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Started working on lexer. Temporarily using an external dependency.

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This commit is contained in:
Goren Barak 2023-11-24 10:59:30 -05:00
parent 2f942d3371
commit 503888bcee
7 changed files with 177 additions and 264 deletions
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88
Cargo.lock generated
View file

@ -2,6 +2,94 @@
# It is not intended for manual editing.
version = 3
[[package]]
name = "beef"
version = "0.5.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3a8241f3ebb85c056b509d4327ad0358fbbba6ffb340bf388f26350aeda225b1"
[[package]]
name = "fnv"
version = "1.0.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
[[package]]
name = "logos"
version = "0.13.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c000ca4d908ff18ac99b93a062cb8958d331c3220719c52e77cb19cc6ac5d2c1"
dependencies = [
"logos-derive",
]
[[package]]
name = "logos-codegen"
version = "0.13.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dc487311295e0002e452025d6b580b77bb17286de87b57138f3b5db711cded68"
dependencies = [
"beef",
"fnv",
"proc-macro2",
"quote",
"regex-syntax",
"syn",
]
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checksum = "dbfc0d229f1f42d790440136d941afd806bc9e949e2bcb8faa813b0f00d1267e"
dependencies = [
"logos-codegen",
]
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dependencies = [
"unicode-ident",
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[[package]]
name = "skylang"
version = "0.1.0"
dependencies = [
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1
Cargo.toml
View file

@ -6,3 +6,4 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
logos = "0.13.0"

2
src/codegen/fasm.rs
View file

@ -153,7 +153,7 @@ pub fn fasm_codegen(exprs: &Vec<Expr>, not_a_function: bool) -> String {
// Return something from a function.
Expr::Return(e) => {
// Do the operation that should later be returned.
asm_start.push_str(fasm_codegen!(fun: &e));
asm_start.push_str(fasm_codegen!(fun: &e).as_str());
// Move the return value to rbp + 8.
asm_start.push_str("mov [rbp + 8], rax");
// 8(%rbp) ← return_value

1
src/lex/mod.rs
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@ -1,2 +1 @@
pub mod tok;
pub mod parse;

156
src/lex/parse.rs
View file

@ -1,156 +0,0 @@
#![allow(unused)]
use super::tok::*;
pub fn match_single_char<'a>(word: &'a str) -> Option<Token<'a>> {
macro_rules! tok {
($tt:expr) => {
Some(Token::new($tt, word))
};
};
let tok = match word {
";" => tok!(Semicolon),
"=" => tok!(Equal),
"(" => tok!(LeftParen),
")" => tok!(RightParen),
"{" => tok!(LeftBrace),
"}" => tok!(RightBrace),
"," => tok!(Comma),
"." => tok!(Dot),
"-" => tok!(Minus),
"+" => tok!(Plus),
"/" => tok!(Slash),
"*" => tok!(Star),
"%" => tok!(Percent),
"!" => tok!(Bang),
":" => tok!(Colon),
"<" => tok!(Less),
">" => tok!(Greater),
_ => None
};
tok
}
pub fn match_keyword<'a>(word: &'a str) -> Option<Token<'a>> {
macro_rules! tok {
($tt:expr) => {
Some(Token::new($tt, word))
};
};
let tok = match word {
"fn" => tok!(Fn),
"let" => tok!(Let),
"if" => tok!(If),
"else" => tok!(Else),
"while" => tok!(While),
"elif" => tok!(Elif),
"return" => tok!(Return),
"for" => tok!(For),
"in" => tok!(In),
"break" => tok!(Break),
"continue" => tok!(Continue),
"true" => tok!(True),
"false" => tok!(False),
_ => None
};
tok
}
pub fn match_two_char<'a>(word: &'a str) -> Option<Token<'a>> {
macro_rules! tok {
($tt:expr) => {
Some(Token::new($tt, word))
};
};
let tok = match word {
"==" => tok!(EqualEqual),
"!=" => tok!(BangEqual),
"<=" => tok!(LessEqual),
">=" => tok!(GreaterEqual),
_ => None
};
tok
}
pub fn match_string_literal<'a>(word: &'a str) -> Option<Token<'a>> {
macro_rules! tok {
($tt:expr) => {
Some(Token::new($tt, word))
};
};
let mut chars = word.chars();
if word.starts_with("\"") {
chars.next();
while let Some(char) = chars.next() {
if char == '\"' {
return tok!(String);
}
}
}
if word.starts_with("\'") {
while let Some(char) = chars.next() {
if char == '\'' {
return tok!(String);
}
}
}
None
}
pub fn match_int_literal<'a>(word: &'a str) -> Option<Token<'a>> {
macro_rules! tok {
($tt:expr) => {
Some(Token::new($tt, word))
};
};
let mut chars = word.chars();
let mut tok = None;
while let Some(char) = chars.next() {
if char.is_digit(10) {
tok = tok!(Number);
} else {
return None;
}
}
tok
}
pub fn match_identifier<'a>(word: &'a str) -> Option<Token<'a>> {
macro_rules! tok {
($tt:expr) => {
Some(Token::new($tt, word))
};
};
let mut chars = word.chars().peekable();
let mut tok: Option<Token<'a>> = None;
if chars.peek().unwrap_or(&'❌').is_ascii_alphabetic() {
while let Some(char) = chars.next() {
if char.is_ascii() && match_single_char(char.to_string().as_str()).is_none() {
tok = tok!(Identifier);
} else {
return None;
}
}
} else {
return None;
}
tok
}

