7318fea4-6106-4edc-99fa-d96d515f2133
use std::env;/*For amplify [amplify.connorcode.com]github.com/basicprogrammer10/amplify* Tokenize* Parse AST* Evaluate# EX 15*6+3-1|/-\/+\ 1/*\ 35 6# EX 27*2+9*5-6|/-\/+\ 6/ \/*\ /*\7 2 9 5*/*/*/*/// 61+21-1218+72-7274fn main() {for i in env::args().skip(1) {let tokens = tokenize(&i);let tree = create_tree(tokens);let result = evaluate(tree);println!("{result}");}}#[derive(Debug, Clone)]enum Token {Number(i32),Op(Ops),Group(Vec<Token>),Tree(Ops, Box<Token>, Box<Token>),}#[derive(Debug, Clone, Copy)]enum Ops {Add,Sub,Mul,}fn evaluate(tree: Token) -> i32 {match tree {Token::Tree(op, left, right) => {let left = evaluate(*left);let right = evaluate(*right);match op {Ops::Add => left + right,Ops::Sub => left - right,Ops::Mul => left * right,}}Token::Number(n) => n,_ => panic!("Invalid token"),}}fn create_tree(mut tokens: Vec<Token>) -> Token {fn get_max_prio(tokens: &[Token]) -> usize {tokens.iter().filter_map(|x| match x {Token::Op(i) => Some(i.prio()),_ => None,}).max().unwrap()}fn contains_non_tree(tokens: &[Token]) -> bool {tokens.iter().filter(|x| !matches!(x, Token::Tree(_, _, _))).count()> 0}while contains_non_tree(&tokens) {let max_prio = get_max_prio(&tokens);let mut i = 0;while i < tokens.len() {if let Token::Op(op) = tokens[i] {if op.prio() < max_prio {i += 1;continue;}let left = tokens.remove(i - 1).make_tree();let right = tokens.remove(i).make_tree();tokens[i - 1] = Token::Tree(op, Box::new(left), Box::new(right));break;}i += 1;}}debug_assert!(tokens.len() == 1);tokens[0].clone()}fn tokenize(inp: &str) -> Vec<Token> {let mut out = Vec::new();let mut working = String::new();let mut in_group = false;for i in inp.chars() {if !i.is_ascii_digit() && !working.is_empty() && !in_group {out.push(Token::Number(working.parse().unwrap()));working.clear();}match i {// Groups'(' => in_group = true,')' => {in_group = false;out.push(Token::Group(tokenize(&working)));working.clear();}i if in_group => working.push(i),// Operations'+' => out.push(Token::Op(Ops::Add)),'-' => out.push(Token::Op(Ops::Sub)),'*' => out.push(Token::Op(Ops::Mul)),// Numbersi if i.is_ascii_digit() => working.push(i),_ => panic!("INVALID CHAR: {}", i),}}if !working.is_empty() {out.push(Token::Number(working.parse().unwrap()));}out}impl Ops {fn prio(&self) -> usize {match self {Ops::Add | Ops::Sub => 1,Ops::Mul => 2,}}}impl Token {fn make_tree(self) -> Token {match self {Token::Group(tokens) => create_tree(tokens),_ => self,}}}