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-rw-r--r--src/epub.rs195
1 files changed, 195 insertions, 0 deletions
diff --git a/src/epub.rs b/src/epub.rs
new file mode 100644
index 0000000..508e6b1
--- /dev/null
+++ b/src/epub.rs
@@ -0,0 +1,195 @@
+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();
+ }
+}