q3richtext.cpp

奇趣公司比较新的qt/emd版本

        cursor->splitAndInsertEmptyParagraph();
        Q3TextCursor tmp = *cursor;
        tmp.gotoPreviousLetter();
        stylesPar = curpar = tmp.paragraph();
        hasNewPar = true;
        textEditMode = true;
    } else {
        NEWPAR;
    }

    // set rtext spacing to false for the initial paragraph.
    curpar->rtext = false;

    QString wellKnownTags = QLatin1String("br hr wsp table qt body meta title");

    while (pos < length) {
        if (hasPrefix(doc, length, pos, QLatin1Char('<'))){
            if (!hasPrefix(doc, length, pos+1, QLatin1Char('/'))) {
                // open tag
                QMap<QString, QString> attr;
                QMap<QString, QString>::Iterator it, end = attr.end();
                bool emptyTag = false;
                QString tagname = parseOpenTag(doc, length, pos, attr, emptyTag);
                if (tagname.isEmpty())
                    continue; // nothing we could do with this, probably parse error

                const Q3StyleSheetItem* nstyle = sheet_->item(tagname);

                if (nstyle) {
                    // we might have to close some 'forgotten' tags
                    while (!nstyle->allowedInContext(curtag.style)) {
                        QString msg;
                        msg.sprintf("QText Warning: Document not valid ('%s' not allowed in '%s' #%d)",
                                     tagname.ascii(), curtag.style->name().ascii(), pos);
                        sheet_->error(msg);
                        if (tags.isEmpty())
                            break;
                        curtag = tags.pop();
                    }

                    /* special handling for p and li for HTML
                       compatibility. We do not want to embed blocks in
                       p, and we do not want new blocks inside non-empty
                       lis. Plus we want to merge empty lis sometimes. */
                    if(nstyle->displayMode() == Q3StyleSheetItem::DisplayListItem) {
                        canMergeLi = true;
                    } else if (nstyle->displayMode() == Q3StyleSheetItem::DisplayBlock) {
                        while (curtag.style->name() == QLatin1String("p")) {
                            if (tags.isEmpty())
                                break;
                            curtag = tags.pop();
                        }

                        if (curtag.style->displayMode() == Q3StyleSheetItem::DisplayListItem) {
                            // we are in a li and a new block comes along
                            if (nstyle->name() == QString(QLatin1String("ul")) || nstyle->name() == QLatin1String("ol"))
                                hasNewPar = false; // we want an empty li (like most browsers)
                            if (!hasNewPar) {
                                /* do not add new blocks inside
                                   non-empty lis */
                                while (curtag.style->displayMode() == Q3StyleSheetItem::DisplayListItem) {
                                    if (tags.isEmpty())
                                        break;
                                    curtag = tags.pop();
                                }
                            } else if (canMergeLi) {
                                /* we have an empty li and a block
                                   comes along, merge them */
                                nstyle = curtag.style;
                            }
                            canMergeLi = false;
                        }
                    }
                }

#ifndef QT_NO_TEXTCUSTOMITEM
                Q3TextCustomItem* custom =  0;
#else
                bool custom = false;
#endif

