boost::spirit真是不錯(cuò)的說。。。。
#include <iostream>
#include <iterator>
#include <vector>
#include <string>
#include <boost/spirit/core.hpp>
#include <boost/spirit/iterator/file_iterator.hpp>
using namespace std;
using namespace boost::spirit;
template<typename IteratorT>
struct LineInfo
{
IteratorT lineIter;
size_t lineNum;
LineInfo( IteratorT beg ) : lineIter(beg), lineNum(1) { }
};
template<typename IteratorT>
struct NewLine
{
LineInfo<IteratorT>& lineInfo;
NewLine( LineInfo<IteratorT>& info ) : lineInfo(info) { }
void operator()(IteratorT first, IteratorT last) const
{
lineInfo.lineIter = last;
lineInfo.lineNum++;
}
};
struct AddVal
{
vector<string>& values;
AddVal( vector<string>& vec ) : values(vec) { }
template<class IteratorT>
void operator()(IteratorT first, IteratorT last) const
{
#ifdef _MSC_VER
string s;
s.resize(distance(first, last));
for (size_t i = 0; first != last; ++i)
{
s[i] = *first++;
}
#else
string s( first, last );
#endif
string::size_type pos = 0;
while (1)
{
pos = s.find("\"\"", pos);
if (pos == string::npos)
break;
++pos;
s.erase(pos, 1);
}
values.push_back(s);
}
};
template<class IteratorT>
struct CSVParser : public grammar<CSVParser<IteratorT> >
{
vector<string>& v;
LineInfo<IteratorT>& lineInfo;
CSVParser( vector<string>& vec, LineInfo<IteratorT>& info ) : v(vec), lineInfo(info) { }
template <typename ScannerT>
struct definition
{
rule<ScannerT> csv, val, quoted_val, naked_val;
definition(const CSVParser<IteratorT>& self)
{
csv = val >> *(',' >> val) >>
(eol_p[NewLine<IteratorT>(self.lineInfo)] | end_p);
val = *blank_p >>
ch_p('\"') >> quoted_val[AddVal(self.v)] >> ch_p('\"') >>
*blank_p
| naked_val[AddVal(self.v)];
quoted_val = *(eol_p[NewLine<IteratorT>(self.lineInfo)]
| ~ch_p('"') | str_p("\"\""));
naked_val = *(~ch_p(',') & ~ch_p('\"') & ~ch_p('\n'));
}
const rule<ScannerT>& start() const { return csv; }
};
};
template<typename IteratorT>
parse_info<IteratorT>
parse_csv( const IteratorT& first, const IteratorT& last,
vector<string>& vec, LineInfo<IteratorT>& info )
{
CSVParser<IteratorT> csv(vec, info);
return parse(first, last, csv);
}
int main( int argc, char** argv)
{
if (argc != 2) return 1;
typedef file_iterator<char> iterator_t;
iterator_t begin(argv[1]);
if (!begin)
{
cout << "Unable to open file: " << argv[1] << endl;
return -1;
}
iterator_t first = begin;
iterator_t last = first.make_end();
LineInfo<iterator_t> line_info( begin );
while ( first != last )
{
vector<string> v;
parse_info<iterator_t> info = parse_csv( first, last, v, line_info );
if (!info.hit)
{
cout << "Error!! Line: " << line_info.lineNum
<< ", Column: " << distance(line_info.lineIter, info.stop)+1 << endl;
break;
}
cout << "Parses OK:" << endl;
for (vector<string>::size_type i = 0; i < v.size(); ++i)
cout << i+1 << ": " << v[i] << endl;
cout << "-------------------------\n";
first = info.stop;
}
return 0;
}