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use crate::{
inline::{hashmap::InlineHashMap, vec::InlineVec},
queryselector::{self, QuerySelectorIterator},
Bytes, InnerNodeHandle,
};
use std::{borrow::Cow, mem};
use super::{handle::NodeHandle, Parser};
const INLINED_ATTRIBUTES: usize = 2;
const INLINED_SUBNODES: usize = 2;
const HTML_VOID_ELEMENTS: [&str; 16] = [
"area", "base", "br", "col", "command", "embed", "hr", "img", "input", "keygen", "link",
"meta", "param", "source", "track", "wbr",
];
/// The type of map for "raw" attributes
pub type RawAttributesMap<'a> = InlineHashMap<Bytes<'a>, Option<Bytes<'a>>, INLINED_ATTRIBUTES>;
/// The type of vector for children of an HTML tag
pub type RawChildren = InlineVec<NodeHandle, INLINED_SUBNODES>;
/// Stores all attributes of an HTML tag, as well as additional metadata such as `id` and `class`
#[derive(Debug, Clone)]
pub struct Attributes<'a> {
/// Raw attributes (maps attribute key to attribute value)
pub(crate) raw: RawAttributesMap<'a>,
/// The ID of this HTML element, if present
pub(crate) id: Option<Bytes<'a>>,
/// A list of class names of this HTML element, if present
pub(crate) class: Option<Bytes<'a>>,
}
impl<'a> Attributes<'a> {
/// Creates a new `Attributes
pub(crate) fn new() -> Self {
Self {
raw: InlineHashMap::new(),
id: None,
class: None,
}
}
/// Counts the number of attributes
pub fn len(&self) -> usize {
let mut raw = self.raw.len();
if self.id.is_some() {
raw += 1;
}
if self.class.is_some() {
raw += 1;
}
raw
}
/// Checks whether this collection of attributes is empty
pub fn is_empty(&self) -> bool {
self.len() == 0
}
/// Checks whether a given string is in the class names list
pub fn is_class_member<B: AsRef<[u8]>>(&self, member: B) -> bool {
self.class_iter()
.map_or(false, |mut i| i.any(|s| s.as_bytes() == member.as_ref()))
}
/// Checks whether this attributes collection contains a given key and returns its value
///
/// Attributes that exist in this tag but have no value set will have their inner Option set to None
pub fn get<B>(&self, key: B) -> Option<Option<&Bytes<'a>>>
where
B: Into<Bytes<'a>>,
{
let key: Bytes = key.into();
match key.as_bytes() {
b"id" => self.id.as_ref().map(Some),
b"class" => self.class.as_ref().map(Some),
_ => self.raw.get(&key).map(|x| x.as_ref()),
}
}
/// Checks whether this attributes collection contains a given key
pub fn contains<B>(&self, key: B) -> bool
where
B: Into<Bytes<'a>>,
{
self.get(key).is_some()
}
/// Removes an attribute from this collection and returns it.
///
/// As with [`Attributes::get()`], the outer Option is set to None if the attribute does not exist.
/// The inner option is set to None if the attribute exists but has no value.
///
/// # Example
/// ```
/// let mut dom = tl::parse("<span contenteditable=\"true\"></span>", Default::default()).unwrap();
/// let element = dom.nodes_mut()[0].as_tag_mut().unwrap();
/// let attributes = element.attributes_mut();
///
/// assert_eq!(attributes.remove("contenteditable"), Some(Some("true".into())));
/// assert_eq!(attributes.len(), 0);
/// ```
pub fn remove<B>(&mut self, key: B) -> Option<Option<Bytes<'a>>>
where
B: Into<Bytes<'a>>,
{
let key: Bytes = key.into();
match key.as_bytes() {
b"id" => self.id.take().map(Some),
b"class" => self.class.take().map(Some),
_ => self.raw.remove(&key),
}
}
/// Removes the value of an attribute in this collection and returns it.
