1 /* Title: Pure/PIDE/markup_tree.scala
3 Author: Fabian Immler, TU Munich
6 Markup trees over nested / non-overlapping text ranges.
11 import java.lang.System
12 import javax.swing.tree.DefaultMutableTreeNode
14 import scala.collection.immutable.SortedMap
19 sealed case class Cumulate[A](
20 info: A, result: PartialFunction[(A, Text.Markup), A], elements: Option[Set[String]])
21 sealed case class Select[A](
22 result: PartialFunction[Text.Markup, A], elements: Option[Set[String]])
24 val empty: Markup_Tree = new Markup_Tree(Branches.empty)
28 def apply(markup: Text.Markup, subtree: Markup_Tree): Entry =
29 Entry(markup.range, List(markup.info), Set(markup.info.markup.name), subtree)
32 sealed case class Entry(
34 rev_markup: List[XML.Elem],
35 elements: Set[String],
38 def + (info: XML.Elem): Entry =
39 if (elements(info.markup.name)) copy(rev_markup = info :: rev_markup)
40 else copy(rev_markup = info :: rev_markup, elements = elements + info.markup.name)
42 def markup: List[XML.Elem] = rev_markup.reverse
47 type T = SortedMap[Text.Range, Entry]
48 val empty: T = SortedMap.empty(Text.Range.Ordering)
53 class Markup_Tree private(branches: Markup_Tree.Branches.T)
55 private def this(branches: Markup_Tree.Branches.T, entry: Markup_Tree.Entry) =
56 this(branches + (entry.range -> entry))
61 override def toString =
62 branches.toList.map(_._2) match {
64 case list => list.mkString("Tree(", ",", ")")
67 private def overlapping(range: Text.Range): Branches.T =
69 val start = Text.Range(range.start)
70 val stop = Text.Range(range.stop)
71 val bs = branches.range(start, stop)
72 // FIXME check after Scala 2.8.x
73 branches.get(stop) match {
74 case Some(end) if range overlaps end.range => bs + (end.range -> end)
79 def + (new_markup: Text.Markup): Markup_Tree =
81 val new_range = new_markup.range
83 branches.get(new_range) match {
84 case None => new Markup_Tree(branches, Entry(new_markup, empty))
86 if (entry.range == new_range)
87 new Markup_Tree(branches, entry + new_markup.info)
88 else if (entry.range.contains(new_range))
89 new Markup_Tree(branches, entry.copy(subtree = entry.subtree + new_markup))
90 else if (new_range.contains(branches.head._1) && new_range.contains(branches.last._1))
91 new Markup_Tree(Branches.empty, Entry(new_markup, this))
93 val body = overlapping(new_range)
94 if (body.forall(e => new_range.contains(e._1))) {
95 val rest = // branches -- body, modulo workarounds for Redblack in Scala 2.8.0 FIXME
97 (Branches.empty /: branches)((rest, entry) =>
98 if (body.isDefinedAt(entry._1)) rest else rest + entry)
100 new Markup_Tree(rest, Entry(new_markup, new Markup_Tree(body)))
102 else { // FIXME split markup!?
103 System.err.println("Ignored overlapping markup information: " + new_markup)
110 def cumulate[A](root_range: Text.Range)(body: Cumulate[A]): Stream[Text.Info[A]] =
112 val root_info = body.info
114 def result(x: A, entry: Entry): Option[A] =
115 if (body.elements match { case Some(es) => es.exists(entry.elements) case None => true }) {
117 (entry.markup :\ (x, false))((info, res) =>
119 val (y, changed) = res
120 val arg = (y, Text.Info(entry.range, info))
121 if (body.result.isDefinedAt(arg)) (body.result(arg), true)
124 if (changed) Some(y) else None
130 stack: List[(Text.Info[A], Stream[(Text.Range, Entry)])]): Stream[Text.Info[A]] =
133 case (parent, (range, entry) #:: more) :: rest =>
134 val subrange = range.restrict(root_range)
135 val subtree = entry.subtree.overlapping(subrange).toStream
136 val start = subrange.start
138 result(parent.info, entry) match {
140 val next = Text.Info(subrange, res)
141 val nexts = stream(start, (next, subtree) :: (parent, more) :: rest)
142 if (last < start) parent.restrict(Text.Range(last, start)) #:: nexts
144 case None => stream(last, (parent, subtree #::: more) :: rest)
147 case (parent, Stream.Empty) :: rest =>
148 val stop = parent.range.stop
149 val nexts = stream(stop, rest)
150 if (last < stop) parent.restrict(Text.Range(last, stop)) #:: nexts
154 val stop = root_range.stop
155 if (last < stop) Stream(Text.Info(Text.Range(last, stop), root_info))
159 stream(root_range.start,
160 List((Text.Info(root_range, root_info), overlapping(root_range).toStream)))
163 def swing_tree(parent: DefaultMutableTreeNode)
164 (swing_node: Text.Markup => DefaultMutableTreeNode)
166 for ((_, entry) <- branches) {
168 for (info <- entry.markup) {
169 val node = swing_node(Text.Info(entry.range, info))
173 entry.subtree.swing_tree(current)(swing_node)