1use crate::{
2 node::{Alternation, OperatorFlattenedNode},
3 regex::{FiniteStateAutomaton, FiniteStateAutomatonConfig},
4 semantic_error::SemanticError,
5 InternedStrings,
6};
7
8#[allow(clippy::result_large_err)]
9pub fn compile_one_regex_string(
10 regex_string: &str,
11 config: FiniteStateAutomatonConfig,
12) -> Result<FiniteStateAutomaton, SemanticError> {
13 let regex: Result<FiniteStateAutomaton, SemanticError> = match config {
14 FiniteStateAutomatonConfig::Dfa(ref config) => {
15 kbnf_regex_automata::dfa::dense::Builder::new()
16 .configure(config.clone())
17 .build(regex_string)
18 .map(FiniteStateAutomaton::Dfa)
19 .map_err(SemanticError::DfaRegexBuildError)
20 }
21 };
22 regex
23}
24
25pub fn from_terminals_to_regex_string(
26 terminals: &[Alternation],
27 interned_strings: &InternedStrings,
28) -> String {
29 let regex = terminals
30 .iter()
31 .map(|x| x.concatenations.first().unwrap())
32 .map(|x| match x {
33 OperatorFlattenedNode::Terminal(x) => x,
34 _ => unreachable!(),
35 })
36 .map(|x| regex_lite::escape(interned_strings.terminals.resolve(*x).unwrap()))
37 .collect::<Vec<_>>()
38 .join("|");
39 format!(r"\A(?:{})\z", regex)
40}