stem_porter.h

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/*
    STEM_PORTER.H
    -------------
*/
#pragma once

#include <stdio.h>

#include "stem.h"
#include "ascii.h"

#define MAX_TERM_LENGTH 1024

namespace JASS
    {
    /*
        CLASS STEM_PORTER
        -----------------
    */
    class stem_porter : public stem
        {
        private:
            std::string workspace;      // temporary workspace used to reverse the string.
            
        private:
            /*
                STEM_PORTER::ISVOWELY()
                -----------------------
            */
            bool isvowely(const char *c)
                {
                return *c != '\0' && (ascii::isvowel(*c) || (*c == 'y' && !ascii::isvowel(*(c + 1))));
                }

            /*
                STEM_PORTER::CVC()
                ------------------
                the stem ends cvc, where the second c is not W, X or Y (e.g. -WIL, -HOP).
            */
            bool cvc(const char *what)
                {
                return ((strchr("aeiouwxy", *what) == NULL) && (isvowely(what + 1)) && (!isvowely(what + 2))) ? true : false;
                }

            /*
                STEM_PORTER::LENGTH()
                ---------------------
            */
            size_t length(const char *reversed);

            /*
                STEM_PORTER::HAS_VOWEL()
                ------------------------
            */
            bool has_vowel(const char *what);

        public:
            /*
                STEM_PORTER::~STEM_PORTER()
                ---------------------------
            */
            virtual ~stem_porter()
                {
                /* Nothing */
                }

            /*
              STEM_PORTER::NAME()
              -------------------
            */
            virtual std::string name(void)
                {
                return "Porter";
                }

            /*
                STEM_PORTER::TOSTEM()
                ---------------------
            */
            using stem::tostem;
            virtual size_t tostem(char *destination, const char *source, size_t source_length);

            /*
                STEM_PORTER::UNITTEST()
                -----------------------
            */
            static void unittest(void);
        } ;

    }