1 files changed, 189 insertions, 0 deletions
diff --git a/tools/aapt2/JavaClassGenerator.cpp b/tools/aapt2/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 "JavaClassGenerator.h"
+#include "Resource.h"
+#include "ResourceTable.h"
+#include "ResourceValues.h"
+#include "StringPiece.h"
+
+#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)) {
+            mError = (std::stringstream()
+                    << "invalid symbol name '"
+                    << StringPiece16(entry->name)
+                    << "'").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)) {
+                    mError = (std::stringstream()
+                            << "invalid symbol name '"
+                            << StringPiece16(entry->name)
+                            << "'").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