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Regexp.h

/*
 * Copyright (c) 2004 Mellanox Technologies LTD. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id$
 */

#ifndef IBDM_REXIFC_H
#define IBDM_REXIFC_H

// this file holds simplified object oriented interface for
// reguar expressions
#include <string.h>
#include <sys/types.h>
#include <regex.h>
#include <stdio.h>
#include <iostream>
#include <string>

using namespace std;

class rexMatch {
  const char *str;
  int  nMatches;
  regmatch_t *matches;

 public:
  // no default constructor
  rexMatch();

  // construct:
  rexMatch(const char *s, int numMatches) {
       str = s;
       nMatches = numMatches;
       matches = new regmatch_t[nMatches + 1];
  };

  // destrutor:
  ~rexMatch() {
       delete [] matches;
  };

  // usefull:
  int field(int num, char *buf) {
       // check for non match:
       if (num > nMatches || matches[num].rm_so < 0) {
            buf[0] = '\0';
            return 0;
       }
       strncpy(buf, str + matches[num].rm_so, matches[num].rm_eo - matches[num].rm_so + 1);
       buf[matches[num].rm_eo - matches[num].rm_so] = '\0';
       return 0;
  };

  // string returning the field
  int field(int num, string &res) {
       string tmp = string(str);
       // check for non match:
       if (num > nMatches || matches[num].rm_so < 0) {
            res = "";
            return 0;
       }
       res = tmp.substr(matches[num].rm_so, matches[num].rm_eo - matches[num].rm_so);
       return 0;
  };

  string field(int num) {
       string tmp = string(str);
       // check for non match:
       if (num > nMatches || matches[num].rm_so < 0) {
            return string("");
       }
       return tmp.substr(matches[num].rm_so, matches[num].rm_eo - matches[num].rm_so);
  };

  inline int numFields() {return nMatches;};

  friend class regExp;
};

// this will basically hold the compiled regular expression
class regExp {
  regex_t re;
  char *expr;
  int status;
 public:
  // prevent default constructor
  regExp();

  // construct
  regExp(const char *pattern, int flags = REG_EXTENDED) {
       expr = new char[strlen(pattern) + 1];
       strcpy(expr, pattern);
       status = regcomp(&re, expr, flags);
       if (status) {
            cout << "-E- Fail to compile regular expression:%s\n" << pattern << endl;
       }
  }

  // destructor
  ~regExp() {
       regfree(&re);
       delete [] expr;
  }

  // access:
  inline const char *getExpr() const {return expr;};
  inline int valid() const {return (status == 0);};

  // usefullnss:
  class rexMatch * apply(const char *str, int flags = 0) {
       class rexMatch *res = new rexMatch(str, re.re_nsub);
       if (regexec(&re, str, re.re_nsub + 1, res->matches, flags)) {
            delete res;
            return 0;
       }
       return res;
  }

  friend class rexMatch;
};

// holds specifc compares

#endif /* IBDM_REXIFC_H */


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