                // some well-known tags, some have a nstyle, some not
                if (wellKnownTags.contains(tagname)) {
                    if (tagname == QLatin1String("br")) {
                        emptyTag = space = true;
                        int index = qMax(curpar->length(),1) - 1;
                        Q3TextFormat format = curtag.format.makeTextFormat(nstyle, attr, scaleFontsFactor);
                        curpar->append(QString(QChar(QChar::LineSeparator)));
                        curpar->setFormat(index, 1, &format);
                        hasNewPar = false;
                    }  else if (tagname == QLatin1String("hr")) {
                        emptyTag = space = true;
#ifndef QT_NO_TEXTCUSTOMITEM
                        custom = tag(sheet_, tagname, attr, contxt, *factory_ , emptyTag, this);
#endif
                    } else if (tagname == QLatin1String("table")) {
                        emptyTag = space = true;
#ifndef QT_NO_TEXTCUSTOMITEM
                        Q3TextFormat format = curtag.format.makeTextFormat( nstyle, attr, scaleFontsFactor);
                        curpar->setAlignment(curtag.alignment);
                        custom = parseTable(attr, format, doc, length, pos, curpar);
#endif
                    } else if (tagname == QLatin1String("qt") || tagname == QLatin1String("body")) {
                        it = attr.find(QLatin1String("bgcolor"));
                        if (it != end) {
                            QBrush *b = new QBrush(QColor(*it));
                            setPaper(b);
                        }
                        it = attr.find(QLatin1String("background"));
                        if (it != end) {
#ifndef QT_NO_MIME
                            QImage img;
                            QString bg = *it;
                            const QMimeSource* m = factory_->data(bg, contxt);
                            if (!m) {
                                qCritical("QRichText: no mimesource for %s",
                                          QFile::encodeName(bg).data());
                            } else {
                                if (!Q3ImageDrag::decode(m, img)) {
                                    qCritical("Q3TextImage: cannot decode %s",
                                              QFile::encodeName(bg).data());
                                }
                            }
                            if (!img.isNull()) {
                                QBrush *b = new QBrush(QColor(), QPixmap(img));
                                setPaper(b);
                            }
#endif
                        }
                        it = attr.find(QLatin1String("text"));
                        if (it != end) {
                            QColor c(*it);
                            initag.format.setColor(c);
                            curtag.format.setColor(c);
                            bodyText = c;
                        }
                        it = attr.find(QLatin1String("link"));
                        if (it != end)
                            linkColor = QColor(*it);
                        it = attr.find(QLatin1String("title"));
                        if (it != end)
                            attribs.insert(QLatin1String("title"), *it);

                        if (textEditMode) {
                            it = attr.find(QLatin1String("style"));
                            if (it != end) {
                                QString a = *it;
                                int count = a.count(QLatin1Char(';')) + 1;
                                for (int s = 0; s < count; s++) {
                                    QString style = a.section(QLatin1Char(';'), s, s);
                                    if (style.startsWith(QLatin1String("font-size:")) && style.endsWith(QLatin1String("pt"))) {
                                        scaleFontsFactor = double(formatCollection()->defaultFormat()->fn.pointSize()) /
                                                           style.mid(10, style.length() - 12).toInt();
                                    }
                                }
                            }
                            nstyle = 0; // ignore body in textEditMode
                        }
                        // end qt- and body-tag handling
                    } else if (tagname == QLatin1String("meta")) {
                        if (attr[QLatin1String("name")] == QLatin1String("qrichtext") && attr[QLatin1String("content")] == QLatin1String("1"))
                            textEditMode = true;
                    } else if (tagname == QLatin1String("title")) {
                        QString title;
                        while (pos < length) {
                            if (hasPrefix(doc, length, pos, QLatin1Char('<')) && hasPrefix(doc, length, pos+1, QLatin1Char('/')) &&
                                 parseCloseTag(doc, length, pos) == QLatin1String("title"))
                                break;
                            title += doc[pos];
                            ++pos;
                        }
                        attribs.insert(QLatin1String("title"), title);
                    }
                } // end of well-known tag handling

#ifndef QT_NO_TEXTCUSTOMITEM
                if (!custom) // try generic custom item
                    custom = tag(sheet_, tagname, attr, contxt, *factory_ , emptyTag, this);
#endif
                if (!nstyle && !custom) // we have no clue what this tag could be, ignore it
                    continue;

                if (custom) {
#ifndef QT_NO_TEXTCUSTOMITEM
                    int index = qMax(curpar->length(),1) - 1;
                    Q3TextFormat format = curtag.format.makeTextFormat(nstyle, attr, scaleFontsFactor);
                    curpar->append(QString(QLatin1Char('*')));
                    Q3TextFormat* f = formatCollection()->format(&format);
                    curpar->setFormat(index, 1, f);
                    curpar->at(index)->setCustomItem(custom);
                    if (!curtag.anchorHref.isEmpty())
                        curpar->at(index)->setAnchor(QString(), curtag.anchorHref);
                    if (!anchorName.isEmpty() ) {
                        curpar->at(index)->setAnchor(anchorName, curpar->at(index)->anchorHref());
                        anchorName.clear();
                    }
                    registerCustomItem(custom, curpar);
                    hasNewPar = false;
#endif
                } else if (!emptyTag) {
                    /* if we do nesting, push curtag on the stack,
                       otherwise reinint curag. */
                    if (curtag.style->name() != tagname || nstyle->selfNesting()) {
                        tags.push(curtag);
                    } else {
                        if (!tags.isEmpty())
                            curtag = tags.top();
                        else
                            curtag = initag;
                    }

                    curtag.name = tagname;
                    curtag.style = nstyle;
                    curtag.name = tagname;
                    curtag.style = nstyle;
                    if (nstyle->whiteSpaceMode()  != Q3StyleSheetItem::WhiteSpaceModeUndefined)
                        curtag.wsm = nstyle->whiteSpaceMode();

