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use pest::Parser;
#[cfg(debug_assertions)]
const _GRAMMAR: &str = include_str!("generate.pest");
#[derive(Parser)]
#[grammar = "generate.pest"]
pub struct GenerateParser;
pub fn parse_generate(s: &str) -> Option<Vec<String>> {
let pairs = GenerateParser::parse(Rule::file, s);
if pairs.is_err() {
return None;
}
let mut found = Vec::new();
for pair in pairs.unwrap() {
// A pair is a combination of the rule which matched and a span of input
// A pair can be converted to an iterator of the tokens which make it up:
for inner_pair in pair.into_inner() {
let inner_span = inner_pair.clone().as_span();
match inner_pair.as_rule() {
Rule::filename => {
//println!("fname: {}", inner_span.as_str());
// https://rust-lang-nursery.github.io/rust-clippy/v0.0.212/index.html#clone_double_ref
let s: String = inner_span.as_str().to_string();
//println!("filename: {}", s);
found.push(s);
}
Rule::EOI => (),
e => {
println!("unreachable: {:?}", e);
unreachable!()
}
};
}
}
if found.is_empty() {
None
} else {
Some(found)
}
}
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