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/*
* meli - melib crate.
*
* Copyright 2017-2020 Manos Pitsidianakis
*
* This file is part of meli.
*
* meli is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* meli is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with meli. If not, see <http://www.gnu.org/licenses/>.
*/
use super::*;
use crate::email::parser::IResult;
use nom::{
bytes::complete::{is_not, tag},
combinator::opt,
};
use std::str::FromStr;
pub struct NntpLineIterator<'a> {
slice: &'a str,
}
impl<'a> std::iter::DoubleEndedIterator for NntpLineIterator<'a> {
fn next_back(&mut self) -> Option<Self::Item> {
if self.slice.is_empty() {
None
} else if let Some(pos) = self.slice.rfind("\r\n") {
if self.slice[..pos].is_empty() {
self.slice = &self.slice[..pos];
None
} else if let Some(prev_pos) = self.slice[..pos].rfind("\r\n") {
let ret = &self.slice[prev_pos + 2..pos + 2];
self.slice = &self.slice[..prev_pos + 2];
Some(ret)
} else {
let ret = self.slice;
self.slice = &self.slice[ret.len()..];
Some(ret)
}
} else {
let ret = self.slice;
self.slice = &self.slice[ret.len()..];
Some(ret)
}
}
}
impl<'a> Iterator for NntpLineIterator<'a> {
type Item = &'a str;
fn next(&mut self) -> Option<&'a str> {
if self.slice.is_empty() {
None
} else if let Some(pos) = self.slice.find("\r\n") {
let ret = &self.slice[..pos + 2];
self.slice = &self.slice[pos + 2..];
Some(ret)
} else {
let ret = self.slice;
self.slice = &self.slice[ret.len()..];
Some(ret)
}
}
}
pub trait NntpLineSplit {
fn split_rn(&self) -> NntpLineIterator;
}
impl NntpLineSplit for str {
fn split_rn(&self) -> NntpLineIterator {
NntpLineIterator { slice: self }
}
}
pub fn over_article(input: &str) -> IResult<&str, (UID, Envelope)> {
/*
"0" or article number (see below)
Subject header content
From header content
Date header content
Message-ID header content
References header content
:bytes metadata item
:lines metadata item
*/
let (input, num) = is_not("\t")(input)?;
let (input, _) = tag("\t")(input)?;
let (input, subject) = opt(is_not("\t"))(input)?;
let (input, _) = tag("\t")(input)?;
let (input, from) = opt(is_not("\t"))(input)?;
let (input, _) = tag("\t")(input)?;
let (input, date) = opt(is_not("\t"))(input)?;
let (input, _) = tag("\t")(input)?;
let (input, message_id) = opt(is_not("\t"))(input)?;
let (input, _) = tag("\t")(input)?;
let (input, references) = opt(is_not("\t"))(input)?;
let (input, _) = tag("\t")(input)?;
let (input, _bytes) = opt(is_not("\t"))(input)?;
let (input, _) = tag("\t")(input)?;
let (input, _lines) = opt(is_not("\t\r\n"))(input)?;
let (input, _other_headers) = opt(is_not("\r\n"))(input)?;
let (input, _) = tag("\r\n")(input)?;
Ok((
input,
({
let env_hash = {
let mut hasher = DefaultHasher::new();
hasher.write(num.as_bytes());
hasher.write(message_id.unwrap_or_default().as_bytes());
hasher.finish()
};
let mut env = Envelope::new(env_hash);
if let Some(date) = date {
env.set_date(date.as_bytes());
if let Ok(d) =
crate::email::parser::dates::rfc5322_date(env.date_as_str().as_bytes())
{
env.set_datetime(d);
}
}
if let Some(subject) = subject {
env.set_subject(subject.into());
}
if let Some(from) = from {
if let Ok((_, from)) =
crate::email::parser::address::rfc2822address_list(from.as_bytes())
{
env.set_from(from);
}
}
if let Some(references) = references {
env.set_references(references.as_bytes());
}
if let Some(message_id) = message_id {
env.set_message_id(message_id.as_bytes());
}
(usize::from_str(num).unwrap(), env)
}),
))
}