                    /* netscape compatibility: eat a newline and only a newline if a pre block starts */
                    if (curtag.wsm == Q3StyleSheetItem::WhiteSpacePre &&
                         nstyle->displayMode() == Q3StyleSheetItem::DisplayBlock)
                        eat(doc, length, pos, QLatin1Char('\n'));

                    /* ignore whitespace for inline elements if there
                       was already one*/
                    if (!textEditMode &&
                         (curtag.wsm == Q3StyleSheetItem::WhiteSpaceNormal
                          || curtag.wsm == Q3StyleSheetItem::WhiteSpaceNoWrap)
                         && (space || nstyle->displayMode() != Q3StyleSheetItem::DisplayInline))
                        eatSpace(doc, length, pos);

                    curtag.format = curtag.format.makeTextFormat(nstyle, attr, scaleFontsFactor);
                    if (nstyle->isAnchor()) {
                        if (!anchorName.isEmpty())
                            anchorName += QLatin1String("#") + attr[QLatin1String("name")];
                        else
                            anchorName = attr[QLatin1String("name")];
                        curtag.anchorHref = attr[QLatin1String("href")];
                    }

                    if (nstyle->alignment() != Q3StyleSheetItem::Undefined)
                        curtag.alignment = nstyle->alignment();

                    if (nstyle->listStyle() != Q3StyleSheetItem::ListStyleUndefined)
                        curtag.liststyle = nstyle->listStyle();

                    if (nstyle->displayMode() == Q3StyleSheetItem::DisplayBlock
                         || nstyle->displayMode() == Q3StyleSheetItem::DisplayListItem) {

                        if (nstyle->name() == QLatin1String("ol") ||
                            nstyle->name() == QLatin1String("ul") ||
                            nstyle->name() == QLatin1String("li")) {
                            QString type = attr[QLatin1String("type")];
                            if (!type.isEmpty()) {
                                if (type == QLatin1String("1")) {
                                    curtag.liststyle = Q3StyleSheetItem::ListDecimal;
                                } else if (type == QLatin1String("a")) {
                                    curtag.liststyle = Q3StyleSheetItem::ListLowerAlpha;
                                } else if (type == QLatin1String("A")) {
                                    curtag.liststyle = Q3StyleSheetItem::ListUpperAlpha;
                                } else {
                                    type = type.toLower();
                                    if (type == QLatin1String("square"))
                                        curtag.liststyle = Q3StyleSheetItem::ListSquare;
                                    else if (type == QLatin1String("disc"))
                                        curtag.liststyle = Q3StyleSheetItem::ListDisc;
                                    else if (type == QLatin1String("circle"))
                                        curtag.liststyle = Q3StyleSheetItem::ListCircle;
                                }
                            }
                        }


                        /* Internally we treat ordered and bullet
                          lists the same for margin calculations. In
                          order to have fast pointer compares in the
                          xMargin() functions we restrict ourselves to
                          <ol>. Once we calculate the margins in the
                          parser rathern than later, the unelegance of
                          this approach goes awy
                         */
                        if (nstyle->name() == QLatin1String("ul"))
                            curtag.style = sheet_->item(QLatin1String("ol"));

                        it = attr.find(QLatin1String("align"));
                        if (it != end) {
                            QString align = (*it).toLower();
                            if (align == QLatin1String("center"))
                                curtag.alignment = Qt::AlignCenter;
                            else if (align == QLatin1String("right"))
                                curtag.alignment = Qt::AlignRight;
                            else if (align == QLatin1String("justify"))
                                curtag.alignment = Qt::AlignJustify;
                        }
                        it = attr.find(QLatin1String("dir"));
                        if (it != end) {
                            QString dir = (*it).toLower();
                            if (dir == QLatin1String("rtl"))
                                curtag.direction = QChar::DirR;
                            else if (dir == QLatin1String("ltr"))
                                curtag.direction = QChar::DirL;
                        }

