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owlps/owlps-positioner/csvstringreader.cc

168 Zeilen
3.7 KiB
C++

/*
* This file is part of the Owl Positioning System (OwlPS) project.
* It is subject to the copyright notice and license terms in the
* COPYRIGHT.t2t file found in the top-level directory of this
* distribution and at
* https://code.lm7.fr/mcy/owlps/src/master/COPYRIGHT.t2t
* No part of the OwlPS Project, including this file, may be copied,
* modified, propagated, or distributed except according to the terms
* contained in the COPYRIGHT.t2t file; the COPYRIGHT.t2t file must be
* distributed along with this file, either separately or by replacing
* this notice by the COPYRIGHT.t2t file's contents.
*/
#include "csvstringreader.hh"
#include "point3d.hh"
#include <iostream>
using namespace std ;
using boost::tokenizer ;
using boost::escaped_list_separator ;
using boost::lexical_cast ;
using boost::bad_lexical_cast ;
/* *** Constructors *** */
CSVStringReader::
CSVStringReader(const std::string &_str, const char _separator):
separator(_separator), current_token(nullptr), current_field_nb(0)
{
set_str(_str) ;
}
CSVStringReader::~CSVStringReader()
{
delete current_token ;
}
/* *** Accessors *** */
/**
* @returns `false` in case of error (EOF, etc.), `true` else.
*/
void CSVStringReader::set_str(const string &_str)
{
str = _str ;
delete current_token ;
// Split read string into fields (semicolon-separated)
current_token = new tokenizer<escaped_list_separator<char> >(
str, escaped_list_separator<char>('\\', separator, '\"')) ;
token_iterator = current_token->begin() ;
current_field_nb = 0 ;
}
/* *** Operations *** */
bool CSVStringReader::read_timestamp(Timestamp &t)
{
string timestamp_str ;
uint_fast32_t time_s, time_ns ;
if (! read_field(timestamp_str))
return false ;
tokenizer<escaped_list_separator<char> > tok(
timestamp_str, escaped_list_separator<char>('\\', '.', '\"')) ;
auto tok_iter = tok.begin() ;
if (tok_iter == tok.end())
return false ;
try
{
time_s = lexical_cast<uint_fast32_t>(*tok_iter) ;
}
catch (bad_lexical_cast &e)
{
print_error_cast() ;
return false ;
}
++tok_iter ;
if (tok_iter == tok.end())
return false ;
try
{
time_ns = lexical_cast<uint_fast32_t>(*tok_iter) ;
}
catch (bad_lexical_cast &e)
{
print_error_cast() ;
return false ;
}
t = Timestamp(time_s, time_ns) ;
return true ;
}
/**
* The first field (X) can start with an opening parenthesis, and the
* last one (Z) can finish with a closing parenthesis.
*
* @param[out] p The variable in which the read Point3D will be stored.
* It is left untouched if a full Point3D cannot be read successfuly.
*
* @returns `true` if the Point3D was read successfuly.
* @returns `false` in case of error.
*/
bool CSVStringReader::read_point3d(Point3D &p)
{
float coord[3] ;
for (unsigned int i = 0 ; i < 3 ; ++i)
{
if (token_iterator == current_token->end())
return false ;
++current_field_nb ;
string field = *token_iterator ;
if (field.empty())
return false ;
/* Handle a leading '(' and a trailing ')' */
if (i == 0 && field.front() == '(')
field.erase(field.begin()) ;
if (i == 2 && field.back() == ')')
field.pop_back() ;
try
{
coord[i] = lexical_cast<float>(field) ;
}
catch (bad_lexical_cast &e)
{
print_error_cast() ;
return false ;
}
++token_iterator ;
}
p.set_coordinates(coord) ;
return true ;
}
void CSVStringReader::print_error_cast() const
{
cerr
<< "Bad value \"" << *token_iterator
<< "\" at field #" << current_field_nb
<< ", of CSV string \"" << str << "\"!" << endl ;
}