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LibJS: Implement parsing and execution of optional chains

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Ali Mohammad Pur 2021-09-14 06:56:31 +04:30 • committed by Linus Groh
parent 4f7e14e0aa
commit 72ddaa31e3
6 changed files with 318 additions and 42 deletions
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64
Userland/Libraries/LibJS/AST.h
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@ -17,6 +17,7 @@
#include <AK/Vector.h>
#include <LibJS/Forward.h>
#include <LibJS/Runtime/PropertyName.h>
#include <LibJS/Runtime/Reference.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/SourceRange.h>
#include <LibRegex/Regex.h>
@ -1069,7 +1070,7 @@ private:
Value callee;
};
ThisAndCallee compute_this_and_callee(Interpreter&, GlobalObject&) const;
ThisAndCallee compute_this_and_callee(Interpreter&, GlobalObject&, Reference const&) const;
};
class NewExpression final : public CallExpression {
@ -1384,6 +1385,50 @@ private:
bool m_computed { false };
};
class OptionalChain final : public Expression {
public:
enum class Mode {
Optional,
NotOptional,
};
struct Call {
Vector<CallExpression::Argument> arguments;
Mode mode;
};
struct ComputedReference {
NonnullRefPtr<Expression> expression;
Mode mode;
};
struct MemberReference {
NonnullRefPtr<Identifier> identifier;
Mode mode;
};
using Reference = Variant<Call, ComputedReference, MemberReference>;
OptionalChain(SourceRange source_range, NonnullRefPtr<Expression> base, Vector<Reference> references)
: Expression(source_range)
, m_base(move(base))
, m_references(move(references))
{
}
virtual Value execute(Interpreter& interpreter, GlobalObject& global_object) const override;
virtual JS::Reference to_reference(Interpreter& interpreter, GlobalObject& global_object) const override;
virtual void dump(int indent) const override;
private:
struct ReferenceAndValue {
JS::Reference reference;
Value value;
};
Optional<ReferenceAndValue> to_reference_and_value(Interpreter&, GlobalObject&) const;
NonnullRefPtr<Expression> m_base;
Vector<Reference> m_references;
};
class MetaProperty final : public Expression {
public:
enum class Type {
@ -1576,6 +1621,23 @@ public:
virtual void generate_bytecode(Bytecode::Generator&) const override;
};
class SyntheticReferenceExpression final : public Expression {
public:
explicit SyntheticReferenceExpression(SourceRange source_range, Reference reference, Value value)
: Expression(source_range)
, m_reference(move(reference))
, m_value(value)
{
}
virtual Value execute(Interpreter&, GlobalObject&) const override { return m_value; }
virtual Reference to_reference(Interpreter&, GlobalObject&) const override { return m_reference; }
private:
Reference m_reference;
Value m_value;
};
template<typename C>
void BindingPattern::for_each_bound_name(C&& callback) const
{