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android_frameworks_base/tools/aapt2/java/JavaClassGenerator.cpp

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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 "java/JavaClassGenerator.h"
#include <algorithm>
#include <ostream>
#include <set>
#include <sstream>
#include <tuple>
#include "android-base/errors.h"
#include "android-base/logging.h"
#include "android-base/stringprintf.h"
#include "androidfw/StringPiece.h"
#include "NameMangler.h"
#include "Resource.h"
#include "ResourceTable.h"
#include "ResourceValues.h"
#include "SdkConstants.h"
#include "ValueVisitor.h"
#include "java/AnnotationProcessor.h"
#include "java/ClassDefinition.h"
#include "process/SymbolTable.h"
using ::aapt::io::OutputStream;
using ::aapt::text::Printer;
using ::android::StringPiece;
using ::android::base::StringPrintf;
namespace aapt {
static const std::set<StringPiece> sJavaIdentifiers = {
"abstract", "assert", "boolean", "break", "byte",
"case", "catch", "char", "class", "const",
"continue", "default", "do", "double", "else",
"enum", "extends", "final", "finally", "float",
"for", "goto", "if", "implements", "import",
"instanceof", "int", "interface", "long", "native",
"new", "package", "private", "protected", "public",
"return", "short", "static", "strictfp", "super",
"switch", "synchronized", "this", "throw", "throws",
"transient", "try", "void", "volatile", "while",
"true", "false", "null"};
static bool IsValidSymbol(const StringPiece& symbol) {
return sJavaIdentifiers.find(symbol) == sJavaIdentifiers.end();
}
// Java symbols can not contain . or -, but those are valid in a resource name.
// Replace those with '_'.
std::string JavaClassGenerator::TransformToFieldName(const StringPiece& symbol) {
std::string output = symbol.to_string();
for (char& c : output) {
if (c == '.' || c == '-') {
c = '_';
}
}
return output;
}
// Transforms an attribute in a styleable to the Java field name:
//
// <declare-styleable name="Foo">
// <attr name="android:bar" />
// <attr name="bar" />
// </declare-styleable>
//
// Foo_android_bar
// Foo_bar
static std::string TransformNestedAttr(const ResourceNameRef& attr_name,
const std::string& styleable_class_name,
const StringPiece& package_name_to_generate) {
std::string output = styleable_class_name;
// We may reference IDs from other packages, so prefix the entry name with
// the package.
if (!attr_name.package.empty() &&
package_name_to_generate != attr_name.package) {
output += "_" + JavaClassGenerator::TransformToFieldName(attr_name.package);
}
output += "_" + JavaClassGenerator::TransformToFieldName(attr_name.entry);
return output;
}
static void AddAttributeFormatDoc(AnnotationProcessor* processor, Attribute* attr) {
const uint32_t type_mask = attr->type_mask;
if (type_mask & android::ResTable_map::TYPE_REFERENCE) {
processor->AppendComment(
"<p>May be a reference to another resource, in the form\n"
"\"<code>@[+][<i>package</i>:]<i>type</i>/<i>name</i></code>\" or a "
"theme\n"
"attribute in the form\n"
"\"<code>?[<i>package</i>:]<i>type</i>/<i>name</i></code>\".");
}
if (type_mask & android::ResTable_map::TYPE_STRING) {
processor->AppendComment(
"<p>May be a string value, using '\\\\;' to escape characters such as\n"
"'\\\\n' or '\\\\uxxxx' for a unicode character;");
}
if (type_mask & android::ResTable_map::TYPE_INTEGER) {
processor->AppendComment(
"<p>May be an integer value, such as \"<code>100</code>\".");
}
if (type_mask & android::ResTable_map::TYPE_BOOLEAN) {
processor->AppendComment(
"<p>May be a boolean value, such as \"<code>true</code>\" or\n"
"\"<code>false</code>\".");
}
if (type_mask & android::ResTable_map::TYPE_COLOR) {
processor->AppendComment(
"<p>May be a color value, in the form of "
"\"<code>#<i>rgb</i></code>\",\n"
"\"<code>#<i>argb</i></code>\", \"<code>#<i>rrggbb</i></code>\", or \n"
