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/*
*
* Copyright (c) 1998-2000
* Dr John Maddock
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Dr John Maddock makes no representations
* about the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*
*/
/*
* FILE jgrep.cpp
* VERSION see <boost/version.hpp>
*/
#include <stdio.h>
#include <boost/regex.hpp>
#ifdef JM_OLD_IOSTREAM
#include <iostream.h>
#else
#include <iostream>
using std::cout;
using std::cin;
using std::cerr;
using std::endl;
#endif
#pragma hrdstop
#include <boost/regex/detail/fileiter.hpp>
#include "jgrep.h"
//
// class ogrep_predicate
// outputs the results of regex_grep to screen:
template <class iterator, class Allocator >
class ogrep_predicate
{
unsigned int& lines;
const char* filename;
unsigned int last_line;
iterator end_of_storage;
public:
ogrep_predicate(unsigned int& i, const char* p, iterator e) : lines(i), filename(p), last_line(-1), end_of_storage(e) {}
ogrep_predicate(const ogrep_predicate& o) : lines(o.lines), filename(o.filename), last_line(o.last_line), end_of_storage(o.end_of_storage) {}
bool operator () (const boost::match_results<iterator, Allocator>& i);
};
// ideally we'd ignor the allocator type and use a template member function
// to deel with the allocator type passed to regex_grep, unfortunately most
// compilers don't support this feature yet, so we'll have to be sure that
// the allocator passed to instances of this class match that used in our
// regular expression classes.
template <class iterator, class Allocator>
bool ogrep_predicate<iterator, Allocator>::operator()(const boost::match_results<iterator, Allocator>& i)
{
if(last_line == (unsigned int)-1)
cout << "File " << filename << ":" << endl;
if(last_line != i.line())
{
++lines;
last_line = i.line();
if(count_only == 0)
{
if(show_lines)
cout << i.line() << "\t";
iterator ptr = i.line_start();
while((ptr != end_of_storage) && (*ptr != '\n'))++ptr;
iterator pos = i.line_start();
while(pos != ptr)
{
cout.put(*pos);
++pos;
}
cout << endl;
}
}
return true;
}
void process_grep(const char* file)
{
using namespace boost;
mapfile f(file);
unsigned int count = 0;
ogrep_predicate<mapfile::iterator, allocator_type> oi(count, file, f.end());
if(files_only)
{
bool ok;
boost::match_results<mapfile::iterator, allocator_type> m;
ok = regex_search(f.begin(), f.end(), m, e, match_not_dot_newline | match_not_dot_null);
if(ok)
cout << "File " << file << endl;
}
else
{
regex_grep(oi, f.begin(), f.end(), e, match_not_dot_newline | match_not_dot_null);
if(count)
{
if(verbose || count_only)
{
cout << count << " lines match" << endl;
return;
}
}
else if(verbose)
{
cout << "File " << file << "(" << f.size() << "bytes):" << endl << "0 lines match" << endl;
}
}
}
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