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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.
*/
#ifndef AAPT_XML_PULL_PARSER_H
#define AAPT_XML_PULL_PARSER_H
#include <algorithm>
#include <ostream>
#include <string>
#include <vector>
#include "StringPiece.h"
namespace aapt {
class XmlPullParser {
public:
enum class Event {
kBadDocument,
kStartDocument,
kEndDocument,
kStartNamespace,
kEndNamespace,
kStartElement,
kEndElement,
kText,
kComment,
};
static void skipCurrentElement(XmlPullParser* parser);
static bool isGoodEvent(Event event);
virtual ~XmlPullParser() {}
/**
* Returns the current event that is being processed.
*/
virtual Event getEvent() const = 0;
virtual const std::string& getLastError() const = 0;
/**
* Note, unlike XmlPullParser, the first call to next() will return
* StartElement of the first element.
*/
virtual Event next() = 0;
//
// These are available for all nodes.
//
virtual const std::u16string& getComment() const = 0;
virtual size_t getLineNumber() const = 0;
virtual size_t getDepth() const = 0;
/**
* Returns the character data for a Text event.
*/
virtual const std::u16string& getText() const = 0;
//
// Namespace prefix and URI are available for StartNamespace and EndNamespace.
//
virtual const std::u16string& getNamespacePrefix() const = 0;
virtual const std::u16string& getNamespaceUri() const = 0;
/*
* Uses the current stack of namespaces to resolve the package. Eg:
* xmlns:app = "http://schemas.android.com/apk/res/com.android.app"
* ...
* android:text="@app:string/message"
*
* In this case, 'app' will be converted to 'com.android.app'.
*
* If xmlns:app="http://schemas.android.com/apk/res-auto", then
* 'package' will be set to 'defaultPackage'.
*/
virtual bool applyPackageAlias(std::u16string* package,
const std::u16string& defaultPackage) const = 0;
//
// These are available for StartElement and EndElement.
//
virtual const std::u16string& getElementNamespace() const = 0;
virtual const std::u16string& getElementName() const = 0;
//
// Remaining methods are for retrieving information about attributes
// associated with a StartElement.
//
// Attributes must be in sorted order (according to the less than operator
// of struct Attribute).
//
struct Attribute {
std::u16string namespaceUri;
std::u16string name;
std::u16string value;
int compare(const Attribute& rhs) const;
bool operator<(const Attribute& rhs) const;
bool operator==(const Attribute& rhs) const;
bool operator!=(const Attribute& rhs) const;
};
using const_iterator = std::vector<Attribute>::const_iterator;
virtual const_iterator beginAttributes() const = 0;
virtual const_iterator endAttributes() const = 0;
virtual size_t getAttributeCount() const = 0;
const_iterator findAttribute(StringPiece16 namespaceUri, StringPiece16 name) const;
};
//
// Implementation
//
inline ::std::ostream& operator<<(::std::ostream& out, XmlPullParser::Event event) {
switch (event) {
case XmlPullParser::Event::kBadDocument: return out << "BadDocument";
case XmlPullParser::Event::kStartDocument: return out << "StartDocument";
case XmlPullParser::Event::kEndDocument: return out << "EndDocument";
case XmlPullParser::Event::kStartNamespace: return out << "StartNamespace";
case XmlPullParser::Event::kEndNamespace: return out << "EndNamespace";
case XmlPullParser::Event::kStartElement: return out << "StartElement";
case XmlPullParser::Event::kEndElement: return out << "EndElement";
case XmlPullParser::Event::kText: return out << "Text";
case XmlPullParser::Event::kComment: return out << "Comment";
}
return out;
}
inline void XmlPullParser::skipCurrentElement(XmlPullParser* parser) {
int depth = 1;
while (depth > 0) {
switch (parser->next()) {
case Event::kEndDocument:
case Event::kBadDocument:
return;
case Event::kStartElement:
depth++;
break;
case Event::kEndElement:
depth--;
break;
default:
break;
}
}
}
inline bool XmlPullParser::isGoodEvent(XmlPullParser::Event event) {
return event != Event::kBadDocument && event != Event::kEndDocument;
}
inline int XmlPullParser::Attribute::compare(const Attribute& rhs) const {
int cmp = namespaceUri.compare(rhs.namespaceUri);
if (cmp != 0) return cmp;
return name.compare(rhs.name);
}
inline bool XmlPullParser::Attribute::operator<(const Attribute& rhs) const {
return compare(rhs) < 0;
}
inline bool XmlPullParser::Attribute::operator==(const Attribute& rhs) const {
return compare(rhs) == 0;
}
inline bool XmlPullParser::Attribute::operator!=(const Attribute& rhs) const {
return compare(rhs) != 0;
}
inline XmlPullParser::const_iterator XmlPullParser::findAttribute(StringPiece16 namespaceUri,
StringPiece16 name) const {
const auto endIter = endAttributes();
const auto iter = std::lower_bound(beginAttributes(), endIter,
std::pair<StringPiece16, StringPiece16>(namespaceUri, name),
[](const Attribute& attr, const std::pair<StringPiece16, StringPiece16>& rhs) -> bool {
int cmp = attr.namespaceUri.compare(0, attr.namespaceUri.size(),
rhs.first.data(), rhs.first.size());
if (cmp < 0) return true;
if (cmp > 0) return false;
cmp = attr.name.compare(0, attr.name.size(), rhs.second.data(), rhs.second.size());
if (cmp < 0) return true;
return false;
}
);
if (iter != endIter && namespaceUri == iter->namespaceUri && name == iter->name) {
return iter;
}
return endIter;
}
} // namespace aapt
#endif // AAPT_XML_PULL_PARSER_H
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