"\"<code>#<i>aarrggbb</i></code>\".");
}
if (type_mask & android::ResTable_map::TYPE_FLOAT) {
processor->AppendComment(
"<p>May be a floating point value, such as \"<code>1.2</code>\".");
}
if (type_mask & android::ResTable_map::TYPE_DIMENSION) {
processor->AppendComment(
"<p>May be a dimension value, which is a floating point number "
"appended with a\n"
"unit such as \"<code>14.5sp</code>\".\n"
"Available units are: px (pixels), dp (density-independent pixels),\n"
"sp (scaled pixels based on preferred font size), in (inches), and\n"
"mm (millimeters).");
}
if (type_mask & android::ResTable_map::TYPE_FRACTION) {
processor->AppendComment(
"<p>May be a fractional value, which is a floating point number "
"appended with\n"
"either % or %p, such as \"<code>14.5%</code>\".\n"
"The % suffix always means a percentage of the base size;\n"
"the optional %p suffix provides a size relative to some parent "
"container.");
}
if (type_mask &
(android::ResTable_map::TYPE_FLAGS | android::ResTable_map::TYPE_ENUM)) {
if (type_mask & android::ResTable_map::TYPE_FLAGS) {
processor->AppendComment(
"<p>Must be one or more (separated by '|') of the following "
"constant values.</p>");
} else {
processor->AppendComment(
"<p>Must be one of the following constant values.</p>");
}
processor->AppendComment(
"<table>\n<colgroup align=\"left\" />\n"
"<colgroup align=\"left\" />\n"
"<colgroup align=\"left\" />\n"
"<tr><th>Constant</th><th>Value</th><th>Description</th></tr>\n");
for (const Attribute::Symbol& symbol : attr->symbols) {
std::stringstream line;
line << "<tr><td>" << symbol.symbol.name.value().entry << "</td>"
<< "<td>" << std::hex << symbol.value << std::dec << "</td>"
<< "<td>" << util::TrimWhitespace(symbol.symbol.GetComment())
<< "</td></tr>";
processor->AppendComment(line.str());
}
processor->AppendComment("</table>");
}
}
JavaClassGenerator::JavaClassGenerator(IAaptContext* context,
ResourceTable* table,
const JavaClassGeneratorOptions& options)
: context_(context), table_(table), options_(options) {}
bool JavaClassGenerator::SkipSymbol(Visibility::Level level) {
switch (options_.types) {
case JavaClassGeneratorOptions::SymbolTypes::kAll:
return false;
case JavaClassGeneratorOptions::SymbolTypes::kPublicPrivate:
return level == Visibility::Level::kUndefined;
case JavaClassGeneratorOptions::SymbolTypes::kPublic:
return level != Visibility::Level::kPublic;
}
return true;
}
// Whether or not to skip writing this symbol.
bool JavaClassGenerator::SkipSymbol(const Maybe<SymbolTable::Symbol>& symbol) {
return !symbol || (options_.types == JavaClassGeneratorOptions::SymbolTypes::kPublic &&
!symbol.value().is_public);
}
struct StyleableAttr {
const Reference* attr_ref = nullptr;
std::string field_name;
Maybe<SymbolTable::Symbol> symbol;
};
static bool operator<(const StyleableAttr& lhs, const StyleableAttr& rhs) {
const ResourceId lhs_id = lhs.attr_ref->id.value_or_default(ResourceId(0));
const ResourceId rhs_id = rhs.attr_ref->id.value_or_default(ResourceId(0));
if (lhs_id == rhs_id) {
return lhs.attr_ref->name.value() < rhs.attr_ref->name.value();
}
return cmp_ids_dynamic_after_framework(lhs_id, rhs_id);
}
void JavaClassGenerator::ProcessStyleable(const ResourceNameRef& name, const ResourceId& id,
const Styleable& styleable,
const StringPiece& package_name_to_generate,
ClassDefinition* out_class_def,
MethodDefinition* out_rewrite_method,
Printer* r_txt_printer) {
const std::string array_field_name = TransformToFieldName(name.entry);
std::unique_ptr<ResourceArrayMember> array_def =
util::make_unique<ResourceArrayMember>(array_field_name);
// The array must be sorted by resource ID.
std::vector<StyleableAttr> sorted_attributes;
sorted_attributes.reserve(styleable.entries.size());
for (const auto& attr : styleable.entries) {
// If we are not encoding final attributes, the styleable entry may have no
// ID if we are building a static library.
