object MathML.MathMLVisitor.Visit(MathMLPresentationToken e, object args)
{
Area area = null;
// make an updated context
IFormattingContext context = ((IFormattingContext)args).Clone();
XmlNode node = null;
MathMLElement element = null;
MathMLNodeList contents = e.Contents;
// update the font size, pres-tokens can specify font size
context.Size = context.Evaluate(e.MathSize);
MathVariant variant = e.MathVariant;
if (variant != MathVariant.Unknown)
{
context.MathVariant = variant;
}
if (contents.Count == 1) // create a single string area
{
if ((node = e.FirstChild) != null && node.NodeType == XmlNodeType.Text)
{
area = AreaFactory.String(context, node.Value);
}
else if ((element = e.FirstChild as MathMLElement) != null)
{
// sets area to a new glyph area
area = (Area)element.Accept(formatter, context);
}
else
{
// TODO this is bad, need error handler
}
}
else // create a sequence of areas
{
Area[] areas = new Area[contents.Count];
int i = 0;
foreach (XmlNode n in contents)
{
if (n.NodeType == XmlNodeType.Text)
{
area = AreaFactory.String(context, n.Value);
}
else if ((element = n as MathMLElement) != null)
{
area = (Area)element.Accept(formatter, context);
}
areas[i++] = area;
}
area = AreaFactory.Horizontal(areas);
}
return(area.BoundingBox);
}
object MathML.MathMLVisitor.Visit(MathMLPresentationToken e, object args)
{
Area area = null;
// make an updated context
IFormattingContext context = ((IFormattingContext)args).Clone();
XmlNode node = null;
MathMLElement element = null;
MathMLNodeList contents = e.Contents;
// update the font size, pres-tokens can specify font size
context.Size = context.Evaluate(e.MathSize);
MathVariant variant = e.MathVariant;
if(variant != MathVariant.Unknown)
{
context.MathVariant = variant;
}
if(contents.Count == 1) // create a single string area
{
if((node = e.FirstChild) != null && node.NodeType == XmlNodeType.Text)
{
area = AreaFactory.String(context, node.Value);
}
else if((element = e.FirstChild as MathMLElement) != null)
{
// sets area to a new glyph area
area = (Area)element.Accept(formatter, context);
}
else
{
// TODO this is bad, need error handler
}
}
else // create a sequence of areas
{
Area[] areas = new Area[contents.Count];
int i = 0;
foreach(XmlNode n in contents)
{
if(n.NodeType == XmlNodeType.Text)
{
area = AreaFactory.String(context, n.Value);
}
else if((element = n as MathMLElement) != null)
{
area = (Area)element.Accept(formatter, context);
}
areas[i++] = area;
}
area = AreaFactory.Horizontal(areas);
}
return area.BoundingBox;
}
object MathML.MathMLVisitor.Visit(MathMLPresentationToken e, object args)
{
MathMLElement p = null;
switch (selection)
{
case SelectionType.Prev:
{
if (index > 1)
{
index--;
return(e);
}
else if (index == 1)
{
if ((e.ParentNode is MathMLPresentationContainer && !(PreviousMathSibling(e) is MathMLPresentationToken)) ||
(!(e.ParentNode is MathMLPresentationContainer)))
{
index--;
return(e);
}
else
{
return(((MathMLElement)e.ParentNode).Accept(this, e));
}
}
else if (e.ParentNode is MathMLPresentationContainer && (p = PreviousMathSibling(e) as MathMLPresentationToken) != null)
{
selection = SelectionType.End;
return(p.Accept(this, null));
}
else
{
return(((MathMLElement)e.ParentNode).Accept(this, e));
}
}
case SelectionType.Next:
{
if (e.ChildNodes.Count == 1 && e.FirstChild.NodeType == XmlNodeType.Text && index < e.FirstChild.Value.Length)
{
index++;
return(e);
}
else if ((e.ParentNode is MathMLPresentationContainer || e.ParentNode is MathMLMathElement) &&
(p = NextMathSibling(e) as MathMLPresentationToken) != null)
{
selection = SelectionType.Start;
index = 0;
return(p.Accept(this, null));
}
else
{
return(((MathMLElement)e.ParentNode).Accept(this, e));
}
}
case SelectionType.End:
{
index = e.FirstChild.Value.Length;
return(e);
}
case SelectionType.Start:
default:
{
if (((e.ParentNode is MathMLPresentationContainer || e.ParentNode is MathMLMathElement) &&
!(PreviousMathSibling(e) is MathMLPresentationToken)) ||
(!(e.ParentNode is MathMLPresentationContainer || e.ParentNode is MathMLMathElement)))
{
index = 0;
}
else
{
index = 1;
}
return(e);
}
}
}