///
/// # Example
/// ```
/// let mut dom = tl::parse("<span contenteditable=\"true\"></span>", Default::default()).unwrap();
/// let element = dom.nodes_mut()[0].as_tag_mut().unwrap();
/// let attributes = element.attributes_mut();
///
/// assert_eq!(attributes.remove_value("contenteditable"), Some("true".into()));
/// assert_eq!(attributes.get("contenteditable"), Some(None));
/// ```
pub fn remove_value<B>(&mut self, key: B) -> Option<Bytes<'a>>
where
B: Into<Bytes<'a>>,
{
let key: Bytes = key.into();
match key.as_bytes() {
b"id" => self.id.take(),
b"class" => self.class.take(),
_ => self.raw.get_mut(&key).and_then(mem::take),
}
}
/// Checks whether this attributes collection contains a given key and returns its value
pub fn get_mut<B>(&mut self, key: B) -> Option<Option<&mut Bytes<'a>>>
where
B: Into<Bytes<'a>>,
{
let key: Bytes = key.into();
match key.as_bytes() {
b"id" => self.id.as_mut().map(Some),
b"class" => self.class.as_mut().map(Some),
_ => self.raw.get_mut(&key).map(Option::as_mut),
}
}
/// Inserts a new attribute into this attributes collection
pub fn insert<K, V>(&mut self, key: K, value: Option<V>)
where
K: Into<Bytes<'a>>,
V: Into<Bytes<'a>>,
{
let key: Bytes = key.into();
let value = value.map(Into::into);
match key.as_bytes() {
b"id" => self.id = value,
b"class" => self.class = value,
_ => self.raw.insert(key, value),
};
}
/// Returns an iterator `(attribute_key, attribute_value)` over the attributes of this `HTMLTag`
pub fn iter(&self) -> impl Iterator<Item = (Cow<str>, Option<Cow<str>>)> + '_ {
self.raw
.iter()
.map(|(k, v)| {
let k = k.as_utf8_str();
let v = v.as_ref().map(|x| x.as_utf8_str());
(Some(k), v)
})
.chain([
(
self.id.is_some().then(|| Cow::Borrowed("id")),
self.id.as_ref().map(|x| x.as_utf8_str()),
),
(
self.class.is_some().then(|| Cow::Borrowed("class")),
self.class.as_ref().map(|x| x.as_utf8_str()),
),
])
.flat_map(|(k, v)| k.map(|k| (k, v)))
}
/// Returns the `id` attribute of this HTML tag, if present
pub fn id(&self) -> Option<&Bytes<'a>> {
self.id.as_ref()
}
/// Returns the `class` attribute of this HTML tag, if present
pub fn class(&self) -> Option<&Bytes<'a>> {
self.class.as_ref()
}
/// Returns an iterator over all of the class members
pub fn class_iter(&self) -> Option<impl Iterator<Item = &'_ str> + '_> {
self.class
.as_ref()
.and_then(Bytes::try_as_utf8_str)
.map(str::split_ascii_whitespace)
}
/// Returns the underlying raw map for attributes
///
/// ## A note on stability
/// It is not guaranteed for the returned map to include all attributes.
/// Some attributes may be stored in `Attributes` itself and not in the raw map.
/// For that reason you should prefer to call methods on `Attributes` directly,
/// i.e. `Attributes::get()` to lookup an attribute by its key.
