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/*************************************************************************
** XMLNode.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2023 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#ifndef XMLNODE_HPP
#define XMLNODE_HPP
#include <deque>
#include <map>
#include <memory>
#include <ostream>
#include <string>
#include <vector>
#include "utility.hpp"
class XMLCData;
class XMLComment;
class XMLElement;
class XMLText;
class XMLNode {
friend class XMLElement;
template <typename T>
T* cast (const T* (XMLNode::*func)() const) {
return const_cast<T*>((const_cast<const XMLNode*>(this)->*func)());
}
public:
XMLNode () =default;
XMLNode (const XMLNode &node) : _next(nullptr) {}
XMLNode (XMLNode &&node) noexcept : _parent(node._parent), _prev(node._prev), _next(std::move(node._next)) {}
virtual ~XMLNode () =default;
virtual std::unique_ptr<XMLNode> clone () const =0;
virtual void clear () =0;
virtual std::ostream& write (std::ostream &os) const =0;
virtual const XMLElement* toElement () const {return nullptr;}
virtual const XMLText* toText () const {return nullptr;}
virtual const XMLText* toWSNode () const {return nullptr;}
virtual const XMLComment* toComment () const {return nullptr;}
virtual const XMLCData* toCData () const {return nullptr;}
XMLElement* toElement () {return cast<XMLElement>(&XMLNode::toElement);}
XMLText* toText () {return cast<XMLText>(&XMLNode::toText);}
XMLComment* toComment () {return cast<XMLComment>(&XMLNode::toComment);}
XMLCData* toCData () {return cast<XMLCData>(&XMLNode::toCData);}
XMLNode* parent () const {return _parent;}
XMLNode* prev () const {return _prev;}
XMLNode* next () const {return _next.get();}
XMLElement* nextElement () const;
static bool KEEP_ENCODED_FILES;
protected:
XMLNode* insertNext (std::unique_ptr<XMLNode> node);
std::unique_ptr<XMLNode> removeNext ();
void parent (XMLNode *p) {_parent = p;}
void prev (XMLNode *p) {_prev = p;}
private:
XMLNode *_parent=nullptr; ///< pointer to parent node
XMLNode *_prev=nullptr; ///< pointer to preceding sibling
std::unique_ptr<XMLNode> _next; ///< pointer to next sibling (incl. ownership)
};
class XMLNodeIterator {
public:
XMLNodeIterator () =default;
explicit XMLNodeIterator (XMLNode *curr) : _curr(curr) {}
XMLNodeIterator& operator ++ () {_curr = _curr->next(); return *this;}
XMLNodeIterator& operator -- () {_curr = _curr->prev(); return *this;}
XMLNodeIterator operator ++ (int) {auto p=_curr; _curr = _curr->next(); return XMLNodeIterator(p);}
XMLNodeIterator operator -- (int) {auto p=_curr; _curr = _curr->prev(); return XMLNodeIterator(p);}
XMLNode* operator * () {return _curr;}
XMLNode& operator -> () {return *_curr;}
bool operator == (const XMLNodeIterator &it) const {return _curr == it._curr;}
bool operator != (const XMLNodeIterator &it) const {return _curr != it._curr;}
private:
XMLNode *_curr=nullptr;
};
class ConstXMLNodeIterator {
public:
ConstXMLNodeIterator () =default;
explicit ConstXMLNodeIterator (const XMLNode *curr) : _curr(curr) {}
ConstXMLNodeIterator& operator ++ () {_curr = _curr->next(); return *this;}
ConstXMLNodeIterator& operator -- () {_curr = _curr->prev(); return *this;}
ConstXMLNodeIterator operator ++ (int) {auto p=_curr; _curr = _curr->next(); return ConstXMLNodeIterator(p);}
ConstXMLNodeIterator operator -- (int) {auto p=_curr; _curr = _curr->prev(); return ConstXMLNodeIterator(p);}
const XMLNode* operator * () {return _curr;}
const XMLNode& operator -> () {return *_curr;}
bool operator == (const ConstXMLNodeIterator &it) const {return _curr == it._curr;}
bool operator != (const ConstXMLNodeIterator &it) const {return _curr != it._curr;}
private:
const XMLNode *_curr=nullptr;
};
class XMLElement : public XMLNode {
public:
struct Attribute {
Attribute (std::string nam, std::string val) : name(std::move(nam)), value(std::move(val)) {}
bool inheritable () const;
std::string name;
std::string value;
};
using Attributes = std::vector<Attribute>;
static bool WRITE_NEWLINES; ///< insert line breaks after element tags?
