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use std::io;
use std::convert::TryFrom;
use std::str::{from_utf8, Utf8Error};
use std::borrow::Borrow;
use crate::seq::{IV, Version, VersionDecodeError, IVMeta, BPMTable};
use quick_xml::events::{Event, BytesStart};
struct State<'s, B: io::BufRead> {
iv: &'s mut IV,
rdr: &'s mut quick_xml::Reader<B>,
}
#[derive(Debug)]
pub enum Error {
QXML(quick_xml::Error),
VersionDecodeError,
UTF8(Utf8Error),
Unexpected { scope: Scope, event: String },
}
#[derive(Debug, Clone, Copy, Hash)]
pub enum Scope {
TopLevel,
}
impl From<quick_xml::Error> for Error {
fn from(t: quick_xml::Error) -> Self {
Error::QXML(t)
}
}
impl From<VersionDecodeError> for Error {
fn from(v: VersionDecodeError) -> Self {
Error::VersionDecodeError
}
}
impl From<Utf8Error> for Error {
fn from(e: Utf8Error) -> Self {
Error::UTF8(e)
}
}
pub fn read<R: io::Read>(source: R) -> Result<IV, Error> {
let mut output: IV = Default::default();
let mut reader = quick_xml::Reader::from_reader(
io::BufReader::new(source)
);
let mut state = State {
iv: &mut output,
rdr: &mut reader,
};
read_toplevel(&mut state)?;
Ok(output)
}
const IV_NAME: &[u8] = b"iv";
const IV_VERSION: &[u8] = b"version";
const IV_SOURCE: &[u8] = b"src";
fn read_toplevel<'s, B: io::BufRead>(state: &mut State<'s, B>) -> Result<(), Error> {
let mut buffer: Vec<u8> = Vec::new();
loop {
match state.rdr.read_event(&mut buffer)? {
Event::Decl(_) => (), // Don't care
Event::Start(bs) => {
match_iv(state, bs, false);
break;
},
Event::Empty(bs) => {
match_iv(state, bs, true);
break;
},
ev => return Err(Error::Unexpected {
scope: Scope::TopLevel,
event: format!("{:?}", ev),
}),
}
}
Ok(())
}
fn match_iv<'s, 'a, B: io::BufRead>(state: &mut State<'s, B>, bs: BytesStart<'a>, empty: bool) -> Result<(), Error> {
if bs.name() != IV_NAME {
return Err(Error::Unexpected {
scope: Scope::TopLevel,
event: format!("start tag: {:?}", bs.name()),
});
}
for attr in bs.attributes() {
let attr = attr?;
match attr.key {
key if key == IV_VERSION => {
let value = attr.unescaped_value()?;
state.iv.version =
Version::try_from(value.borrow())?;
},
key if key == IV_SOURCE => {
state.iv.source =
Some(from_utf8(
attr.unescaped_value()?.borrow()
)?.into());
},
_ => (),
}
}
if !empty { read_iv(state)?; }
Ok(())
}
const META_NAME: &[u8] = b"meta";
const STREAMS_NAME: &[u8] = b"streams";
fn read_iv<'s, B: io::BufRead>(state: &mut State<'s, B>) -> Result<(), Error> {
let mut buffer: Vec<u8> = Vec::new();
loop {
match state.rdr.read_event(&mut buffer)? {
Event::Start(bs) => {
match_in_iv(state, bs, false);
},
Event::Empty(bs) => {
match_in_iv(state, bs, true);
},
Event::End(be) => {
if be.name() == IV_NAME {
break;
}
},
_ => (),
}
}
Ok(())
}
fn read_until<'s, B: io::BufRead>(state: &mut State<'s, B>, name: &[u8]) -> Result<(), Error> {
let mut buffer: Vec<u8> = Vec::new();
loop {
match state.rdr.read_event(&mut buffer)? {
Event::End(be) => {
if be.name() == name {
return Ok(());
}
}
_ => (),
}
}
}
fn match_in_iv<'s, 'a, B: io::BufRead>(state: &mut State<'s, B>, bs: BytesStart<'a>, empty: bool) -> Result<(), Error> {
match bs.name() {
nm if nm == META_NAME => {
if !empty { read_meta(state)?; }
},
nm if nm == STREAMS_NAME => {
if !empty { read_streams(state)?; }
},
nm => {
if !empty { read_until(state, nm.borrow())?; }
}
}
Ok(())
}
fn read_meta<'s, B: io::BufRead>(state: &mut State<'s, B>) -> Result<(), Error> {
todo!()
}
fn read_streams<'s, B: io::BufRead>(state: &mut State<'s, B>) -> Result<(), Error> {
todo!()
}
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