syn-solidity 1.5.7

syn-powered Solidity parser
Documentation 
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use crate::Spanned;
use proc_macro2::Span;
use syn::{
    Result, Token,
    parse::{Parse, ParseStream},
};

/// Represents the walrus operator `:=`.
#[derive(Clone, Debug)]
pub struct WalrusToken {
    pub colon: Token![:],
    pub equals: Token![=],
}

impl Parse for WalrusToken {
    fn parse(input: ParseStream<'_>) -> Result<Self> {
        let colon = input.parse()?;
        let equals = input.parse()?;

        Ok(Self { colon, equals })
    }
}

impl Spanned for WalrusToken {
    fn span(&self) -> Span {
        self.colon.span().join(self.equals.span()).unwrap_or(self.colon.span())
    }

    fn set_span(&mut self, span: Span) {
        self.colon.set_span(span);
        self.equals.set_span(span);
    }
}