/usr/include/SFCGAL/detail/tools/InputStreamReader.h is in libsfcgal-dev 1.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* SFCGAL
*
* Copyright (C) 2012-2013 Oslandia <infos@oslandia.com>
* Copyright (C) 2012-2013 IGN (http://www.ign.fr)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _SFCGAL_TOOLS_INPUTSTREAMREADER_H_
#define _SFCGAL_TOOLS_INPUTSTREAMREADER_H_
#include <SFCGAL/config.h>
#include <cctype>
#include <string>
#include <sstream>
#include <stack>
namespace SFCGAL {
namespace tools {
template < typename CharType > class BasicInputStreamReader ;
/**
* typedef for std::istream
*/
typedef BasicInputStreamReader< char > InputStreamReader ;
/**
* typedef for std::wistream
*/
typedef BasicInputStreamReader< wchar_t > WInputStreamReader ;
/**
* Helper class to parse data from stream.
*/
template < typename CharType >
class BasicInputStreamReader {
public:
typedef CharType char_type ;
typedef typename std::basic_string< char_type > string_type ;
typedef typename std::basic_istream< char_type > istream_type ;
typedef typename std::basic_istream< char_type >::pos_type pos_type ;
/// \brief constructor with an input stream
BasicInputStreamReader( istream_type& s, bool skipWhiteSpaces = true ):
_s( s ),
_states(),
_skipWhiteSpaces( skipWhiteSpaces ) {
_s >> std::noskipws ;
}
/// \brief try to match a char in the input stream
bool match( char_type const& c ) {
begin();
if ( _skipWhiteSpaces ) {
skipWhiteSpaces();
}
if ( ! _s.eof() && _s.get() == c ) {
commit();
return true ;
}
else {
rollback();
return false;
}
}
/// \brief try to match a char in the input stream, case-insensitive variant
bool imatch( char_type const& c ) {
begin();
if ( _skipWhiteSpaces ) {
skipWhiteSpaces();
}
if ( ! _s.eof() && ::tolower( _s.get() ) == ::tolower( c ) ) {
commit();
return true ;
}
else {
rollback();
return false;
}
}
/// \brief try to match a string in the input stream
bool match( string_type const& str ) {
begin();
if ( _skipWhiteSpaces ) {
skipWhiteSpaces();
}
for ( typename string_type::const_iterator it = str.begin(); it != str.end(); ++it ) {
if ( ! _s.eof() && _s.get() == *it ) {
continue ;
}
rollback();
return false ;
}
commit();
return true ;
}
/// \brief try to match a string in the input stream, case-insensitive variant
bool imatch( string_type const& str ) {
begin();
if ( _skipWhiteSpaces ) {
skipWhiteSpaces();
}
for ( typename string_type::const_iterator it = str.begin(); it != str.end(); ++it ) {
if ( ! _s.eof() && ::tolower( _s.get() ) == ::tolower( *it ) ) {
continue ;
}
rollback();
return false ;
}
commit();
return true ;
}
/// \brief try to read a value in the input stream, restore state if read fails
template < typename T >
bool read( T& value ) {
begin();
if ( _skipWhiteSpaces ) {
skipWhiteSpaces();
}
if ( _s >> value ) {
commit();
return true ;
}
else {
rollback();
return false ;
}
}
/// \brief save input stream state (read position)
void begin() {
_states.push( _s.tellg() );
}
/// \brief validate read from input stream
void commit() {
_states.pop();
}
/// \brief restore stream state (read position)
void rollback() {
_s.seekg( _states.top() ) ;
_s.clear();
_states.pop();
}
/// \brief test if read is complete (either tried to reader after eof, either on eof)
bool eof() const {
return _s.eof() || ( _s.peek() == std::char_traits< char_type >::eof() ) ;
}
/// \brief returns the wrapped stream
inline istream_type& s() {
return _s;
}
/// \brief returns the wrapped stream
inline istream_type const& s() const {
return _s;
}
/**
* returns a string corresponding to the current state
*/
string_type context( size_t nMax = 20 ) {
begin();
std::basic_ostringstream< char_type > oss ;
for ( size_t i = 0; i < nMax; i++ ) {
if ( eof() ) {
break;
}
oss << ( char_type )s().get();
}
if ( ! eof() ) {
oss << "..." ;
}
rollback();
return oss.str();
}
private:
/// \brief the input stream
istream_type& _s ;
/// \brief read position saved
std::stack< pos_type > _states ;
/// \brief indicates if white chars should be skipped
bool _skipWhiteSpaces ;
/// \brief skip white spaces
void skipWhiteSpaces() {
while ( ! _s.eof() && std::isspace( _s.peek() ) ) {
_s.get();
continue;
}
}
/// \brief no copy
BasicInputStreamReader( BasicInputStreamReader const& other );
};
}//tools
}//ign
#endif
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