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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.
*/
#include "JavaClassGenerator.h"
#include "Resource.h"
#include "ResourceTable.h"
#include "ResourceValues.h"
#include "StringPiece.h"
#include <algorithm>
#include <ostream>
#include <set>
#include <sstream>
#include <tuple>
namespace aapt {
// The number of attributes to emit per line in a Styleable array.
constexpr size_t kAttribsPerLine = 4;
JavaClassGenerator::JavaClassGenerator(std::shared_ptr<const ResourceTable> table,
Options options) :
mTable(table), mOptions(options) {
}
static void generateHeader(std::ostream& out, const StringPiece16& package) {
out << "/* AUTO-GENERATED FILE. DO NOT MODIFY.\n"
" *\n"
" * This class was automatically generated by the\n"
" * aapt tool from the resource data it found. It\n"
" * should not be modified by hand.\n"
" */\n\n";
out << "package " << package << ";"
<< std::endl
<< std::endl;
}
static const std::set<StringPiece16> sJavaIdentifiers = {
u"abstract", u"assert", u"boolean", u"break", u"byte",
u"case", u"catch", u"char", u"class", u"const", u"continue",
u"default", u"do", u"double", u"else", u"enum", u"extends",
u"final", u"finally", u"float", u"for", u"goto", u"if",
u"implements", u"import", u"instanceof", u"int", u"interface",
u"long", u"native", u"new", u"package", u"private", u"protected",
u"public", u"return", u"short", u"static", u"strictfp", u"super",
u"switch", u"synchronized", u"this", u"throw", u"throws",
u"transient", u"try", u"void", u"volatile", u"while", u"true",
u"false", u"null"
};
static bool isValidSymbol(const StringPiece16& symbol) {
return sJavaIdentifiers.find(symbol) == sJavaIdentifiers.end();
}
/*
* Java symbols can not contain . or -, but those are valid in a resource name.
* Replace those with '_'.
*/
static std::u16string transform(const StringPiece16& symbol) {
std::u16string output = symbol.toString();
for (char16_t& c : output) {
if (c == u'.' || c == u'-') {
c = u'_';
}
}
return output;
}
bool JavaClassGenerator::generateType(std::ostream& out, const ResourceTableType& type,
size_t packageId) {
const StringPiece finalModifier = mOptions.useFinal ? " final" : "";
for (const auto& entry : type.entries) {
ResourceId id = { packageId, type.typeId, entry->entryId };
assert(id.isValid());
if (!isValidSymbol(entry->name)) {
std::stringstream err;
err << "invalid symbol name '"
<< StringPiece16(entry->name)
<< "'";
mError = err.str();
return false;
}
out << " "
<< "public static" << finalModifier
<< " int " << transform(entry->name) << " = " << id << ";" << std::endl;
}
return true;
}
struct GenArgs : ValueVisitorArgs {
GenArgs(std::ostream& o, const ResourceEntry& e) : out(o), entry(e) {
}
std::ostream& out;
const ResourceEntry& entry;
};
void JavaClassGenerator::visit(const Styleable& styleable, ValueVisitorArgs& a) {
const StringPiece finalModifier = mOptions.useFinal ? " final" : "";
std::ostream& out = static_cast<GenArgs&>(a).out;
const ResourceEntry& entry = static_cast<GenArgs&>(a).entry;
// This must be sorted by resource ID.
std::vector<std::pair<ResourceId, StringPiece16>> sortedAttributes;
sortedAttributes.reserve(styleable.entries.size());
for (const auto& attr : styleable.entries) {
assert(attr.id.isValid() && "no ID set for Styleable entry");
assert(attr.name.isValid() && "no name set for Styleable entry");
sortedAttributes.emplace_back(attr.id, attr.name.entry);
}
std::sort(sortedAttributes.begin(), sortedAttributes.end());
// First we emit the array containing the IDs of each attribute.
out << " "
<< "public static final int[] " << transform(entry.name) << " = {";
const size_t attrCount = sortedAttributes.size();
for (size_t i = 0; i < attrCount; i++) {
if (i % kAttribsPerLine == 0) {
out << std::endl << " ";
}
out << sortedAttributes[i].first;
if (i != attrCount - 1) {
out << ", ";
}
}
out << std::endl << " };" << std::endl;
// Now we emit the indices into the array.
for (size_t i = 0; i < attrCount; i++) {
out << " "
<< "public static" << finalModifier
<< " int " << transform(entry.name) << "_" << transform(sortedAttributes[i].second)
<< " = " << i << ";" << std::endl;
}
}
bool JavaClassGenerator::generate(std::ostream& out) {
const size_t packageId = mTable->getPackageId();
generateHeader(out, mTable->getPackage());
out << "public final class R {" << std::endl;
for (const auto& type : *mTable) {
out << " public static final class " << type->type << " {" << std::endl;
bool result;
if (type->type == ResourceType::kStyleable) {
for (const auto& entry : type->entries) {
assert(!entry->values.empty());
if (!isValidSymbol(entry->name)) {
std::stringstream err;
err << "invalid symbol name '"
<< StringPiece16(entry->name)
<< "'";
mError = err.str();
return false;
}
entry->values.front().value->accept(*this, GenArgs{ out, *entry });
}
} else {
result = generateType(out, *type, packageId);
}
if (!result) {
return false;
}
out << " }" << std::endl;
}
out << "}" << std::endl;
return true;
}
} // namespace aapt
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