File size: 8,643 Bytes
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pub struct Element {
pub name: String,
pub attr: Vec<(String, String)>,
pub children: Vec<Element>,
pub text: Option<String>,
}
impl Element {
pub fn new(name_with_classes: impl ToString) -> Self {
let full_name = name_with_classes.to_string();
let parts: Vec<&str> = full_name.split('.').collect();
let mut element = Element {
name: parts.first().unwrap_or(&"").to_string(),
attr: vec![],
children: vec![],
text: None,
};
// Add classes if there are any
if parts.len() > 1 {
let classes = parts.get(1..).unwrap_or_default().join(" ");
element.attr.push(("class".to_string(), classes));
}
element
}
pub fn span(name: impl ToString) -> Self {
Element::new("span").text(name)
}
pub fn text(mut self, text: impl ToString) -> Self {
self.text = Some(html_escape::encode_text(&text.to_string()).to_string());
self
}
pub fn cdata(mut self, text: impl ToString) -> Self {
self.text = Some(format!("<![CDATA[{}]]>", text.to_string()));
self
}
pub fn attr(mut self, key: impl ToString, value: impl ToString) -> Self {
self.attr.push((key.to_string(), value.to_string()));
self
}
pub fn attr_if_some(mut self, key: impl ToString, value: Option<impl ToString>) -> Self {
if let Some(val) = value {
self.attr.push((key.to_string(), val.to_string()));
}
self
}
pub fn class(mut self, class_name: impl ToString) -> Self {
// Check if class attribute already exists
if let Some(pos) = self.attr.iter().position(|(key, _)| key == "class") {
// Append to existing class
if let Some((_, current_class)) = self.attr.get(pos) {
let new_class = format!("{} {}", current_class, class_name.to_string());
if let Some(entry) = self.attr.get_mut(pos) {
*entry = ("class".to_string(), new_class);
}
}
} else {
// Add new class attribute
self.attr
.push(("class".to_string(), class_name.to_string()));
}
self
}
pub fn append(self, item: impl CanAppend) -> Self {
item.append_to(self)
}
pub fn render(&self) -> String {
let mut result = String::new();
if self.attr.is_empty() {
result.push_str(&format!("<{}>", self.name));
} else {
result.push_str(&format!("<{}", self.name));
for (key, value) in &self.attr {
result.push_str(&format!("\n {key}=\"{value}\""));
}
result.push_str("\n>");
}
if let Some(ref text) = self.text {
result.push_str(text);
}
for child in &self.children {
result.push('\n');
result.push_str(&child.render());
}
if self.children.is_empty() && self.attr.is_empty() {
result.push_str(&format!("</{}>", self.name));
} else {
result.push_str(&format!("\n</{}>", self.name));
}
result
}
}
pub trait CanAppend {
fn append_to(self, element: Element) -> Element;
}
impl CanAppend for Element {
fn append_to(self, mut element: Element) -> Element {
element.children.push(self);
element
}
}
impl<T> CanAppend for T
where
T: IntoIterator<Item = Element>,
{
fn append_to(self, mut element: Element) -> Element {
for item in self {
element.children.push(item);
}
element
}
}
impl Display for Element {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str(&self.render())
}
}
#[cfg(test)]
mod test {
use pretty_assertions::assert_eq;
use super::*;
#[test]
fn test_element() {
let html = Element::new("div");
let actual = html.render();
let expected = "<div></div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_attributes() {
let html = Element::new("div").attr("class", "test");
let actual = html.render();
let expected = "<div\n class=\"test\"\n>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_children() {
let html = Element::new("div")
.attr("class", "test")
.append(Element::new("span"));
let actual = html.render();
let expected = "<div\n class=\"test\"\n>\n<span></span>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_multiple_children() {
let html = Element::new("div")
.attr("class", "test")
.append([Element::new("span"), Element::new("p")]);
let actual = html.render();
let expected = "<div\n class=\"test\"\n>\n<span></span>\n<p></p>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_nested_children() {
let html = Element::new("div").attr("class", "test").append([
Element::new("span").attr("class", "child"),
Element::new("p").attr("class", "child"),
]);
let actual = html.render();
let expected = "<div\n class=\"test\"\n>\n<span\n class=\"child\"\n>\n</span>\n<p\n class=\"child\"\n>\n</p>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_text() {
let html = Element::new("div")
.attr("class", "test")
.text("Hello, world!")
.append([Element::new("span").attr("class", "child")]);
let actual = html.render();
let expected =
"<div\n class=\"test\"\n>Hello, world!\n<span\n class=\"child\"\n>\n</span>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_multiple_classes() {
let html = Element::new("div")
.class("first-class")
.class("second-class");
let actual = html.render();
let expected = "<div\n class=\"first-class second-class\"\n>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_html_escape() {
let html = Element::new("div").text("<script>alert('XSS')</script>");
let actual = html.render();
let expected = "<div><script>alert('XSS')</script></div>";
assert_eq!(actual, expected);
}
#[test]
fn test_element_with_css_style_classes() {
let html = Element::new("div.foo.bar");
let actual = html.render();
let expected = "<div\n class=\"foo bar\"\n>\n</div>";
assert_eq!(actual, expected);
// Test that we can still add more classes
let html = Element::new("div.foo.bar").class("extra-class");
let actual = html.render();
let expected = "<div\n class=\"foo bar extra-class\"\n>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_append_if_some() {
let html = Element::new("div").append(Some(Element::new("span")));
let actual = html.render();
let expected = "<div>\n<span></span>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_append_if_none() {
let html = Element::new("div").append(None);
let actual = html.render();
let expected = "<div></div>";
assert_eq!(actual, expected);
}
#[test]
fn test_append_all() {
let elements = vec![
Element::new("span").text("First"),
Element::new("span").text("Second"),
Element::new("span").text("Third"),
];
let html = Element::new("div").append(elements);
let actual = html.render();
let expected = "<div>\n<span>First</span>\n<span>Second</span>\n<span>Third</span>\n</div>";
assert_eq!(actual, expected);
}
#[test]
fn test_append_all_empty() {
let elements: Vec<Element> = vec![];
let html = Element::new("div").append(elements);
let actual = html.render();
let expected = "<div></div>";
assert_eq!(actual, expected);
}
#[test]
fn test_append_all_with_iterator() {
let html =
Element::new("div").append((0..3).map(|i| Element::new("span").text(i.to_string())));
let actual = html.render();
let expected = "<div>\n<span>0</span>\n<span>1</span>\n<span>2</span>\n</div>";
assert_eq!(actual, expected);
}
}
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