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115 lines
3.4 KiB
Rust
115 lines
3.4 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::convert::TryInto;
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use std::fmt;
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use Span;
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/// Describes the context of a [`Punct`] relatively to the next token.
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#[repr(C)]
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum Spacing {
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/// A [`Punct`] is not immediately followed by another `Punct`.
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Alone,
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/// A [`Punct`] is immediately followed by another `Punct` and can be
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/// combined into a multi-character operator.
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Joint,
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}
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/// Single punctuation character such as `+`, `-` or `#`.
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///
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/// Multi-character operators like `+=` are represented as two instances of
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/// `Punct` with different forms of `Spacing` returned.
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#[derive(Clone)]
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pub struct Punct(pub(crate) bridge::punct::Punct);
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impl Punct {
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/// Creates a new `Punct` from a given character and spacing.
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///
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/// # Arguments
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///
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/// * `ch` - The punctuation character.
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/// * `spacing` - The link between this character and the next one.
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///
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/// # Panics
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///
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/// This function will panic if the `ch` argument is not a valid
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/// punctuation character allowed by the language.
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pub fn new(ch: char, spacing: Spacing) -> Self {
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Punct(bridge::punct::Punct::new(ch, spacing))
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}
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/// Get the value for this punctuation character as `char`.
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pub fn as_char(&self) -> char {
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self.0
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.ch
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.try_into()
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.expect("Cannot convert from u32 to char")
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}
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/// Get the [`Spacing`] of this punctuation character, indicating whether
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/// the following character can be combined into a multi-character operator
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/// or not.
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pub fn spacing(&self) -> Spacing {
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self.0.spacing
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}
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/// Get the [`Span`] for this punctuation character.
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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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/// Set the span for this punctuation character.
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///
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/// # Arguments
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///
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/// * `span` - The new span value.
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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 Punct {
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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 Punct {
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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 PartialEq<char> for Punct {
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fn eq(&self, rhs: &char) -> bool {
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self.as_char() == *rhs
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}
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}
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impl PartialEq<Punct> for char {
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fn eq(&self, rhs: &Punct) -> bool {
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*self == rhs.as_char()
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}
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}
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