+// Parse and represent CSS border definitions (eg. margin, border-image-width)
+//
+// Copyright (C) 2013 Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+
+#include "CSSBorder.hxx"
+
+#include <boost/lexical_cast.hpp>
+#include <boost/range.hpp>
+#include <boost/tokenizer.hpp>
+
+namespace simgear
+{
+
+ //----------------------------------------------------------------------------
+ bool CSSBorder::isValid() const
+ {
+ return valid;
+ }
+
+ //----------------------------------------------------------------------------
+ bool CSSBorder::isNone() const
+ {
+ return !valid
+ || ( offsets.t == 0
+ && offsets.r == 0
+ && offsets.b == 0
+ && offsets.l == 0 );
+ }
+
+ //----------------------------------------------------------------------------
+ const std::string& CSSBorder::getKeyword() const
+ {
+ return keyword;
+ }
+
+ //----------------------------------------------------------------------------
+ CSSBorder::Offsets CSSBorder::getRelOffsets(const SGRect<int>& dim) const
+ {
+ Offsets ret;
+ for(int i = 0; i < 4; ++i)
+ {
+ ret.val[i] = offsets.val[i];
+ if( !types.rel[i] )
+ ret.val[i] /= (i & 1) ? dim.height() : dim.width();
+ }
+ return ret;
+ }
+
+ //----------------------------------------------------------------------------
+ CSSBorder::Offsets CSSBorder::getAbsOffsets(const SGRect<int>& dim) const
+ {
+ Offsets ret;
+ for(int i = 0; i < 4; ++i)
+ {
+ ret.val[i] = offsets.val[i];
+ if( types.rel[i] )
+ ret.val[i] *= (i & 1) ? dim.height() : dim.width();
+ }
+ return ret;
+ }
+
+ //----------------------------------------------------------------------------
+ CSSBorder CSSBorder::parse(const std::string& str)
+ {
+ if( str.empty() )
+ return CSSBorder();
+
+ // [<number>'%'?]{1,4} (top[,right[,bottom[,left]]])
+ //
+ // Percentages are relative to the size of the image: the width of the
+ // image for the horizontal offsets, the height for vertical offsets.
+ // Numbers represent pixels in the image.
+ int c = 0;
+ CSSBorder ret;
+
+ typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
+ const boost::char_separator<char> del(" \t\n");
+
+ tokenizer tokens(str.begin(), str.end(), del);
+ for( tokenizer::const_iterator tok = tokens.begin();
+ tok != tokens.end() && c < 4;
+ ++tok )
+ {
+ if( isalpha(*tok->begin()) )
+ ret.keyword = *tok;
+ else
+ {
+ bool rel = ret.types.rel[c] = (*tok->rbegin() == '%');
+ ret.offsets.val[c] =
+ // Negative values are not allowed and values bigger than the size of
+ // the image are interpreted as ‘100%’. TODO check max
+ std::max
+ (
+ 0.f,
+ boost::lexical_cast<float>
+ (
+ rel ? boost::make_iterator_range(tok->begin(), tok->end() - 1)
+ : *tok
+ )
+ /
+ (rel ? 100 : 1)
+ );
+ ++c;
+ }
+ }
+
+ // When four values are specified, they set the offsets on the top, right,
+ // bottom and left sides in that order.
+
+#define CSS_COPY_VAL(dest, src)\
+ {\
+ ret.offsets.val[dest] = ret.offsets.val[src];\
+ ret.types.rel[dest] = ret.types.rel[src];\
+ }
+
+ if( c < 4 )
+ {
+ if( c < 3 )
+ {
+ if( c < 2 )
+ // if the right is missing, it is the same as the top.
+ CSS_COPY_VAL(1, 0);
+
+ // if the bottom is missing, it is the same as the top
+ CSS_COPY_VAL(2, 0);
+ }
+
+ // If the left is missing, it is the same as the right
+ CSS_COPY_VAL(3, 1);
+ }
+
+#undef CSS_COPY_VAL
+
+ if( ret.keyword == "none" )
+ {
+ memset(&ret.offsets, 0, sizeof(Offsets));
+ ret.keyword.clear();
+ }
+
+ ret.valid = true;
+ return ret;
+ }
+
+} // namespace simgear
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