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use std::cell::RefCell;
use std::fmt::Write;
use std::fs::read_to_string;
use std::path::PathBuf;
use std::rc::Rc;
use anyhow::Result;
use anyhow::anyhow;
use kuchikiki::{
NodeRef,
traits::TendrilSink,
};
use mlua::{Lua, Table};
fn create_luahtml_stdlib(l: &Lua, stdout: &Rc<RefCell<String>>) -> mlua::Result<Table> {
let t = l.create_table()?;
// This cannot be the best way to do this
let stdout_println = stdout.clone();
t.set(
"println",
l.create_function(move |_, text: String| {
let mut stdout_ref = stdout_println.borrow_mut();
writeln!(stdout_ref, "{text}").map_err(mlua::Error::external)
})?,
)?;
let stdout_print = stdout.clone();
t.set(
"print",
l.create_function(move |_, text: String| {
let mut stdout_ref = stdout_print.borrow_mut();
write!(stdout_ref, "{text}").map_err(mlua::Error::external)
})?,
)?;
Ok(t)
}
pub fn execute_lua(document: NodeRef) -> Result<NodeRef> {
let lua = Lua::new();
let globals = lua.globals();
let stdout: Rc<RefCell<String>> = Rc::new(RefCell::new(String::new()));
let htmlua_table = create_luahtml_stdlib(&lua, &stdout)
.map_err(|e| anyhow!("Failed to create Lua stdlib: {}", e))?;
globals
.set("htmlua", htmlua_table)
.map_err(|e| anyhow!("Failed to set global: {}", e))?;
let lua_elements: Vec<_> = match document.select("lua") {
Ok(e) => e.collect(),
Err(()) => return Err(anyhow!("Unable to find Lua")),
};
for node in lua_elements {
if let Some(text_node) = node.as_node().first_child() {
if let Some(lua_code) = text_node.as_text() {
stdout.borrow_mut().clear();
lua.load(lua_code.borrow().as_str())
.exec()
.map_err(|e| anyhow!("Failed to execute Lua: {}", e))?;
node.as_node()
.insert_before(NodeRef::new_text(stdout.borrow().as_str()));
node.as_node().detach();
}
}
}
Ok(document)
}
pub fn expand_template(document: NodeRef, component_path: &PathBuf, include_from: Option<&NodeRef>) -> Result<NodeRef> {
if let Some(from_node) = include_from {
for i in document.select("includeelement").map_err(|()| anyhow!("Error finding includeelement"))? {
if let Some(name) = i.attributes.borrow().get("name") {
let exported = from_node.select_first(format!("exportelement.{name}").as_str()).map_err(|()| anyhow!("Error finding exportelement"))?;
exported.as_node().children().for_each(|c| i.as_node().insert_after(c));
}
}
while let Ok(i) = document.select_first("includeelement") {
i.as_node().detach();
}
}
for i in document.select("include").map_err(|()| anyhow!("Error finding include"))? {
let attrs = match i.as_node().as_element() {
Some(e) => e.attributes.borrow(),
None => continue,
};
if let Some(include_path) = attrs.get("path") {
let mut item_path = component_path.clone();
item_path.push(include_path);
let component_text = read_to_string(item_path)?;
let new_node = kuchikiki::parse_html().one(component_text);
let replaced_node = expand_template(new_node, component_path, Some(i.as_node()))?;
i.as_node().insert_before(replaced_node);
i.as_node().detach();
}
}
Ok(document)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn basic_lua() {
let page = r#"
<!DOCTYPE html>
<html>
<head>
<title>Basic HTML Page</title>
</head>
<body>
<h1>Hello World</h1>
<p>This is a paragraph.</p>
<span><lua>
htmlua.println("Test from Lua!")
</lua></span>
</body>
</html>"#;
let document = kuchikiki::parse_html().one(page);
let d = execute_lua(document).unwrap();
let text = d.select_first("span").unwrap().as_node().text_contents();
assert_eq!(text, "Test from Lua!\n");
assert!(d.select_first("lua").is_err());
}
#[test]
fn multiple_lua() {
let page = r#"
<!DOCTYPE html>
<html>
<head>
<title>Basic HTML Page</title>
</head>
<body>
<h1>Hello World</h1>
<p>This is a paragraph.</p>
<span id="ta"><lua>
htmlua.println("Test from Lua!")
</lua></span>
<div>
<span id="tb"><lua>htmlua.println("test 2")</lua></span>
</div>
</body>
</html>"#;
let document = kuchikiki::parse_html().one(page);
let d = execute_lua(document).unwrap();
let text = d.select_first("#ta").unwrap().as_node().text_contents();
assert_eq!(text, "Test from Lua!\n");
let text = d.select_first("#tb").unwrap().as_node().text_contents();
assert_eq!(text, "test 2\n");
assert!(d.select_first("lua").is_err());
}
#[test]
fn basic_include() {
let page = r#"
<!DOCTYPE html>
<html>
<head>
<title>Basic HTML Page</title>
</head>
<body>
<h1>Hello World</h1>
<p>This is a paragraph.</p>
<include path="comp1.html" />
<span><lua>
htmlua.println("Test from Lua!")
</lua></span>
</body>
</html>"#;
let mut p = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
p.push("tests/components");
let document = kuchikiki::parse_html().one(page);
let d = expand_template(document, &p, None).unwrap();
let text = d.select_first("span").unwrap().as_node().text_contents();
assert_eq!(text, "included1");
assert!(d.select_first("include").is_err());
}
#[test]
fn recursive_include() {
let page = r#"
<!DOCTYPE html>
<html>
<head>
<title>Basic HTML Page</title>
</head>
<body>
<h1>Hello World</h1>
<include path="comp2_level1.html" />
</body>
</html>"#;
let mut p = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
p.push("tests/components");
let document = kuchikiki::parse_html().one(page);
let d = expand_template(document, &p, None).unwrap();
let text = d.select_first("span").unwrap().as_node().text_contents();
assert_eq!(text, "included_twice");
assert!(d.select_first("include").is_err());
}
#[test]
fn export_element_include() {
let page = r#"
<!DOCTYPE html>
<html>
<head>
<title>Basic HTML Page</title>
</head>
<body>
<h1>Hello World</h1>
<include path="with_include1.html">
<exportelement class="el1"><span id="ta">element 1</span></exportelement>
<exportelement class="el2"><span id="tb">element 2</span></exportelement>
</include>
</body>
</html>"#;
let mut p = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
p.push("tests/components");
let document = kuchikiki::parse_html().one(page);
let d = expand_template(document, &p, None).unwrap();
let text = d.select_first("#ta").unwrap().as_node().text_contents();
assert_eq!(text, "element 1");
let text = d.select_first("#tb").unwrap().as_node().text_contents();
assert_eq!(text, "element 2");
assert!(d.select_first("exportelement").is_err());
assert!(d.select_first("includeelement").is_err());
}
}
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