path: root/libsolidity/analysis/SemVerHandler.h

/*
    This file is part of cpp-ethereum.

    cpp-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @author Christian <chris@ethereum.org>
 * @date 2016
 * Utilities to handle semantic versioning.
 */

#pragma once

#include <vector>
#include <libsolidity/parsing/Token.h>

namespace dev
{
namespace solidity
{

class SemVerError: dev::Exception
{
};

struct SemVerVersion
{
    unsigned numbers[3];
    std::string prerelease;
    std::string build;

    unsigned major() const { return numbers[0]; }
    unsigned minor() const { return numbers[1]; }
    unsigned patch() const { return numbers[2]; }

    bool isPrerelease() const { return !prerelease.empty(); }

    explicit SemVerVersion(std::string const& _versionString = "0.0.0");
};

struct SemVerMatchExpression
{
    bool matches(SemVerVersion const& _version) const;

    bool isValid() const { return !m_disjunction.empty(); }

    struct MatchComponent
    {
        /// Prefix from < > <= >= ~ ^
        Token::Value prefix = Token::Illegal;
        /// Version, where unsigned(-1) in major, minor or patch denotes '*', 'x' or 'X'
        SemVerVersion version;
        /// Whether we have 1, 1.2 or 1.2.4
        unsigned levelsPresent = 1;
        bool matches(SemVerVersion const& _version) const;
    };

    struct Conjunction
    {
        std::vector<MatchComponent> components;
        bool matches(SemVerVersion const& _version) const;
    };

    std::vector<Conjunction> m_disjunction;
};

class SemVerMatchExpressionParser
{
public:
    SemVerMatchExpressionParser(std::vector<Token::Value> const& _tokens, std::vector<std::string> const& _literals):
        m_tokens(_tokens), m_literals(_literals)
    {}
    SemVerMatchExpression parse();

private:
    void reset();

    void parseMatchExpression();
    SemVerMatchExpression::MatchComponent parseMatchComponent();
    unsigned parseVersionPart();

    char currentChar() const;
    char nextChar();
    Token::Value currentToken() const;
    void nextToken();

    std::vector<Token::Value> m_tokens;
    std::vector<std::string> m_literals;

    unsigned m_pos = 0;
    unsigned m_posInside = 0;

    SemVerMatchExpression m_expression;
};

}
}