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/* Title: Pure/General/pretty.scala
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Author: Makarius
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Symbolic pretty printing.
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*/
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package isabelle
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object Pretty
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{
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object Block
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{
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def apply(indent: Int, body: List[XML.Tree]): XML.Tree =
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XML.Elem(Markup.BLOCK, List((Markup.INDENT, indent.toString)), body)
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def unapply(tree: XML.Tree): Option[(Int, List[XML.Tree])] =
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tree match {
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case XML.Elem(Markup.BLOCK, List((Markup.INDENT, indent)), body) =>
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Markup.parse_int(indent) match {
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case Some(i) => Some((i, body))
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case None => None
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}
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case _ => None
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}
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}
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object Break
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{
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def apply(width: Int): XML.Tree =
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XML.Elem(Markup.BREAK, List((Markup.WIDTH, width.toString)), List(XML.Text(" " * width)))
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def unapply(tree: XML.Tree): Option[Int] =
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tree match {
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case XML.Elem(Markup.BREAK, List((Markup.WIDTH, width)), _) => Markup.parse_int(width)
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case _ => None
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}
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}
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object FBreak
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{
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def apply(): XML.Tree = XML.Elem(Markup.FBREAK, Nil, List(XML.Text(" ")))
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def unapply(tree: XML.Tree): Boolean =
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tree match {
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case XML.Elem(Markup.FBREAK, Nil, _) => true
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case _ => false
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}
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}
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}
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