xref: /aoo42x/main/svgio/source/svgreader/svgstylenode.cxx (revision 52cb04b8)

/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_svgio.hxx"

#include <svgio/svgreader/svgstylenode.hxx>
#include <svgio/svgreader/svgdocument.hxx>

//////////////////////////////////////////////////////////////////////////////

namespace svgio
{
    namespace svgreader
    {
        SvgStyleNode::SvgStyleNode(
            SvgDocument& rDocument,
            SvgNode* pParent)
        :   SvgNode(SVGTokenStyle, rDocument, pParent),
            maSvgStyleAttributes(),
            mbTextCss(false)
        {
        }

        SvgStyleNode::~SvgStyleNode()
        {
            while(!maSvgStyleAttributes.empty())
            {
                delete *(maSvgStyleAttributes.end() - 1);
                maSvgStyleAttributes.pop_back();
            }
        }

        // #125258# no parent when we are a CssStyle holder to break potential loops because
        // when using CssStyles we jump uncontrolled inside the node tree hierarchy
        bool SvgStyleNode::supportsParentStyle() const
        {
            if(isTextCss())
            {
                return false;
            }

            // call parent
            return SvgNode::supportsParentStyle();
        }

        void SvgStyleNode::parseAttribute(const rtl::OUString& rTokenName, SVGToken aSVGToken, const rtl::OUString& aContent)
        {
            // call parent
            SvgNode::parseAttribute(rTokenName, aSVGToken, aContent);

            // parse own
            switch(aSVGToken)
            {
                case SVGTokenType:
                {
                    if(aContent.getLength())
                    {
                        static rtl::OUString aStrTextCss(rtl::OUString::createFromAscii("text/css"));

                        if(aContent.match(aStrTextCss))
                        {
                            setTextCss(true);
                        }
                    }
                    break;
                }
                default:
                {
                    break;
                }
            }
        }

        void SvgStyleNode::addCssStyleSheet(const rtl::OUString& aSelectors, const SvgStyleAttributes& rNewStyle)
        {
            // aSelectors: CssStyle selectors, any combination, no comma separations, no spaces at start/end
            // rNewStyle: the already preapared style to register on that name
            if(aSelectors.getLength())
            {
                std::vector< rtl::OUString > aSelectorParts;
                const sal_Int32 nLen(aSelectors.getLength());
                sal_Int32 nPos(0);
                rtl::OUStringBuffer aToken;

                // split into single tokens (currently only space separator)
                while(nPos < nLen)
                {
                    const sal_Int32 nInitPos(nPos);
                    copyToLimiter(aSelectors, sal_Unicode(' '), nPos, aToken, nLen);
                    skip_char(aSelectors, sal_Unicode(' '), nPos, nLen);
                    const rtl::OUString aSelectorPart(aToken.makeStringAndClear().trim());

                    if(aSelectorPart.getLength())
                    {
                        aSelectorParts.push_back(aSelectorPart);
                    }

                    if(nInitPos == nPos)
                    {
                        OSL_ENSURE(false, "Could not interpret on current position (!)");
                        nPos++;
                    }
                }

                if(aSelectorParts.size())
                {
                    rtl::OUString aConcatenatedSelector;

                    // re-combine without spaces, create a unique name (for now)
                    for(sal_uInt32 a(0); a < aSelectorParts.size(); a++)
                    {
                        aConcatenatedSelector += aSelectorParts[a];
                    }

                    // CssStyles in SVG are currently not completely supported; the current idea for
                    // supporting the needed minimal set is to register CssStyles associated to a string
                    // which is just the space-char cleaned, concatenated Selectors. The part to 'match'
                    // these is in fillCssStyleVectorUsingHierarchyAndSelectors. There, the same string is
                    // built up using the priorities of local CssStyle, Id, Class and other info combined
                    // with the existing hierarchy. This creates a specificity- and priority-sorted local
                    // list for each node which is then chained using get/setCssStyleParent.
                    // The current solution is capable of solving space-separated selectors which can be
                    // mixed between Id, Class and type specifiers.
                    // When CssStyles need more specific solving, the start point is here; remember the
                    // needed infos not in maIdStyleTokenMapperList at the document, but select evtl.
                    // more specific infos there in a class capable of handling more complex matchings.
                    // Additionally fillCssStyleVector (or the mechanism above that when a linked list of
                    // SvgStyleAttributes will not do it) will have to be adapted to make use of it.