public:
explicit XMLElement (std::string name);
XMLElement (const XMLElement &node);
XMLElement (XMLElement &&node) noexcept;
~XMLElement () override;
std::unique_ptr<XMLNode> clone () const override {return util::make_unique<XMLElement>(*this);}
void clear () override;
void addAttribute (const std::string &name, const std::string &value);
void addAttribute (const std::string &name, double value);
void removeAttribute (const std::string &name);
XMLNode* append (std::unique_ptr<XMLNode> child);
XMLNode* append (const std::string &str);
XMLNode* prepend (std::unique_ptr<XMLNode> child);
XMLNode* insertAfter (std::unique_ptr<XMLNode> child, XMLNode *sibling);
XMLNode* insertBefore (std::unique_ptr<XMLNode> child, XMLNode *sibling);
bool hasAttribute (const std::string &name) const;
const char* getAttributeValue (const std::string &name) const;
bool getDescendants (const char *name, const char *attrName, std::vector<XMLElement*> &descendants) const;
XMLElement* getFirstDescendant (const char *name, const char *attrName, const char *attrValue) const;
XMLNode* firstChild () const {return _firstChild.get();}
XMLNode* lastChild () const {return _lastChild;}
std::ostream& write (std::ostream &os) const override;
bool empty (bool ignoreWhitespace=false) const;
Attributes& attributes () {return _attributes;}
const Attributes& attributes () const {return _attributes;}
XMLNodeIterator begin () {return XMLNodeIterator(_firstChild.get());}
XMLNodeIterator end () {return XMLNodeIterator(nullptr);}
ConstXMLNodeIterator begin () const {return ConstXMLNodeIterator(_firstChild.get());}
ConstXMLNodeIterator end () const {return ConstXMLNodeIterator(nullptr);}
const std::string& name () const {return _name;}
const XMLElement* toElement () const override {return this;}
const Attribute* getAttribute (const std::string &name) const;
static std::unique_ptr<XMLNode> detach (XMLNode *node);
static XMLElement* wrap (XMLNode *first, XMLNode *last, const std::string &name);
static XMLNode* unwrap (XMLElement *child);
protected:
Attribute* getAttribute (const std::string &name);
XMLNode* insertFirst (std::unique_ptr<XMLNode> child);
XMLNode* insertLast (std::unique_ptr<XMLNode> child);
private:
std::string _name; // element name (<name a1="v1" .. an="vn">...</name>)
std::vector<Attribute> _attributes;
std::unique_ptr<XMLNode> _firstChild; ///< pointer to first child node (incl. ownership)
XMLNode *_lastChild=nullptr; ///< pointer to last child node
};
class XMLText : public XMLNode {
public:
explicit XMLText (std::string str) : _text(std::move(str)) {}
std::unique_ptr<XMLNode> clone () const override {return util::make_unique<XMLText>(*this);}
void clear () override {_text.clear();}
void append (std::unique_ptr<XMLNode> node);
void append (std::unique_ptr<XMLText> node);
void append (const std::string &str);
void prepend (std::unique_ptr<XMLNode> node);
std::ostream& write (std::ostream &os) const override {return os << _text;}
const std::string& getText () const {return _text;}
const XMLText* toText () const override {return this;}
const XMLText* toWSNode () const override;
private:
std::string _text;
};
class XMLComment : public XMLNode {
public:
explicit XMLComment (std::string str) : _text(std::move(str)) {}
std::unique_ptr<XMLNode> clone () const override {return util::make_unique<XMLComment>(*this);}
void clear () override {_text.clear();}
std::ostream& write (std::ostream &os) const override {return os << "<!--" << _text << "-->";}
const XMLComment* toComment () const override {return this;}
private:
std::string _text;
};
class XMLCData : public XMLNode {
public:
XMLCData () =default;
explicit XMLCData (std::string data) : _data(std::move(data)) {}
std::unique_ptr<XMLNode> clone () const override {return util::make_unique<XMLCData>(*this);}
void clear () override {_data.clear();}
void append (std::string &&str);
std::ostream& write (std::ostream &os) const override;
const XMLCData* toCData () const override {return this;}
private:
std::string _data;
};
inline std::ostream& operator << (std::ostream &os, const XMLElement &node) {return node.write(os);}
inline std::ostream& operator << (std::ostream &os, const XMLText &node) {return node.write(os);}
inline std::ostream& operator << (std::ostream &os, const XMLComment &node) {return node.write(os);}
inline std::ostream& operator << (std::ostream &os, const XMLCData &node) {return node.write(os);}
#endif
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