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extern crate kuchiki; use crate::heading::*; use crate::sectioning_type::SectioningType; use kuchiki::traits::TendrilSink; use kuchiki::{parse_html, NodeData, NodeRef}; const SECTIONING_ROOTS: [&str; 7] = ["blockquote", "body", "details", "dialog", "fieldset", "figure", "td"]; #[derive(Debug, Clone)] pub struct OutlineStructure { pub sectioning_type: SectioningType, pub heading: Option<Heading>, pub sub_outline_structures: Vec<OutlineStructure>, } impl OutlineStructure { #[inline] pub(crate) fn new(sectioning_type: SectioningType) -> OutlineStructure { OutlineStructure { sectioning_type, heading: None, sub_outline_structures: Vec::new(), } } #[inline] pub fn parse_html<S: AsRef<str>>(html: S, max_depth: usize) -> OutlineStructure { let node = parse_html().one(html.as_ref()); if let Some(outline_structure) = create_outline_structure_finding_body(node.clone(), 0, max_depth) { outline_structure } else { create_outline_structure(SectioningType::Root, node, 0, max_depth) .unwrap_or_else(|| OutlineStructure::new(SectioningType::Root)) } } } pub(crate) fn create_outline_structure( sectioning_type: SectioningType, node: NodeRef, depth: usize, max_depth: usize, ) -> Option<OutlineStructure> { if depth > max_depth { return None; } let mut outline_structure = OutlineStructure::new(sectioning_type); let mut find_heading = true; for child in node.children() { if let NodeData::Element(element_data) = child.data() { let local_name: &str = &element_data.name.local; if SECTIONING_ROOTS.binary_search(&local_name).is_ok() { continue; } if let Some(sub_sectioning_type) = SectioningType::from_sectioning_content_tag(local_name) { if let Some(sub_outline_structure) = create_outline_structure(sub_sectioning_type, child, depth + 1, max_depth) { outline_structure.sub_outline_structures.push(sub_outline_structure); } } else if let Some(heading) = create_heading(child.clone(), depth + 1, max_depth) { if find_heading { outline_structure.heading = Some(heading); } else { let mut sub_outline_structure = OutlineStructure::new(SectioningType::Heading); sub_outline_structure.heading = Some(heading); outline_structure.sub_outline_structures.push(sub_outline_structure); } } else { if let Some(sub_outline_structure) = create_outline_structure(SectioningType::Root, child, depth + 1, max_depth) { if let Some(heading) = sub_outline_structure.heading { if find_heading { outline_structure.heading = Some(heading); } else { let mut sub_outline_structure = OutlineStructure::new(SectioningType::Heading); sub_outline_structure.heading = Some(heading); outline_structure.sub_outline_structures.push(sub_outline_structure); } } for os in sub_outline_structure.sub_outline_structures { outline_structure.sub_outline_structures.push(os); } } continue; } find_heading = false; } } Some(outline_structure) } pub(crate) fn create_outline_structure_finding_body( node: NodeRef, depth: usize, max_depth: usize, ) -> Option<OutlineStructure> { if depth > max_depth { return None; } if let NodeData::Element(element_data) = node.data() { let local_name: &str = &element_data.name.local; if local_name == "body" { return Some( create_outline_structure(SectioningType::Body, node.clone(), depth, max_depth) .unwrap_or_else(|| OutlineStructure::new(SectioningType::Root)), ); } } for child in node.children() { if let Some(outline_structure) = create_outline_structure_finding_body(child, depth + 1, max_depth) { return Some(outline_structure); } } None }