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111 lines
3.3 KiB
Rust
111 lines
3.3 KiB
Rust
// Copyright (C) 2023-2024 Free Software Foundation, Inc.
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//
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// This file is part of the GNU Proc Macro Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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use bridge;
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use std::fmt;
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use Span;
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use TokenStream;
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/// Describes how a sequence of token trees is delimited.
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#[repr(C)]
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum Delimiter {
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/// The sequence is delimited by a parenthesis `(...)`.
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Parenthesis,
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/// The sequence is delimited by a brace `{...}`.
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Brace,
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/// The sequence is delimited by a bracket `[...]`.
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Bracket,
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/// Invisible delimiter to preserve operator priority.
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None,
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}
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/// A delimited token stream.
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#[derive(Clone)]
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pub struct Group(pub(crate) bridge::group::Group);
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impl Group {
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/// Creates a new `Group`.
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///
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/// # Arguments
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///
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/// * `delimiter` - The delimiter surrounding the inner [`TokenStream`].
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/// * `stream` - The tokenstream for this `Group`.
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pub fn new(delimiter: Delimiter, stream: TokenStream) -> Self {
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Group(bridge::group::Group::new(delimiter, stream.0))
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}
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/// Get the delimiter of the `Group`.
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pub fn delimiter(&self) -> Delimiter {
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self.0.delimiter()
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}
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/// Get the stream of the `Group`.
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///
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/// # Note
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///
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/// The returned stream does not include the delimiters of this group.
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pub fn stream(&self) -> TokenStream {
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TokenStream(self.0.stream())
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}
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/// Get the span for the delimiters of this token stream, spanning the
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/// entire group.
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pub fn span(&self) -> Span {
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Span(self.0.span())
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}
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/// Get the span pointing to the opening delimiter of this `Group`.
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pub fn span_open(&self) -> Span {
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Span(self.0.span())
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}
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/// Get the span pointing to the closing delimiter of this `Group`.
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pub fn span_close(&self) -> Span {
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Span(self.0.span())
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}
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/// Change the span for this `Group`'s delimiters, but not its internal
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/// tokens.
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///
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/// # Note
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///
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/// This method will **not** set the span of all the internal tokens spanned
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/// by this group, but rather it will only set the span of the delimiter
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/// tokens at the level of the `Group`.
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pub fn set_span(&mut self, span: Span) {
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self.0.set_span(span.0)
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}
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}
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impl fmt::Display for Group {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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self.0.fmt(f)
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}
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}
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impl fmt::Debug for Group {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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self.0.fmt(f)
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}
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}
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