CHECK(!options_.use_final || attr.id) << "no ID set for Styleable entry";
CHECK(bool(attr.name)) << "no name set for Styleable entry";
// We will need the unmangled, transformed name in the comments and the field,
// so create it once and cache it in this StyleableAttr data structure.
StyleableAttr styleable_attr;
styleable_attr.attr_ref = &attr;
// The field name for this attribute is prefixed by the name of this styleable and
// the package it comes from.
styleable_attr.field_name =
TransformNestedAttr(attr.name.value(), array_field_name, package_name_to_generate);
Reference ref = attr;
if (attr.name.value().package.empty()) {
// If the resource does not have a package name, set the package to the unmangled package name
// of the styleable declaration because attributes without package names would have been
// declared in the same package as the styleable.
ref.name = ResourceName(package_name_to_generate, ref.name.value().type,
ref.name.value().entry);
}
// Look up the symbol so that we can write out in the comments what are possible legal values
// for this attribute.
const SymbolTable::Symbol* symbol = context_->GetExternalSymbols()->FindByReference(ref);
if (symbol && symbol->attribute) {
// Copy the symbol data structure because the returned instance can be destroyed.
styleable_attr.symbol = *symbol;
}
sorted_attributes.push_back(std::move(styleable_attr));
}
// Sort the attributes by ID.
std::sort(sorted_attributes.begin(), sorted_attributes.end());
// Build the JavaDoc comment for the Styleable array. This has references to child attributes
// and what possible values can be used for them.
const size_t attr_count = sorted_attributes.size();
if (out_class_def != nullptr && attr_count > 0) {
std::stringstream styleable_comment;
if (!styleable.GetComment().empty()) {
styleable_comment << styleable.GetComment() << "\n";
} else {
// Apply a default intro comment if the styleable has no comments of its own.
styleable_comment << "Attributes that can be used with a " << array_field_name << ".\n";
}
styleable_comment << "<p>Includes the following attributes:</p>\n"
"<table>\n"
"<colgroup align=\"left\" />\n"
"<colgroup align=\"left\" />\n"
"<tr><th>Attribute</th><th>Description</th></tr>\n";
// Removed and hidden attributes are public but hidden from the documentation, so don't emit
// them as part of the class documentation.
std::vector<StyleableAttr> documentation_attrs = sorted_attributes;
auto documentation_remove_iter = std::remove_if(documentation_attrs.begin(),
documentation_attrs.end(),
[&](StyleableAttr entry) -> bool {
if (SkipSymbol(entry.symbol)) {
return true;
}
const StringPiece attr_comment_line = entry.symbol.value().attribute->GetComment();
return attr_comment_line.contains("@removed") || attr_comment_line.contains("@hide");
});
documentation_attrs.erase(documentation_remove_iter, documentation_attrs.end());
// Build the table of attributes with their links and names.
for (const StyleableAttr& entry : documentation_attrs) {
const ResourceName& attr_name = entry.attr_ref->name.value();
styleable_comment << "<tr><td><code>{@link #" << entry.field_name << " "
<< (!attr_name.package.empty() ? attr_name.package
: package_name_to_generate)
<< ":" << attr_name.entry << "}</code></td>";
// Only use the comment up until the first '.'. This is to stay compatible with
// the way old AAPT did it (presumably to keep it short and to avoid including
// annotations like @hide which would affect this Styleable).
