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use std::borrow::Cow;
use super::Html;
use crate::node::{Comment, Doctype, Element, Node, ProcessingInstruction, Text};
use ego_tree::NodeId;
use html5ever::tendril::StrTendril;
use html5ever::tree_builder::{ElementFlags, NodeOrText, QuirksMode, TreeSink};
use html5ever::Attribute;
use html5ever::{ExpandedName, QualName};
/// Note: does not support the `<template>` element.
impl TreeSink for Html {
type Output = Self;
type Handle = NodeId;
fn finish(self) -> Self {
self
}
// Signal a parse error.
fn parse_error(&mut self, msg: Cow<'static, str>) {
self.errors.push(msg);
}
// Set the document's quirks mode.
fn set_quirks_mode(&mut self, mode: QuirksMode) {
self.quirks_mode = mode;
}
// Get a handle to the Document node.
fn get_document(&mut self) -> Self::Handle {
self.tree.root().id()
}
// Do two handles refer to the same node?
fn same_node(&self, x: &Self::Handle, y: &Self::Handle) -> bool {
x == y
}
// What is the name of this element?
//
// Should never be called on a non-element node; feel free to panic!.
fn elem_name(&self, target: &Self::Handle) -> ExpandedName {
self.tree
.get(*target)
.unwrap()
.value()
.as_element()
.unwrap()
.name
.expanded()
}
// Create an element.
//
// When creating a template element (name.ns.expanded() == expanded_name!(html "template")), an
// associated document fragment called the "template contents" should also be created. Later
// calls to self.get_template_contents() with that given element return it.
fn create_element(
&mut self,
name: QualName,
attrs: Vec<Attribute>,
_flags: ElementFlags,
) -> Self::Handle {
let mut node = self
.tree
.orphan(Node::Element(Element::new(name.clone(), attrs)));
if name.expanded() == expanded_name!(html "template") {
node.append(Node::Fragment);
}
node.id()
}
// Create a comment node.
fn create_comment(&mut self, text: StrTendril) -> Self::Handle {
self.tree
.orphan(Node::Comment(Comment { comment: text }))
.id()
}
// Append a DOCTYPE element to the Document node.
fn append_doctype_to_document(
&mut self,
name: StrTendril,
public_id: StrTendril,
system_id: StrTendril,
) {
let doctype = Doctype {
name,
public_id,
system_id,
};
self.tree.root_mut().append(Node::Doctype(doctype));
}
// Append a node as the last child of the given node. If this would produce adjacent sibling
// text nodes, it should concatenate the text instead.
//
// The child node will not already have a parent.
fn append(&mut self, parent: &Self::Handle, child: NodeOrText<Self::Handle>) {
let mut parent = self.tree.get_mut(*parent).unwrap();
match child {
NodeOrText::AppendNode(id) => {
parent.append_id(id);
}
NodeOrText::AppendText(text) => {
let can_concat = parent
.last_child()
.map_or(false, |mut n| n.value().is_text());
if can_concat {
let mut last_child = parent.last_child().unwrap();
match *last_child.value() {
Node::Text(ref mut t) => t.text.push_tendril(&text),
_ => unreachable!(),
}
} else {
parent.append(Node::Text(Text { text }));
}
}
}
}
// Append a node as the sibling immediately before the given node. If that node has no parent,
// do nothing and return Err(new_node).
//
// The tree builder promises that sibling is not a text node. However its old previous sibling,
// which would become the new node's previous sibling, could be a text node. If the new node is
// also a text node, the two should be merged, as in the behavior of append.
//
// NB: new_node may have an old parent, from which it should be removed.
fn append_before_sibling(
&mut self,
sibling: &Self::Handle,
new_node: NodeOrText<Self::Handle>,
) {
if let NodeOrText::AppendNode(id) = new_node {
self.tree.get_mut(id).unwrap().detach();
}
let mut sibling = self.tree.get_mut(*sibling).unwrap();
if sibling.parent().is_some() {
match new_node {
NodeOrText::AppendNode(id) => {
sibling.insert_id_before(id);
}
NodeOrText::AppendText(text) => {
let can_concat = sibling
.prev_sibling()
.map_or(false, |mut n| n.value().is_text());
if can_concat {
let mut prev_sibling = sibling.prev_sibling().unwrap();
match *prev_sibling.value() {
Node::Text(ref mut t) => t.text.push_tendril(&text),
_ => unreachable!(),
}
} else {
sibling.insert_before(Node::Text(Text { text }));
}
}
}
}
}
// Detach the given node from its parent.
fn remove_from_parent(&mut self, target: &Self::Handle) {
self.tree.get_mut(*target).unwrap().detach();
}
// Remove all the children from node and append them to new_parent.
fn reparent_children(&mut self, node: &Self::Handle, new_parent: &Self::Handle) {
self.tree
.get_mut(*new_parent)
.unwrap()
.reparent_from_id_append(*node);
}
// Add each attribute to the given element, if no attribute with that name already exists. The
// tree builder promises this will never be called with something else than an element.
fn add_attrs_if_missing(&mut self, target: &Self::Handle, attrs: Vec<Attribute>) {
let mut node = self.tree.get_mut(*target).unwrap();
let element = match *node.value() {
Node::Element(ref mut e) => e,
_ => unreachable!(),
};
for attr in attrs {
element.attrs.entry(attr.name).or_insert(attr.value);
}
}
// Get a handle to a template's template contents.
//
// The tree builder promises this will never be called with something else than a template
// element.
fn get_template_contents(&mut self, target: &Self::Handle) -> Self::Handle {
self.tree.get(*target).unwrap().first_child().unwrap().id()
}
// Mark a HTML <script> element as "already started".
fn mark_script_already_started(&mut self, _node: &Self::Handle) {}
// Create Processing Instruction.
fn create_pi(&mut self, target: StrTendril, data: StrTendril) -> Self::Handle {
self.tree
.orphan(Node::ProcessingInstruction(ProcessingInstruction {
target,
data,
}))
.id()
}
fn append_based_on_parent_node(
&mut self,
element: &Self::Handle,
prev_element: &Self::Handle,
child: NodeOrText<Self::Handle>,
) {
if self.tree.get(*element).unwrap().parent().is_some() {
self.append_before_sibling(element, child)
} else {
self.append(prev_element, child)
}
}
}