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mod string;
use std::iter::Peekable;
use std::str::FromStr;
use proc_macro::{token_stream, Span, TokenStream, TokenTree};
use crate::Error;
pub(crate) fn get_string_literal(tokens: TokenStream) -> Result<(Span, Vec<u8>), Error> {
let mut tokens = tokens.into_iter();
match (tokens.next(), tokens.next()) {
(Some(TokenTree::Literal(literal)), None) => string::parse(&literal),
(Some(tree), None) => Err(Error::ExpectedString {
span_start: Some(tree.span()),
span_end: Some(tree.span()),
}),
(_, Some(tree)) => Err(Error::UnexpectedToken { tree }),
(None, None) => Err(Error::ExpectedString {
span_start: None,
span_end: None,
}),
}
}
pub(crate) fn consume_number<T: FromStr>(
component_name: &'static str,
chars: &mut Peekable<token_stream::IntoIter>,
) -> Result<(Span, T), Error> {
let (span, digits) = match chars.next() {
Some(TokenTree::Literal(literal)) => (literal.span(), literal.to_string()),
Some(tree) => return Err(Error::UnexpectedToken { tree }),
None => return Err(Error::UnexpectedEndOfInput),
};
if let Ok(value) = digits.replace('_', "").parse() {
Ok((span, value))
} else {
Err(Error::InvalidComponent {
name: component_name,
value: digits,
span_start: Some(span),
span_end: Some(span),
})
}
}
pub(crate) fn consume_any_ident(
idents: &[&str],
chars: &mut Peekable<token_stream::IntoIter>,
) -> Result<Span, Error> {
match chars.peek() {
Some(TokenTree::Ident(char)) if idents.contains(&char.to_string().as_str()) => {
let ret = Ok(char.span());
drop(chars.next());
ret
}
Some(tree) => Err(Error::UnexpectedToken { tree: tree.clone() }),
None => Err(Error::UnexpectedEndOfInput),
}
}
pub(crate) fn consume_punct(
c: char,
chars: &mut Peekable<token_stream::IntoIter>,
) -> Result<Span, Error> {
match chars.peek() {
Some(TokenTree::Punct(punct)) if *punct == c => {
let ret = Ok(punct.span());
drop(chars.next());
ret
}
Some(tree) => Err(Error::UnexpectedToken { tree: tree.clone() }),
None => Err(Error::UnexpectedEndOfInput),
}
}
fn is_leap_year(year: i32) -> bool {
(year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0))
}
fn jan_weekday(year: i32, ordinal: i32) -> u8 {
macro_rules! div_floor {
($a:expr, $b:expr) => {{
let (_quotient, _remainder) = ($a / $b, $a % $b);
if (_remainder > 0 && $b < 0) || (_remainder < 0 && $b > 0) {
_quotient - 1
} else {
_quotient
}
}};
}
let adj_year = year - 1;
((ordinal + adj_year + div_floor!(adj_year, 4) - div_floor!(adj_year, 100)
+ div_floor!(adj_year, 400)
+ 6)
.rem_euclid(7)) as _
}
pub(crate) fn days_in_year(year: i32) -> u16 {
365 + is_leap_year(year) as u16
}
pub(crate) fn days_in_year_month(year: i32, month: u8) -> u8 {
[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month as usize - 1]
+ (month == 2 && is_leap_year(year)) as u8
}
pub(crate) fn weeks_in_year(year: i32) -> u8 {
52 + (jan_weekday(year, 1) + is_leap_year(year) as u8 == 3) as u8
}
pub(crate) fn ywd_to_yo(year: i32, week: u8, iso_weekday_number: u8) -> (i32, u16) {
let (ordinal, overflow) = (u16::from(week) * 7 + u16::from(iso_weekday_number))
.overflowing_sub(u16::from(jan_weekday(year, 4)) + 4);
if overflow || ordinal == 0 {
return (year - 1, (ordinal.wrapping_add(days_in_year(year - 1))));
}
let days_in_cur_year = days_in_year(year);
if ordinal > days_in_cur_year {
(year + 1, ordinal - days_in_cur_year)
} else {
(year, ordinal)
}
}
pub(crate) fn ymd_to_yo(year: i32, month: u8, day: u8) -> (i32, u16) {
let ordinal = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334][month as usize - 1]
+ (month > 2 && is_leap_year(year)) as u16;
(year, ordinal + u16::from(day))
}
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