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//! Types for HTML attributes.
use std::collections::{btree_map, BTreeMap};
use std::iter::FromIterator;
use std::ops::{Index, Range};
use crate::offset::Offset;
/// A map of HTML attributes.
///
/// Does not preserve the order of attributes.
/// Iterating always yields attributes in order by name.
///
/// # Example
///
/// ```
/// # use html5tokenizer::attr::AttributeMap;
/// let attrs: AttributeMap<()> = vec![("href".into(), "http://example.com".into())]
/// .into_iter()
/// .collect();
/// assert_eq!(&attrs["href"], "http://example.com");
/// ```
#[derive(Debug, Default, PartialEq, Eq)]
pub struct AttributeMap<O> {
pub(crate) inner: BTreeMap<String, AttrInternal<O>>,
}
/// The value type internally used by the [`AttributeMap`].
/// Not part of the public API.
#[derive(Debug, Eq, PartialEq)]
pub(crate) struct AttrInternal<O> {
pub value: String,
/// The start offset of the attribute name.
pub name_offset: O,
/// The start offset of the attribute value.
/// For the empty attribute syntax this is just `S::Offset::default()`.
/// We intentionally don't use `Option<S::Offset>` here to spare us a byte per attribute.
pub value_offset: O,
pub value_syntax: Option<AttrValueSyntax>,
}
/// The syntax of the attribute value.
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub enum AttrValueSyntax {
/// An unquoted attribute value, e.g. `id=foo`.
Unquoted,
/// A single-quoted attribute value, e.g. `id='foo'`.
SingleQuoted,
/// A double-quoted attribute value, e.g. `id="foo"`.
DoubleQuoted,
}
/// An HTML attribute borrowed from an [`AttributeMap`].
#[derive(Debug, Eq, PartialEq)]
pub struct Attribute<'a, O> {
name: &'a str,
map_val: &'a AttrInternal<O>,
}
/// An owned HTML attribute.
#[derive(Debug, PartialEq, Eq)]
pub struct AttributeOwned<O> {
/// The attribute name.
pub name: String,
/// The attribute value.
pub value: String,
/// The start offset of the attribute name.
pub name_offset: O,
/// The start offset of the attribute value.
/// `None` in case of the empty attribute syntax (e.g. `disabled` in `<input disabled>`).
pub value_offset: Option<O>,
/// The syntax of the attribute value.
/// `None` indicates the empty attribute syntax (e.g. `disabled` in `<input disabled>`).
pub value_syntax: Option<AttrValueSyntax>,
}
impl<O> AttributeMap<O> {
/// Returns the attribute with the given name.
pub fn get(&self, name: &str) -> Option<Attribute<O>> {
self.inner
.get_key_value(name)
.map(|(name, map_val)| Attribute { name, map_val })
}
}
impl<'a, O: Offset> Attribute<'a, O> {
/// Returns the attribute name.
pub fn name(&self) -> &'a str {
self.name
}
/// Returns the attribute value.
pub fn value(&self) -> &'a str {
&self.map_val.value
}
/// Calculates the span of the attribute name and returns it.
pub fn name_span(&self) -> Range<O> {
self.map_val.name_offset..self.map_val.name_offset + self.name.len()
}
/// For explicitly defined values calculates the span of the attribute value and returns it.
///
/// Returns `None` for attributes using the empty attribute syntax (e.g. `disabled` in `<input disabled>`).
pub fn value_span(&self) -> Option<Range<O>> {
if self.map_val.value_syntax.is_none() {
return None;
}
Some(self.map_val.value_offset..self.map_val.value_offset + self.map_val.value.len())
}
/// Returns the attribute value syntax in case the value is explicitly defined.
///
/// Returns `None` for attributes using the empty attribute syntax (e.g. `disabled` in `<input disabled>`).
pub fn value_syntax(&self) -> Option<AttrValueSyntax> {
self.map_val.value_syntax
}
}
// We cannot impl Index<Output=Attribute> because Index::index returns a reference of
// the Output type (and you cannot return a value referencing a temporary value).
impl<O> Index<&str> for AttributeMap<O> {
type Output = str;
fn index(&self, name: &str) -> &Self::Output {
&self.inner[name].value
}
}
impl<O> IntoIterator for AttributeMap<O> {
type Item = AttributeOwned<O>;
type IntoIter = AttrIntoIter<O>;
fn into_iter(self) -> Self::IntoIter {
AttrIntoIter(self.inner.into_iter())
}
}
/// A consuming iterator over the attributes of an [`AttributeMap`].
pub struct AttrIntoIter<O>(btree_map::IntoIter<String, AttrInternal<O>>);
impl<O> Iterator for AttrIntoIter<O> {
type Item = AttributeOwned<O>;
fn next(&mut self) -> Option<Self::Item> {
let (name, map_val) = self.0.next()?;
Some(AttributeOwned {
name,
value: map_val.value,
name_offset: map_val.name_offset,
value_offset: map_val
.value_syntax
.is_some()
.then_some(map_val.value_offset),
value_syntax: map_val.value_syntax,
})
}
}
impl<'a, O> IntoIterator for &'a AttributeMap<O> {
type Item = Attribute<'a, O>;
type IntoIter = AttrIter<'a, O>;
fn into_iter(self) -> Self::IntoIter {
AttrIter(self.inner.iter())
}
}
/// A borrowed iterator over the attributes of an [`AttributeMap`].
pub struct AttrIter<'a, S>(btree_map::Iter<'a, String, AttrInternal<S>>);
impl<'a, S> Iterator for AttrIter<'a, S> {
type Item = Attribute<'a, S>;
fn next(&mut self) -> Option<Self::Item> {
let (name, map_val) = self.0.next()?;
Some(Attribute { name, map_val })
}
}
impl<O: Default> FromIterator<(String, String)> for AttributeMap<O> {
fn from_iter<T: IntoIterator<Item = (String, String)>>(iter: T) -> Self {
Self {
inner: iter
.into_iter()
.map(|(name, value)| {
(
name,
AttrInternal {
value,
name_offset: O::default(),
value_offset: O::default(),
value_syntax: Some(AttrValueSyntax::DoubleQuoted),
},
)
})
.collect(),
}
}
}
impl<O: Offset> AttrInternal<O> {
pub(crate) fn name_span(&self, name_len: usize) -> Range<O> {
self.name_offset..self.name_offset + name_len
}
}
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