::new(VarDefinition {name, value: n})));
}
}
}
tok
pub fn parse_math(mut tokens: Lexer<Token>) -> Option<Expr> {
let mut left = expect_number(tokens.next());
loop {
let op = tokens.next();
if !match_operator(&op).is_some() { break }
let right = expect_number(tokens.next());
left = Expr::MathExpr(Math {left: Rc::new(left), right: Rc::new(right), operator: match_operator(&op)?});
}
Some(left)
}
pub fn match_operator(mut tokens: Lexer<Token>) -> Option<MathOperator> {
if let Some(Ok(token)) = tokens.next() {
pub fn match_operator(token: &Option<Result<Token, ()>>) -> Option<MathOperator> {
if let Some(Ok(token)) = token {
return match token {
Plus => Some(MathOperator::OP_ADD),
Minus => Some(MathOperator::OP_SUB),