expr_solver/
ast.rs

1use crate::token::Token;
2
3/// Enum for modeling AST nodes.
4pub enum AST {
5    // each node.
6    Node(Token),
7    // connections.
8    Con(Token, Vec<AST>),
9}
10
11/// fmt display for ast
12/// recursively prints AST.
13impl core::fmt::Display for AST {
14    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
15        match self {
16            AST::Node(token) => write!(f, " {}", token),
17            AST::Con(head, rest) => {
18                write!(f, "({}", head)?;
19                for node in rest {
20                    write!(f, "{}", node)?;
21                }
22
23                write!(f, ")")
24            }
25        }
26    }
27}
expr_solver/ast.rs

expr_solver/
ast.rs
