AAPT2: Adding basic binding support

This is incomplete. Still requires:

- filling in layout information in the resulting .bind.xml
- processing elements with <view class=""/>
- processing imports

Change-Id: Ie5d4c5e6435591bbed3248129a548736244894eb
diff --git a/tools/aapt2/BindingXmlPullParser.h b/tools/aapt2/BindingXmlPullParser.h
new file mode 100644
index 0000000..c892b09
--- /dev/null
+++ b/tools/aapt2/BindingXmlPullParser.h
@@ -0,0 +1,88 @@
+/*
+ * 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_BINDING_XML_PULL_PARSER_H
+#define AAPT_BINDING_XML_PULL_PARSER_H
+
+#include "XmlPullParser.h"
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+namespace aapt {
+
+class BindingXmlPullParser : public XmlPullParser {
+public:
+    BindingXmlPullParser(const std::shared_ptr<XmlPullParser>& parser);
+    BindingXmlPullParser(const BindingXmlPullParser& rhs) = delete;
+
+    Event getEvent() const override;
+    const std::string& getLastError() const override;
+    Event next() override;
+
+    const std::u16string& getComment() const override;
+    size_t getLineNumber() const override;
+    size_t getDepth() const override;
+
+    const std::u16string& getText() const override;
+
+    const std::u16string& getNamespacePrefix() const override;
+    const std::u16string& getNamespaceUri() const override;
+
+    const std::u16string& getElementNamespace() const override;
+    const std::u16string& getElementName() const override;
+
+    const_iterator beginAttributes() const override;
+    const_iterator endAttributes() const override;
+    size_t getAttributeCount() const override;
+
+    bool writeToFile(std::ostream& out) const;
+
+private:
+    struct VarDecl {
+        std::string name;
+        std::string type;
+    };
+
+    struct Import {
+        std::string name;
+        std::string type;
+    };
+
+    struct Target {
+        std::string className;
+        std::string id;
+        int32_t tagId;
+
+        std::vector<XmlPullParser::Attribute> expressions;
+    };
+
+    bool readVariableDeclaration();
+    bool readExpressions();
+
+    std::shared_ptr<XmlPullParser> mParser;
+    std::string mLastError;
+    bool mOverride;
+    std::vector<XmlPullParser::Attribute> mAttributes;
+    std::vector<VarDecl> mVarDecls;
+    std::vector<Target> mTargets;
+    int32_t mNextTagId;
+};
+
+} // namespace aapt
+
+#endif // AAPT_BINDING_XML_PULL_PARSER_H