mirror of https://github.com/vitalif/grive2
133 lines
3.4 KiB
C++
133 lines
3.4 KiB
C++
/*
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grive: an GPL program to sync a local directory with Google Drive
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Copyright (C) 2012 Wan Wai Ho
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation version 2
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of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "TreeBuilder.hh"
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#include "Error.hh"
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#include "Node.hh"
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#include "util/log/Log.hh"
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#include <cassert>
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#include <iostream>
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#include <fstream>
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namespace gr { namespace xml {
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struct TreeBuilder::Impl
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{
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std::vector<Node> stack ;
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::XML_Parser psr ;
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} ;
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TreeBuilder::TreeBuilder() : m_impl( new Impl )
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{
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m_impl->stack.push_back( Node() ) ;
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m_impl->psr = ::XML_ParserCreate( 0 ) ;
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::XML_SetElementHandler( m_impl->psr, &TreeBuilder::StartElement, &TreeBuilder::EndElement ) ;
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::XML_SetCharacterDataHandler( m_impl->psr, &TreeBuilder::OnCharData ) ;
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::XML_SetUserData( m_impl->psr , this ) ;
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is_new = true ;
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}
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TreeBuilder::~TreeBuilder()
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{
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}
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Node TreeBuilder::ParseFile( const std::string& file )
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{
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TreeBuilder tb ;
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::XML_Parser p = tb.m_impl->psr ;
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std::ifstream f( file.c_str() ) ;
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const std::size_t block_size = 10 ;
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std::size_t count = 0 ;
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while ( (count = f.rdbuf()->sgetn( (char*)::XML_GetBuffer( p, block_size ), block_size ) ) > 0 )
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XML_ParseBuffer( p, count, false ) ;
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XML_ParseBuffer( p, 0, true ) ;
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return tb.Result() ;
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}
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void TreeBuilder::ParseData( const char *data, std::size_t count, bool last )
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{
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is_new = false ;
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if ( ::XML_Parse( m_impl->psr, data, count, last ) == 0 ) {
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Log("Error parsing XML: %1%", data, log::error);
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BOOST_THROW_EXCEPTION( Error() << ExpatApiError("XML_Parse") );
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}
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}
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Node TreeBuilder::Parse( const std::string& xml )
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{
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TreeBuilder tb ;
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tb.ParseData( xml.c_str(), xml.size(), true ) ;
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return tb.Result() ;
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}
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Node TreeBuilder::Result() const
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{
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// the node on the stack should be the dummy node with only one child
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assert( m_impl->stack.size() == 1 ) ;
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if ( m_impl->stack.front().size() != 1 )
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BOOST_THROW_EXCEPTION( Error() << LogicError(0) ) ;
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return *m_impl->stack.front().begin() ;
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}
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void TreeBuilder::StartElement( void *pvthis, const char *name, const char **attr )
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{
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assert( pvthis != 0 ) ;
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assert( name != 0 ) ;
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assert( attr != 0 ) ;
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TreeBuilder *pthis = reinterpret_cast<TreeBuilder*>(pvthis) ;
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Node n = pthis->m_impl->stack.back().AddElement( name ) ;
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for ( std::size_t i = 0 ; attr[i] != 0 ; i += 2 )
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{
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assert( attr[i+1] != 0 ) ;
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n.AddAttribute( attr[i], attr[i+1] ) ;
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}
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pthis->m_impl->stack.push_back( n ) ;
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}
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void TreeBuilder::EndElement( void* pvthis, const char* name )
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{
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TreeBuilder *pthis = reinterpret_cast<TreeBuilder*>(pvthis) ;
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assert( pthis->m_impl->stack.back().Name() == name ) ;
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pthis->m_impl->stack.pop_back() ;
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}
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void TreeBuilder::OnCharData( void *pvthis, const char *s, int len )
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{
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TreeBuilder *pthis = reinterpret_cast<TreeBuilder*>(pvthis) ;
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pthis->m_impl->stack.back().AddText( std::string( s, len ) ) ;
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}
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} } // end of namespace
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