regex.h

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#ifndef REGEX_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM
#define REGEX_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM

#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif


#include <vector>
#include <string>

namespace YAML_PM
{
        class Stream;

        enum REGEX_OP { REGEX_EMPTY, REGEX_MATCH, REGEX_RANGE, REGEX_OR, REGEX_AND, REGEX_NOT, REGEX_SEQ };

        // simplified regular expressions
        // . Only straightforward matches (no repeated characters)
        // . Only matches from start of string
        class RegEx
        {
        public:
                RegEx();
                RegEx(char ch);
                RegEx(char a, char z);
                RegEx(const std::string& str, REGEX_OP op = REGEX_SEQ);
                ~RegEx() {}

                friend RegEx operator ! (const RegEx& ex);
                friend RegEx operator || (const RegEx& ex1, const RegEx& ex2);
                friend RegEx operator && (const RegEx& ex1, const RegEx& ex2);
                friend RegEx operator + (const RegEx& ex1, const RegEx& ex2);
                
                bool Matches(char ch) const;
                bool Matches(const std::string& str) const;
                bool Matches(const Stream& in) const;
                template <typename Source> bool Matches(const Source& source) const;

                int Match(const std::string& str) const;
                int Match(const Stream& in) const;
                template <typename Source> int Match(const Source& source) const;

        private:
                RegEx(REGEX_OP op);
                
                template <typename Source> bool IsValidSource(const Source& source) const;
                template <typename Source> int MatchUnchecked(const Source& source) const;

                template <typename Source> int MatchOpEmpty(const Source& source) const;
                template <typename Source> int MatchOpMatch(const Source& source) const;
                template <typename Source> int MatchOpRange(const Source& source) const;
                template <typename Source> int MatchOpOr(const Source& source) const;
                template <typename Source> int MatchOpAnd(const Source& source) const;
                template <typename Source> int MatchOpNot(const Source& source) const;
                template <typename Source> int MatchOpSeq(const Source& source) const;

        private:
                REGEX_OP m_op;
                char m_a, m_z;
                std::vector <RegEx> m_params;
        };
}

#include "regeximpl.h"

#endif // REGEX_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM