added quitting to shell and started lexer

This commit is contained in:
Schrottkatze 2021-12-19 21:38:21 +01:00
parent 0eed22213f
commit d5da7b0f26
8 changed files with 117 additions and 7 deletions

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2+5
3 + 6
6 / 4
2.5 + 1.7

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use std::env;
use std::fs;
mod preprocessor;
mod shell;
mod parsing;
use parsing::preprocessor::preprocess;
fn main() {
let args: Vec<String> = env::args().collect();
let file = fs::read_to_string(&args[1]).expect("Couldnt read file:");
println!("{:?}", preprocessor::preprocess(file));
let run_shell = String::from("RUN_SH");
let path: &String = match args.get(1) {
Some(path) => path,
None => &run_shell,
};
if path == "RUN_SH" {
shell::run_shell();
} else {
let file = fs::read_to_string(path).expect("Couldnt read file:");
let code = preprocess(file);
}
}
//fn parse_and_interpret(code: String) {
//}

62
src/parsing/lexer.rs Normal file
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use preprocessor::preprocess;
struct Lexer {
code: String,
pos: usize,
current: Option<char>,
}
impl Lexer {
pub fn new(code: String) -> Lexer {
Lexer {
code,
pos: 1,
current: None,
}
}
pub fn next(&mut self) {
self.pos += 1;
self.current = if self.pos < self.code.len() {
self.code.chars().nth(self.pos)
} else {
None
};
}
pub fn tokenize(&mut self) {
let mut tokens: Vec<Token> = vec![];
self.code = preprocess(self.code);
loop {
//let token = match self.current {
//Some('+') => Token::ADD,
//Some('-') => Token::SUBTRACT,
//Some('*') => Token::MULTIPLY,
//Some('/') => Token::DIVIDE,
//Some('(') => Token::LBRACK,
//Some(')') => Token::RBRACK,
//Some(' ') => continue,
//Some('\n') => continue,
//None => break,
//Some(_) => continue,
//};
tokens.push(match self.current {
Some('+') => Token::ADD,
Some('-') => Token::SUBTRACT,
Some('*') => Token::MULTIPLY,
Some('/') => Token::DIVIDE,
Some('(') => Token::LBRACK,
Some(')') => Token::RBRACK,
Some(' ') => continue,
Some('\n') => continue,
None => break,
Some(_) => continue,
});
self.next();
}
println!("{:?}", tokens);
}
}

3
src/parsing/mod.rs Normal file
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pub mod lexer;
pub mod preprocessor;
pub mod token;

13
src/parsing/token.rs Normal file
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pub enum Token {
INT,
FLOAT,
ADD,
SUBTRACT,
MULTIPLY,
DIVIDE,
LBRACK,
RBRACK,
}
impl Token {}

18
src/shell.rs Normal file
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use std::io;
pub fn run_shell() {
'shell: loop {
let string = get_line();
if string.eq("q\n") || string.eq("quit\n") {
break 'shell;
}
println!("{}", string);
}
}
fn get_line() -> String {
let mut line = String::new();
io::stdin().read_line(&mut line).unwrap();
line
}

0
src/stdlib/io.rs Normal file
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