WebCore/svg/SVGViewSpec.cpp

   1 /*
   2     Copyright (C) 2007 Rob Buis <buis@kde.org>
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License as published by the Free Software Foundation; either
   7     version 2 of the License, or (at your option) any later version.
   8
   9     This library is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12     Library General Public License for more details.
  13
  14     You should have received a copy of the GNU Library General Public License
  15     along with this library; see the file COPYING.LIB.  If not, write to
  16     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17     Boston, MA 02110-1301, USA.
  18 */
  19
  20 #include "config.h"
  21 #if ENABLE(SVG)
  22 #include "SVGViewSpec.h"
  23
  24 #include "Document.h"
  25 #include "PlatformString.h"
  26 #include "SVGParserUtilities.h"
  27 #include "SVGPreserveAspectRatio.h"
  28 #include "SVGSVGElement.h"
  29 #include "SVGTransformList.h"
  30 #include "SVGTransformable.h"
  31
  32 namespace WebCore {
  33
  34 SVGViewSpec::SVGViewSpec(const SVGSVGElement* contextElement)
  35     : SVGFitToViewBox()
  36     , SVGZoomAndPan()
  37     , m_contextElement(contextElement)
  38     , m_viewBox(this, SVGNames::viewBoxAttr)
  39     , m_preserveAspectRatio(this, SVGNames::preserveAspectRatioAttr, SVGPreserveAspectRatio::create())
  40     , m_transform(SVGTransformList::create(SVGNames::transformAttr))
  41 {
  42 }
  43
  44 SVGViewSpec::~SVGViewSpec()
  45 {
  46 }
  47
  48 void SVGViewSpec::setTransform(const String& transform)
  49 {
  50     SVGTransformable::parseTransformAttribute(m_transform.get(), transform);
  51 }
  52
  53 void SVGViewSpec::setViewBoxString(const String& viewBox)
  54 {
  55     float x, y, w, h;
  56     const UChar* c = viewBox.characters();
  57     const UChar* end = c + viewBox.length();
  58     if (!parseViewBox(m_contextElement->document(), c, end, x, y, w, h, false))
  59         return;
  60     setViewBoxBaseValue(FloatRect(x, y, w, h));
  61 }
  62
  63 void SVGViewSpec::setPreserveAspectRatioString(const String& preserve)
  64 {
  65     const UChar* c = preserve.characters();
  66     const UChar* end = c + preserve.length();
  67     preserveAspectRatioBaseValue()->parsePreserveAspectRatio(c, end);
  68 }
  69
  70 void SVGViewSpec::setViewTargetString(const String& viewTargetString)
  71 {
  72     m_viewTargetString = viewTargetString;
  73 }
  74
  75 SVGElement* SVGViewSpec::viewTarget() const
  76 {
  77     return static_cast<SVGElement*>(m_contextElement->document()->getElementById(m_viewTargetString));
  78 }
  79
  80 static const UChar svgViewSpec[] = {'s', 'v', 'g', 'V', 'i', 'e', 'w'};
  81 static const UChar viewBoxSpec[] = {'v', 'i', 'e', 'w', 'B', 'o', 'x'};
  82 static const UChar preserveAspectRatioSpec[] = {'p', 'r', 'e', 's', 'e', 'r', 'v', 'e', 'A', 's', 'p', 'e', 'c', 't', 'R', 'a', 't', 'i', 'o'};
  83 static const UChar transformSpec[] = {'t', 'r', 'a', 'n', 's', 'f', 'o', 'r', 'm'};
  84 static const UChar zoomAndPanSpec[] = {'z', 'o', 'o', 'm', 'A', 'n', 'd', 'P', 'a', 'n'};
  85 static const UChar viewTargetSpec[] =  {'v', 'i', 'e', 'w', 'T', 'a', 'r', 'g', 'e', 't'};
  86
  87 bool SVGViewSpec::parseViewSpec(const String& viewSpec)
  88 {
  89     const UChar* currViewSpec = viewSpec.characters();
  90     const UChar* end = currViewSpec + viewSpec.length();
  91
  92     if (currViewSpec >= end)
  93         return false;
  94
  95     if (!skipString(currViewSpec, end, svgViewSpec, sizeof(svgViewSpec) / sizeof(UChar)))
  96         return false;
  97
