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@ -16,6 +16,7 @@ mod tests;
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use crate::{ |
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builtins::array::array_iterator::{ArrayIterationKind, ArrayIterator}, |
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builtins::BuiltIn, |
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gc::GcObject, |
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object::{ConstructorBuilder, FunctionBuilder, ObjectData, PROTOTYPE}, |
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property::{Attribute, DataDescriptor}, |
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value::{same_value_zero, Value}, |
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@ -100,8 +101,90 @@ impl Array {
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const LENGTH: usize = 1; |
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fn constructor(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
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// Set Prototype
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// Delegate to the appropriate constructor based on the number of arguments
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match args.len() { |
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0 => Array::construct_array_empty(this, context), |
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1 => Array::construct_array_length(this, &args[0], context), |
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_ => Array::construct_array_values(this, args, context), |
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} |
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} |
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/// No argument constructor for `Array`.
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///
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/// More information:
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/// - [ECMAScript reference][spec]
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///
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/// [spec]: https://tc39.es/ecma262/#sec-array-constructor-array
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fn construct_array_empty(this: &Value, context: &mut Context) -> Result<Value> { |
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let prototype = context.standard_objects().array_object().prototype(); |
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Array::array_create(this, 0, Some(prototype), context) |
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} |
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/// By length constructor for `Array`.
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///
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/// More information:
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/// - [ECMAScript reference][spec]
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///
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/// [spec]: https://tc39.es/ecma262/#sec-array-len
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fn construct_array_length( |
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this: &Value, |
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length: &Value, |
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context: &mut Context, |
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) -> Result<Value> { |
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let prototype = context.standard_objects().array_object().prototype(); |
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let array = Array::array_create(this, 0, Some(prototype), context)?; |
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if !length.is_number() { |
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array.set_field(0, Value::from(length)); |
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array.set_field("length", Value::from(1)); |
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} else { |
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if length.is_double() { |
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return context.throw_range_error("Invalid array length"); |
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} |
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array.set_field("length", Value::from(length.to_u32(context).unwrap())); |
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} |
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Ok(array) |
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} |
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/// From items constructor for `Array`.
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///
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/// More information:
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/// - [ECMAScript reference][spec]
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///
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/// [spec]: https://tc39.es/ecma262/#sec-array-items
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fn construct_array_values( |
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this: &Value, |
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items: &[Value], |
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context: &mut Context, |
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) -> Result<Value> { |
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let prototype = context.standard_objects().array_object().prototype(); |
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let array = Array::array_create(this, items.len() as u32, Some(prototype), context)?; |
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for (k, item) in items.iter().enumerate() { |
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array.set_field(k, item.clone()); |
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} |
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Ok(array) |
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} |
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/// Utility for constructing `Array` objects.
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///
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/// More information:
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/// - [ECMAScript reference][spec]
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///
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/// [spec]: https://tc39.es/ecma262/#sec-arraycreate
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fn array_create( |
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this: &Value, |
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length: u32, |
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prototype: Option<GcObject>, |
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context: &mut Context, |
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) -> Result<Value> { |
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let prototype = match prototype { |
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Some(prototype) => prototype, |
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None => context.standard_objects().array_object().prototype(), |
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}; |
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this.as_object_mut() |
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.expect("this should be an array object") |
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@ -110,33 +193,11 @@ impl Array {
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// to its Javascript Identifier (global constructor method name)
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this.set_data(ObjectData::Array); |
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// add our arguments in
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let mut length = args.len() as i32; |
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match args.len() { |
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1 if args[0].is_integer() => { |
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length = args[0].as_number().unwrap() as i32; |
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// TODO: It should not create an array of undefineds, but an empty array ("holy" array in V8) with length `n`.
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for n in 0..length { |
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this.set_field(n, Value::undefined()); |
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} |
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} |
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1 if args[0].is_double() => { |
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return context.throw_range_error("invalid array length"); |
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} |
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_ => { |
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for (n, value) in args.iter().enumerate() { |
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this.set_field(n, value.clone()); |
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} |
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} |
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} |
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// finally create length property
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let length = DataDescriptor::new( |
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length, |
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Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::PERMANENT, |
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); |
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this.set_property("length".to_string(), length); |
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this.set_property("length", length); |
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Ok(this.clone()) |
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} |
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