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