lexgen 0.16.0

A fully-featured lexer generator implemented as a proc macro
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

use crate::ast::RuleRhs;

pub struct SemanticActionTable {
    table: Vec<RuleRhs>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct SemanticActionIdx(usize);

impl SemanticActionTable {
    pub fn new() -> Self {
        Self { table: vec![] }
    }

    pub fn add(&mut self, action: RuleRhs) -> SemanticActionIdx {
        let idx = self.table.len();
        self.table.push(action);
        SemanticActionIdx(idx)
    }

    pub fn iter(&self) -> impl Iterator<Item = (SemanticActionIdx, &RuleRhs)> {
        self.table
            .iter()
            .enumerate()
            .map(|(idx, expr)| (SemanticActionIdx(idx), expr))
    }
}

impl SemanticActionIdx {
    pub fn as_usize(&self) -> usize {
        self.0
    }
}