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use anyhow::Result;
use crossterm::style::Attribute;
use roxmltree::{Document, Node};
use std::{collections::HashMap, fs::File, io::Read};
type Attrs = Vec<(usize, Attribute)>;
pub struct Epub {
container: zip::ZipArchive<File>,
pub chapters: Vec<(String, String, Attrs)>,
pub meta: String,
}
impl Epub {
pub fn new(path: &str, meta: bool) -> Result<Self> {
let file = File::open(path)?;
let mut epub = Epub {
container: zip::ZipArchive::new(file)?,
chapters: Vec::new(),
meta: String::new(),
};
let chapters = epub.get_rootfile()?;
if !meta {
epub.get_chapters(chapters);
}
Ok(epub)
}
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_chapters(&mut self, chapters: Vec<(String, String)>) {
self.chapters = chapters
.into_iter()
.filter_map(|(title, path)| {
let xml = self.get_text(&path);
// https://github.com/RazrFalcon/roxmltree/issues/12
// UnknownEntityReference for HTML entities
let doc = Document::parse(&xml).unwrap();
let body = doc.root_element().last_element_child().unwrap();
let mut text = String::new();
let mut attrs = vec![(0, Attribute::Reset)];
render(body, &mut text, &mut attrs);
if text.is_empty() {
None
} else {
Some((title, text, attrs))
}
})
.collect();
}
fn get_rootfile(&mut self) -> Result<Vec<(String, String)>> {
let xml = self.get_text("META-INF/container.xml");
let doc = Document::parse(&xml)?;
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)?;
// zip expects unix path even on windows
let rootdir = match path.rfind('/') {
Some(n) => &path[..=n],
None => "",
};
let mut manifest = HashMap::new();
let mut nav = HashMap::new();
let mut children = doc.root_element().children().filter(Node::is_element);
let meta_node = children.next().unwrap();
let manifest_node = children.next().unwrap();
let spine_node = children.next().unwrap();
meta_node
.children()
.filter(Node::is_element)
.for_each(|n| {
let name = n.tag_name().name();
let text = n.text();
if text.is_some() && name != "meta" {
self.meta.push_str(&format!("{}: {}\n", name, text.unwrap()));
}
});
manifest_node
.children()
.filter(Node::is_element)
.for_each(|n| {
manifest.insert(n.attribute("id").unwrap(), n.attribute("href").unwrap());
});
if doc.root_element().attribute("version") == Some("3.0") {
let path = manifest_node
.children()
.find(|n| n.attribute("properties") == Some("nav"))
.unwrap()
.attribute("href")
.unwrap();
let xml = self.get_text(&format!("{}{}", rootdir, path));
let doc = Document::parse(&xml)?;
epub3(doc, &mut nav);
} else {
let toc = spine_node.attribute("toc").unwrap_or("ncx");
let path = manifest.get(toc).unwrap();
let xml = self.get_text(&format!("{}{}", rootdir, path));
let doc = Document::parse(&xml)?;
epub2(doc, &mut nav);
}
Ok(spine_node
.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 = format!("{}{}", rootdir, path);
(label, path)
})
.collect())
}
}
fn render(n: Node, buf: &mut String, attrs: &mut Attrs) {
if n.is_text() {
let text = n.text().unwrap();
if !text.trim().is_empty() {
buf.push_str(text);
}
return;
}
match n.tag_name().name() {
"h1" | "h2" | "h3" | "h4" | "h5" | "h6" => {
buf.push('\n');
attrs.push((buf.len(), Attribute::Bold));
for c in n.children() {
render(c, buf, attrs);
}
attrs.push((buf.len(), Attribute::NoBold));
buf.push('\n');
}
"em" => {
attrs.push((buf.len(), Attribute::Italic));
for c in n.children() {
render(c, buf, attrs);
}
attrs.push((buf.len(), Attribute::NoItalic));
}
"strong" => {
attrs.push((buf.len(), Attribute::Bold));
for c in n.children() {
render(c, buf, attrs);
}
attrs.push((buf.len(), Attribute::NoBold));
}
"blockquote" | "p" | "tr" => {
buf.push('\n');
for c in n.children() {
render(c, buf, attrs);
}
buf.push('\n');
}
"li" => {
buf.push_str("\n- ");
for c in n.children() {
render(c, buf, attrs);
}
buf.push('\n');
}
"br" => buf.push('\n'),
"hr" => buf.push_str("\n* * *\n"),
_ => {
for c in n.children() {
render(c, buf, attrs);
}
}
}
}
fn epub2(doc: Document, nav: &mut HashMap<String, String>) {
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);
});
}
fn epub3(doc: Document, nav: &mut HashMap<String, String>) {
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);
});
}
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