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//! Convert HTML to a [`Node`].
//!
//! Values returned from braced blocks (`{ ... }`) are expected to return
//! something that implements [`Into<Node>`]. This is already implemented for
//! anything that implements [`IntoIterator<Item = Node>`](IntoIterator), so you
//! can return something like a [`Vec<Node>`] or an
//! [`Iterator<Item = Node>`](Iterator) directly.
//!
//! Due to Rust's trait implementation rules, you cannot directly return
//! [`String`]s. Instead, you can use the [`text!`] macro to convert the
//! [`String`] to a [`Node::Text`].
//!
//! [`Node`] implements [`Display`] (and by extension [`ToString`]), so you can
//! turn it into a string representation easily using
//! [`Node::to_string()`][ToString::to_string].
//!
//! See [the rstml docs](https://docs.rs/rstml/) for supported tags and syntax.
//!
//! # Example
//!
//! ```rust
//! use html_node::{html, text};
//!
//! # fn main () {
//! let grocery_list = vec!["milk", "eggs", "bread"];
//!
//! let html = html! {
//! <div>
//! <h1>Shopping List</h1>
//! <ul>
//! { grocery_list.into_iter().zip(1..).map(|(item, i)| html! {
//! <li class="item">
//! <input type="checkbox" id={format!("item-{i}")}>
//! <label for={format!("item-{i}")}>{text!("{item}")}</label>
//! </li>
//! }) }
//! </ul>
//! </div>
//! };
//!
//! let expected = "\
//! <div>\
//! <h1>Shopping List</h1>\
//! <ul>\
//! <li class=\"item\">\
//! <input type=\"checkbox\" id=\"item-1\">\
//! <label for=\"item-1\">milk</label>\
//! </li>\
//! <li class=\"item\">\
//! <input type=\"checkbox\" id=\"item-2\">\
//! <label for=\"item-2\">eggs</label>\
//! </li>\
//! <li class=\"item\">\
//! <input type=\"checkbox\" id=\"item-3\">\
//! <label for=\"item-3\">bread</label>\
//! </li>\
//! </ul>\
//! </div>\
//! ";
//!
//! assert_eq!(html.to_string(), expected);
//! # }
//! ```
#![warn(clippy::cargo)]
#![warn(clippy::nursery)]
#![warn(clippy::pedantic)]
#![warn(missing_copy_implementations)]
#![warn(missing_debug_implementations)]
#![warn(missing_docs)]
#![allow(clippy::missing_errors_doc)]
#![allow(clippy::module_name_repetitions)]
mod macros;
use std::fmt::{self, Display, Formatter};
/// The [`html!`] macro.
///
/// This returns a [`Node`].
///
/// Refer to the [crate-level documentation](crate) for more information.
pub use html_node_macro::html;
/// An HTML node.
#[derive(Clone, Debug)]
pub enum Node {
/// A comment.
///
/// ```html
/// <!-- I'm a comment! -->
/// ```
Comment(Comment),
/// A doctype.
///
/// ```html
/// <!DOCTYPE html>
/// ```
Doctype(Doctype),
/// A fragment.
///
/// ```html
/// <>
/// I'm in a fragment!
/// </>
/// ```
Fragment(Fragment),
/// An element.
///
/// ```html
/// <div class="container">
/// I'm in an element!
/// </div>
/// ```
Element(Element),
/// A text node.
///
/// This can be created using [`text!`].
///
/// ```html
/// <div>
/// I'm a text node!
/// </div>
/// ```
Text(Text),
/// An unsafe text node.
///
/// This can be created using [`unsafe_text!`].
///
/// # Warning
///
/// [`Node::UnsafeText`] is not escaped when rendered, and as such, can
/// allow for XSS attacks. Use with caution!
UnsafeText(UnsafeText),
}
impl<I> From<I> for Node
where
I: IntoIterator<Item = Self>,
{
fn from(iter: I) -> Self {
Self::Fragment(Fragment {
children: iter.into_iter().collect(),
})
}
}
impl Display for Node {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match &self {
Self::Comment(comment) => write!(f, "{comment}"),
Self::Doctype(doctype) => write!(f, "{doctype}"),
Self::Fragment(fragment) => write!(f, "{fragment}"),
Self::Element(element) => write!(f, "{element}"),
Self::Text(text) => write!(f, "{text}"),
Self::UnsafeText(text) => write!(f, "{text}"),
}
}
}
/// A comment.
///
/// ```html
/// <!-- I'm a comment! -->
/// ```
#[derive(Clone, Debug)]
pub struct Comment {
/// The text of the comment.
///
/// ```html
/// <!-- comment -->
/// ```
pub comment: String,
}
impl Display for Comment {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "<!-- {} -->", self.comment)
}
}
/// A doctype.
///
/// ```html
/// <!DOCTYPE html>
/// ```
#[derive(Clone, Debug)]
pub struct Doctype {
/// The value of the doctype.
///
/// ```html
/// <!DOCTYPE synax>
/// ```
pub syntax: String,
}
impl Display for Doctype {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "<!DOCTYPE {}>", self.syntax)
}
}
/// A fragment.
///
/// ```html
/// <>
/// I'm in a fragment!
/// </>
/// ```
#[derive(Clone, Debug)]
pub struct Fragment {
/// The children of the fragment.
///
/// ```html
/// <>
/// <!-- I'm a child! -->
/// <child>I'm another child!</child>
/// </>
pub children: Vec<Node>,
}
impl Display for Fragment {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
for child in &self.children {
write!(f, "{child}")?;
}
Ok(())
}
}
/// An element.
///
/// ```html
/// <div class="container">
/// I'm in an element!
/// </div>
/// ```
#[derive(Clone, Debug)]
pub struct Element {
/// The name of the element.
///
/// ```html
/// <name>
/// ```
pub name: String,
/// The attributes of the element.
///
/// ```html
/// <div attribute="value">
/// ```
pub attributes: Vec<(String, Option<String>)>,
/// The children of the element.
///
/// ```html
/// <div>
/// <!-- I'm a child! -->
/// <child>I'm another child!</child>
/// </div>
/// ```
pub children: Option<Vec<Node>>,
}
impl Display for Element {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "<{}", self.name)?;
for (key, value) in &self.attributes {
write!(f, " {key}")?;
if let Some(value) = value {
let encoded_value = html_escape::encode_double_quoted_attribute(value);
write!(f, r#"="{encoded_value}""#)?;
}
}
write!(f, ">")?;
if let Some(children) = &self.children {
for child in children {
write!(f, "{child}")?;
}
write!(f, "</{}>", self.name)?;
};
Ok(())
}
}
/// A text node.
///
/// This can be created using [`text!`].
///
/// ```html
/// <div>
/// I'm a text node!
/// </div>
#[derive(Clone, Debug)]
pub struct Text {
/// The text of the node.
///
/// ```html
/// <div>
/// text
/// </div>
pub text: String,
}
impl Display for Text {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
let encoded_value = html_escape::encode_text_minimal(&self.text);
write!(f, "{encoded_value}")
}
}
/// An unsafe text node.
///
/// This can be created using [`unsafe_text!`].
///
/// # Warning
///
/// [`Node::UnsafeText`] is not escaped when rendered, and as such, can allow
/// for XSS attacks. Use with caution!
#[derive(Clone, Debug)]
pub struct UnsafeText {
/// The text of the node.
pub text: String,
}
impl Display for UnsafeText {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.text)
}
}