root/trunk/whisperlib/common/base/re.h

// Copyright (c) 2009, Whispersoft s.r.l.
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//
// 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.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Author: Catalin Popescu

// This is a wrapper around the POSIX regex library for an easy C++
// Usage examples:

#ifndef __COMMON_BASE_RE_H__
#define __COMMON_BASE_RE_H__

#include <regex.h>
#include <string>
#include <whisperlib/common/base/types.h>

namespace re {

class RE {
 public:
  RE(const string& regex, int cflags = 0);
  RE(const char* regex, int cflags = 0);
  ~RE();

  const string& regex() const { return regex_; }

  bool Matches(const char* s);
  bool Matches(const string& s) {
    return Matches(s.c_str());
  }

  bool MatchNext(const char* s, string* ret);
  bool MatchNext(const string& s, string* ret) {
    return MatchNext(s.c_str(), ret);
  }
  void MatchEnd() {
    match_begin_ = true;
    match_.rm_eo = 0;
  }

  bool HasError() const { return err_ != 0; }
  int err() const { return err_; }
  const char* ErrorName() const { return ErrorName(err_); }
  static const char* ErrorName(int err);

 private:
  // the original expression
  const string regex_;
  // the compiled expression
  regex_t reg_;
  int err_;
  regmatch_t match_;
  bool match_begin_;
};
}

#endif  // __COMMON_BASE_RE_H__