svgio/source/svgreader/svgstylenode.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <svgstylenode.hxx>
  21 #include <svgdocument.hxx>
  22
  23 namespace svgio::svgreader
  24 {
  25         SvgStyleNode::SvgStyleNode(
  26             SvgDocument& rDocument,
  27             SvgNode* pParent)
  28         :   SvgNode(SVGTokenStyle, rDocument, pParent),
  29             maSvgStyleAttributes(),
  30             mbTextCss(false)
  31         {
  32         }
  33
  34         SvgStyleNode::~SvgStyleNode()
  35         {
  36             while(!maSvgStyleAttributes.empty())
  37             {
  38                 delete *(maSvgStyleAttributes.end() - 1);
  39                 maSvgStyleAttributes.pop_back();
  40             }
  41         }
  42
  43         // #i125258# no parent when we are a CssStyle holder to break potential loops because
  44         // when using CssStyles we jump uncontrolled inside the node tree hierarchy
  45         bool SvgStyleNode::supportsParentStyle() const
  46         {
  47             if(isTextCss())
  48             {
  49                 return false;
  50             }
  51
  52             // call parent
  53             return SvgNode::supportsParentStyle();
  54         }
  55
  56         void SvgStyleNode::parseAttribute(const OUString& rTokenName, SVGToken aSVGToken, const OUString& aContent)
  57         {
  58             // call parent
  59             SvgNode::parseAttribute(rTokenName, aSVGToken, aContent);
  60
  61             // parse own
  62             switch(aSVGToken)
  63             {
  64                 case SVGTokenType:
  65                 {
  66                     if(!aContent.isEmpty())
  67                     {
  68                         if(aContent.startsWith("text/css"))
  69                         {
  70                             setTextCss(true);
  71                         }
  72                     }
  73                     break;
  74                 }
  75                 default:
  76                 {
  77                     break;
  78                 }
  79             }
  80         }
  81
  82         void SvgStyleNode::addCssStyleSheet(const OUString& aSelectors, const SvgStyleAttributes& rNewStyle)
  83         {
  84             // aSelectors: CssStyle selectors, any combination, no comma separations, no spaces at start/end
  85             // rNewStyle: the already prepared style to register on that name
  86             if(aSelectors.isEmpty())
  87                 return;
  88
  89             std::vector< OUString > aSelectorParts;
  90             const sal_Int32 nLen(aSelectors.getLength());
  91             sal_Int32 nPos(0);
  92             OUStringBuffer aToken;
  93
  94             // split into single tokens (currently only space separator)
  95             while(nPos < nLen)
  96             {
  97                 const sal_Int32 nInitPos(nPos);
  98                 copyToLimiter(aSelectors, u' ', nPos, aToken, nLen);
  99                 skip_char(aSelectors, u' ', nPos, nLen);
 100                 const OUString aSelectorPart(aToken.makeStringAndClear().trim());
 101
 102                 if(!aSelectorPart.isEmpty())
 103                 {
 104                     aSelectorParts.push_back(aSelectorPart);
 105                 }
 106
 107                 if(nInitPos == nPos)
 108                 {
 109                     OSL_ENSURE(false, "Could not interpret on current position (!)");
 110                     nPos++;
 111                 }
 112             }
 113
 114             if(aSelectorParts.empty())
 115                 return;
 116
 117             OUStringBuffer aConcatenatedSelector;
 118
 119             // re-combine without spaces, create a unique name (for now)
 120             for(size_t a(0); a < aSelectorParts.size(); a++)
 121             {
 122                 aConcatenatedSelector.append(aSelectorParts[a]);
 123             }
 124
 125             // CssStyles in SVG are currently not completely supported; the current idea for
 126             // supporting the needed minimal set is to register CssStyles associated to a string
 127             // which is just the space-char cleaned, concatenated Selectors. The part to 'match'
 128             // these is in fillCssStyleVectorUsingHierarchyAndSelectors. There, the same string is
 129             // built up using the priorities of local CssStyle, Id, Class and other info combined
 130             // with the existing hierarchy. This creates a specificity and priority-sorted local
 131             // list for each node which is then chained using get/setCssStyleParent.
