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//! Items which do not have a correspondence to any API in the proc_macro crate,
//! but are necessary to include in proc-macro2.

use crate::fallback;
use crate::imp;
use crate::marker::Marker;
use crate::Span;
use core::fmt::{self, Debug};

/// An object that holds a [`Group`]'s `span_open()` and `span_close()` together
/// (in a more compact representation than holding those 2 spans individually.
///
/// [`Group`]: crate::Group
#[derive(Copy, Clone)]
pub struct DelimSpan {
    inner: DelimSpanEnum,
    _marker: Marker,
}

#[derive(Copy, Clone)]
enum DelimSpanEnum {
    #[cfg(wrap_proc_macro)]
    Compiler {
        join: proc_macro::Span,
        open: proc_macro::Span,
        close: proc_macro::Span,
    },
    Fallback(fallback::Span),
}

impl DelimSpan {
    pub(crate) fn new(group: &imp::Group) -> Self {
        #[cfg(wrap_proc_macro)]
        let inner = match group {
            imp::Group::Compiler(group) => DelimSpanEnum::Compiler {
                join: group.span(),
                open: group.span_open(),
                close: group.span_close(),
            },
            imp::Group::Fallback(group) => DelimSpanEnum::Fallback(group.span()),
        };

        #[cfg(not(wrap_proc_macro))]
        let inner = DelimSpanEnum::Fallback(group.span());

        DelimSpan {
            inner,
            _marker: Marker,
        }
    }

    /// Returns a span covering the entire delimited group.
    pub fn join(&self) -> Span {
        match &self.inner {
            #[cfg(wrap_proc_macro)]
            DelimSpanEnum::Compiler { join, .. } => Span::_new(imp::Span::Compiler(*join)),
            DelimSpanEnum::Fallback(span) => Span::_new_fallback(*span),
        }
    }

    /// Returns a span for the opening punctuation of the group only.
    pub fn open(&self) -> Span {
        match &self.inner {
            #[cfg(wrap_proc_macro)]
            DelimSpanEnum::Compiler { open, .. } => Span::_new(imp::Span::Compiler(*open)),
            DelimSpanEnum::Fallback(span) => Span::_new_fallback(span.first_byte()),
        }
    }

    /// Returns a span for the closing punctuation of the group only.
    pub fn close(&self) -> Span {
        match &self.inner {
            #[cfg(wrap_proc_macro)]
            DelimSpanEnum::Compiler { close, .. } => Span::_new(imp::Span::Compiler(*close)),
            DelimSpanEnum::Fallback(span) => Span::_new_fallback(span.last_byte()),
        }
    }
}

impl Debug for DelimSpan {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        Debug::fmt(&self.join(), f)
    }
}