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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_RESOURCE_VALUES_H
#define AAPT_RESOURCE_VALUES_H
#include <array>
#include <limits>
#include <ostream>
#include <vector>
#include "androidfw/ResourceTypes.h"
#include "androidfw/StringPiece.h"
#include "Diagnostics.h"
#include "Resource.h"
#include "StringPool.h"
#include "io/File.h"
#include "text/Printer.h"
#include "util/Maybe.h"
namespace aapt {
class ValueVisitor;
class ConstValueVisitor;
// A resource value. This is an all-encompassing representation
// of Item and Map and their subclasses. The way to do
// type specific operations is to check the Value's type() and
// cast it to the appropriate subclass. This isn't super clean,
// but it is the simplest strategy.
class Value {
public:
virtual ~Value() = default;
// Whether this value is weak and can be overridden without warning or error. Default is false.
bool IsWeak() const {
return weak_;
}
void SetWeak(bool val) {
weak_ = val;
}
// Whether the value is marked as translatable. This does not persist when flattened to binary.
// It is only used during compilation phase.
void SetTranslatable(bool val) {
translatable_ = val;
}
// Default true.
bool IsTranslatable() const {
return translatable_;
}
// Returns the source where this value was defined.
const Source& GetSource() const {
return source_;
}
void SetSource(const Source& source) {
source_ = source;
}
void SetSource(Source&& source) {
source_ = std::move(source);
}
// Returns the comment that was associated with this resource.
const std::string& GetComment() const {
return comment_;
}
void SetComment(const android::StringPiece& str) {
comment_ = str.to_string();
}
void SetComment(std::string&& str) {
comment_ = std::move(str);
}
virtual bool Equals(const Value* value) const = 0;
// Calls the appropriate overload of ValueVisitor.
virtual void Accept(ValueVisitor* visitor) = 0;
// Calls the appropriate overload of ConstValueVisitor.
virtual void Accept(ConstValueVisitor* visitor) const = 0;
// Clone the value. `new_pool` is the new StringPool that
// any resources with strings should use when copying their string.
virtual Value* Clone(StringPool* new_pool) const = 0;
// Human readable printout of this value.
virtual void Print(std::ostream* out) const = 0;
// Human readable printout of this value that may omit some information for the sake
// of brevity and readability. Default implementation just calls Print().
virtual void PrettyPrint(text::Printer* printer) const;
friend std::ostream& operator<<(std::ostream& out, const Value& value);
protected:
Source source_;
std::string comment_;
bool weak_ = false;
bool translatable_ = true;
};
// Inherit from this to get visitor accepting implementations for free.
template <typename Derived>
struct BaseValue : public Value {
void Accept(ValueVisitor* visitor) override;
void Accept(ConstValueVisitor* visitor) const override;
};
// A resource item with a single value. This maps to android::ResTable_entry.
struct Item : public Value {
// Clone the Item.
virtual Item* Clone(StringPool* new_pool) const override = 0;
// Fills in an android::Res_value structure with this Item's binary representation.
// Returns false if an error occurred.
virtual bool Flatten(android::Res_value* out_value) const = 0;
};
// Inherit from this to get visitor accepting implementations for free.
template <typename Derived>
struct BaseItem : public Item {
void Accept(ValueVisitor* visitor) override;
void Accept(ConstValueVisitor* visitor) const override;
};
// A reference to another resource. This maps to android::Res_value::TYPE_REFERENCE.
// A reference can be symbolic (with the name set to a valid resource name) or be
// numeric (the id is set to a valid resource ID).
struct Reference : public BaseItem<Reference> {
enum class Type {
kResource,
kAttribute,
};
Maybe<ResourceName> name;
Maybe<ResourceId> id;
Reference::Type reference_type;
bool private_reference = false;
bool is_dynamic = false;
Reference();
explicit Reference(const ResourceNameRef& n, Type type = Type::kResource);
explicit Reference(const ResourceId& i, Type type = Type::kResource);
Reference(const ResourceNameRef& n, const ResourceId& i);
bool Equals(const Value* value) const override;
bool Flatten(android::Res_value* out_value) const override;
Reference* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
void PrettyPrint(text::Printer* printer) const override;
// Prints the reference without a package name if the package name matches the one given.
void PrettyPrint(const android::StringPiece& package, text::Printer* printer) const;
};
bool operator<(const Reference&, const Reference&);
bool operator==(const Reference&, const Reference&);
// An ID resource. Has no real value, just a place holder.
struct Id : public BaseItem<Id> {
Id() {
weak_ = true;
}
bool Equals(const Value* value) const override;
bool Flatten(android::Res_value* out) const override;
Id* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
};
// A raw, unprocessed string. This may contain quotations, escape sequences, and whitespace.
// This shall *NOT* end up in the final resource table.
struct RawString : public BaseItem<RawString> {
StringPool::Ref value;
explicit RawString(const StringPool::Ref& ref);
bool Equals(const Value* value) const override;
bool Flatten(android::Res_value* out_value) const override;
RawString* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
};
// Identifies a range of characters in a string that are untranslatable.
