File indexing completed on 2024-04-28 05:50:39

 /*
     SPDX-FileCopyrightText: 2006-2008 Robert Knight <robertknight@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 // Own
 #include "PlainTextDecoder.h"
 
 // Konsole characters
 #include <ExtendedCharTable.h>
 
 // Qt
 #include <QList>
 #include <QTextStream>
 
 using namespace Konsole;
 
 PlainTextDecoder::PlainTextDecoder()
     : _output(nullptr)
     , _includeLeadingWhitespace(true)
     , _includeTrailingWhitespace(true)
     , _recordLinePositions(false)
     , _linePositions(QList<int>())
 {
 }
 
 void PlainTextDecoder::setLeadingWhitespace(bool enable)
 {
     _includeLeadingWhitespace = enable;
 }
 
 void PlainTextDecoder::setTrailingWhitespace(bool enable)
 {
     _includeTrailingWhitespace = enable;
 }
 
 void PlainTextDecoder::begin(QTextStream *output)
 {
     _output = output;
     if (!_linePositions.isEmpty()) {
         _linePositions.clear();
     }
 }
 
 void PlainTextDecoder::end()
 {
     _output = nullptr;
 }
 
 void PlainTextDecoder::setRecordLinePositions(bool record)
 {
     _recordLinePositions = record;
 }
 
 QList<int> PlainTextDecoder::linePositions() const
 {
     return _linePositions;
 }
 
 void PlainTextDecoder::decodeLine(const Character *const characters, int count, LineProperty /*properties*/)
 {
     Q_ASSERT(_output);
 
     if (_recordLinePositions && (_output->string() != nullptr)) {
         int pos = _output->string()->length();
         _linePositions << pos;
     }
 
     // TODO should we ignore or respect the LINE_WRAPPED line property?
 
     // If we should remove leading whitespace find the first non-space character
     int start = 0;
     if (!_includeLeadingWhitespace) {
         while (start < count && characters[start].isSpace()) {
             start++;
         }
     }
 
     int outputCount = count - start;
 
     if (outputCount <= 0) {
         return;
     }
 
     // if inclusion of trailing whitespace is disabled then find the end of the
     // line
     if (!_includeTrailingWhitespace) {
         while (outputCount > 0 && characters[start + outputCount - 1].isSpace()) {
             outputCount--;
         }
     }
 
     // find out the last technically real character in the line
     int realCharacterGuard = -1;
     for (int i = count - 1; i >= start; i--) {
         // FIXME: the special case of '\n' here is really ugly
         // Maybe the '\n' should be added after calling this method in
         // Screen::copyLineToStream()
         if ((characters[i].flags & EF_REAL) != 0 && characters[i].character != '\n') {
             realCharacterGuard = i;
             break;
         }
     }
 
     // note:  we build up a QVector<char32_t> and send it to the text stream transformed into a //
     // QString rather than writing into the text stream a character at a time because it is more
     // efficient (since QTextStream always deals with QStrings internally anyway)
     QVector<char32_t> characterBuffer;
     characterBuffer.reserve(count);
 
     for (int i = start; i < outputCount;) {
         if (characters[i].rendition.f.extended != 0) {
             ushort extendedCharLength = 0;
             const char32_t *chars = ExtendedCharTable::instance.lookupExtendedChar(characters[i].character, extendedCharLength);
             if (chars != nullptr) {
                 for (uint nchar = 0; nchar < extendedCharLength; nchar++) {
                     characterBuffer.append(chars[nchar]);
                 }
                 i += qMax(1, Character::stringWidth(chars, extendedCharLength));
             } else {
                 ++i;
             }
         } else {
             // All characters which appear before the last real character are
             // seen as real characters, even when they are technically marked as
             // non-real.
             //
             // This feels tricky, but otherwise leading "whitespaces" may be
             // lost in some situation. One typical example is copying the result
             // of `dialog --infobox "qwe" 10 10` .
             if ((characters[i].flags & EF_REAL) != 0 || i <= realCharacterGuard) {
                 if (characters[i].isRightHalfOfDoubleWide()) {
                     i += 1;
                 } else {
                     characterBuffer.append(characters[i].character);
                     i += qMax(1, Character::stringWidth(&characters[i].character, 1));
                 }
             } else {
                 ++i; // should we 'break' directly here?
             }
         }
     }
     *_output << QString::fromUcs4(characterBuffer.data(), characterBuffer.size());
 }