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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_EXPAT_HXX
#define MPD_EXPAT_HXX
#include "check.h"
#include "Compiler.h"
#include <expat.h>
#include <stdexcept>
class InputStream;
class ExpatError final : public std::runtime_error {
public:
explicit ExpatError(XML_Error code)
:std::runtime_error(XML_ErrorString(code)) {}
explicit ExpatError(XML_Parser parser)
:ExpatError(XML_GetErrorCode(parser)) {}
};
struct ExpatNamespaceSeparator {
char separator;
};
class ExpatParser final {
const XML_Parser parser;
public:
explicit ExpatParser(void *userData)
:parser(XML_ParserCreate(nullptr)) {
XML_SetUserData(parser, userData);
}
ExpatParser(ExpatNamespaceSeparator ns, void *userData)
:parser(XML_ParserCreateNS(nullptr, ns.separator)) {
XML_SetUserData(parser, userData);
}
~ExpatParser() {
XML_ParserFree(parser);
}
ExpatParser(const ExpatParser &) = delete;
ExpatParser &operator=(const ExpatParser &) = delete;
void SetElementHandler(XML_StartElementHandler start,
XML_EndElementHandler end) noexcept {
XML_SetElementHandler(parser, start, end);
}
void SetCharacterDataHandler(XML_CharacterDataHandler charhndl) noexcept {
XML_SetCharacterDataHandler(parser, charhndl);
}
void Parse(const char *data, size_t length, bool is_final=false);
void CompleteParse() {
Parse("", 0, true);
}
void Parse(InputStream &is);
gcc_pure
static const char *GetAttribute(const XML_Char **atts,
const char *name) noexcept;
gcc_pure
static const char *GetAttributeCase(const XML_Char **atts,
const char *name) noexcept;
};
/**
* A specialization of #ExpatParser that provides the most common
* callbacks as virtual methods.
*/
class CommonExpatParser {
ExpatParser parser;
public:
CommonExpatParser():parser(this) {
parser.SetElementHandler(StartElement, EndElement);
parser.SetCharacterDataHandler(CharacterData);
}
explicit CommonExpatParser(ExpatNamespaceSeparator ns)
:parser(ns, this) {
parser.SetElementHandler(StartElement, EndElement);
parser.SetCharacterDataHandler(CharacterData);
}
template<typename... Args>
void Parse(Args&&... args) {
parser.Parse(std::forward<Args>(args)...);
}
void CompleteParse() {
parser.CompleteParse();
}
gcc_pure
static const char *GetAttribute(const XML_Char **atts,
const char *name) noexcept {
return ExpatParser::GetAttribute(atts, name);
}
gcc_pure
static const char *GetAttributeCase(const XML_Char **atts,
const char *name) noexcept {
return ExpatParser::GetAttributeCase(atts, name);
}
protected:
virtual void StartElement(const XML_Char *name,
const XML_Char **atts) = 0;
virtual void EndElement(const XML_Char *name) = 0;
virtual void CharacterData(const XML_Char *s, int len) = 0;
private:
static void XMLCALL StartElement(void *user_data, const XML_Char *name,
const XML_Char **atts) {
CommonExpatParser &p = *(CommonExpatParser *)user_data;
p.StartElement(name, atts);
}
static void XMLCALL EndElement(void *user_data, const XML_Char *name) {
CommonExpatParser &p = *(CommonExpatParser *)user_data;
p.EndElement(name);
}
static void XMLCALL CharacterData(void *user_data,
const XML_Char *s, int len) {
CommonExpatParser &p = *(CommonExpatParser *)user_data;
p.CharacterData(s, len);
}
};
#endif
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