RegexConverterBox.h

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#ifndef REGEXCONVERTER_BOX_H
#define REGEXCONVERTER_BOX_H

#include "SimpleConverterBox.h"
#include <sys/types.h>
#include <regex.h>

BOREALIS_NAMESPACE_BEGIN


class RegexConverterBox : public SimpleConverterBox
{
  protected:
    RegexConverterBox( TupleDescription  schema,
                                   char  delim,
                                 string  regex
                     )
                throw( AuroraException );

  public:
    ~RegexConverterBox();

    struct Subexpr
    {
        Subexpr() {}

        Subexpr(const char *begin, const char *end) : begin(begin), end(end) {}

        const char  *begin;

        const char  *end;

        string as_string() const { return string( begin, end ); }

        template <typename CharArray>
        bool toStringField(CharArray& buf) const
        {
            return toStringField( buf, sizeof buf / sizeof buf[0] );
        }

        bool toStringField( char *field, unsigned int  size ) const;

        int32 toInt() const throw( AuroraException );

        int64 toLong() const throw( AuroraException );

        single toSingle() const throw( AuroraException );

        double toDouble() const throw( AuroraException );
     };

    virtual bool convertTuple(const char *data, unsigned int length, char *out)
        throw (AuroraException);

    virtual bool convertTupleFromRegex(Subexpr match,
                                       const vector<Subexpr>& subexprs,
                                       char *out)
        throw (AuroraException) = 0;

  private:
    string _regex;
    ptr<regex_t> _preg;

    // vector, to avoid constant reallocations
    vector<Subexpr> _subexprs;
};

BOREALIS_NAMESPACE_END
#endif                      // REGEXCONVERTER_BOX_H

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