thmlvariants.cpp

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/******************************************************************************
 *
 *  thmlvariants.cpp -  SWFilter descendant to hide or show textual variants
 *          in a ThML module
 *
 * $Id: thmlvariants.cpp 2980 2013-09-14 21:51:47Z scribe $
 *
 * Copyright 2002-2013 CrossWire Bible Society (http://www.crosswire.org)
 *  CrossWire Bible Society
 *  P. O. Box 2528
 *  Tempe, AZ  85280-2528
 *
 * This program 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 version 2.
 *
 * 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.
 *
 */

#include <stdlib.h>
#include <thmlvariants.h>
#include <utilstr.h>


SWORD_NAMESPACE_START

namespace {

    static const char oName[] = "Textual Variants";
    static const char oTip[]  = "Switch between Textual Variants modes";
    static const char *choices[4] = { "Primary Reading", "Secondary Reading", "All Readings", "" };

    static const StringList *oValues() {
        static const StringList oVals(&choices[0], &choices[3]);
        return &oVals;
    }
}


ThMLVariants::ThMLVariants() : SWOptionFilter(oName, oTip, oValues()) {
}


ThMLVariants::~ThMLVariants() {
}


char ThMLVariants::processText(SWBuf &text, const SWKey *key, const SWModule *module)
{

    int option = 0;
    if      (optionValue == choices[0]) option = 0;
    else if (optionValue == choices[1]) option = 1;
    else                                option = 2;

    if (option == 0 || option == 1) { //we want primary or variant only
        bool intoken = false;
        bool hide = false;
        bool invar = false;
        
        SWBuf token;
        SWBuf orig = text;
        const char *from = orig.c_str();

        //we use a fixed comparision string to make sure the loop is as fast as the original two blocks with almost the same code
        const char* variantCompareString = (option == 0) ? "div type=\"variant\" class=\"1\"" : "div type=\"variant\" class=\"2\"";
        
        for (text = ""; *from; from++) {
            if (*from == '<') {
                intoken = true;
                token = "";
                continue;
            }
            else if (*from == '>') {    // process tokens
                intoken = false;
                
                if ( !strncmp(token.c_str(), variantCompareString, 28)) { //only one of the variants, length of the two strings is 28 in both cases 
                    invar = true;
                    hide = true;
                    continue;
                }
                if (!strncmp(token.c_str(), "div type=\"variant\"", 18)) {
                    invar = true;
                    continue;
                }
                if (!strncmp(token.c_str(), "/div", 4)) {
                    hide = false;
                    if (invar) {
                        invar = false;
                        continue;
                    }
                }
                if (!hide) {
                    text += '<';
                    text.append(token);
                    text += '>';
                }

                continue;
            }
            if (intoken) {
                token += *from;
            }
            else if (!hide) {
                text += *from;
            }
        }

    }

    return 0;
}



SWORD_NAMESPACE_END