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+enum Elem { + ParenLeft, + Op(Op), + Item(T), +} + +impl Elem { + fn expect_item(self) -> T { + if let Elem::Item(item) = self { + item + } else { + panic!("Expected item"); + } + } + + fn expect_op(self) -> Op { + if let Elem::Op(op) = self { + op + } else { + panic!("Expected op"); + } + } + + fn expect_paren_left(self) { + if let Elem::ParenLeft = self { + () + } else { + panic!("Expected '('"); + } + } +} + +#[derive(Debug)] +struct Stack { + elems: Vec>, + same_precedence: bool, +} + +impl Stack +where + T: std::ops::Add + std::ops::Mul + std::fmt::Debug, +{ + fn new(same_precedence: bool) -> Self { + Self { + elems: Vec::new(), + same_precedence, + } + } + + fn push_item(&mut self, item: T) { + self.elems.push(Elem::Item(item)) + } + + fn push_op(&mut self, op: Op) { + self.elems.push(Elem::Op(op)) + } + + fn push_paren_left(&mut self) { + self.elems.push(Elem::ParenLeft) + } + + fn _peek_top(&self) -> &Elem { + &self.elems[self.elems.len() - 1] + } + + fn _peek_below_top(&self) -> &Elem { + &self.elems[self.elems.len() - 2] + } + + fn pop_item(&mut self) -> T { + self.elems.pop().expect("expect non empty stack").expect_item() + } + + fn pop_op(&mut self) -> Op { + self.elems.pop().expect("expect non empty stack").expect_op() + } + + fn pop_paren_left(&mut self) { + self.elems.pop().expect("expect non empty stack").expect_paren_left() + } + + fn _do_reduce_op(&self, finish: bool) -> bool { + match self._peek_below_top() { + Elem::Op(Op::Sum) => true, + Elem::Op(Op::Mul) => finish || self.same_precedence, + _ => false, + } + } + + fn is_empty(&self) -> bool { + self.elems.is_empty() + } + + fn eval_top(&mut self, finish: bool) { + while self.elems.len() > 2 && matches!(self._peek_top(), Elem::Item(_)) && self._do_reduce_op(finish) { + let value2 = self.pop_item(); + let op = self.pop_op(); + let value1 = self.pop_item(); + self.push_item(op.apply(value1, value2)); + } + } +} + +fn parse(mut line: &str, same_precedence: bool) -> T +where + T: std::ops::Add + std::ops::Mul + std::str::FromStr + std::fmt::Debug, + ::Err: std::fmt::Debug, +{ + let mut stack = Stack::new(same_precedence); + + loop { + line = line.trim(); + if line.is_empty() { + break; + } + if let Some(rem) = line.strip_prefix('+') { + stack.push_op(Op::Sum); + line = rem; + } else if let Some(rem) = line.strip_prefix('*') { + stack.push_op(Op::Mul); + line = rem; + } else if let Some(rem) = line.strip_prefix('(') { + stack.push_paren_left(); + line = rem; + } else if let Some(rem) = line.strip_prefix(')') { + stack.eval_top(true); + let item = stack.pop_item(); + stack.pop_paren_left(); + stack.push_item(item); + line = rem; + } else { + let num_end = line.find(|c: char| !c.is_ascii_digit()).unwrap_or(line.len()); + let num = line[..num_end].parse::().unwrap(); + stack.push_item(num); + line = &line[num_end..]; + } + stack.eval_top(false); + } + stack.eval_top(true); + let item = stack.pop_item(); + assert!(stack.is_empty()); + item +} + +fn main() { + println!("Sum of evaluated lines (simple math): {}", INPUT.lines().map(|l| parse::(l, true)).sum::()); + println!("Sum of evaluated lines (advanced math): {}", INPUT.lines().map(|l| parse::(l, false)).sum::()); +}