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use std::collections::HashMap;
use std::fs::File;
use std::io::Read;
use roxmltree::{Document, Node};
pub struct Epub {
container: zip::ZipArchive<File>,
pub nav: Vec<String>,
pub pages: Vec<Vec<String>>,
}
impl Epub {
pub fn new(path: &str) -> std::io::Result<Self> {
let file = File::open(path)?;
let mut epub = Epub {
container: zip::ZipArchive::new(file)?,
nav: Vec::new(),
pages: Vec::new(),
};
let nav = epub.get_nav();
epub.nav.reserve_exact(nav.len());
epub.pages.reserve_exact(nav.len());
for (path, label) in nav {
epub.nav.push(label);
let xml = epub.get_text(&path);
let doc = Document::parse(&xml).unwrap();
let body = doc.root_element().last_element_child().unwrap();
let mut page = Vec::new();
Epub::render(&mut page, body);
epub.pages.push(page);
}
Ok(epub)
}
fn render(buf: &mut Vec<String>, n: Node) {
if n.is_text() {
let text = n.text().unwrap();
if !text.trim().is_empty() {
let last = buf.last_mut().unwrap();
last.push_str(text);
}
return;
}
match n.tag_name().name() {
"h1" | "h2" | "h3" | "h4" | "h5" | "h6" => {
buf.push(String::from("\x1b\x5b1m"));
for c in n.children() {
Self::render(buf, c);
}
buf.push(String::from("\x1b\x5b0m"));
}
"blockquote" | "p" => {
buf.push(String::new());
for c in n.children() {
Self::render(buf, c);
}
buf.push(String::new());
}
"li" => {
buf.push(String::from("- "));
for c in n.children() {
Self::render(buf, c);
}
buf.push(String::new());
}
"br" => buf.push(String::new()),
_ => {
for c in n.children() {
Self::render(buf, c);
}
}
}
}
fn get_text(&mut self, name: &str) -> String {
let mut text = String::new();
self.container
.by_name(name)
.unwrap()
.read_to_string(&mut text)
.unwrap();
text
}
fn get_nav(&mut self) -> Vec<(String, String)> {
let xml = self.get_text("META-INF/container.xml");
let doc = Document::parse(&xml).unwrap();
let path = doc
.descendants()
.find(|n| n.has_tag_name("rootfile"))
.unwrap()
.attribute("full-path")
.unwrap();
let xml = self.get_text(path);
let doc = Document::parse(&xml).unwrap();
let rootdir = std::path::Path::new(&path).parent().unwrap();
let mut manifest = HashMap::new();
doc.root_element()
.children()
.find(|n| n.has_tag_name("manifest"))
.unwrap()
.children()
.filter(Node::is_element)
.for_each(|n| {
manifest.insert(n.attribute("id").unwrap(), n.attribute("href").unwrap());
});
// TODO check if epub3 nav is reliable w/o spine
let mut nav = HashMap::new();
if doc.root_element().attribute("version") == Some("3.0") {
let path = doc
.root_element()
.children()
.find(|n| n.has_tag_name("manifest"))
.unwrap()
.children()
.find(|n| n.attribute("properties") == Some("nav"))
.unwrap()
.attribute("href")
.unwrap();
let xml = self.get_text(rootdir.join(path).to_str().unwrap());
let doc = Document::parse(&xml).unwrap();
doc.descendants()
.find(|n| n.has_tag_name("nav"))
.unwrap()
.descendants()
.filter(|n| n.has_tag_name("a"))
.for_each(|n| {
let path = n.attribute("href").unwrap().to_string();
let text = n
.descendants()
.filter(Node::is_text)
.map(|n| n.text().unwrap())
.collect();
nav.insert(path, text);
})
} else {
let path = manifest.get("ncx").unwrap();
let xml = self.get_text(rootdir.join(path).to_str().unwrap());
let doc = Document::parse(&xml).unwrap();
doc.descendants()
.find(|n| n.has_tag_name("navMap"))
.unwrap()
.descendants()
.filter(|n| n.has_tag_name("navPoint"))
.for_each(|n| {
let path = n
.descendants()
.find(|n| n.has_tag_name("content"))
.unwrap()
.attribute("src")
.unwrap()
.to_string();
let text = n
.descendants()
.find(|n| n.has_tag_name("text"))
.unwrap()
.text()
.unwrap()
.to_string();
nav.insert(path, text);
})
}
doc.root_element()
.children()
.find(|n| n.has_tag_name("spine"))
.unwrap()
.children()
.filter(Node::is_element)
.enumerate()
.map(|(i, n)| {
let id = n.attribute("idref").unwrap();
let path = manifest.remove(id).unwrap();
let label = nav.remove(path).unwrap_or_else(|| i.to_string());
let path = rootdir.join(path).to_str().unwrap().to_string();
(path, label)
})
.collect()
}
}
#[test]
fn test_dir() {
let path = "/mnt/lit/read";
for entry in std::fs::read_dir(path).unwrap() {
let path = entry.unwrap().path();
let s = path.to_str().unwrap();
println!("testing: {}", s);
Epub::new(s).unwrap();
}
}
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