pub fn unstable_raw(&self) -> &RawAttributesMap<'a> {
&self.raw
}
}
/// Represents a single HTML element
#[derive(Debug, Clone)]
pub struct HTMLTag<'a> {
pub(crate) _name: Bytes<'a>,
pub(crate) _attributes: Attributes<'a>,
pub(crate) _children: RawChildren,
pub(crate) _raw: Bytes<'a>,
}
impl<'a> HTMLTag<'a> {
/// Creates a new HTMLTag
#[inline(always)]
pub(crate) fn new(
name: Bytes<'a>,
attr: Attributes<'a>,
children: InlineVec<NodeHandle, INLINED_SUBNODES>,
raw: Bytes<'a>,
) -> Self {
Self {
_name: name,
_attributes: attr,
_children: children,
_raw: raw,
}
}
/// Returns a wrapper around the children of this HTML tag
#[inline]
pub fn children(&self) -> Children<'a, '_> {
Children(self)
}
/// Returns a mutable wrapper around the children of this HTML tag.
pub fn children_mut(&mut self) -> ChildrenMut<'a, '_> {
ChildrenMut(self)
}
/// Returns the name of this HTML tag
#[inline]
pub fn name(&self) -> &Bytes<'a> {
&self._name
}
/// Returns a mutable reference to the name of this HTML tag
#[inline]
pub fn name_mut(&mut self) -> &mut Bytes<'a> {
&mut self._name
}
/// Returns attributes of this HTML tag
#[inline]
pub fn attributes(&self) -> &Attributes<'a> {
&self._attributes
}
/// Returns a mutable reference to the attributes of this HTML tag
#[inline]
pub fn attributes_mut(&mut self) -> &mut Attributes<'a> {
&mut self._attributes
}
/// Returns the contained markup
///
/// ## Limitations
/// - The order of tag attributes is not guaranteed
/// - Spaces within the tag are not preserved (i.e. `<img src="">` may become `<img src="">`)
///
/// Equivalent to [Element#outerHTML](https://developer.mozilla.org/en-US/docs/Web/API/Element/outerHTML) in browsers.
pub fn outer_html<'p>(&'p self, parser: &'p Parser<'a>) -> String {
let tag_name = self._name.as_utf8_str();
let is_void_element = HTML_VOID_ELEMENTS.contains(&tag_name.as_ref());
let mut outer_html = format!("<{}", &tag_name);
#[inline]
fn write_attribute(dest: &mut String, k: Cow<str>, v: Option<Cow<str>>) {
dest.push(' ');
dest.push_str(&k);
if let Some(value) = v {
dest.push_str("=\"");
dest.push_str(&value);
dest.push('"');
}
}
let attr = self.attributes();
for (k, v) in attr.iter() {
write_attribute(&mut outer_html, k, v);
}
outer_html.push('>');
// void elements have neither content nor a closing tag.
if is_void_element {
return outer_html;
}
// TODO(y21): More of an idea than a TODO, but a potential perf improvement
// could be having some kind of internal inner_html function that takes a &mut String
// and simply writes to it instead of returning a newly allocated string for every element
// and appending it
outer_html.push_str(&self.inner_html(parser));
outer_html.push_str("</");
outer_html.push_str(&self._name.as_utf8_str());
outer_html.push('>');
outer_html
}
/// Returns the contained markup
///
/// ## Limitations
/// - The order of tag attributes is not guaranteed
/// - Spaces within the tag are not preserved (i.e. `<img src="">` may become `<img src="">`)
///
/// Equivalent to [Element#innerHTML](https://developer.mozilla.org/en-US/docs/Web/API/Element/innerHTML) in browsers.
pub fn inner_html<'p>(&'p self, parser: &'p Parser<'a>) -> String {
self.children()
.top()
.iter()
.map(|handle| handle.get(parser).unwrap())
.map(|node| node.outer_html(parser))
.collect::<String>()
}
/// Returns the raw HTML of this tag.
/// This is a cheaper version of `HTMLTag::inner_html` if you never mutate any nodes.
///
/// **Note:** Mutating this tag does *not* re-compute the HTML representation of this tag.
/// This simply returns a reference to the substring.
pub fn raw(&self) -> &Bytes<'a> {
&self._raw
}
/// Returns the boundaries/position `(start, end)` of this HTML tag in the source string.
