AAPT2: Separate out the various steps

An early refactor. Some ideas became clearer as
development continued. Now the various phases are much
clearer and more easily reusable.

Also added a ton of tests!

Change-Id: Ic8f0a70c8222370352e63533b329c40457c0903e
diff --git a/tools/aapt2/test/Context.h b/tools/aapt2/test/Context.h
new file mode 100644
index 0000000..4fa4918
--- /dev/null
+++ b/tools/aapt2/test/Context.h
@@ -0,0 +1,156 @@
+/*
+ * 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_TEST_CONTEXT_H
+#define AAPT_TEST_CONTEXT_H
+
+#include "NameMangler.h"
+#include "util/Util.h"
+
+#include "process/IResourceTableConsumer.h"
+#include "process/SymbolTable.h"
+#include "test/Common.h"
+
+#include <cassert>
+#include <list>
+
+namespace aapt {
+namespace test {
+
+class Context : public IAaptContext {
+private:
+    friend class ContextBuilder;
+
+    Context() = default;
+
+    Maybe<std::u16string> mCompilationPackage;
+    Maybe<uint8_t> mPackageId;
+    std::unique_ptr<IDiagnostics> mDiagnostics = util::make_unique<StdErrDiagnostics>();
+    std::unique_ptr<ISymbolTable> mSymbols;
+    std::unique_ptr<NameMangler> mNameMangler;
+
+public:
+    ISymbolTable* getExternalSymbols() override {
+        assert(mSymbols && "test symbols not set");
+        return mSymbols.get();
+    }
+
+    void setSymbolTable(std::unique_ptr<ISymbolTable> symbols) {
+        mSymbols = std::move(symbols);
+    }
+
+    IDiagnostics* getDiagnostics() override {
+        assert(mDiagnostics && "test diagnostics not set");
+        return mDiagnostics.get();
+    }
+
+    StringPiece16 getCompilationPackage() override {
+        assert(mCompilationPackage && "package name not set");
+        return mCompilationPackage.value();
+    }
+
+    uint8_t getPackageId() override {
+        assert(mPackageId && "package ID not set");
+        return mPackageId.value();
+    }
+
+    NameMangler* getNameMangler() override {
+        assert(mNameMangler && "test name mangler not set");
+        return mNameMangler.get();
+    }
+};
+
+class ContextBuilder {
+private:
+    std::unique_ptr<Context> mContext = std::unique_ptr<Context>(new Context());
+
+public:
+    ContextBuilder& setCompilationPackage(const StringPiece16& package) {
+        mContext->mCompilationPackage = package.toString();
+        return *this;
+    }
+
+    ContextBuilder& setPackageId(uint8_t id) {
+        mContext->mPackageId = id;
+        return *this;
+    }
+
+    ContextBuilder& setSymbolTable(std::unique_ptr<ISymbolTable> symbols) {
+        mContext->mSymbols = std::move(symbols);
+        return *this;
+    }
+
+    ContextBuilder& setDiagnostics(std::unique_ptr<IDiagnostics> diag) {
+        mContext->mDiagnostics = std::move(diag);
+        return *this;
+    }
+
+    ContextBuilder& setNameManglerPolicy(NameManglerPolicy policy) {
+        mContext->mNameMangler = util::make_unique<NameMangler>(policy);
+        return *this;
+    }
+
+    std::unique_ptr<Context> build() {
+        return std::move(mContext);
+    }
+};
+
+class StaticSymbolTableBuilder {
+private:
+    struct SymbolTable : public ISymbolTable {
+        std::list<std::unique_ptr<Symbol>> mSymbols;
+        std::map<ResourceName, Symbol*> mNameMap;
+        std::map<ResourceId, Symbol*> mIdMap;
+
+        const Symbol* findByName(const ResourceName& name) override {
+            auto iter = mNameMap.find(name);
+            if (iter != mNameMap.end()) {
+                return iter->second;
+            }
+            return nullptr;
+        }
+
+        const Symbol* findById(ResourceId id) override {
+            auto iter = mIdMap.find(id);
+            if (iter != mIdMap.end()) {
+                return iter->second;
+            }
+            return nullptr;
+        }
+    };
+
+    std::unique_ptr<SymbolTable> mSymbolTable = util::make_unique<SymbolTable>();
+
+public:
+    StaticSymbolTableBuilder& addSymbol(const StringPiece16& name, ResourceId id,
+                                  std::unique_ptr<Attribute> attr = {}) {
+        std::unique_ptr<ISymbolTable::Symbol> symbol = util::make_unique<ISymbolTable::Symbol>(
+                id, std::move(attr));
+        mSymbolTable->mNameMap[parseNameOrDie(name)] = symbol.get();
+        mSymbolTable->mIdMap[id] = symbol.get();
+        mSymbolTable->mSymbols.push_back(std::move(symbol));
+        return *this;
+    }
+
+    std::unique_ptr<ISymbolTable> build() {
+        return std::move(mSymbolTable);
+    }
+};
+
+} // namespace test
+} // namespace aapt
+
+#endif /* AAPT_TEST_CONTEXT_H */