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 #include <o3tl/string_view.hxx>
  23 #include <osl/diagnose.h>
  24
  25 namespace svgio::svgreader
  26 {
  27         SvgStyleNode::SvgStyleNode(
  28             SvgDocument& rDocument,
  29             SvgNode* pParent)
  30         :   SvgNode(SVGToken::Style, rDocument, pParent),
  31             mbTextCss(true)
  32         {
  33         }
  34
  35         // #i125258# no parent when we are a CssStyle holder to break potential loops because
  36         // when using CssStyles we jump uncontrolled inside the node tree hierarchy
  37         bool SvgStyleNode::supportsParentStyle() const
  38         {
  39             if(isTextCss())
  40             {
  41                 return false;
  42             }
  43
  44             // call parent
  45             return SvgNode::supportsParentStyle();
  46         }
  47
  48         void SvgStyleNode::parseAttribute(SVGToken aSVGToken, const OUString& aContent)
  49         {
  50             // call parent
  51             SvgNode::parseAttribute(aSVGToken, aContent);
  52
  53             // parse own
  54             switch(aSVGToken)
  55             {
  56                 case SVGToken::Type:
  57                 {
  58                     if(!aContent.isEmpty())
  59                     {
  60                         if(!o3tl::equalsIgnoreAsciiCase(o3tl::trim(aContent), u"text/css"))
  61                         {
  62                             setTextCss(false);
  63                         }
  64                     }
  65                     break;
  66                 }
  67                 default:
  68                 {
  69                     break;
  70                 }
  71             }
  72         }
  73
  74         void SvgStyleNode::addCssStyleSheet(std::u16string_view aSelectors, const SvgStyleAttributes& rNewStyle)
  75         {
  76             // aSelectors: CssStyle selectors, any combination, no comma separations, no spaces at start/end
  77             // rNewStyle: the already prepared style to register on that name
  78             SvgStringVector aSelectorParts;
  79
  80             if(!readSvgStringVector(aSelectors, aSelectorParts, ' '))
  81                 return;
  82
  83             OUStringBuffer aConcatenatedSelector;
  84
  85             // re-combine without spaces, create a unique name (for now)
  86             for(const auto &a : aSelectorParts)
  87             {
  88                 aConcatenatedSelector.append(a);
  89             }
  90
  91             // CssStyles in SVG are currently not completely supported; the current idea for
  92             // supporting the needed minimal set is to register CssStyles associated to a string
  93             // which is just the space-char cleaned, concatenated Selectors. The part to 'match'
  94             // these is in fillCssStyleVectorUsingHierarchyAndSelectors. There, the same string is
  95             // built up using the priorities of local CssStyle, Id, Class and other info combined
  96             // with the existing hierarchy. This creates a specificity and priority-sorted local
  97             // list for each node which is then chained using get/setCssStyle.
  98             // The current solution is capable of solving space-separated selectors which can be
  99             // mixed between Id, Class and type specifiers.
 100             // When CssStyles need more specific solving, the start point is here; remember the
 101             // needed infos not in maIdStyleTokenMapperList at the document, but select evtl.
 102             // more specific infos there in a class capable of handling more complex matchings.
 103             // Additionally fillCssStyleVector (or the mechanism above that when a linked list of
 104             // SvgStyleAttributes will not do it) will have to be adapted to make use of it.
 105
 106             // register new style at document for (evtl. concatenated) stylename
 107             const_cast< SvgDocument& >(getDocument()).addSvgStyleAttributesToMapper(aConcatenatedSelector.makeStringAndClear(), rNewStyle);
 108         }
 109
 110         void SvgStyleNode::addCssStyleSheet(std::u16string_view aSelectors, std::u16string_view aContent)
 111         {
 112             // aSelectors: possible comma-separated list of CssStyle definitions, no spaces at start/end
 113             // aContent: the svg style definitions as string
 114             if(aSelectors.empty() || aContent.empty())
 115                 return;
 116
 117             // comma-separated split (Css abbreviation for same style for multiple selectors)
 118             const sal_Int32 nLen(aSelectors.size());
 119             sal_Int32 nPos(0);
 120             OUStringBuffer aToken;
 121
 122             while(nPos < nLen)
 123             {
 124                 const sal_Int32 nInitPos(nPos);
 125                 copyToLimiter(aSelectors, u',', nPos, aToken, nLen);
 126                 skip_char(aSelectors, u' ', u',', nPos, nLen);
 127
 128                 const OUString aSingleName(o3tl::trim(aToken));
 129                 aToken.setLength(0);
 130
 131                 // add the current css class only if wasn't previously added
 132                 auto [aIterator, bIsNew] = maSvgStyleAttributes.try_emplace(aSingleName);
 133                 if (bIsNew)
 134                 {
 135                     // create new style and add to local list (for ownership control) and
 136                     // in case it's written to again in future classes to prevent overwrites
 137                     aIterator->second = std::make_unique<SvgStyleAttributes>(*this);
 138                 }
 139                 const std::unique_ptr<SvgStyleAttributes>& pCurrentStyle = aIterator->second;
 140
 141                 // fill with content
 142                 pCurrentStyle->readCssStyle(aContent);
 143
 144                 if(aSingleName.getLength())
 145                 {
 146                     addCssStyleSheet(aSingleName, *pCurrentStyle);
 147                 }
 148
 149                 if(nInitPos == nPos)
 150                 {
 151                     OSL_ENSURE(false, "Could not interpret on current position (!)");
 152                     nPos++;
 153                 }
 154             }
 155         }
 156
 157         void SvgStyleNode::addCssStyleSheet(std::u16string_view aSelectorsAndContent)
 158         {
 159             const sal_Int32 nLen(aSelectorsAndContent.size());
 160
 161             if(!nLen)
 162                 return;
 163
 164             sal_Int32 nPos(0);
 165             OUStringBuffer aToken;
 166
 167             while(nPos < nLen)
 168             {
 169                 // read the full selectors (may be multiple, comma-separated)
 170                 const sal_Int32 nInitPos(nPos);
 171                 skip_char(aSelectorsAndContent, u' ', nPos, nLen);
 172                 copyToLimiter(aSelectorsAndContent, u'{', nPos, aToken, nLen);
 173                 skip_char(aSelectorsAndContent, u' ', u'{', nPos, nLen);
 174
 175                 const OUString aSelectors(o3tl::trim(aToken));
 176                 aToken.setLength(0);
 177                 OUString aContent;
 178
 179                 if(!aSelectors.isEmpty() && nPos < nLen)
 180                 {
 181                     // isolate content as text, embraced by '{' and '}'
 182                     copyToLimiter(aSelectorsAndContent, u'}', nPos, aToken, nLen);
 183                     skip_char(aSelectorsAndContent, u' ', u'}', nPos, nLen);
 184
 185                     aContent = o3tl::trim(aToken);
 186                     aToken.setLength(0);
 187                 }
 188
 189                 if(!aSelectors.isEmpty() && !aContent.isEmpty())
 190                 {
 191                     addCssStyleSheet(aSelectors, aContent);
 192                 }
 193
 194                 if(nInitPos == nPos)
 195                 {
 196                     OSL_ENSURE(false, "Could not interpret on current position (!)");
 197                     nPos++;
 198                 }
 199             }
 200         }
 201
 202 } // end of namespace svgio::svgreader
 203
 204 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */