/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <ToxWhitespaceStripper.hxx>

#include <o3tl/safeint.hxx>
#include <rtl/ustrbuf.hxx>
#include <sal/log.hxx>


namespace sw {

ToxWhitespaceStripper::ToxWhitespaceStripper(std::u16string_view inputString)
{
    OUStringBuffer buffer;

    bool lastCharacterWasWhitespace = false;
    for (size_t pos = 0; pos < inputString.size(); ++pos) {
        sal_Unicode cur = inputString[pos];

        if (cur == ' ' || cur == '\n' || cur == '\t') {
            // merge consecutive whitespaces (and translate them to spaces)
            if (!lastCharacterWasWhitespace) {
                buffer.append(' ');
            }
            lastCharacterWasWhitespace = true;
        }
        else {
            buffer.append(cur);
            lastCharacterWasWhitespace = false;
        }
        mNewPositions.push_back(buffer.getLength()-1);
    }
    // strip the last whitespace (if there was one)
    if (lastCharacterWasWhitespace) {
        buffer.truncate(buffer.getLength() - 1);
    }
    mNewPositions.push_back(buffer.getLength());
    mStripped = buffer.makeStringAndClear();
}


sal_Int32
ToxWhitespaceStripper::GetPositionInStrippedString(sal_Int32 pos) const
{
    assert(0 <= pos);
    if (o3tl::make_unsigned(pos) >= mNewPositions.size()) {
        // TODO probably this should assert, not just warn?
        SAL_WARN("sw.core", "Requested position of TOX entry text which does not exist. "
                            "Maybe the formatting hint is corrupt?");
        return mNewPositions.back();
    }
    return mNewPositions.at(pos);
}


}