StringPiece attr_comment_line = entry.symbol.value().attribute->GetComment();
styleable_comment << "<td>" << AnnotationProcessor::ExtractFirstSentence(attr_comment_line)
<< "</td></tr>\n";
}
styleable_comment << "</table>\n";
// Generate the @see lines for each attribute.
for (const StyleableAttr& entry : documentation_attrs) {
styleable_comment << "@see #" << entry.field_name << "\n";
}
array_def->GetCommentBuilder()->AppendComment(styleable_comment.str());
}
if (r_txt_printer != nullptr) {
r_txt_printer->Print("int[] styleable ").Print(array_field_name).Print(" {");
}
// Add the ResourceIds to the array member.
for (size_t i = 0; i < attr_count; i++) {
const ResourceId id = sorted_attributes[i].attr_ref->id.value_or_default(ResourceId(0));
array_def->AddElement(id);
if (r_txt_printer != nullptr) {
if (i != 0) {
r_txt_printer->Print(",");
}
r_txt_printer->Print(" ").Print(id.to_string());
}
}
if (r_txt_printer != nullptr) {
r_txt_printer->Println(" }");
}
// Add the Styleable array to the Styleable class.
if (out_class_def != nullptr) {
out_class_def->AddMember(std::move(array_def));
}
// Now we emit the indices into the array.
for (size_t i = 0; i < attr_count; i++) {
const StyleableAttr& styleable_attr = sorted_attributes[i];
if (SkipSymbol(styleable_attr.symbol)) {
continue;
}
if (out_class_def != nullptr) {
StringPiece comment = styleable_attr.attr_ref->GetComment();
if (styleable_attr.symbol.value().attribute && comment.empty()) {
comment = styleable_attr.symbol.value().attribute->GetComment();
}
if (comment.contains("@removed")) {
// Removed attributes are public but hidden from the documentation, so
// don't emit them as part of the class documentation.
continue;
}
const ResourceName& attr_name = styleable_attr.attr_ref->name.value();
StringPiece package_name = attr_name.package;
if (package_name.empty()) {
package_name = package_name_to_generate;
}
std::unique_ptr<IntMember> index_member =
util::make_unique<IntMember>(sorted_attributes[i].field_name, static_cast<uint32_t>(i));
AnnotationProcessor* attr_processor = index_member->GetCommentBuilder();
if (!comment.empty()) {
attr_processor->AppendComment("<p>\n@attr description");
attr_processor->AppendComment(comment);
} else {
std::stringstream default_comment;
default_comment << "<p>This symbol is the offset where the "
<< "{@link " << package_name << ".R.attr#"
<< TransformToFieldName(attr_name.entry) << "}\n"
<< "attribute's value can be found in the "
<< "{@link #" << array_field_name << "} array.";
attr_processor->AppendComment(default_comment.str());
}
attr_processor->AppendNewLine();
AddAttributeFormatDoc(attr_processor, styleable_attr.symbol.value().attribute.get());
attr_processor->AppendNewLine();
attr_processor->AppendComment(
StringPrintf("@attr name %s:%s", package_name.data(), attr_name.entry.data()));
out_class_def->AddMember(std::move(index_member));
}
if (r_txt_printer != nullptr) {
r_txt_printer->Println(
StringPrintf("int styleable %s %zd", sorted_attributes[i].field_name.c_str(), i));
}
}
// If there is a rewrite method to generate, add the statements that rewrite package IDs
// for this styleable.
if (out_rewrite_method != nullptr) {
out_rewrite_method->AppendStatement(
StringPrintf("for (int i = 0; i < styleable.%s.length; i++) {", array_field_name.data()));
out_rewrite_method->AppendStatement(
StringPrintf(" if ((styleable.%s[i] & 0xff000000) == 0) {", array_field_name.data()));
out_rewrite_method->AppendStatement(
StringPrintf(" styleable.%s[i] = (styleable.%s[i] & 0x00ffffff) | packageIdBits;",
array_field_name.data(), array_field_name.data()));
out_rewrite_method->AppendStatement(" }");
out_rewrite_method->AppendStatement("}");
}
}
void JavaClassGenerator::ProcessResource(const ResourceNameRef& name, const ResourceId& id,
const ResourceEntry& entry, ClassDefinition* out_class_def,
MethodDefinition* out_rewrite_method,
text::Printer* r_txt_printer) {
ResourceId real_id = id;
if (context_->GetMinSdkVersion() < SDK_O && name.type == ResourceType::kId &&
id.package_id() > kAppPackageId) {
// Workaround for feature splits using package IDs > 0x7F.
