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// Copyright 2017, Igor Shaula
// Licensed under the MIT License <LICENSE or
// http://opensource.org/licenses/MIT>. This file
// may not be copied, modified, or distributed
// except according to those terms.
use std::io;
use std::fmt;
use std::error::Error;
use winapi::shared::minwindef::DWORD;
use super::RegKey;
use super::enums::*;
use super::transaction::Transaction;
use self::EncoderState::*;
macro_rules! emit_value{
($s:ident, $v:ident) => (
match mem::replace(&mut $s.state, Start) {
NextKey(ref s) => {
$s.keys[$s.keys.len()-1].set_value(s, &$v)
.map_err(EncoderError::IoError)
},
Start => Err(EncoderError::NoFieldName)
}
)
}
macro_rules! no_impl {
($e:expr) => (
Err(EncoderError::EncodeNotImplemented($e.to_owned()))
)
}
#[cfg(feature = "serialization-serde")] mod serialization_serde;
#[derive(Debug)]
pub enum EncoderError{
EncodeNotImplemented(String),
SerializerError(String),
IoError(io::Error),
NoFieldName,
}
impl fmt::Display for EncoderError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl Error for EncoderError {
fn description(&self) -> &str {
use self::EncoderError::*;
match *self {
EncodeNotImplemented(ref s) | SerializerError(ref s) => s,
IoError(ref e) => e.description(),
NoFieldName => "No field name"
}
}
}
pub type EncodeResult<T> = Result<T, EncoderError>;
impl From<io::Error> for EncoderError {
fn from(err: io::Error) -> EncoderError {
EncoderError::IoError(err)
}
}
#[derive(Debug)]
enum EncoderState {
Start,
NextKey(String),
// NextMapKey,
}
#[derive(Debug)]
pub struct Encoder {
keys: Vec<RegKey>,
tr: Transaction,
state: EncoderState,
}
const ENCODER_SAM: DWORD = KEY_CREATE_SUB_KEY|KEY_SET_VALUE;
impl Encoder {
pub fn from_key(key: &RegKey) -> EncodeResult<Encoder> {
let tr = try!(Transaction::new());
key.open_subkey_transacted_with_flags("", &tr, ENCODER_SAM)
.map(|k| Encoder::new(k, tr))
.map_err(EncoderError::IoError)
}
fn new(key: RegKey, tr: Transaction) -> Encoder {
let mut keys = Vec::with_capacity(5);
keys.push(key);
Encoder{
keys: keys,
tr: tr,
state: Start,
}
}
pub fn commit(&mut self) -> EncodeResult<()> {
self.tr.commit().map_err(EncoderError::IoError)
}
}
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