130
src/lex/tok.rs
View file

@ -1,128 +1,106 @@
#![allow(unused)]
use logos::Logos;
use logos::Lexer;
use core::iter::Peekable;
pub use TokenType::*;
use super::parse::*;
#[derive(Debug)]
pub struct Token<'a> {
tt: TokenType,
word: &'a str,
}
#[derive(Debug)]
#[derive(Debug, Logos)]
#[logos(skip r"[ \t\n\f]+")]
pub enum TokenType {
EOF,
// SINGLE CHARACTER TOKENS
#[token(";")]
Semicolon, // ;
#[token("=")]
Equal, // =
#[token("(")]
LeftParen, // (
#[token(")")]
RightParen, // )
#[token("{")]
LeftBrace, // {
#[token("}")]
RightBrace, // }
#[token(",")]
Comma, // ,
#[token(".")]
Dot, // .
#[token("-")]
Minus, // -
#[token("+")]
Plus, // +
#[token("/")]
Slash, // /
#[token("*")]
Star, // *
#[token("%")]
Percent, // %
#[token("!")]
Bang, // !
#[token(":")]
Colon, // :
#[token("<")]
Less, // <
#[token(">")]
Greater, // >
#[token("|")]
Pipe, // |
// KEYWORDS
Fn, // fn
#[token("fnaf")]
Fnaf, // fnaf
#[token("let")]
Let, // let
#[token("if")]
If, // if
#[token("else")]
Else, // else
#[token("while")]
While, // while
#[token("elif")]
Elif, // elif
#[token("return")]
Return, // return
#[token("for")]
For, // for
#[token("in")]
In, // in
#[token("break")]
Break, // break
#[token("continue")]
Continue, // continue
// TWO CHARACTER TOKENS
#[token("==")]
EqualEqual, // ==
#[token("!=")]
BangEqual, // !=
#[token("<=")]
LessEqual, // <=
#[token(">=")]
GreaterEqual, // >=
// LITERALS
#[regex("(\"[^\".+]\")|('[^'.+]')")]
String, // A string literal.
#[regex("[0-9]+")]
Number, // An integer.
#[regex(r#"[^[0-9]^"^-^[ \t\n\f]^\.^=^(^)^{^}.]+[^"^-^=^\..^[ \t\n\f]^(^)^{^}]*"#)]
Identifier, // An identifier.
#[token("true")]
True, // true
#[token("false")]
False, // false
Null, // None
// ERROR
Error, // A syntax error.
#[token("none")]
Null, // none
}
#[derive(Debug)]
pub struct Lexer<'a> {
source: &'a str,
tokens: Vec<Token<'a>>,
current: usize,
after: &'a str
}
impl<'a> Lexer<'a> {
pub fn new() -> Self {
Lexer {
source: "",
tokens: Vec::new(),
current: 0,
after: ""
}
}
}
impl<'a> std::iter::Iterator for Lexer<'a> {
type Item = Option<char>;
fn next(&mut self) -> Option<Self::Item> {
unimplemented!("Iterating over lexer is not implemented.");
}
}
impl<'a> From<&'a str> for Lexer<'a> {
fn from(value: &'a str) -> Self {
Lexer {
source: value,
tokens: Vec::new(),
current: 0,
after: value
}
}
}
impl<'a> From<&'a std::string::String> for Lexer<'a> {
fn from(value: &'a std::string::String) -> Self {
Lexer {
source: value.as_str(),
tokens: Vec::new(),
current: 0,
after: value.as_str()
}
}
}
impl<'a> Token<'a> {
pub fn new(tt: TokenType, word: &'a str) -> Self {
Token {
tt,
word
}
pub fn lex_str(this: &str) -> Vec<TokenType> {
let mut buf = Vec::new();
let mut lexer = TokenType::lexer(this);
while let Some(Ok(token)) = lexer.next() {
buf.push(token);
}
pub fn empty() -> Self {
Token {
tt: EOF,
word: ""
}
}
buf
}

63
src/main.rs
View file

@ -1,43 +1,46 @@
#![allow(warnings)]
pub mod lex;
use crate::lex::tok::*;
pub mod codegen;
use crate::codegen::fasm::*;
use crate::parse::ast::*;
pub mod parse;
fn main() {
let fc = fasm_codegen!(
vec![
Expr::VarDefinition(VarDefinition {name: "goren", value: Value::Number(10)}),
Expr::MathExpr(Math {
left: &Value::Var(VarReference { name: "goren"}),
right: &Value::Number(17),
operator: MathOperator::OP_MULT
}
),
Expr::FunDefinition(FunDefinition {
name: "adder", contents: vec![
Expr::MathExpr(
Math {
left: &Value::Param(ParamReference {param_number: 0}),
right: &Value::Param(ParamReference {param_number: 1}),
operator: MathOperator::OP_ADD
}
)
]
}),
// let fc = fasm_codegen!(
// vec![
// Expr::VarDefinition(VarDefinition {name: "goren", value: Value::Number(10)}),
// Expr::MathExpr(Math {
// left: &Value::Var(VarReference { name: "goren"}),
// right: &Value::Number(17),
// operator: MathOperator::OP_MULT
// }
// ),
// Expr::FunDefinition(FunDefinition {
// name: "adder", contents: vec![
// Expr::MathExpr(
// Math {
// left: &Value::Param(ParamReference {param_number: 0}),
// right: &Value::Param(ParamReference {param_number: 1}),
// operator: MathOperator::OP_ADD
// }
// )
// ]
// }),
Expr::FunCall(
FunCall {
name: "adder",
params: vec![Value::Var(VarReference {name: "goren"}), Value::Number(6)]
}
),
// Expr::FunCall(
// FunCall {
// name: "adder",
// params: vec![Value::Var(VarReference {name: "goren"}), Value::Number(6)]
// }
// ),
Expr::Breakpoint
]
);
// Expr::Breakpoint
// ]
// );
println!("{}", fc);
// println!("{}", fc);
println!("{:?}", lex_str("fnaf main() {}"));
}