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#include "textreplacement.h"

QT_BEGIN_NAMESPACE

bool TextReplacements::insert(QByteArray newText, int insertPosition, int currentLenght)

{

    //bubble sort the new replacement into the list

    int i;

    for(i=0; i<textReplacementList.size(); ++i) {

        if (insertPosition == textReplacementList.at(i).insertPosition)

            return false; // multiple replacements on the same insertPosition is not allowed.

        if(insertPosition < textReplacementList.at(i).insertPosition)

            break;  //we found the right position

    }

    //++i;

  //  cout << "inserting new text " << newText.constData() << endl;

    // %s at %d overwriting %d bytes at list pos %d\n", newText.constData(), insertPosition, currentLenght, i);

    TextReplacement rep;

    rep.newText=newText;

    rep.insertPosition=insertPosition;

    rep.currentLenght=currentLenght;

    textReplacementList.insert(i, rep);

    return true;

}

void TextReplacements::clear()

{

    textReplacementList.clear();

}

QByteArray TextReplacements::apply(QByteArray current)

{

    QByteArray newData=current;

    int i;

    int replacementOffset=0;

    for(i=0; i<textReplacementList.size(); ++i) {

        TextReplacement rep=textReplacementList.at(i);

        //printf("applying new text %s insert at %d overwriting %d bytes \n", rep.newText.constData(), rep.insertPosition, rep.currentLenght);

        newData.remove(rep.insertPosition+replacementOffset, rep.currentLenght);

        newData.insert(rep.insertPosition+replacementOffset, rep.newText);

        //modify all remaining replacements if we change the document length

        replacementOffset+=(rep.newText.size() - rep.currentLenght);

    }

    return newData;

}

TextReplacements &TextReplacements::operator+=(const TextReplacements &other)

{

    foreach(TextReplacement rep, other.replacements()) {

        insert(rep.newText, rep.insertPosition, rep.currentLenght);

    }

    return *this;

}

QT_END_NAMESPACE