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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.
//! Traits and structs for conversion between various formats.
//! As the source format may not provide the same information as the
//! target format, all formats must allow for omittable information.
use std::iter;
use std::io::{ BufRead, Write };
use std::borrow::Cow;
use event::Event;
use context::Context;
//pub mod weechat3;
//pub mod energymech;
//pub mod binary;
//pub mod msgpack;
pub trait Encode<'a, W> where W: Write {
fn encode(&'a self, context: &'a Context, output: W, event: &'a Event) -> ::Result<()>;
}
pub trait Decode<'a, 'b, 'c> {
fn decode(&'a mut self, context: &'b Context, input: &'c mut BufRead) -> Box<Iterator<Item = ::Result<Event<'a>>> + 'a>;
}
pub struct Dummy;
impl <'a, 'b, 'c> Decode<'a, 'b, 'c> for Dummy {
fn decode(&'a mut self, _context: &'b Context, _input: &'c mut BufRead) -> Box<Iterator<Item = ::Result<Event<'a>>> + 'a> {
Box::new(iter::empty())
}
}
pub fn decoder<'a, 'b, 'c>(format: &str) -> Option<Box<Decode<'a, 'b, 'c>>> {
match format {
// "energymech" => Some(Box::new(energymech::Energymech)),
// "weechat3" => Some(Box::new(weechat3::Weechat3)),
// "binary" => Some(Box::new(binary::Binary)),
// "msgpack" => Some(Box::new(msgpack::Msgpack)),
_ => None
}
}
pub fn encoder<'a, 'b: 'a>(format: &str) -> Option<Box<Encode<'a, &'b mut Write>>> {
match format {
// "energymech" => Some(Box::new(energymech::Energymech)),
// "weechat3" => Some(Box::new(weechat3::Weechat3)),
// "binary" => Some(Box::new(binary::Binary)),
// "msgpack" => Some(Box::new(msgpack::Msgpack)),
_ => None
}
}
fn rejoin(s: &[&str], splits: &[char]) -> Cow<'static, str> {
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(); Cow::Owned(out)
}
fn strip_one(s: &str) -> String {
if s.len() >= 2 { s[1..(s.len() - 1)].to_owned() } else { String::new() }
}
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