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extern crate kuchiki; extern crate regex; use kuchiki::{NodeData, NodeRef}; use regex::Regex; lazy_static! { static ref RE_NEW_LINE: Regex = Regex::new("\n[\n\t ]*").unwrap(); } #[derive(Debug, Clone)] pub enum Heading { Header { level: u8, text: String, }, Group(Vec<Heading>), } impl Heading { #[inline] pub fn get_end_level(&self) -> u8 { match self { Heading::Header { level, .. } => *level, Heading::Group(headings) => headings[headings.len() - 1].get_end_level(), } } #[inline] pub fn get_start_level(&self) -> u8 { match self { Heading::Header { level, .. } => *level, Heading::Group(headings) => headings[0].get_end_level(), } } } pub(crate) fn create_heading(node: NodeRef, depth: usize, max_depth: usize) -> Option<Heading> { if depth > max_depth { return None; } let mut heading = if let NodeData::Element(element_data) = node.data() { let local_name: &str = &element_data.name.local; let local_name_length = local_name.len(); match local_name_length { 2 => { if local_name.starts_with('h') { match local_name[1..].parse::<u8>() { Ok(level) if level >= 1 && level <= 6 => { Heading::Header { level, text: String::new(), } } _ => return None, } } else { return None; } } 6 => { if local_name.eq("hgroup") { Heading::Group(Vec::with_capacity(2)) } else { return None; } } _ => return None, } } else { return None; }; match &mut heading { Heading::Header { text, .. } => { for child in node.children() { create_text(text, child, depth + 1, max_depth); } } Heading::Group(headings) => { for child in node.children() { if let Some(heading) = create_heading(child, depth + 1, max_depth) { headings.push(heading); } } if headings.is_empty() { return None; } } } Some(heading) } impl Into<String> for Heading { #[inline] fn into(self) -> String { match self { Heading::Header { text, .. } => text, Heading::Group(headings) => { let mut iter = headings.into_iter(); let mut text: String = iter.next().unwrap().into(); for heading in iter { text.push_str(" — "); let t: String = heading.into(); text.push_str(&t); } text } } } } #[inline] pub(crate) fn create_text(text: &mut String, node: NodeRef, depth: usize, max_depth: usize) { if depth > max_depth { return; } if let NodeData::Text(t) = node.data() { let t = t.borrow(); text.push_str(RE_NEW_LINE.replace(t.as_str(), " ").trim()); } else { for child in node.children() { create_text(text, child, depth + 1, max_depth); } } }