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use crate::{
exec::Executable,
gc::{Finalize, Trace},
syntax::ast::node::Node,
Context, JsResult, JsValue,
};
use std::fmt;
#[cfg(feature = "deser")]
use serde::{Deserialize, Serialize};
/// This property accessor provides access to an object's properties by using the
/// [dot notation][mdn].
///
/// In the object.property syntax, the property must be a valid JavaScript identifier.
/// (In the ECMAScript standard, the names of properties are technically "IdentifierNames", not
/// "Identifiers", so reserved words can be used but are not recommended).
///
/// One can think of an object as an associative array (a.k.a. map, dictionary, hash, lookup
/// table). The keys in this array are the names of the object's properties.
///
/// It's typical when speaking of an object's properties to make a distinction between
/// properties and methods. However, the property/method distinction is little more than a
/// convention. A method is simply a property that can be called (for example, if it has a
/// reference to a Function instance as its value).
///
/// More information:
/// - [ECMAScript reference][spec]
/// - [MDN documentation][mdn]
///
/// [spec]: https://tc39.es/ecma262/#sec-property-accessors
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors#Dot_notation
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct GetConstField {
obj: Box<Node>,
field: Box<str>,
}
impl GetConstField {
/// Creates a `GetConstField` AST node.
pub fn new<V, L>(value: V, label: L) -> Self
where
V: Into<Node>,
L: Into<Box<str>>,
{
Self {
obj: Box::new(value.into()),
field: label.into(),
}
}
/// Gets the original object from where to get the field from.
pub fn obj(&self) -> &Node {
&self.obj
}
/// Gets the name of the field to retrieve.
pub fn field(&self) -> &str {
&self.field
}
}
impl Executable for GetConstField {
fn run(&self, context: &mut Context) -> JsResult<JsValue> {
let mut obj = self.obj().run(context)?;
if !obj.is_object() {
obj = JsValue::Object(obj.to_object(context)?);
}
obj.get_field(self.field(), context)
}
}
impl fmt::Display for GetConstField {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}.{}", self.obj(), self.field())
}
}
impl From<GetConstField> for Node {
fn from(get_const_field: GetConstField) -> Self {
Self::GetConstField(get_const_field)
}
}