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// Copyright 2015 Till Höppner
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::io::{ BufRead, Write };
use std::borrow::ToOwned;
use std::iter::{ Iterator };
use event::{ Event, rejoin };
use context::Context;
use format::{ Encode, Decode };
use l::LogLevel::Info;
use chrono::*;
pub struct Energymech;
static TIME_FORMAT: &'static str = "%H:%M:%S";
pub struct Iter<'a, R: 'a> where R: BufRead {
context: &'a Context,
input: R,
buffer: String
}
impl<'a, R: 'a> Iterator for Iter<'a, R> where R: BufRead {
type Item = ::Result<Event<'a>>;
fn next(&mut self) -> Option<::Result<Event<'a>>> {
fn timestamp(context: &Context, time: &str) -> i64 {
context.timezone.from_local_date(&context.override_date)
.and_time(NaiveTime::from_hms(time[0..2].parse::<u32>().unwrap(),
time[3..5].parse::<u32>().unwrap(),
time[6..8].parse::<u32>().unwrap()))
.single()
.expect("Transformed log times can't be represented, due to timezone transitions")
.timestamp()
}
fn join(s: &[&str], splits: &[char]) -> String {
let len = s.iter().map(|s| s.len()).sum();
let mut out = s.iter().zip(splits.iter()).fold(String::with_capacity(len),
|mut s, (b, &split)| { s.push_str(b); s.push(split); s });
out.pop(); out
}
fn mask(s: &str) -> String {
if s.len() >= 2 { s[1..(s.len() - 1)].to_owned() } else { String::new() }
}
loop {
self.buffer.clear();
match self.input.read_line(&mut self.buffer) {
Ok(0) | Err(_) => return None,
Ok(_) => ()
}
let mut split_tokens: Vec<char> = Vec::new();
let tokens = self.buffer.split( |c: char| {
if c.is_whitespace() { split_tokens.push(c); true } else { false }
}).collect::<Vec<_>>();
if log_enabled!(Info) {
info!("Original: `{}`", self.buffer);
info!("Parsing: {:?}", tokens);
}
match tokens[..tokens.len() - 1].as_ref() {
[time, "*", nick, content..] => return Some(Ok(Event::Action {
from: nick.to_owned(), content: join(content, &split_tokens[3..]),
time: timestamp(&self.context, &mask(time))
})),
[time, "***", old, "is", "now", "known", "as", new] => return Some(Ok(Event::Nick {
old: old.to_owned(), new: new.to_owned(),
time: timestamp(&self.context, &mask(time))
})),
[time, "***", "Joins:", nick, host] => return Some(Ok(Event::Join {
nick: nick.to_owned(), mask: mask(host)
})),
[time, "***", "Quits:", nick, host, reason..] => return Some(Ok(Event::Quit {
nick: nick.to_owned(), mask: mask(host),
reason: mask(&join(reason, &split_tokens[5..])),
time: timestamp(&self.context, &mask(time))
})),
[time, nick, content..]
if nick.starts_with('<') && nick.ends_with('>')
=> return Some(Ok(Event::Msg {
from: mask(nick), content: join(content, &split_tokens[2..]),
time: timestamp(&self.context, &mask(time))
})),
_ => ()
}
}
}
}
impl<'a, R: 'a> Decode<'a, R, Iter<'a, R>> for Energymech where R: BufRead {
fn decode(&'a mut self, context: &'a Context, input: R) -> Iter<R> {
Iter {
context: context,
input: input,
buffer: String::new()
}
}
}
impl<'a, W> Encode<'a, W> for Energymech where W: Write {
fn encode(&'a self, context: &'a Context, mut output: W, event: &'a Event) -> ::Result<()> {
fn date(t: i64) -> String {
format!("[{}]", UTC.timestamp(t, 0).format(TIME_FORMAT))
}
match event {
&Event::Msg { ref from, ref content, ref time } => {
try!(writeln!(&mut output, "{} <{}> {}", date(*time), from, content))
},
&Event::Action { ref from, ref content, ref time } => {
try!(writeln!(&mut output, "{} * {} {}", date(*time), from, content))
},
&Event::Nick { ref old, ref new, ref time } => {
try!(writeln!(&mut output, "{} *** {} is now known as {}", date(*time), old, new))
},
&Event::Quit { ref nick, ref mask, ref reason, ref time } => {
try!(writeln!(&mut output, "{} *** Quits: {} ({}) ({})", date(*time), nick, mask, reason))
},
_ => ()
}
Ok(())
}
}
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