// See b/37498913.
real_id = ResourceId(kAppPackageId, id.package_id(), id.entry_id());
}
const std::string field_name = TransformToFieldName(name.entry);
if (out_class_def != nullptr) {
std::unique_ptr<ResourceMember> resource_member =
util::make_unique<ResourceMember>(field_name, real_id);
// Build the comments and annotations for this entry.
AnnotationProcessor* processor = resource_member->GetCommentBuilder();
// Add the comments from any <public> tags.
if (entry.visibility.level != Visibility::Level::kUndefined) {
processor->AppendComment(entry.visibility.comment);
}
// Add the comments from all configurations of this entry.
for (const auto& config_value : entry.values) {
processor->AppendComment(config_value->value->GetComment());
}
// If this is an Attribute, append the format Javadoc.
if (!entry.values.empty()) {
if (Attribute* attr = ValueCast<Attribute>(entry.values.front()->value.get())) {
// We list out the available values for the given attribute.
AddAttributeFormatDoc(processor, attr);
}
}
out_class_def->AddMember(std::move(resource_member));
}
if (r_txt_printer != nullptr) {
r_txt_printer->Print("int ")
.Print(to_string(name.type))
.Print(" ")
.Print(field_name)
.Print(" ")
.Println(real_id.to_string());
}
if (out_rewrite_method != nullptr) {
const StringPiece& type_str = to_string(name.type);
out_rewrite_method->AppendStatement(
StringPrintf("%s.%s = (%s.%s & 0x00ffffff) | packageIdBits;", type_str.data(),
field_name.data(), type_str.data(), field_name.data()));
}
}
Maybe<std::string> JavaClassGenerator::UnmangleResource(const StringPiece& package_name,
const StringPiece& package_name_to_generate,
const ResourceEntry& entry) {
if (SkipSymbol(entry.visibility.level)) {
return {};
}
std::string unmangled_package;
std::string unmangled_name = entry.name;
if (NameMangler::Unmangle(&unmangled_name, &unmangled_package)) {
// The entry name was mangled, and we successfully unmangled it.
// Check that we want to emit this symbol.
if (package_name_to_generate != unmangled_package) {
// Skip the entry if it doesn't belong to the package we're writing.
return {};
}
} else if (package_name_to_generate != package_name) {
// We are processing a mangled package name,
// but this is a non-mangled resource.
return {};
}
return {std::move(unmangled_name)};
}
bool JavaClassGenerator::ProcessType(const StringPiece& package_name_to_generate,
const ResourceTablePackage& package,
const ResourceTableType& type,
ClassDefinition* out_type_class_def,
MethodDefinition* out_rewrite_method_def,
Printer* r_txt_printer) {
for (const auto& entry : type.entries) {
const Maybe<std::string> unmangled_name =
UnmangleResource(package.name, package_name_to_generate, *entry);
if (!unmangled_name) {
continue;
}
// Create an ID if there is one (static libraries don't need one).
ResourceId id;
if (package.id && type.id && entry->id) {
id = ResourceId(package.id.value(), type.id.value(), entry->id.value());
}
// We need to make sure we hide the fact that we are generating kAttrPrivate attributes.
const ResourceNameRef resource_name(
package_name_to_generate,
type.type == ResourceType::kAttrPrivate ? ResourceType::kAttr : type.type,
unmangled_name.value());
// Check to see if the unmangled name is a valid Java name (not a keyword).