///
/// # Example
/// ```
/// let source = "<p><span>hello</span></p>";
/// let dom = tl::parse(source, Default::default()).unwrap();
/// let parser = dom.parser();
/// let span = dom.nodes().iter().filter_map(|n| n.as_tag()).find(|n| n.name() == "span").unwrap();
/// let (start, end) = span.boundaries(parser);
/// assert_eq!((start, end), (3, 20));
/// assert_eq!(&source[start..=end], "<span>hello</span>");
/// ```
pub fn boundaries(&self, parser: &Parser<'a>) -> (usize, usize) {
let raw = self._raw.as_bytes();
let input = parser.stream.data().as_ptr();
let start = raw.as_ptr();
let offset = start as usize - input as usize;
let end = offset + raw.len() - 1;
(offset, end)
}
/// Returns the contained text of this element, excluding any markup.
/// Equivalent to [Element#innerText](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/innerText) in browsers.
/// This function may not allocate memory for a new string as it can just return the part of the tag that doesn't have markup.
/// For tags that *do* have more than one subnode, this will allocate memory
pub fn inner_text<'p>(&self, parser: &'p Parser<'a>) -> Cow<'p, str> {
let len = self._children.len();
if len == 0 {
// If there are no subnodes, we can just return a static, empty, string slice
return Cow::Borrowed("");
}
let first = self._children[0].get(parser).unwrap();
if len == 1 {
match &first {
Node::Tag(t) => return t.inner_text(parser),
Node::Raw(e) => return e.as_utf8_str(),
Node::Comment(_) => return Cow::Borrowed(""),
}
}
// If there are >1 nodes, we need to allocate a new string and push each inner_text in it
// TODO: check if String::with_capacity() is worth it
let mut s = String::from(first.inner_text(parser));
for &id in self._children.iter().skip(1) {
let node = id.get(parser).unwrap();
match &node {
Node::Tag(t) => s.push_str(&t.inner_text(parser)),
Node::Raw(e) => s.push_str(&e.as_utf8_str()),
Node::Comment(_) => { /* no op */ }
}
}
Cow::Owned(s)
}
/// Tries to parse the query selector and returns an iterator over elements that match the given query selector.
///
/// # Example
/// ```
/// let dom = tl::parse(r#"
/// <div class="x">
/// <div class="y">
/// <div class="z">MATCH</div>
/// <div class="z">MATCH</div>
/// <div class="z">MATCH</div>
/// </div>
/// </div>
/// <div class="z">NO MATCH</div>
/// <div class="z">NO MATCH</div>
/// <div class="z">NO MATCH</div>
/// "#, Default::default()).unwrap();
/// let parser = dom.parser();
///
/// let outer = dom
/// .get_elements_by_class_name("y")
/// .next()
/// .unwrap()
/// .get(parser)
/// .unwrap()
/// .as_tag()
/// .unwrap();
///
/// let inner_z = outer.query_selector(parser, ".z").unwrap();
///
/// assert_eq!(inner_z.clone().count(), 3);
///
/// for handle in inner_z {
/// let node = handle.get(parser).unwrap().as_tag().unwrap();
/// assert_eq!(node.inner_text(parser), "MATCH");
/// }
///
/// ```
pub fn query_selector<'b>(
&'b self,
parser: &'b Parser<'a>,
selector: &'b str,
) -> Option<QuerySelectorIterator<'a, 'b, Self>> {
let selector = crate::parse_query_selector(selector)?;
let iter = queryselector::QuerySelectorIterator::new(selector, parser, self);
Some(iter)
}
/// Calls the given closure with each tag as parameter
///
/// The closure must return a boolean, indicating whether it should stop iterating
/// Returning `true` will break the loop
pub fn find_node<F>(&self, parser: &Parser<'a>, f: &mut F) -> Option<NodeHandle>
where
F: FnMut(&Node<'a>) -> bool,
{
for &id in self._children.iter() {
let node = id.get(parser).unwrap();
if f(node) {
return Some(id);
}
}
None
}
}
/// A thin wrapper around the children of [`HTMLTag`]
#[derive(Debug, Clone)]
pub struct Children<'a, 'b>(&'b HTMLTag<'a>);
impl<'a, 'b> Children<'a, 'b> {
/// Returns the topmost, direct children of this tag.