 132             // The current solution is capable of solving space-separated selectors which can be
 133             // mixed between Id, Class and type specifiers.
 134             // When CssStyles need more specific solving, the start point is here; remember the
 135             // needed infos not in maIdStyleTokenMapperList at the document, but select evtl.
 136             // more specific infos there in a class capable of handling more complex matchings.
 137             // Additionally fillCssStyleVector (or the mechanism above that when a linked list of
 138             // SvgStyleAttributes will not do it) will have to be adapted to make use of it.
 139
 140             // register new style at document for (evtl. concatenated) stylename
 141             const_cast< SvgDocument& >(getDocument()).addSvgStyleAttributesToMapper(aConcatenatedSelector.makeStringAndClear(), rNewStyle);
 142         }
 143
 144         void SvgStyleNode::addCssStyleSheet(const OUString& aSelectors, const OUString& aContent)
 145         {
 146             // aSelectors: possible comma-separated list of CssStyle definitions, no spaces at start/end
 147             // aContent: the svg style definitions as string
 148             if(aSelectors.isEmpty() || aContent.isEmpty())
 149                 return;
 150
 151             // create new style and add to local list (for ownership control)
 152             SvgStyleAttributes* pNewStyle = new SvgStyleAttributes(*this);
 153             maSvgStyleAttributes.push_back(pNewStyle);
 154
 155             // fill with content
 156             pNewStyle->readCssStyle(aContent);
 157
 158             // comma-separated split (Css abbreviation for same style for multiple selectors)
 159             const sal_Int32 nLen(aSelectors.getLength());
 160             sal_Int32 nPos(0);
 161             OUStringBuffer aToken;
 162
 163             while(nPos < nLen)
 164             {
 165                 const sal_Int32 nInitPos(nPos);
 166                 copyToLimiter(aSelectors, u',', nPos, aToken, nLen);
 167                 skip_char(aSelectors, u' ', u',', nPos, nLen);
 168
 169                 const OUString aSingleName(aToken.makeStringAndClear().trim());
 170
 171                 if(aSingleName.getLength())
 172                 {
 173                     addCssStyleSheet(aSingleName, *pNewStyle);
 174                 }
 175
 176                 if(nInitPos == nPos)
 177                 {
 178                     OSL_ENSURE(false, "Could not interpret on current position (!)");
 179                     nPos++;
 180                 }
 181             }
 182         }
 183
 184         void SvgStyleNode::addCssStyleSheet(const OUString& aSelectorsAndContent)
 185         {
 186             const sal_Int32 nLen(aSelectorsAndContent.getLength());
 187
 188             if(!nLen)
 189                 return;
 190
 191             sal_Int32 nPos(0);
 192             OUStringBuffer aToken;
 193
 194             while(nPos < nLen)
 195             {
 196                 // read the full selectors (may be multiple, comma-separated)
 197                 const sal_Int32 nInitPos(nPos);
 198                 skip_char(aSelectorsAndContent, u' ', nPos, nLen);
 199                 copyToLimiter(aSelectorsAndContent, u'{', nPos, aToken, nLen);
 200                 skip_char(aSelectorsAndContent, u' ', u'{', nPos, nLen);
 201
 202                 const OUString aSelectors(aToken.makeStringAndClear().trim());
 203                 OUString aContent;
 204
 205                 if(!aSelectors.isEmpty() && nPos < nLen)
 206                 {
 207                     // isolate content as text, embraced by '{' and '}'
 208                     copyToLimiter(aSelectorsAndContent, u'}', nPos, aToken, nLen);
 209                     skip_char(aSelectorsAndContent, u' ', u'}', nPos, nLen);
 210
 211                     aContent = aToken.makeStringAndClear().trim();
 212                 }
 213
 214                 if(!aSelectors.isEmpty() && !aContent.isEmpty())
 215                 {
 216                     addCssStyleSheet(aSelectors, aContent);
 217                 }
 218
 219                 if(nInitPos == nPos)
 220                 {
 221                     OSL_ENSURE(false, "Could not interpret on current position (!)");
 222                     nPos++;
 223                 }
 224             }
 225         }
 226
 227 } // end of namespace svgio::svgreader
 228
 229 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */