Define core data models for book and theme

src/book.rs

@@ -0,0 +1,90 @@
+pub fn strip_html(input: &str) -> String {
+    let mut result = String::with_capacity(input.len());
+    let mut in_tag = false;
+    let mut in_entity = false;
+    let mut entity = String::new();
+
+    for c in input.chars() {
+        match c {
+            '<' => in_tag = true,
+            '>' if in_tag => in_tag = false,
+            '&' if !in_tag => {
+                in_entity = true;
+                entity.clear();
+            }
+            ';' if in_entity => {
+                in_entity = false;
+                let decoded = match entity.as_str() {
+                    "amp" => "&",
+                    "lt" => "<",
+                    "gt" => ">",
+                    "quot" => "\"",
+                    "nbsp" => " ",
+                    _ => "",
+                };
+                result.push_str(decoded);
+            }
+            c if !in_tag && !in_entity => result.push(c),
+            c if in_entity => entity.push(c),
+            _ => {}
+        }
+    }
+    result
+}
+
+#[derive(Debug, Clone)]
+pub struct TocEntry {
+    pub label: String,
+    pub section: usize,
+    pub children: Vec<TocEntry>,
+}
+
+#[derive(Debug, Clone)]
+pub struct Section {
+    pub title: String,
+    pub content: String,
+    pub pages: Vec<usize>,
+}
+
+#[derive(Debug, Clone)]
+pub struct Book {
+    pub title: String,
+    pub author: String,
+    pub cover: Option<Vec<u8>>,
+    pub sections: Vec<Section>,
+    pub toc: Vec<TocEntry>,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_strip_html_plain_text() {
+        assert_eq!(strip_html("Hello World"), "Hello World");
+    }
+
+    #[test]
+    fn test_strip_html_simple_tags() {
+        assert_eq!(strip_html("<p>Hello</p>"), "Hello");
+    }
+
+    #[test]
+    fn test_strip_html_nested_tags() {
+        assert_eq!(
+            strip_html("<div><p>Hello <b>World</b></p></div>"),
+            "Hello World"
+        );
+    }
+
+    #[test]
+    fn test_strip_html_html_entities() {
+        assert_eq!(strip_html("Hello &amp; World"), "Hello & World");
+        assert_eq!(strip_html("Hello&nbsp;World"), "Hello World");
+    }
+
+    #[test]
+    fn test_strip_html_empty() {
+        assert_eq!(strip_html(""), "");
+    }
+}