///
/// # Example
/// ```
/// let dom = tl::parse(r#"
/// <div id="a">
/// <div id="b">
/// <span>Hello</span>
/// <span>World</span>
/// <span>.</span>
/// </div>
/// </div>
/// "#, Default::default()).unwrap();
///
/// let a = dom.get_element_by_id("a")
/// .unwrap()
/// .get(dom.parser())
/// .unwrap()
/// .as_tag()
/// .unwrap();
///
/// // Calling this function on the first div tag (#a) will return a slice containing 3 elements:
/// // - whitespaces around (before and after) div#b
/// // - div#b itself
/// // It does **not** contain the inner span tags
/// assert_eq!(a.children().top().len(), 3);
/// ```
#[inline]
pub fn top(&self) -> &RawChildren {
&self.0._children
}
/// Returns the starting boundary of the children of this tag.
#[inline]
pub fn start(&self) -> Option<InnerNodeHandle> {
self.0._children.get(0).map(NodeHandle::get_inner)
}
/// Returns the ending boundary of the children of this tag.
pub fn end(&self, parser: &Parser<'a>) -> Option<InnerNodeHandle> {
find_last_node_handle(self.0, parser).map(|h| h.get_inner())
}
/// Returns the (start, end) boundaries of the children of this tag.
#[inline]
pub fn boundaries(&self, parser: &Parser<'a>) -> Option<(InnerNodeHandle, InnerNodeHandle)> {
self.start().zip(self.end(parser))
}
/// Returns a slice containing all of the children of this [`HTMLTag`],
/// including all subnodes of the children.
///
/// The difference between `top()` and `all()` is the same as `VDom::children()` and `VDom::nodes()`
///
/// # Example
/// ```
/// let dom = tl::parse(r#"
/// <div id="a"><div id="b"><span>Hello</span><span>World</span><span>!</span></div></div>
/// "#, Default::default()).unwrap();
///
/// let a = dom.get_element_by_id("a")
/// .unwrap()
/// .get(dom.parser())
/// .unwrap()
/// .as_tag()
/// .unwrap();
///
/// // Calling this function on the first div tag (#a) will return a slice containing all of the subnodes:
/// // - div#b
/// // - span
/// // - Hello
/// // - span
/// // - World
/// // - span
/// // - !
/// assert_eq!(a.children().all(dom.parser()).len(), 7);
/// ```
pub fn all(&self, parser: &'b Parser<'a>) -> &'b [Node<'a>] {
self.boundaries(parser)
.map(|(start, end)| &parser.tags[start as usize..=end as usize])
.unwrap_or(&[])
}
}
/// A thin mutable wrapper around the children of [`HTMLTag`]
#[derive(Debug)]
pub struct ChildrenMut<'a, 'b>(&'b mut HTMLTag<'a>);
impl<'a, 'b> ChildrenMut<'a, 'b> {
/// Returns the topmost, direct children of this tag as a mutable slice.
///
/// See [`Children::top`] for more details and examples.
