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// Copyright 2017, Igor Shaula
// Licensed under the MIT License <LICENSE or
// may not be copied, modified, or distributed
// except according to those terms.
use self::EncoderState::*;
use super::enums::*;
use super::transaction::Transaction;
use super::RegKey;
use std::error::Error;
use std::fmt;
use std::io;
use winapi::shared::minwindef::DWORD;
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,
KeyMustBeAString,
}
impl fmt::Display for EncoderError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl Error for EncoderError {}
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 = 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,
tr,
state: Start,
}
}
pub fn commit(&mut self) -> EncodeResult<()> {
self.tr.commit().map_err(EncoderError::IoError)
}
}