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LibJS: Restructure and fully implement BindingPatterns

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This commit is contained in:
Matthew Olsson 2021-06-12 18:04:28 -07:00 • committed by Andreas Kling
parent 10372b8118
commit ce04c2259f
9 changed files with 244 additions and 169 deletions
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33
Userland/Libraries/LibJS/AST.h
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@ -215,12 +215,15 @@ public:
};
struct BindingPattern : RefCounted<BindingPattern> {
struct BindingProperty {
RefPtr<Identifier> name;
RefPtr<Identifier> alias;
RefPtr<BindingPattern> pattern;
RefPtr<Expression> initializer;
// This covers both BindingProperty and BindingElement, hence the more generic name
struct BindingEntry {
// If this entry represents a BindingElement, then name will be Empty
Variant<NonnullRefPtr<Identifier>, NonnullRefPtr<Expression>, Empty> name { Empty {} };
Variant<NonnullRefPtr<Identifier>, NonnullRefPtr<BindingPattern>, Empty> alias { Empty {} };
RefPtr<Expression> initializer {};
bool is_rest { false };
bool is_elision() const { return name.has<Empty>() && alias.has<Empty>(); }
};
enum class Kind {
@ -229,10 +232,11 @@ struct BindingPattern : RefCounted<BindingPattern> {
};
void dump(int indent) const;
template<typename C>
void for_each_assigned_name(C&& callback) const;
Vector<BindingProperty> properties;
template<typename C>
void for_each_bound_name(C&& callback) const;
Vector<BindingEntry> entries;
Kind kind { Kind::Object };
};
@ -1398,14 +1402,15 @@ public:
};
template<typename C>
void BindingPattern::for_each_assigned_name(C&& callback) const
void BindingPattern::for_each_bound_name(C&& callback) const
{
for (auto& property : properties) {
if (property.name) {
callback(property.name->string());
continue;
for (auto& entry : entries) {
auto& alias = entry.alias;
if (alias.has<NonnullRefPtr<Identifier>>()) {
callback(alias.get<NonnullRefPtr<Identifier>>()->string());
} else if (alias.has<NonnullRefPtr<BindingPattern>>()) {
alias.get<NonnullRefPtr<BindingPattern>>()->for_each_bound_name(forward<C>(callback));
}
property.pattern->template for_each_assigned_name(forward<C>(callback));
}
}