// These should not be pseudolocalized. The start and end indices are measured in bytes.
struct UntranslatableSection {
// Start offset inclusive.
size_t start;
// End offset exclusive.
size_t end;
};
inline bool operator==(const UntranslatableSection& a, const UntranslatableSection& b) {
return a.start == b.start && a.end == b.end;
}
inline bool operator!=(const UntranslatableSection& a, const UntranslatableSection& b) {
return a.start != b.start || a.end != b.end;
}
struct String : public BaseItem<String> {
StringPool::Ref value;
// Sections of the string to NOT translate. Mainly used
// for pseudolocalization. This data is NOT persisted
// in any format.
std::vector<UntranslatableSection> untranslatable_sections;
explicit String(const StringPool::Ref& ref);
bool Equals(const Value* value) const override;
bool Flatten(android::Res_value* out_value) const override;
String* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
void PrettyPrint(text::Printer* printer) const override;
};
struct StyledString : public BaseItem<StyledString> {
StringPool::StyleRef value;
// Sections of the string to NOT translate. Mainly used
// for pseudolocalization. This data is NOT persisted
// in any format.
std::vector<UntranslatableSection> untranslatable_sections;
explicit StyledString(const StringPool::StyleRef& ref);
bool Equals(const Value* value) const override;
bool Flatten(android::Res_value* out_value) const override;
StyledString* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
};
struct FileReference : public BaseItem<FileReference> {
StringPool::Ref path;
// A handle to the file object from which this file can be read.
// This field is NOT persisted in any format. It is transient.
io::IFile* file = nullptr;
// FileType of the file pointed to by `file`. This is used to know how to inflate the file,
// or if to inflate at all (just copy).
ResourceFile::Type type = ResourceFile::Type::kUnknown;
FileReference() = default;
explicit FileReference(const StringPool::Ref& path);
bool Equals(const Value* value) const override;
bool Flatten(android::Res_value* out_value) const override;
FileReference* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
};
// Represents any other android::Res_value.
struct BinaryPrimitive : public BaseItem<BinaryPrimitive> {
android::Res_value value;
BinaryPrimitive() = default;
explicit BinaryPrimitive(const android::Res_value& val);
BinaryPrimitive(uint8_t dataType, uint32_t data);
bool Equals(const Value* value) const override;
bool Flatten(android::Res_value* out_value) const override;
BinaryPrimitive* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
void PrettyPrint(text::Printer* printer) const override;
};
struct Attribute : public BaseValue<Attribute> {
struct Symbol {
Reference symbol;
uint32_t value;
friend std::ostream& operator<<(std::ostream& out, const Symbol& symbol);
};
uint32_t type_mask;
int32_t min_int;
int32_t max_int;
std::vector<Symbol> symbols;
explicit Attribute(uint32_t t = 0u);
bool Equals(const Value* value) const override;
// Returns true if this Attribute's format is compatible with the given Attribute. The basic
// rule is that TYPE_REFERENCE can be ignored for both of the Attributes, and TYPE_FLAGS and
// TYPE_ENUMS are never compatible.
bool IsCompatibleWith(const Attribute& attr) const;
Attribute* Clone(StringPool* new_pool) const override;
std::string MaskString() const;
void Print(std::ostream* out) const override;
bool Matches(const Item& item, DiagMessage* out_msg = nullptr) const;
};
struct Style : public BaseValue<Style> {
struct Entry {
Reference key;
std::unique_ptr<Item> value;
friend std::ostream& operator<<(std::ostream& out, const Entry& entry);
};
Maybe<Reference> parent;
// If set to true, the parent was auto inferred from the style's name.
bool parent_inferred = false;
std::vector<Entry> entries;
bool Equals(const Value* value) const override;
Style* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
// Merges `style` into this Style. All identical attributes of `style` take precedence, including
// the parent, if there is one.
void MergeWith(Style* style, StringPool* pool);
};
struct Array : public BaseValue<Array> {
std::vector<std::unique_ptr<Item>> elements;
bool Equals(const Value* value) const override;
Array* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
};
struct Plural : public BaseValue<Plural> {
enum { Zero = 0, One, Two, Few, Many, Other, Count };
std::array<std::unique_ptr<Item>, Count> values;
bool Equals(const Value* value) const override;
Plural* Clone(StringPool* new_pool) const override;
void Print(std::ostream* out) const override;
};
struct Styleable : public BaseValue<Styleable> {
std::vector<Reference> entries;
bool Equals(const Value* value) const override;
Styleable* Clone(StringPool* newPool) const override;
void Print(std::ostream* out) const override;
void MergeWith(Styleable* styleable);
};
template <typename T>
typename std::enable_if<std::is_base_of<Value, T>::value, std::ostream&>::type operator<<(
std::ostream& out, const std::unique_ptr<T>& value) {
if (value == nullptr) {
out << "NULL";
} else {
value->Print(&out);
}
return out;
}
} // namespace aapt
#endif // AAPT_RESOURCE_VALUES_H