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// $Id$
package scala.xml
import parsing.XhtmlEntities
/* (c) David Pollak 2007 WorldWide Conferencing, LLC */
object Xhtml
{
/**
* Convenience function: same as toXhtml(node, false, false)
*
* @param node the node
*/
def toXhtml(node: Node): String = toXhtml(node, false, false)
/**
* Convenience function: amounts to calling toXhtml(node) on each
* node in the sequence.
*
* @param nodeSeq the node sequence
*/
def toXhtml(nodeSeq: NodeSeq): String = {
val sb = new StringBuilder
sequenceToXML(nodeSeq, TopScope, sb, false, false)
sb.toString
}
/**
* Convenience function: amounts to calling toXhtml(node, TopScope, ...)
* with the supplied parameters.
*
* @param nodeSeq the node sequence
*/
def toXhtml(n: Node, stripComment: Boolean, convertAmp: Boolean): String = {
val sb = new StringBuilder()
toXhtml(n, TopScope, sb, stripComment, convertAmp)
sb.toString()
}
/**
* Appends a tree to the given stringbuffer within given namespace scope.
*
* @param n the node
* @param pscope the parent scope
* @param sb stringbuffer to append to
* @param stripComment if true, strip comments
* @param convertAmp if true, decode entity references
*/
def toXhtml(
x: Node,
pscope: NamespaceBinding,
sb: StringBuilder,
stripComment: Boolean,
convertAmp: Boolean): Unit =
{
def decode(er: EntityRef) = XhtmlEntities.entMap.get(er.entityName) match {
case Some(chr) if chr.toInt >= 128 => sb.append(chr)
case _ => er.buildString(sb)
}
def shortForm =
(x.child == null || x.child.length == 0) &&
!(List("div", "script", "textarea") contains x.label)
x match {
case c: Comment if !stripComment => c.buildString(sb)
case er: EntityRef if convertAmp => decode(er)
case x: SpecialNode => x.buildString(sb)
case g: Group =>
g.nodes foreach { toXhtml(_, x.scope, sb, stripComment, convertAmp) }
case _ =>
sb.append('<')
x.nameToString(sb)
if (x.attributes ne null) x.attributes.buildString(sb)
x.scope.buildString(sb, pscope)
if (shortForm) sb.append(" />")
else {
sb.append('>')
sequenceToXML(x.child, x.scope, sb, stripComment, convertAmp)
sb.append("</")
x.nameToString(sb)
sb.append('>')
}
}
}
/**
* Amounts to calling toXhtml(node, ...) with the given parameters on each node.
*/
def sequenceToXML(
children: Seq[Node],
pscope: NamespaceBinding,
sb: StringBuilder,
stripComment: Boolean,
convertAmp: Boolean): Unit =
{
def isAtomAndNotText(x: Node) = x.isInstanceOf[Atom[_]] && !x.isInstanceOf[Text]
val doSpaces = children forall isAtomAndNotText // interleave spaces
for (c <- children.take(children.length - 1)) {
toXhtml(c, pscope, sb, stripComment, convertAmp)
if (doSpaces) sb append ' '
}
toXhtml(children.last, pscope, sb, stripComment, convertAmp)
}
}
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