/* Title: Pure/PIDE/markup_tree.scala
Module: PIDE
Author: Fabian Immler, TU Munich
Author: Makarius
Markup trees over nested / non-overlapping text ranges.
*/
package isabelle
import scala.collection.immutable.SortedMap
import scala.collection.mutable
import scala.annotation.tailrec
object Markup_Tree
{
/* construct trees */
val empty: Markup_Tree = new Markup_Tree(Branches.empty)
def merge_disjoint(trees: List[Markup_Tree]): Markup_Tree =
trees match {
case Nil => empty
case head :: tail =>
new Markup_Tree(
(head.branches /: tail) {
case (branches, tree) =>
(branches /: tree.branches) {
case (bs, (r, entry)) =>
require(!bs.isDefinedAt(r))
bs + (r -> entry)
}
})
}
/* tree building blocks */
object Elements
{
val empty = new Elements(Set.empty)
}
final class Elements private(private val rep: Set[String])
{
def contains(name: String): Boolean = rep.contains(name)
def + (name: String): Elements =
if (contains(name)) this
else new Elements(rep + name)
def + (elem: XML.Elem): Elements = this + elem.markup.name
def ++ (elems: Iterable[XML.Elem]): Elements = (this /: elems.iterator)(_ + _)
def ++ (other: Elements): Elements =
if (this eq other) this
else if (rep.isEmpty) other
else (this /: other.rep)(_ + _)
}
object Entry
{
def apply(markup: Text.Markup, subtree: Markup_Tree): Entry =
Entry(markup.range, List(markup.info), Elements.empty + markup.info,
subtree, subtree.make_elements)
def apply(range: Text.Range, rev_markups: List[XML.Elem], subtree: Markup_Tree): Entry =
Entry(range, rev_markups, Elements.empty ++ rev_markups,
subtree, subtree.make_elements)
}
sealed case class Entry(
range: Text.Range,
rev_markup: List[XML.Elem],
elements: Elements,
subtree: Markup_Tree,
subtree_elements: Elements)
{
def markup: List[XML.Elem] = rev_markup.reverse
def + (markup: Text.Markup): Entry =
copy(rev_markup = markup.info :: rev_markup, elements = elements + markup.info)
def \ (markup: Text.Markup): Entry =
copy(subtree = subtree + markup, subtree_elements = subtree_elements + markup.info)
}
object Branches
{
type T = SortedMap[Text.Range, Entry]
val empty: T = SortedMap.empty(Text.Range.Ordering)
}
/* XML representation */
@tailrec private def strip_elems(
elems: List[XML.Elem], body: XML.Body): (List[XML.Elem], XML.Body) =
body match {
case List(XML.Wrapped_Elem(markup1, body1, body2)) =>
strip_elems(XML.Elem(markup1, body1) :: elems, body2)
case List(XML.Elem(markup1, body1)) =>
strip_elems(XML.Elem(markup1, Nil) :: elems, body1)
case _ => (elems, body)
}
private def make_trees(acc: (Int, List[Markup_Tree]), tree: XML.Tree): (Int, List[Markup_Tree]) =
{
val (offset, markup_trees) = acc
strip_elems(Nil, List(tree)) match {
case (Nil, body) =>
(offset + XML.text_length(body), markup_trees)
case (elems, body) =>
val (end_offset, subtrees) = ((offset, Nil: List[Markup_Tree]) /: body)(make_trees)
if (offset == end_offset) acc
else {
val range = Text.Range(offset, end_offset)
val entry = Entry(range, elems, merge_disjoint(subtrees))
(end_offset, new Markup_Tree(Branches.empty, entry) :: markup_trees)
}
}
}
def from_XML(body: XML.Body): Markup_Tree =
merge_disjoint(((0, Nil: List[Markup_Tree]) /: body)(make_trees)._2)
}
final class Markup_Tree private(val branches: Markup_Tree.Branches.T)
{
import Markup_Tree._
private def this(branches: Markup_Tree.Branches.T, entry: Markup_Tree.Entry) =
this(branches + (entry.range -> entry))
override def toString =
branches.toList.map(_._2) match {
case Nil => "Empty"
case list => list.mkString("Tree(", ",", ")")
}
private def overlapping(range: Text.Range): Branches.T =
{
val start = Text.Range(range.start)
val stop = Text.Range(range.stop)
val bs = branches.range(start, stop)
branches.get(stop) match {
case Some(end) if range overlaps end.range => bs + (end.range -> end)
case _ => bs
}
}
def make_elements: Elements =
(Elements.empty /: branches)(