                    // register new style at document for (evtl. concatenated) stylename
                    const_cast< SvgDocument& >(getDocument()).addSvgStyleAttributesToMapper(aConcatenatedSelector, rNewStyle);
                }
            }
        }

        void SvgStyleNode::addCssStyleSheet(const rtl::OUString& aSelectors, const rtl::OUString& aContent)
        {
            // aSelectors: possible comma-separated list of CssStyle definitions, no spaces at start/end
            // aContent: the svg style definitions as string
            if(aSelectors.getLength() && aContent.getLength())
            {
                // create new style and add to local list (for ownership control)
                SvgStyleAttributes* pNewStyle = new SvgStyleAttributes(*this);
                maSvgStyleAttributes.push_back(pNewStyle);

                // fill with content
                pNewStyle->readCssStyle(aContent);

                // comma-separated split (Css abbreviation for same style for multiple selectors)
                const sal_Int32 nLen(aSelectors.getLength());
                sal_Int32 nPos(0);
                rtl::OUStringBuffer aToken;

                while(nPos < nLen)
                {
                    const sal_Int32 nInitPos(nPos);
                    copyToLimiter(aSelectors, sal_Unicode(','), nPos, aToken, nLen);
                    skip_char(aSelectors, sal_Unicode(' '), sal_Unicode(','), nPos, nLen);

                    const rtl::OUString aSingleName(aToken.makeStringAndClear().trim());

                    if(aSingleName.getLength())
                    {
                        addCssStyleSheet(aSingleName, *pNewStyle);
                    }

                    if(nInitPos == nPos)
                    {
                        OSL_ENSURE(false, "Could not interpret on current position (!)");
                        nPos++;
                    }
                }
            }
        }

        void SvgStyleNode::addCssStyleSheet(const rtl::OUString& aSelectorsAndContent)
        {
            const sal_Int32 nLen(aSelectorsAndContent.getLength());

            if(nLen)
            {
                sal_Int32 nPos(0);
                rtl::OUStringBuffer aToken;

                while(nPos < nLen)
                {
                    // read the full selectors (may be multiple, comma-separated)
                    const sal_Int32 nInitPos(nPos);
                    skip_char(aSelectorsAndContent, sal_Unicode(' '), nPos, nLen);
                    copyToLimiter(aSelectorsAndContent, sal_Unicode('{'), nPos, aToken, nLen);
                    skip_char(aSelectorsAndContent, sal_Unicode(' '), sal_Unicode('{'), nPos, nLen);

                    const rtl::OUString aSelectors(aToken.makeStringAndClear().trim());
                    rtl::OUString aContent;

                    if(aSelectors.getLength() && nPos < nLen)
                    {
                        // isolate content as text, embraced by '{' and '}'
                        copyToLimiter(aSelectorsAndContent, sal_Unicode('}'), nPos, aToken, nLen);
                        skip_char(aSelectorsAndContent, sal_Unicode(' '), sal_Unicode('}'), nPos, nLen);

                        aContent = aToken.makeStringAndClear().trim();
                    }

                    if(aSelectors.getLength() && aContent.getLength())
                    {
                        addCssStyleSheet(aSelectors, aContent);
                    }

                    if(nInitPos == nPos)
                    {
                        OSL_ENSURE(false, "Could not interpret on current position (!)");
                        nPos++;
                    }
                }
            }
        }

    } // end of namespace svgreader
} // end of namespace svgio

//////////////////////////////////////////////////////////////////////////////
// eof