#[inline]
pub fn top_mut(&mut self) -> &mut RawChildren {
&mut self.0._children
}
}
/// Attempts to find the very last node handle that is contained in the given tag
fn find_last_node_handle<'a>(tag: &HTMLTag<'a>, parser: &Parser<'a>) -> Option<NodeHandle> {
let last_handle = tag._children.as_slice().last().copied()?;
let child = last_handle
.get(parser)
.expect("Failed to get child node, please open a bug report") // this shouldn't happen
.as_tag();
if let Some(child) = child {
// Recursively call this function to get to the innermost node
find_last_node_handle(child, parser).or(Some(last_handle))
} else {
Some(last_handle)
}
}
/// An HTML Node
#[derive(Debug, Clone)]
pub enum Node<'a> {
/// A regular HTML element/tag
Tag(HTMLTag<'a>),
/// Raw text (no particular HTML element)
Raw(Bytes<'a>),
/// Comment (<!-- -->)
Comment(Bytes<'a>),
}
impl<'a> Node<'a> {
/// Returns the inner text of this node
pub fn inner_text<'s, 'p: 's>(&'s self, parser: &'p Parser<'a>) -> Cow<'s, str> {
match self {
Node::Comment(_) => Cow::Borrowed(""),
Node::Raw(r) => r.as_utf8_str(),
Node::Tag(t) => t.inner_text(parser),
}
}
/// Returns the outer HTML of this node
pub fn outer_html<'s>(&'s self, parser: &Parser<'a>) -> Cow<'s, str> {
match self {
Node::Comment(c) => c.as_utf8_str(),
Node::Raw(r) => r.as_utf8_str(),
Node::Tag(t) => Cow::Owned(t.outer_html(parser)),
}
}
/// Returns the inner HTML of this node
pub fn inner_html<'s>(&'s self, parser: &Parser<'a>) -> Cow<'s, str> {
match self {
Node::Comment(c) => c.as_utf8_str(),
Node::Raw(r) => r.as_utf8_str(),
Node::Tag(t) => Cow::Owned(t.inner_html(parser)),
}
}
/// Returns an iterator over subnodes ("children") of this HTML tag, if this is a tag
pub fn children(&self) -> Option<Children<'a, '_>> {
match self {
Node::Tag(t) => Some(t.children()),
_ => None,
}
}
/// Calls the given closure with each tag as parameter
///
/// The closure must return a boolean, indicating whether it should stop iterating
/// Returning `true` will break the loop and return a handle to the node
pub fn find_node<F>(&self, parser: &Parser<'a>, f: &mut F) -> Option<NodeHandle>
where
F: FnMut(&Node<'a>) -> bool,
{
if let Some(children) = self.children() {
for &id in children.top().iter() {
let node = id.get(parser).unwrap();
if f(node) {
return Some(id);
}
let subnode = node.find_node(parser, f);
if subnode.is_some() {
return subnode;
}
}
}
None
}
/// Tries to coerce this node into a `HTMLTag` variant
pub fn as_tag(&self) -> Option<&HTMLTag<'a>> {
match self {
Self::Tag(tag) => Some(tag),
_ => None,
}
}
/// Tries to coerce this node into a `HTMLTag` variant
pub fn as_tag_mut(&mut self) -> Option<&mut HTMLTag<'a>> {
match self {
Self::Tag(tag) => Some(tag),
_ => None,
}
}
/// Tries to coerce this node into a comment, returning the text
pub fn as_comment(&self) -> Option<&Bytes<'a>> {
match self {
Self::Comment(c) => Some(c),
_ => None,
}
}
/// Tries to coerce this node into a comment, returning the text
pub fn as_comment_mut(&mut self) -> Option<&mut Bytes<'a>> {
match self {
Self::Comment(c) => Some(c),
_ => None,
}
}
/// Tries to coerce this node into a raw text node, returning the text
///
/// "Raw text nodes" are nodes that are not HTML tags, but just text
pub fn as_raw(&self) -> Option<&Bytes<'a>> {
match self {
Self::Raw(r) => Some(r),
_ => None,
}
}
/// Tries to coerce this node into a mutable raw text node, returning the text
///
/// "Raw text nodes" are nodes that are not HTML tags, but just text
pub fn as_raw_mut(&mut self) -> Option<&mut Bytes<'a>> {
match self {
Self::Raw(r) => Some(r),
_ => None,
}
}
}