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#[cfg(test)]
mod tests;
use crate::syntax::ast::node::{
declaration::{block_to_string, FunctionExpr},
join_nodes,
object::{MethodDefinition, PropertyName},
Node, StatementList,
};
use boa_interner::{Interner, Sym, ToInternedString};
#[cfg(feature = "deser")]
use serde::{Deserialize, Serialize};
/// The `class` declaration defines a class with the specified methods, fields, and optional constructor.
///
/// Classes can be used to create objects, which can also be created through literals (using `{}`).
///
/// More information:
/// - [ECMAScript reference][spec]
/// - [MDN documentation][mdn]
///
/// [spec]: https://tc39.es/ecma262/#sec-class-definitions
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, PartialEq)]
pub struct Class {
name: Sym,
super_ref: Option<Box<Node>>,
constructor: Option<FunctionExpr>,
elements: Box<[ClassElement]>,
}
impl Class {
/// Creates a new class declaration.
pub(in crate::syntax) fn new<S, C, E>(
name: Sym,
super_ref: S,
constructor: C,
elements: E,
) -> Self
where
S: Into<Option<Box<Node>>>,
C: Into<Option<FunctionExpr>>,
E: Into<Box<[ClassElement]>>,
{
Self {
name,
super_ref: super_ref.into(),
constructor: constructor.into(),
elements: elements.into(),
}
}
/// Returns the name of the class.
pub(crate) fn name(&self) -> Sym {
self.name
}
/// Returns the super class ref of the class.
pub(crate) fn super_ref(&self) -> &Option<Box<Node>> {
&self.super_ref
}
/// Returns the constructor of the class.
pub(crate) fn constructor(&self) -> &Option<FunctionExpr> {
&self.constructor
}
/// Gets the list of all fields defined on the class.
pub(crate) fn elements(&self) -> &[ClassElement] {
&self.elements
}
/// Implements the display formatting with indentation.
pub(in crate::syntax::ast::node) fn to_indented_string(
&self,
interner: &Interner,
indent_n: usize,
) -> String {
if self.elements.is_empty() && self.constructor().is_none() {
return format!(
"class {}{} {{}}",
interner.resolve_expect(self.name),
if let Some(node) = &self.super_ref {
format!(" extends {}", node.to_interned_string(interner))
} else {
"".to_string()
}
);
}
let indentation = " ".repeat(indent_n + 1);
let mut buf = format!(
"class {}{} {{\n",
interner.resolve_expect(self.name),
if let Some(node) = &self.super_ref {
format!("extends {}", node.to_interned_string(interner))
} else {
"".to_string()
}
);
if let Some(expr) = &self.constructor {
buf.push_str(&format!(
"{indentation}constructor({}) {}\n",
join_nodes(interner, &expr.parameters().parameters),
block_to_string(expr.body(), interner, indent_n + 1)
));
}
for element in self.elements.iter() {
buf.push_str(&match element {
ClassElement::MethodDefinition(name, method) => {
format!(
"{indentation}{}{}({}) {}\n",
match &method {
MethodDefinition::Get(_) => "get ",
MethodDefinition::Set(_) => "set ",
_ => "",
},
name.to_interned_string(interner),
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Generator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::AsyncGenerator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Async(node) => {
join_nodes(interner, &node.parameters().parameters)
}
},
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Generator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::AsyncGenerator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Async(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
},
)
}
ClassElement::StaticMethodDefinition(name, method) => {
format!(
"{indentation}static {}{}({}) {}\n",
match &method {
MethodDefinition::Get(_) => "get ",
MethodDefinition::Set(_) => "set ",
_ => "",
},
name.to_interned_string(interner),
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Generator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::AsyncGenerator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Async(node) => {
join_nodes(interner, &node.parameters().parameters)
}
},
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Generator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::AsyncGenerator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Async(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
},
)
}
ClassElement::FieldDefinition(name, field) => match field {
Some(node) => {
format!(
"{indentation}{} = {};\n",
name.to_interned_string(interner),
node.to_no_indent_string(interner, indent_n + 1)
)
}
None => {
format!("{indentation}{};\n", name.to_interned_string(interner),)
}
},
ClassElement::StaticFieldDefinition(name, field) => match field {
Some(node) => {
format!(
"{indentation}static {} = {};\n",
name.to_interned_string(interner),
node.to_no_indent_string(interner, indent_n + 1)
)
}
None => {
format!(
"{indentation}static {};\n",
name.to_interned_string(interner),
)
}
},
ClassElement::PrivateMethodDefinition(name, method) => {
format!(
"{indentation}{}#{}({}) {}\n",
match &method {
MethodDefinition::Get(_) => "get ",
MethodDefinition::Set(_) => "set ",
_ => "",
},
interner.resolve_expect(*name),
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Generator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::AsyncGenerator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Async(node) => {
join_nodes(interner, &node.parameters().parameters)
}
},
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Generator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::AsyncGenerator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Async(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
},
)
}
ClassElement::PrivateStaticMethodDefinition(name, method) => {
format!(
"{indentation}static {}#{}({}) {}\n",
match &method {
MethodDefinition::Get(_) => "get ",
MethodDefinition::Set(_) => "set ",
_ => "",
},
interner.resolve_expect(*name),
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Generator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::AsyncGenerator(node) => {
join_nodes(interner, &node.parameters().parameters)
}
MethodDefinition::Async(node) => {
join_nodes(interner, &node.parameters().parameters)
}
},
match &method {
MethodDefinition::Get(node)
| MethodDefinition::Set(node)
| MethodDefinition::Ordinary(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Generator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::AsyncGenerator(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
MethodDefinition::Async(node) => {
block_to_string(node.body(), interner, indent_n + 1)
}
},
)
}
ClassElement::PrivateFieldDefinition(name, field) => match field {
Some(node) => {
format!(
"{indentation}#{} = {};\n",
interner.resolve_expect(*name),
node.to_no_indent_string(interner, indent_n + 1)
)
}
None => {
format!("{indentation}#{};\n", interner.resolve_expect(*name),)
}
},
ClassElement::PrivateStaticFieldDefinition(name, field) => match field {
Some(node) => {
format!(
"{indentation}static #{} = {};\n",
interner.resolve_expect(*name),
node.to_no_indent_string(interner, indent_n + 1)
)
}
None => {
format!("{indentation}static #{};\n", interner.resolve_expect(*name),)
}
},
ClassElement::StaticBlock(statement_list) => {
format!(
"{indentation}static {}\n",
block_to_string(statement_list, interner, indent_n + 1)
)
}
});
}
buf.push('}');
buf
}
}
impl ToInternedString for Class {
fn to_interned_string(&self, interner: &Interner) -> String {
self.to_indented_string(interner, 0)
}
}
/// Class element types.
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, PartialEq)]
pub enum ClassElement {
MethodDefinition(PropertyName, MethodDefinition),
StaticMethodDefinition(PropertyName, MethodDefinition),
FieldDefinition(PropertyName, Option<Node>),
StaticFieldDefinition(PropertyName, Option<Node>),
PrivateMethodDefinition(Sym, MethodDefinition),
PrivateStaticMethodDefinition(Sym, MethodDefinition),
PrivateFieldDefinition(Sym, Option<Node>),
PrivateStaticFieldDefinition(Sym, Option<Node>),
StaticBlock(StatementList),
}