76 lines
1.4 KiB
Rust
76 lines
1.4 KiB
Rust
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use core::fmt;
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use std::io;
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use std::io::Write;
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fn main() {
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let stdin = io::stdin();
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let mut buffer = String::new();
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loop {
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print!("> ");
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io::stdout().flush().unwrap();
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stdin.read_line(&mut buffer).unwrap();
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let tokens = tokenisator(&buffer);
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buffer.clear();
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}
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}
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fn tokenisator(task: &str) -> Vec<Token> {
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let mut tokens = Vec::<Token>::new();
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let chars: Vec<char> = task.chars().collect();
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let mut pointer = 0;
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while pointer < task.len() {
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dbg!(pointer, task.len());
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let c = chars[pointer];
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match c {
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'0' .. '9' => {
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let mut end = pointer;
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while end < task.len() {
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let cur_c = chars[end];
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if !cur_c.is_ascii_digit() {
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break;
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}
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end += 1;
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}
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tokens.push(Token::Number(
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task.get(pointer..end).unwrap().parse::<i32>().unwrap()
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));
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pointer = end-1;
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}
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'+' => tokens.push(Token::Addition),
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'-' => tokens.push(Token::Substruction),
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'*' => tokens.push(Token::Multiplication),
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'/' => tokens.push(Token::Division),
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'(' => tokens.push(Token::BracketOpen),
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')' => tokens.push(Token::BracketClose),
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_ => {}
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}
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pointer += 1;
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}
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println!("{}", task);
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for t in &tokens {
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println!("{:?}", t);
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}
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return tokens;
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}
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#[derive(Debug)]
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enum Token {
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Number(i32),
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Addition,
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Substruction,
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Multiplication,
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Division,
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BracketOpen,
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BracketClose,
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}
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