                        NEWPAR;

                        if (curtag.style && curtag.style->displayMode() == Q3StyleSheetItem::DisplayListItem) {
                            it = attr.find(QLatin1String("value"));
                            if (it != end)
                                curpar->setListValue((*it).toInt());
                        }

                        it = attr.find(QLatin1String("style"));
                        if (it != end) {
                            QString a = *it;
                            bool ok = true;
                            int count = a.count(QLatin1Char(';'))+1;
                            for (int s = 0; ok && s < count; s++) {
                                QString style = a.section(QLatin1Char(';'), s, s);
                                if (style.startsWith(QLatin1String("margin-top:")) && style.endsWith(QLatin1String("px")))
                                    curpar->utm = 1+style.mid(11, style.length() - 13).toInt(&ok);
                                else if (style.startsWith(QLatin1String("margin-bottom:")) && style.endsWith(QLatin1String("px")))
                                    curpar->ubm = 1+style.mid(14, style.length() - 16).toInt(&ok);
                                else if (style.startsWith(QLatin1String("margin-left:")) && style.endsWith(QLatin1String("px")))
                                    curpar->ulm = 1+style.mid(12, style.length() - 14).toInt(&ok);
                                else if (style.startsWith(QLatin1String("margin-right:")) && style.endsWith(QLatin1String("px")))
                                    curpar->urm = 1+style.mid(13, style.length() - 15).toInt(&ok);
                                else if (style.startsWith(QLatin1String("text-indent:")) && style.endsWith(QLatin1String("px")))
                                    curpar->uflm = 1+style.mid(12, style.length() - 14).toInt(&ok);
                            }
                            if (!ok) // be pressmistic
                                curpar->utm = curpar->ubm = curpar->urm = curpar->ulm = 0;
                        }
                    }
                }
            } else {
                QString tagname = parseCloseTag(doc, length, pos);
                if (tagname.isEmpty())
                    continue; // nothing we could do with this, probably parse error
                if (!sheet_->item(tagname)) // ignore unknown tags
                    continue;
                if (tagname == QLatin1String("li"))
                    continue;

                // we close a block item. Since the text may continue, we need to have a new paragraph
                bool needNewPar = curtag.style->displayMode() == Q3StyleSheetItem::DisplayBlock
                                 || curtag.style->displayMode() == Q3StyleSheetItem::DisplayListItem;


                // html slopiness: handle unbalanched tag closing
                while (curtag.name != tagname) {
                    QString msg;
                    msg.sprintf("QText Warning: Document not valid ('%s' not closed before '%s' #%d)",
                                 curtag.name.ascii(), tagname.ascii(), pos);
                    sheet_->error(msg);
                    if (tags.isEmpty())
                        break;
                    curtag = tags.pop();
                }


                // close the tag
                if (!tags.isEmpty())
                    curtag = tags.pop();
                else
                    curtag = initag;

                if (needNewPar) {
                    if (textEditMode && (tagname == QLatin1String("p") || tagname == QLatin1String("div"))) // preserve empty paragraphs
                        hasNewPar = false;
                    NEWPAR;
                }
            }
        } else {
            // normal contents
            QString s;
            QChar c;
            while (pos < length && !hasPrefix(doc, length, pos, QLatin1Char('<'))){
                if (textEditMode) {
                    // text edit mode: we handle all white space but ignore newlines
                    c = parseChar(doc, length, pos, Q3StyleSheetItem::WhiteSpacePre);
                    if (c == QChar::LineSeparator)
                        break;
                } else {
                    int l = pos;
                    c = parseChar(doc, length, pos, curtag.wsm);

                    // in white space pre mode: treat any space as non breakable
                    // and expand tabs to eight character wide columns.
                    if (curtag.wsm == Q3StyleSheetItem::WhiteSpacePre) {
                        if  (c == QLatin1Char('\t')) {
                            c = QLatin1Char(' ');
                            while((++tabExpansionColumn)%8)
                                s += c;
                        }
                        if (c == QChar::LineSeparator)
                            tabExpansionColumn = 0;
                        else
                            tabExpansionColumn++;

                    }
                    if (c == QLatin1Char(' ') || c == QChar::LineSeparator)