if (!IsValidSymbol(unmangled_name.value())) {
std::stringstream err;
err << "invalid symbol name '" << resource_name << "'";
error_ = err.str();
return false;
}
if (resource_name.type == ResourceType::kStyleable) {
CHECK(!entry->values.empty());
const Styleable* styleable =
static_cast<const Styleable*>(entry->values.front()->value.get());
ProcessStyleable(resource_name, id, *styleable, package_name_to_generate, out_type_class_def,
out_rewrite_method_def, r_txt_printer);
} else {
ProcessResource(resource_name, id, *entry, out_type_class_def, out_rewrite_method_def,
r_txt_printer);
}
}
return true;
}
bool JavaClassGenerator::Generate(const StringPiece& package_name_to_generate, OutputStream* out,
OutputStream* out_r_txt) {
return Generate(package_name_to_generate, package_name_to_generate, out, out_r_txt);
}
static void AppendJavaDocAnnotations(const std::vector<std::string>& annotations,
AnnotationProcessor* processor) {
for (const std::string& annotation : annotations) {
std::string proper_annotation = "@";
proper_annotation += annotation;
processor->AppendComment(proper_annotation);
}
}
bool JavaClassGenerator::Generate(const StringPiece& package_name_to_generate,
const StringPiece& out_package_name, OutputStream* out,
OutputStream* out_r_txt) {
ClassDefinition r_class("R", ClassQualifier::kNone, true);
std::unique_ptr<MethodDefinition> rewrite_method;
std::unique_ptr<Printer> r_txt_printer;
if (out_r_txt != nullptr) {
r_txt_printer = util::make_unique<Printer>(out_r_txt);
}
// Generate an onResourcesLoaded() callback if requested.
if (out != nullptr && options_.rewrite_callback_options) {
rewrite_method =
util::make_unique<MethodDefinition>("public static void onResourcesLoaded(int p)");
for (const std::string& package_to_callback :
options_.rewrite_callback_options.value().packages_to_callback) {
rewrite_method->AppendStatement(
StringPrintf("%s.R.onResourcesLoaded(p);", package_to_callback.data()));
}
rewrite_method->AppendStatement("final int packageIdBits = p << 24;");
}
const bool is_public = (options_.types == JavaClassGeneratorOptions::SymbolTypes::kPublic);
for (const auto& package : table_->packages) {
for (const auto& type : package->types) {
if (type->type == ResourceType::kAttrPrivate) {
// We generate these as part of the kAttr type, so skip them here.
continue;
}
// Stay consistent with AAPT and generate an empty type class if the R class is public.
const bool force_creation_if_empty = is_public;
std::unique_ptr<ClassDefinition> class_def;
if (out != nullptr) {
class_def = util::make_unique<ClassDefinition>(
to_string(type->type), ClassQualifier::kStatic, force_creation_if_empty);
}
if (!ProcessType(package_name_to_generate, *package, *type, class_def.get(),
rewrite_method.get(), r_txt_printer.get())) {
return false;
}
if (type->type == ResourceType::kAttr) {
// Also include private attributes in this same class.
const ResourceTableType* priv_type = package->FindType(ResourceType::kAttrPrivate);
if (priv_type) {
if (!ProcessType(package_name_to_generate, *package, *priv_type, class_def.get(),
rewrite_method.get(), r_txt_printer.get())) {
return false;
}
}
}
if (out != nullptr && type->type == ResourceType::kStyleable && is_public) {
// When generating a public R class, we don't want Styleable to be part
// of the API. It is only emitted for documentation purposes.
class_def->GetCommentBuilder()->AppendComment("@doconly");
}
if (out != nullptr) {
AppendJavaDocAnnotations(options_.javadoc_annotations, class_def->GetCommentBuilder());
r_class.AddMember(std::move(class_def));
}
}
}
if (rewrite_method != nullptr) {
r_class.AddMember(std::move(rewrite_method));
}
if (out != nullptr) {
AppendJavaDocAnnotations(options_.javadoc_annotations, r_class.GetCommentBuilder());
ClassDefinition::WriteJavaFile(&r_class, out_package_name, options_.use_final, !is_public, out);
}
return true;
}
} // namespace aapt
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