rflex_lib/
ast.rs

1use crate::lexer::Op;
2
3pub enum Node {
4    Char(char),
5    BinaryExpr(BinaryExprNode),
6    UnaryExpr(UnaryExprNode),
7}
8
9pub struct BinaryExprNode {
10    pub left:  Box<Node>,
11    pub right: Box<Node>,
12    pub op: Op,
13}
14
15pub struct UnaryExprNode {
16    pub child: Box<Node>,
17    pub op: Op,
18}
19
20pub struct Match {
21    pub root: Node,
22    pub name: String
23}
24impl Node {
25    pub fn char(&self) -> char {
26        if let Node::Char(c) = *self { return c; }
27        panic!("Not A Letter!");
28    }
29    pub fn print(&self) {
30        print!("{}", self.to_string());
31    }
32
33    pub fn to_string(&self) -> String {
34        let mut out = String::new();
35        self._print(&self, 0, &mut out);
36        return out;
37    } 
38
39    /* OUTPUT TO XML? */
40    fn _print(&self, node: &Node, depth: u32, out: &mut String) {
41        let mut tabs = String::new();
42        for _ in 0..depth { tabs.push_str("  "); }
43        match node {
44            Node::BinaryExpr(n) => {
45                out.push_str(&format!("{tabs}<{:?}>\n", n.op));
46                self._print(&n.left, depth+1, out);
47                self._print(&n.right, depth+1, out);
48                out.push_str(&format!("{tabs}</{:?}>\n", n.op));
49            },
50            Node::UnaryExpr(n) => {
51                out.push_str(&format!("{tabs}<{:?}>\n", n.op));
52                self._print(&n.child, depth+1, out);
53                out.push_str(&format!("{tabs}</{:?}>\n", n.op));
54            },
55            Node::Char(c) => {
56                out.push_str(&format!(
57                    "{tabs}<\"{}\"> </\"{}\">\n",
58                    c.escape_debug(), c.escape_debug()
59                ));
60            }
61        }
62    }
63}
rflex_lib/ast.rs

rflex_lib/
ast.rs
