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#[cfg(feature = "std")]
mod rec_sync {
use crate::alloc::Arc;
use crate::alloc::Box;
use crate::ctor::Adapter;
use crate::ctor::Ctor;
use crate::ctor::Handler;
use crate::ctx::Context;
use crate::ctx::Match;
use crate::std::Mutex;
pub type RecursiveCtorSync<'b, C, O, H> =
Arc<Mutex<Option<Adapter<C, Box<dyn Ctor<C, O, H> + Send + Sync + 'b>>>>>;
///
/// This function will construct a [RecursiveCtorSync] for recursive parsing,
/// which accepts a closure as a parameter,
/// and the parameter of the closure is the return value of the function.
///
/// # Example
///
/// ```
/// # use neure::{prelude::*, regex::rec_parser};
/// #
/// # fn main() -> color_eyre::Result<()> {
/// # color_eyre::install()?;
/// // into_dyn_ctor using by rec_parser
/// let parser = rec_parser(|ctor| {
/// let re = u8::is_ascii_lowercase.once();
///
/// ctor.clone()
/// .or(re)
/// .enclose(b"{", b"}")
/// .or(ctor.clone().or(re).enclose(b"[", b"]"))
/// });
///
/// assert_eq!(BytesCtx::new(b"[a]").ctor(&parser)?, b"a");
/// assert_eq!(BytesCtx::new(b"{{[[{[{b}]}]]}}").ctor(&parser)?, b"b");
/// assert_eq!(BytesCtx::new(b"[{{{[c]}}}]").ctor(&parser)?, b"c");
/// Ok(())
/// # }
/// ```
///
pub fn rec_parser_sync<'a, 'b, C, O, I, H>(
mut handler: impl FnMut(RecursiveCtorSync<'b, C, O, H>) -> I,
) -> RecursiveCtorSync<'b, C, O, H>
where
C: Match<'a>,
H: Handler<C>,
I: Ctor<C, O, H> + Send + Sync + 'b,
{
let r_ctor: RecursiveCtorSync<'b, C, O, H> = Arc::new(Mutex::new(None));
let r_ctor_clone = r_ctor.clone();
let ctor = handler(r_ctor_clone);
*r_ctor.lock().unwrap() = Some(Adapter::dyn_box_sync(ctor));
r_ctor
}
pub trait RecursiveParserSync<'c, C>
where
C: Context<'c>,
{
type Ctor<'b, Ctx, O, H>;
fn build_with<'b, O, I, H, F>(func: F) -> Self::Ctor<'b, C, O, H>
where
H: Handler<C>,
I: Ctor<C, O, H> + Send + Sync + 'b,
F: FnMut(Self::Ctor<'b, C, O, H>) -> I;
fn build<'b, O, I, H, F>(func: F) -> Self::Ctor<'b, C, O, H>
where
H: Handler<C>,
I: Ctor<C, O, H> + Send + Sync + 'b,
F: FnMut(Self::Ctor<'b, C, O, H>) -> I,
{
Self::build_with(func)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct RecParserSync;
impl<'c, Ctx> RecursiveParserSync<'c, Ctx> for RecParserSync
where
Ctx: Context<'c> + Match<'c>,
{
type Ctor<'b, C, O, H> = RecursiveCtorSync<'b, C, O, H>;
fn build_with<'b, O, I, H, F>(func: F) -> Self::Ctor<'b, Ctx, O, H>
where
H: Handler<Ctx>,
I: Ctor<Ctx, O, H> + Send + Sync + 'b,
F: FnMut(Self::Ctor<'b, Ctx, O, H>) -> I,
{
rec_parser_sync(func)
}
}
}
#[cfg(feature = "alloc")]
mod rec_unsync {
use crate::alloc::Box;
use crate::alloc::Rc;
use crate::ctor::Adapter;
use crate::ctor::Ctor;
use crate::ctor::Handler;
use crate::ctx::Context;
use crate::ctx::Match;
use core::cell::RefCell;
pub type RecursiveCtor<'b, C, O, H> =
Rc<RefCell<Option<Adapter<C, Box<dyn Ctor<C, O, H> + 'b>>>>>;
///
/// # Example
///
/// ```
/// # use neure::{err::Error, prelude::*};
/// #
/// # fn main() -> color_eyre::Result<()> {
/// # color_eyre::install()?;
/// #[derive(Debug, PartialEq, Eq)]
/// enum Xml {
/// Element { name: String, child: Vec<Xml> },
/// Enclose(String),
/// }
///
/// let xml = regex::rec_parser(|ctor| {
/// let alpha = neu::alphabetic()
/// .many0()
/// .map(|v: &str| v.to_string());
/// let s = alpha.enclose("<", ">");
/// let e = alpha.enclose("</", ">");
/// let c = alpha.enclose("<", "/>").map(Xml::Enclose);
/// let m = |((l, c), r): ((String, Vec<Xml>), String)| {
/// if l != r {
/// Err(Error::Uid(0))
/// } else {
/// Ok(Xml::Element { name: l, child: c })
/// }
/// };
///
/// s.then(ctor.clone()).then(e).try_map(m).or(c).repeat(1..)
/// });
/// let ret = CharsCtx::new("<language><rust><linux/></rust><cpp><windows/></cpp></language>")
/// .ctor(&xml)?;
/// let chk = vec![Xml::Element {
/// name: "language".to_owned(),
/// child: vec![
/// Xml::Element {
/// name: "rust".to_owned(),
/// child: vec![Xml::Enclose("linux".to_owned())],
/// },
/// Xml::Element {
/// name: "cpp".to_owned(),
/// child: vec![Xml::Enclose("windows".to_owned())],
/// },
/// ],
/// }];
///
/// assert_eq!(ret, chk);
/// Ok(())
/// # }
/// ```
pub fn rec_parser<'a, 'b, C, O, H, I>(
mut handler: impl FnMut(RecursiveCtor<'b, C, O, H>) -> I,
) -> RecursiveCtor<'b, C, O, H>
where
C: Match<'a>,
H: Handler<C>,
I: Ctor<C, O, H> + 'b,
{
let r_ctor: RecursiveCtor<C, O, H> = Rc::new(RefCell::new(None));
let r_ctor_clone = r_ctor.clone();
let ctor = handler(r_ctor_clone);
*r_ctor.borrow_mut() = Some(Adapter::dyn_box(ctor));
r_ctor
}
pub trait RecursiveParser<'c, C>
where
C: Match<'c>,
{
type Ctor<'b, Ctx, O, H>;
fn build<'b, O, I, H, F>(func: F) -> Self::Ctor<'b, C, O, H>
where
H: Handler<C>,
I: Ctor<C, O, H> + 'b,
F: FnMut(Self::Ctor<'b, C, O, H>) -> I;
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct RecParser;
impl<'c, C> RecursiveParser<'c, C> for RecParser
where
C: Context<'c> + Match<'c>,
{
type Ctor<'b, Ctx, O, H> = RecursiveCtor<'b, Ctx, O, H>;
fn build<'b, O, I, H, F>(func: F) -> Self::Ctor<'b, C, O, H>
where
H: Handler<C>,
I: Ctor<C, O, H> + 'b,
F: FnMut(Self::Ctor<'b, C, O, H>) -> I,
{
rec_parser(func)
}
}
}
#[cfg(feature = "std")]
pub use rec_sync::*;
#[cfg(feature = "alloc")]
pub use rec_unsync::*;