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