cregex.cpp

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/*
 *
 * Copyright (c) 1998-2002
 * John Maddock
 *
 * Use, modification and distribution are subject to the 
 * Boost Software License, Version 1.0. (See accompanying file 
 * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 *
 */

 /*
  *   LOCATION:    see http://www.boost.org for most recent version.
  *   FILE:        cregex.cpp
  *   VERSION:     see <boost/version.hpp>
  *   DESCRIPTION: Implements high level class boost::RexEx
  */


#define BOOST_REGEX_SOURCE

#include <boost/regex.hpp>
#include <boost/cregex.hpp>
#if !defined(BOOST_NO_STD_STRING)
#include <map>
#include <list>
#include <boost/regex/v4/fileiter.hpp>
typedef boost::match_flag_type match_flag_type;
#include <cstdio>

namespace boost{

#ifdef __BORLANDC__
#if __BORLANDC__ < 0x530
//
// we need to instantiate the vector classes we use
// since declaring a reference to type doesn't seem to
// do the job...
std::vector<std::size_t> inst1;
std::vector<std::string> inst2;
#endif
#endif

namespace{

template <class iterator>
std::string to_string(iterator i, iterator j)
{
   std::string s;
   while(i != j)
   {
      s.append(1, *i);
      ++i;
   }
   return s;
}

inline std::string to_string(const char* i, const char* j)
{
   return std::string(i, j);
}

}
namespace re_detail{

class RegExData
{
public:
   enum type
   {
      type_pc,
      type_pf,
      type_copy
   };
   regex e;
   cmatch m;
#ifndef BOOST_REGEX_NO_FILEITER
   match_results<mapfile::iterator> fm;
#endif
   type t;
   const char* pbase;
#ifndef BOOST_REGEX_NO_FILEITER
   mapfile::iterator fbase;
#endif
   std::map<int, std::string, std::less<int> > strings;
   std::map<int, std::ptrdiff_t, std::less<int> > positions;
   void update();
   void clean();
   RegExData() : e(), m(),
#ifndef BOOST_REGEX_NO_FILEITER
   fm(),
#endif
   t(type_copy), pbase(0),
#ifndef BOOST_REGEX_NO_FILEITER
   fbase(),
#endif
   strings(), positions() {}
};

void RegExData::update()
{
   strings.erase(strings.begin(), strings.end());
   positions.erase(positions.begin(), positions.end());
   if(t == type_pc)
   {
      for(unsigned int i = 0; i < m.size(); ++i)
      {
         if(m[i].matched) strings[i] = std::string(m[i].first, m[i].second);
         positions[i] = m[i].matched ? m[i].first - pbase : -1;
      }
   }
#ifndef BOOST_REGEX_NO_FILEITER
   else
   {
      for(unsigned int i = 0; i < fm.size(); ++i)
      {
         if(fm[i].matched) strings[i] = to_string(fm[i].first, fm[i].second);
         positions[i] = fm[i].matched ? fm[i].first - fbase : -1;
      }
   }
#endif
   t = type_copy;
}

void RegExData::clean()
{
#ifndef BOOST_REGEX_NO_FILEITER
   fbase = mapfile::iterator();
   fm = match_results<mapfile::iterator>();
#endif
}

} // namespace

RegEx::RegEx()
{
   pdata = new re_detail::RegExData();
}

RegEx::RegEx(const RegEx& o)
{
   pdata = new re_detail::RegExData(*(o.pdata));
}

RegEx::~RegEx()
{
   delete pdata;
}

RegEx::RegEx(const char* c, bool icase)
{
   pdata = new re_detail::RegExData();
   SetExpression(c, icase);
}

RegEx::RegEx(const std::string& s, bool icase)
{
   pdata = new re_detail::RegExData();
   SetExpression(s.c_str(), icase);
}

RegEx& RegEx::operator=(const RegEx& o)
{
   *pdata = *(o.pdata);
   return *this;
}

