designator.h

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/*
  Copyright (c) 2015, 2024, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
  This program is designed to work with certain software (including
  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have either included with
  the program or referenced in the documentation.
 
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
 
#ifndef MYSQL_HARNESS_DESIGNATOR_INCLUDED
#define MYSQL_HARNESS_DESIGNATOR_INCLUDED
 
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
 
#include "harness_export.h"
 
/**
 * Class representing a version.
 *
 * Versions consist of a three-position dotted pair
 * `MAJOR.MINOR.PATCH` where MAJOR is the major version number, MINOR
 * is the minor version number, and PATCH is the patch number. Version
 * comparison is done lexicographically in the normal manner so that
 * 1.1.5 < 1.2.1 < 1.2.3.
 */
class Version {
 public:
  friend std::ostream &operator<<(std::ostream &out, const Version &ver) {
    out << ver.str();
    return out;
  }
 
  friend bool operator<(const Version &lhs, const Version &rhs) {
    return (lhs.ver_major < rhs.ver_major) ||
           (lhs.ver_major == rhs.ver_major && lhs.ver_minor < rhs.ver_minor) ||
           (lhs.ver_minor == rhs.ver_minor && lhs.ver_patch < rhs.ver_patch);
  }
 
  friend bool operator==(const Version &lhs, const Version &rhs) {
    return (lhs.ver_major == rhs.ver_major) &&
           (lhs.ver_minor == rhs.ver_minor) && (lhs.ver_patch == rhs.ver_patch);
  }
 
  friend bool operator!=(const Version &lhs, const Version &rhs) {
    return !(lhs == rhs);
  }
 
  friend bool operator<=(const Version &lhs, const Version &rhs) {
    return (lhs < rhs) || (lhs == rhs);
  }
 
  friend bool operator>(const Version &lhs, const Version &rhs) {
    return (rhs < lhs);
  }
 
  friend bool operator>=(const Version &lhs, const Version &rhs) {
    return (lhs > rhs) || (lhs == rhs);
  }
 
  Version(int x, int y, int z = 0) : ver_major(x), ver_minor(y), ver_patch(z) {}
 
  Version() : Version(0, 0, 0) {}
 
  explicit Version(unsigned long ver)
      : ver_major((ver >> 24) & 0xFF),
        ver_minor((ver >> 16) & 0xFF),
        ver_patch(ver & 0xFFFF) {}
 
  std::string str() const {
    std::ostringstream buffer;
    buffer << ver_major << "." << ver_minor << "." << ver_patch;
    return buffer.str();
  }
 
  long ver_major;
  long ver_minor;
  long ver_patch;
};
 
/**
 * Designator grammar
 *
 * root ::= name
 * root ::= name "(" op version ( "," op version )* ")"
 * op ::= "<<" | "<=" | "!=" | "==" | ">>" | ">="
 * version ::= number "." number "." number
 */
 
class HARNESS_EXPORT Designator {
 public:
  explicit Designator(const std::string &str);
 
  enum Relation {
    LESS_THEN,
    LESS_EQUAL,
    EQUAL,
    NOT_EQUAL,
    GREATER_EQUAL,
    GREATER_THEN
  };
 
 public:
  class Constraint : public std::vector<std::pair<Relation, Version>> {
    friend std::ostream &operator<<(std::ostream &out, const Constraint &con) {
      static const char *const name[] = {
          "<<", "<=", "==", "!=", ">=", ">>",
      };
      for (auto item : con) out << name[item.first] << item.second;
      return out;
    }
  };
 
  bool version_good(const Version &ver) const;
 
  std::string plugin;
  Constraint constraint;
 
 private:
  void trace(const std::string &where) const;
 
  [[noreturn]] void parse_error(const std::string &prefix) const;
  std::string::value_type peek() const;
  std::string::value_type next();
 
  Relation parse_relation();
  Version parse_version();
  long parse_number();
  void parse_plugin();
  void parse_root();
  void parse_version_list();
  void skip_space();
 
  const std::string &input_;
  std::string::const_iterator cur_;
};
 
#endif /* MYSQL_HARNESS_DESIGNATOR_INCLUDED */