  98     if (currViewSpec >= end || *currViewSpec != '(' )
  99         return false;
 100     currViewSpec++;
 101
 102     while (currViewSpec < end && *currViewSpec != ')') {
 103         if (*currViewSpec == 'v') {
 104             if (skipString(currViewSpec, end, viewBoxSpec, sizeof(viewBoxSpec) / sizeof(UChar))) {
 105                 if (currViewSpec >= end || *currViewSpec != '(')
 106                     return false;
 107                 currViewSpec++;
 108                 float x, y, w, h;
 109                 if (!parseViewBox(m_contextElement->document(), currViewSpec, end, x, y, w, h, false))
 110                     return false;
 111                 setViewBoxBaseValue(FloatRect(x, y, w, h));
 112                 if (currViewSpec >= end || *currViewSpec != ')')
 113                     return false;
 114                 currViewSpec++;
 115             } else if (skipString(currViewSpec, end, viewTargetSpec, sizeof(viewTargetSpec) / sizeof(UChar))) {
 116                 if (currViewSpec >= end || *currViewSpec != '(')
 117                     return false;
 118                 const UChar* viewTargetStart = ++currViewSpec;
 119                 while (currViewSpec < end && *currViewSpec != ')')
 120                     currViewSpec++;
 121                 if (currViewSpec >= end)
 122                     return false;
 123                 setViewTargetString(String(viewTargetStart, currViewSpec - viewTargetStart));
 124                 currViewSpec++;
 125             } else
 126                 return false;
 127         } else if (*currViewSpec == 'z') {
 128             if (!skipString(currViewSpec, end, zoomAndPanSpec, sizeof(zoomAndPanSpec) / sizeof(UChar)))
 129                 return false;
 130             if (currViewSpec >= end || *currViewSpec != '(')
 131                 return false;
 132             currViewSpec++;
 133             if (!parseZoomAndPan(currViewSpec, end))
 134                 return false;
 135             if (currViewSpec >= end || *currViewSpec != ')')
 136                 return false;
 137             currViewSpec++;
 138         } else if (*currViewSpec == 'p') {
 139             if (!skipString(currViewSpec, end, preserveAspectRatioSpec, sizeof(preserveAspectRatioSpec) / sizeof(UChar)))
 140                 return false;
 141             if (currViewSpec >= end || *currViewSpec != '(')
 142                 return false;
 143             currViewSpec++;
 144             if (!preserveAspectRatioBaseValue()->parsePreserveAspectRatio(currViewSpec, end, false))
 145                 return false;
 146             if (currViewSpec >= end || *currViewSpec != ')')
 147                 return false;
 148             currViewSpec++;
 149         } else if (*currViewSpec == 't') {
 150             if (!skipString(currViewSpec, end, transformSpec, sizeof(transformSpec) / sizeof(UChar)))
 151                 return false;
 152             if (currViewSpec >= end || *currViewSpec != '(')
 153                 return false;
 154             currViewSpec++;
 155             SVGTransformable::parseTransformAttribute(m_transform.get(), currViewSpec, end);
 156             if (currViewSpec >= end || *currViewSpec != ')')
 157                 return false;
 158             currViewSpec++;
 159         } else
 160             return false;
 161
 162         if (currViewSpec < end && *currViewSpec == ';')
 163             currViewSpec++;
 164     }
 165
 166     if (currViewSpec >= end || *currViewSpec != ')')
 167         return false;
 168
 169     return true;
 170 }
 171
 172 }
 173
 174 #endif // ENABLE(SVG)