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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef AAPT_VALUE_VISITOR_H
#define AAPT_VALUE_VISITOR_H
#include "ResourceValues.h"
#include "ResourceTable.h"
namespace aapt {
/**
* Visits a value and invokes the appropriate method based on its type. Does not traverse
* into compound types. Use ValueVisitor for that.
*/
struct RawValueVisitor {
virtual ~RawValueVisitor() = default;
virtual void visitItem(Item* value) {}
virtual void visit(Reference* value) { visitItem(value); }
virtual void visit(RawString* value) { visitItem(value); }
virtual void visit(String* value) { visitItem(value); }
virtual void visit(StyledString* value) { visitItem(value); }
virtual void visit(FileReference* value) { visitItem(value); }
virtual void visit(Id* value) { visitItem(value); }
virtual void visit(BinaryPrimitive* value) { visitItem(value); }
virtual void visit(Attribute* value) {}
virtual void visit(Style* value) {}
virtual void visit(Array* value) {}
virtual void visit(Plural* value) {}
virtual void visit(Styleable* value) {}
};
#define DECL_VISIT_COMPOUND_VALUE(T) \
virtual void visit(T* value) { \
visitSubValues(value); \
}
/**
* Visits values, and if they are compound values, visits the components as well.
*/
struct ValueVisitor : public RawValueVisitor {
// The compiler will think we're hiding an overload, when we actually intend
// to call into RawValueVisitor. This will expose the visit methods in the super
// class so the compiler knows we are trying to call them.
using RawValueVisitor::visit;
void visitSubValues(Attribute* attribute) {
for (Attribute::Symbol& symbol : attribute->symbols) {
visit(&symbol.symbol);
}
}
void visitSubValues(Style* style) {
if (style->parent) {
visit(&style->parent.value());
}
for (Style::Entry& entry : style->entries) {
visit(&entry.key);
entry.value->accept(this);
}
}
void visitSubValues(Array* array) {
for (std::unique_ptr<Item>& item : array->items) {
item->accept(this);
}
}
void visitSubValues(Plural* plural) {
for (std::unique_ptr<Item>& item : plural->values) {
if (item) {
item->accept(this);
}
}
}
void visitSubValues(Styleable* styleable) {
for (Reference& reference : styleable->entries) {
visit(&reference);
}
}
DECL_VISIT_COMPOUND_VALUE(Attribute);
DECL_VISIT_COMPOUND_VALUE(Style);
DECL_VISIT_COMPOUND_VALUE(Array);
DECL_VISIT_COMPOUND_VALUE(Plural);
DECL_VISIT_COMPOUND_VALUE(Styleable);
};
/**
* Do not use directly. Helper struct for dyn_cast.
*/
template <typename T>
struct DynCastVisitor : public RawValueVisitor {
T* value = nullptr;
void visit(T* v) override {
value = v;
}
};
/**
* Specialization that checks if the value is an Item.
*/
template <>
struct DynCastVisitor<Item> : public RawValueVisitor {
Item* value = nullptr;
void visitItem(Item* item) override {
value = item;
}
};
/**
* Returns a valid pointer to T if the Value is of subtype T.
* Otherwise, returns nullptr.
*/
template <typename T>
T* valueCast(Value* value) {
if (!value) {
return nullptr;
}
DynCastVisitor<T> visitor;
value->accept(&visitor);
return visitor.value;
}
inline void visitAllValuesInPackage(ResourceTablePackage* pkg, RawValueVisitor* visitor) {
for (auto& type : pkg->types) {
for (auto& entry : type->entries) {
for (auto& configValue : entry->values) {
configValue->value->accept(visitor);
}
}
}
}
inline void visitAllValuesInTable(ResourceTable* table, RawValueVisitor* visitor) {
for (auto& pkg : table->packages) {
visitAllValuesInPackage(pkg.get(), visitor);
}
}
} // namespace aapt
#endif // AAPT_VALUE_VISITOR_H
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