{ case (elements, (_, entry)) => elements ++ entry.subtree_elements ++ entry.elements })
def + (new_markup: Text.Markup): Markup_Tree =
{
val new_range = new_markup.range
branches.get(new_range) match {
case None => new Markup_Tree(branches, Entry(new_markup, empty))
case Some(entry) =>
if (entry.range == new_range)
new Markup_Tree(branches, entry + new_markup)
else if (entry.range.contains(new_range))
new Markup_Tree(branches, entry \ new_markup)
else if (new_range.contains(branches.head._1) && new_range.contains(branches.last._1))
new Markup_Tree(Branches.empty, Entry(new_markup, this))
else {
val body = overlapping(new_range)
if (body.forall(e => new_range.contains(e._1)))
new Markup_Tree(branches -- body.keys, Entry(new_markup, new Markup_Tree(body)))
else {
java.lang.System.err.println("Ignored overlapping markup information: " + new_markup +
body.filter(e => !new_range.contains(e._1)).mkString("\n"))
this
}
}
}
}
def to_XML(root_range: Text.Range, text: CharSequence, filter: XML.Elem => Boolean): XML.Body =
{
def make_text(start: Text.Offset, stop: Text.Offset): XML.Body =
if (start == stop) Nil
else List(XML.Text(text.subSequence(start, stop).toString))
def make_elems(rev_markups: List[XML.Elem], body: XML.Body): XML.Body =
(body /: rev_markups) {
case (b, elem) =>
if (!filter(elem)) b
else if (elem.body.isEmpty) List(XML.Elem(elem.markup, b))
else List(XML.Wrapped_Elem(elem.markup, elem.body, b))
}
def make_body(elem_range: Text.Range, elem_markup: List[XML.Elem], entries: Branches.T)
: XML.Body =
{
val body = new mutable.ListBuffer[XML.Tree]
var last = elem_range.start
for ((range, entry) <- entries) {
val subrange = range.restrict(elem_range)
body ++= make_text(last, subrange.start)
body ++= make_body(subrange, entry.rev_markup, entry.subtree.overlapping(subrange))
last = subrange.stop
}
body ++= make_text(last, elem_range.stop)
make_elems(elem_markup, body.toList)
}
make_body(root_range, Nil, overlapping(root_range))
}
def to_XML(text: CharSequence): XML.Body =
to_XML(Text.Range(0, text.length), text, (_: XML.Elem) => true)
def cumulate[A](root_range: Text.Range, root_info: A, result_elements: Option[Set[String]],
result: PartialFunction[(A, Text.Markup), A]): Stream[Text.Info[A]] =
{
val notable: Elements => Boolean =
result_elements match {
case Some(res) => (elements: Elements) => res.exists(elements.contains)
case None => (elements: Elements) => true
}
def results(x: A, entry: Entry): Option[A] =
{
val (y, changed) =
// FIXME proper cumulation order (including status markup) (!?)
((x, false) /: entry.rev_markup)((res, info) =>
{
val (y, changed) = res
val arg = (y, Text.Info(entry.range, info))
if (result.isDefinedAt(arg)) (result(arg), true)
else res
})
if (changed) Some(y) else None
}
def stream(
last: Text.Offset,
stack: List[(Text.Info[A], Stream[(Text.Range, Entry)])]): Stream[Text.Info[A]] =
{
stack match {
case (parent, (range, entry) #:: more) :: rest =>
val subrange = range.restrict(root_range)
val subtree =
if (notable(entry.subtree_elements))
entry.subtree.overlapping(subrange).toStream
else Stream.empty
val start = subrange.start
(if (notable(entry.elements)) results(parent.info, entry) else None) match {
case Some(res) =>
val next = Text.Info(subrange, res)
val nexts = stream(start, (next, subtree) :: (parent, more) :: rest)
if (last < start) parent.restrict(Text.Range(last, start)) #:: nexts
else nexts
case None => stream(last, (parent, subtree #::: more) :: rest)
}
case (parent, Stream.Empty) :: rest =>
val stop = parent.range.stop
val nexts = stream(stop, rest)
if (last < stop) parent.restrict(Text.Range(last, stop)) #:: nexts
else nexts
case Nil =>
val stop = root_range.stop
if (last < stop) Stream(Text.Info(Text.Range(last, stop), root_info))
else Stream.empty
}
}
stream(root_range.start,
List((Text.Info(root_range, root_info), overlapping(root_range).toStream)))
}
}