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// Standard C++
#include <array>
#include <memory>
#include <span>
#include <sstream>
// Project
#include "xml.hpp"
// Expat XML Parser
#include "expat.h"
using namespace std;
void
XML::parse(istream& ins)
{
unique_ptr<XML_ParserStruct, decltype(&::XML_ParserFree)> parser(::XML_ParserCreate(nullptr), ::XML_ParserFree);
if ( !parser ) {
throw bad_alloc();
}
// setup expat
::XML_SetUserData(parser.get(), this);
::XML_SetElementHandler(parser.get(), tag_start, tag_end);
::XML_SetCdataSectionHandler(parser.get(), cdata_start, cdata_end);
::XML_SetCharacterDataHandler(parser.get(), data);
constexpr auto buffer_size = 2048;
array<char, buffer_size> buffer{};
for ( bool done = false; !done; ) {
ins.read(buffer.data(), buffer_size);
done = ins.gcount() < buffer_size;
if ( ::XML_Parse(parser.get(), buffer.data(), static_cast<int>(ins.gcount()), static_cast<int>(done)) != XML_STATUS_OK ) {
stringstream msg;
msg << ::XML_ErrorString(XML_GetErrorCode(parser.get()));
msg << " in line " << ::XML_GetCurrentLineNumber(parser.get());
throw runtime_error(msg.str());
}
}
}
void
XML::tag_start(void* self, const char* name, const char** attr)
{
vector<tuple<string_view, string_view>> attr_temp;
for ( auto i = 0; attr[i] != nullptr; i += 2 ) {
attr_temp.emplace_back(attr[i], attr[i + 1]);
}
static_cast<XML*>(self)->handle_start(name, attr_temp);
}
void
XML::tag_end(void* self, const char* name)
{
static_cast<XML*>(self)->handle_end(name);
}
void
XML::cdata_start(void* self)
{
static_cast<XML*>(self)->handle_cdata_start();
}
void
XML::cdata_end(void* self)
{
static_cast<XML*>(self)->handle_cdata_end();
}
void
XML::data(void* self, const char* dat, int len)
{
static_cast<XML*>(self)->handle_character_data({ dat, static_cast<size_t>(len) });
}
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