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[Merged by Bors] - Refactor RegExp constructor methods #2049

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[Merged by Bors] - Refactor RegExp constructor methods #2049

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58 changes: 41 additions & 17 deletions boa_engine/src/builtins/regexp/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ use crate::{
internal_methods::get_prototype_from_constructor, ConstructorBuilder, FunctionBuilder,
JsObject, ObjectData,
},
property::Attribute,
property::{Attribute, PropertyDescriptorBuilder},
symbol::WellKnownSymbols,
syntax::lexer::regex::RegExpFlags,
value::{IntegerOrInfinity, JsValue},
Expand Down Expand Up @@ -223,10 +223,10 @@ impl RegExp {
};

// 7. Let O be ? RegExpAlloc(newTarget).
let o = Self::alloc(new_target, &[], context)?;
let o = Self::alloc(new_target, context)?;

// 8.Return ? RegExpInitialize(O, P, F).
Self::initialize(&o, &[p, f], context)
Self::initialize(o, &p, &f, context)
}

/// `22.2.3.2.1 RegExpAlloc ( newTarget )`
Expand All @@ -235,10 +235,26 @@ impl RegExp {
/// - [ECMAScript reference][spec]
///
/// [spec]: https://tc39.es/ecma262/#sec-regexpalloc
fn alloc(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
let proto = get_prototype_from_constructor(this, StandardConstructors::regexp, context)?;
fn alloc(new_target: &JsValue, context: &mut Context) -> JsResult<JsObject> {
// 1. Let obj be ? OrdinaryCreateFromConstructor(newTarget, "%RegExp.prototype%", « [[RegExpMatcher]], [[OriginalSource]], [[OriginalFlags]] »).
let proto =
get_prototype_from_constructor(new_target, StandardConstructors::regexp, context)?;
let obj = JsObject::from_proto_and_data(proto, ObjectData::ordinary());

// 2. Perform ! DefinePropertyOrThrow(obj, "lastIndex", PropertyDescriptor { [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: false }).
obj.define_property_or_throw(
"lastIndex",
PropertyDescriptorBuilder::new()
.writable(true)
.enumerable(false)
.configurable(false)
.build(),
context,
)
.expect("this cannot fail per spec");

Ok(JsObject::from_proto_and_data(proto, ObjectData::ordinary()).into())
// 3. Return obj.
Ok(obj)
}

/// `22.2.3.2.2 RegExpInitialize ( obj, pattern, flags )`
Expand All @@ -247,10 +263,12 @@ impl RegExp {
/// - [ECMAScript reference][spec]
///
/// [spec]: https://tc39.es/ecma262/#sec-regexpinitialize
fn initialize(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
let pattern = args.get_or_undefined(0);
let flags = args.get_or_undefined(1);

fn initialize(
obj: JsObject,
pattern: &JsValue,
flags: &JsValue,
context: &mut Context,
) -> JsResult<JsValue> {
// 1. If pattern is undefined, let P be the empty String.
// 2. Else, let P be ? ToString(pattern).
let p = if pattern.is_undefined() {
Expand All @@ -274,28 +292,35 @@ impl RegExp {
Ok(result) => result,
};

// TODO: Correct UTF-16 handling in 6. - 8.

// 9. Let parseResult be ParsePattern(patternText, u).
// 10. If parseResult is a non-empty List of SyntaxError objects, throw a SyntaxError exception.
// 11. Assert: parseResult is a Pattern Parse Node.
// 12. Set obj.[[OriginalSource]] to P.
// 13. Set obj.[[OriginalFlags]] to F.
// 14. Set obj.[[RegExpMatcher]] to the Abstract Closure that evaluates parseResult by applying the semantics provided in 22.2.2 using patternCharacters as the pattern's List of SourceCharacter values and F as the flag parameters.
// 14. NOTE: The definitions of DotAll, IgnoreCase, Multiline, and Unicode in 22.2.2.1 refer to this value of obj.[[OriginalFlags]].
// 15. Set obj.[[RegExpMatcher]] to CompilePattern of parseResult.
let matcher = match Regex::with_flags(&p, f.as_ref()) {
Err(error) => {
return context
.throw_syntax_error(format!("failed to create matcher: {}", error.text));
}
Ok(val) => val,
};

let regexp = Self {
matcher,
flags,
original_source: p,
original_flags: f,
};
obj.borrow_mut().data = ObjectData::reg_exp(Box::new(regexp));

this.set_data(ObjectData::reg_exp(Box::new(regexp)));
// 16. Perform ? Set(obj, "lastIndex", +0𝔽, true).
obj.set("lastIndex", 0, true, context)?;

// 16. Return obj.
Ok(this.clone())
Ok(obj.into())
}

/// `22.2.3.2.4 RegExpCreate ( P, F )`
Expand All @@ -304,16 +329,15 @@ impl RegExp {
/// - [ECMAScript reference][spec]
///
/// [spec]: https://tc39.es/ecma262/#sec-regexpcreate
pub(crate) fn create(p: JsValue, f: JsValue, context: &mut Context) -> JsResult<JsValue> {
pub(crate) fn create(p: &JsValue, f: &JsValue, context: &mut Context) -> JsResult<JsValue> {
// 1. Let obj be ? RegExpAlloc(%RegExp%).
let obj = Self::alloc(
&context.global_object().clone().get(Self::NAME, context)?,
&[],
context,
)?;

// 2. Return ? RegExpInitialize(obj, P, F).
Self::initialize(&obj, &[p, f], context)
Self::initialize(obj, p, f, context)
}

/// `get RegExp [ @@species ]`
Expand Down
6 changes: 3 additions & 3 deletions boa_engine/src/builtins/string/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1380,7 +1380,7 @@ impl String {
let s = o.to_string(context)?;

// 4. Let rx be ? RegExpCreate(regexp, undefined).
let rx = RegExp::create(regexp.clone(), JsValue::undefined(), context)?;
let rx = RegExp::create(regexp, &JsValue::Undefined, context)?;

// 5. Return ? Invoke(rx, @@match, « S »).
rx.invoke(WellKnownSymbols::r#match(), &[JsValue::new(s)], context)
Expand Down Expand Up @@ -1991,7 +1991,7 @@ impl String {
let s = o.to_string(context)?;

// 4. Let rx be ? RegExpCreate(regexp, "g").
let rx = RegExp::create(regexp.clone(), JsValue::new("g"), context)?;
let rx = RegExp::create(regexp, &JsValue::new("g"), context)?;

// 5. Return ? Invoke(rx, @@matchAll, « S »).
rx.invoke(WellKnownSymbols::match_all(), &[JsValue::new(s)], context)
Expand Down Expand Up @@ -2080,7 +2080,7 @@ impl String {
let string = o.to_string(context)?;

// 4. Let rx be ? RegExpCreate(regexp, undefined).
let rx = RegExp::create(regexp.clone(), JsValue::undefined(), context)?;
let rx = RegExp::create(regexp, &JsValue::Undefined, context)?;

// 5. Return ? Invoke(rx, @@search, « string »).
rx.invoke(WellKnownSymbols::search(), &[JsValue::new(string)], context)
Expand Down