RegEx& RegEx::operator=(const char* p)
{
   SetExpression(p, false);
   return *this;
}

unsigned int RegEx::SetExpression(const char* p, bool icase)
{
   boost::uint_fast32_t f = icase ? regex::normal | regex::icase : regex::normal;
   return pdata->e.set_expression(p, f);
}

unsigned int RegEx::error_code()const
{
   return pdata->e.error_code();
}


std::string RegEx::Expression()const
{
   return pdata->e.expression();
}

//
// now matching operators:
//
bool RegEx::Match(const char* p, match_flag_type flags)
{
   pdata->t = re_detail::RegExData::type_pc;
   pdata->pbase = p;
   const char* end = p;
   while(*end)++end;

   if(regex_match(p, end, pdata->m, pdata->e, flags))
   {
      pdata->update();
      return true;
   }
   return false;
}

bool RegEx::Search(const char* p, match_flag_type flags)
{
   pdata->t = re_detail::RegExData::type_pc;
   pdata->pbase = p;
   const char* end = p;
   while(*end)++end;

   if(regex_search(p, end, pdata->m, pdata->e, flags))
   {
      pdata->update();
      return true;
   }
   return false;
}
namespace re_detail{
struct pred1
{
   GrepCallback cb;
   RegEx* pe;
   pred1(GrepCallback c, RegEx* i) : cb(c), pe(i) {}
   bool operator()(const cmatch& m)
   {
      pe->pdata->m = m;
      return cb(*pe);
   }
};
}
unsigned int RegEx::Grep(GrepCallback cb, const char* p, match_flag_type flags)
{
   pdata->t = re_detail::RegExData::type_pc;
   pdata->pbase = p;
   const char* end = p;
   while(*end)++end;

   unsigned int result = regex_grep(re_detail::pred1(cb, this), p, end, pdata->e, flags);
   if(result)
      pdata->update();
   return result;
}
namespace re_detail{
struct pred2
{
   std::vector<std::string>& v;
   RegEx* pe;
   pred2(std::vector<std::string>& o, RegEx* e) : v(o), pe(e) {}
   bool operator()(const cmatch& m)
   {
      pe->pdata->m = m;
      v.push_back(std::string(m[0].first, m[0].second));
      return true;
   }
private:
   pred2& operator=(const pred2&);
};
}

unsigned int RegEx::Grep(std::vector<std::string>& v, const char* p, match_flag_type flags)
{
   pdata->t = re_detail::RegExData::type_pc;
   pdata->pbase = p;
   const char* end = p;
   while(*end)++end;

   unsigned int result = regex_grep(re_detail::pred2(v, this), p, end, pdata->e, flags);
   if(result)
      pdata->update();
   return result;
}
namespace re_detail{
struct pred3
{
   std::vector<std::size_t>& v;
   const char* base;
   RegEx* pe;
   pred3(std::vector<std::size_t>& o, const char* pb, RegEx* p) : v(o), base(pb), pe(p) {}
   bool operator()(const cmatch& m)
   {
      pe->pdata->m = m;
      v.push_back(static_cast<std::size_t>(m[0].first - base));
      return true;
   }
private:
   pred3& operator=(const pred3&);
};
}
unsigned int RegEx::Grep(std::vector<std::size_t>& v, const char* p, match_flag_type flags)
{
   pdata->t = re_detail::RegExData::type_pc;
   pdata->pbase = p;
   const char* end = p;
   while(*end)++end;

   unsigned int result = regex_grep(re_detail::pred3(v, p, this), p, end, pdata->e, flags);
   if(result)
      pdata->update();
   return result;
}
#ifndef BOOST_REGEX_NO_FILEITER
namespace re_detail{
struct pred4
{
   GrepFileCallback cb;
   RegEx* pe;
   const char* file;
   bool ok;
   pred4(GrepFileCallback c, RegEx* i, const char* f) : cb(c), pe(i), file(f), ok(true) {}
   bool operator()(const match_results<mapfile::iterator>& m)
   {
      pe->pdata->t = RegExData::type_pf;
      pe->pdata->fm = m;
      pe->pdata->update();
      ok = cb(file, *pe);
      return ok;
   }