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use std::iter::Peekable;
use proc_macro::{token_stream, Ident, Span, TokenTree};
use crate::date::Date;
use crate::error::Error;
use crate::offset::Offset;
use crate::time::Time;
use crate::to_tokens::ToTokenTree;
use crate::{date, offset, time};
pub(crate) struct DateTime {
date: Date,
time: Time,
offset: Option<Offset>,
}
pub(crate) fn parse(chars: &mut Peekable<token_stream::IntoIter>) -> Result<DateTime, Error> {
let date = date::parse(chars)?;
let time = time::parse(chars)?;
let offset = match offset::parse(chars) {
Ok(offset) => Some(offset),
Err(Error::UnexpectedEndOfInput | Error::MissingComponent { name: "sign", .. }) => None,
Err(err) => return Err(err),
};
if let Some(token) = chars.peek() {
return Err(Error::UnexpectedToken {
tree: token.clone(),
});
}
Ok(DateTime { date, time, offset })
}
impl ToTokenTree for DateTime {
fn into_token_tree(self) -> TokenTree {
let (type_name, maybe_offset) = match self.offset {
Some(offset) => (
Ident::new("OffsetDateTime", Span::mixed_site()),
quote!(.assume_offset(#(offset))),
),
None => (
Ident::new("PrimitiveDateTime", Span::mixed_site()),
quote!(),
),
};
quote_group! {{
const DATE_TIME: ::time::#(type_name) = ::time::PrimitiveDateTime::new(
#(self.date),
#(self.time),
) #S(maybe_offset);
DATE_TIME
}}
}
}