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use std::ffi::OsStr;
use std::io::Write;
use tectonic_xdv::{FileType, XdvEvents, XdvParser};
use super::IoEventBackend;
use crate::errors::{Error, Result};
use crate::io::{IoProvider, IoStack, OpenResult, OutputHandle};
use crate::status::StatusBackend;
use crate::{errmsg, tt_warning};
#[derive(Default)]
pub struct Spx2HtmlEngine {}
impl Spx2HtmlEngine {
pub fn new() -> Spx2HtmlEngine {
Default::default()
}
pub fn process(
&mut self,
io: &mut IoStack,
events: &mut dyn IoEventBackend,
status: &mut dyn StatusBackend,
spx: &str,
) -> Result<()> {
let mut input = io.input_open_name(OsStr::new(spx), status).must_exist()?;
events.input_opened(input.name(), input.origin());
let outname = {
let mut s = spx.to_owned();
if spx.ends_with(".spx") {
let l = s.len();
s.split_off(l - 4);
}
s.push_str(".html");
s
};
{
let state = State::new(outname, io, events, status);
let (state, _n_bytes) = XdvParser::process(&mut input, state)?;
state.finished();
}
let (name, digest_opt) = input.into_name_digest();
events.input_closed(name, digest_opt);
Ok(())
}
}
struct State<'a, 'b: 'a> {
outname: String,
io: &'a mut IoStack<'b>,
events: &'a mut dyn IoEventBackend,
status: &'a mut dyn StatusBackend,
cur_output: Option<OutputHandle>,
warned_lost_chars: bool,
buf: Vec<u8>,
}
impl<'a, 'b: 'a> State<'a, 'b> {
pub fn new(
outname: String,
io: &'a mut IoStack<'b>,
events: &'a mut dyn IoEventBackend,
status: &'a mut dyn StatusBackend,
) -> Self {
Self {
outname,
io,
events,
status,
cur_output: None,
warned_lost_chars: false,
buf: Vec::new(),
}
}
}
#[inline(always)]
fn as_printable_ascii(c: i32) -> Option<u8> {
if c > 0x20 && c < 0x7F {
Some(c as u8)
} else {
None
}
}
impl<'a, 'b: 'a> State<'a, 'b> {
pub fn finished(self) {
if let Some(oh) = self.cur_output {
let (name, digest) = oh.into_name_digest();
self.events.output_closed(name, digest);
}
}
}
impl<'a, 'b: 'a> XdvEvents for State<'a, 'b> {
type Error = Error;
fn handle_header(&mut self, filetype: FileType, _comment: &[u8]) -> Result<()> {
if filetype != FileType::Spx {
return Err(errmsg!("file should be SPX format but got {}", filetype));
}
self.cur_output = Some(match self.io.output_open_name(OsStr::new(&self.outname)) {
OpenResult::Ok(h) => h,
OpenResult::NotAvailable => {
return Err(errmsg!("no way to write output file \"{}\"", self.outname));
}
OpenResult::Err(e) => {
return Err(e);
}
});
self.events.output_opened(OsStr::new(&self.outname));
Ok(())
}
fn handle_char_run(&mut self, chars: &[i32]) -> Result<()> {
let dest = match self.cur_output {
Some(ref mut h) => h,
None => {
if !self.warned_lost_chars {
tt_warning!(
self.status,
"losing characters in SPX file: no current output"
);
self.warned_lost_chars = true;
}
return Ok(());
}
};
self.buf.clear();
for c in chars.iter() {
if let Some(b) = as_printable_ascii(*c) {
self.buf.push(b);
}
}
if !self.buf.is_empty() {
self.buf.push(0x0a);
dest.write_all(&self.buf)?;
}
Ok(())
}
}