parsy 0.16.3

An easy-to-use, efficient parser combinators library
Documentation 
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use std::sync::LazyLock;

use perfect_derive::perfect_derive;

use crate::{Parser, ParserInput, ParserNonConstUtils, ParserResult};

/// See [`lazily_define`](`crate::parsers::helpers::lazily_define`)
#[perfect_derive(Debug, Clone, Copy)]
pub struct LazilyDefined<T> {
    parser_ref: LazyLock<Box<dyn Parser<T> + Send + Sync>>,
}

impl<T> LazilyDefined<T> {
    pub const fn new(lazy_define: fn() -> Box<dyn Parser<T> + Send + Sync>) -> Self {
        Self {
            parser_ref: LazyLock::new(lazy_define),
        }
    }

    pub fn init(&self) {
        LazyLock::force(&self.parser_ref);
    }
}

impl<T> Parser<T> for LazilyDefined<T> {
    fn parse_inner(&self, input: &mut ParserInput) -> ParserResult<T> {
        self.parser_ref.parse(input)
    }
}