--- a/src/Pure/General/xml.scala Mon Sep 05 19:18:38 2011 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,390 +0,0 @@
-/* Title: Pure/General/xml.scala
- Author: Makarius
-
-Untyped XML trees.
-*/
-
-package isabelle
-
-import java.lang.System
-import java.util.WeakHashMap
-import java.lang.ref.WeakReference
-import javax.xml.parsers.DocumentBuilderFactory
-
-import scala.actors.Actor._
-import scala.collection.mutable
-
-
-object XML
-{
- /** XML trees **/
-
- /* datatype representation */
-
- type Attributes = Properties.T
-
- sealed abstract class Tree { override def toString = string_of_tree(this) }
- case class Elem(markup: Markup, body: List[Tree]) extends Tree
- case class Text(content: String) extends Tree
-
- def elem(name: String, body: List[Tree]) = Elem(Markup(name, Nil), body)
- def elem(name: String) = Elem(Markup(name, Nil), Nil)
-
- type Body = List[Tree]
-
-
- /* string representation */
-
- def string_of_body(body: Body): String =
- {
- val s = new StringBuilder
-
- def text(txt: String) {
- if (txt == null) s ++= txt
- else {
- for (c <- txt.iterator) c match {
- case '<' => s ++= "<"
- case '>' => s ++= ">"
- case '&' => s ++= "&"
- case '"' => s ++= """
- case '\'' => s ++= "'"
- case _ => s += c
- }
- }
- }
- def attrib(p: (String, String)) { s ++= " "; s ++= p._1; s ++= "=\""; text(p._2); s ++= "\"" }
- def elem(markup: Markup) { s ++= markup.name; markup.properties.foreach(attrib) }
- def tree(t: Tree): Unit =
- t match {
- case Elem(markup, Nil) =>
- s ++= "<"; elem(markup); s ++= "/>"
- case Elem(markup, ts) =>
- s ++= "<"; elem(markup); s ++= ">"
- ts.foreach(tree)
- s ++= "</"; s ++= markup.name; s ++= ">"
- case Text(txt) => text(txt)
- }
- body.foreach(tree)
- s.toString
- }
-
- def string_of_tree(tree: XML.Tree): String = string_of_body(List(tree))
-
-
- /* text content */
-
- def content_stream(tree: Tree): Stream[String] =
- tree match {
- case Elem(_, body) => content_stream(body)
- case Text(content) => Stream(content)
- }
- def content_stream(body: Body): Stream[String] =
- body.toStream.flatten(content_stream(_))
-
- def content(tree: Tree): Iterator[String] = content_stream(tree).iterator
- def content(body: Body): Iterator[String] = content_stream(body).iterator
-
-
- /* pipe-lined cache for partial sharing */
-
- class Cache(initial_size: Int = 131071, max_string: Int = 100)
- {
- private val cache_actor = actor
- {
- val table = new WeakHashMap[Any, WeakReference[Any]](initial_size)
-
- def lookup[A](x: A): Option[A] =
- {
- val ref = table.get(x)
- if (ref == null) None
- else {
- val y = ref.asInstanceOf[WeakReference[A]].get
- if (y == null) None
- else Some(y)
- }
- }
- def store[A](x: A): A =
- {
- table.put(x, new WeakReference[Any](x))
- x
- }
-
- def trim_bytes(s: String): String = new String(s.toCharArray)
-
- def cache_string(x: String): String =
- lookup(x) match {
- case Some(y) => y
- case None =>
- val z = trim_bytes(x)
- if (z.length > max_string) z else store(z)
- }
- def cache_props(x: Properties.T): Properties.T =
- if (x.isEmpty) x
- else
- lookup(x) match {
- case Some(y) => y
- case None => store(x.map(p => (trim_bytes(p._1).intern, cache_string(p._2))))
- }
- def cache_markup(x: Markup): Markup =
- lookup(x) match {
- case Some(y) => y
- case None =>
- x match {
- case Markup(name, props) =>
- store(Markup(cache_string(name), cache_props(props)))
- }
- }
- def cache_tree(x: XML.Tree): XML.Tree =
- lookup(x) match {
- case Some(y) => y
- case None =>
- x match {
- case XML.Elem(markup, body) =>
- store(XML.Elem(cache_markup(markup), cache_body(body)))
- case XML.Text(text) => store(XML.Text(cache_string(text)))
- }
- }
- def cache_body(x: XML.Body): XML.Body =
- if (x.isEmpty) x
- else
- lookup(x) match {
- case Some(y) => y
- case None => x.map(cache_tree(_))
- }
-
- // main loop
- loop {
- react {
- case Cache_String(x, f) => f(cache_string(x))
- case Cache_Markup(x, f) => f(cache_markup(x))
- case Cache_Tree(x, f) => f(cache_tree(x))
- case Cache_Body(x, f) => f(cache_body(x))
- case Cache_Ignore(x, f) => f(x)
- case bad => System.err.println("XML.cache_actor: ignoring bad input " + bad)
- }
- }
- }
-
- private case class Cache_String(x: String, f: String => Unit)
- private case class Cache_Markup(x: Markup, f: Markup => Unit)
- private case class Cache_Tree(x: XML.Tree, f: XML.Tree => Unit)
- private case class Cache_Body(x: XML.Body, f: XML.Body => Unit)
- private case class Cache_Ignore[A](x: A, f: A => Unit)
-
- // main methods
- def cache_string(x: String)(f: String => Unit) { cache_actor ! Cache_String(x, f) }
- def cache_markup(x: Markup)(f: Markup => Unit) { cache_actor ! Cache_Markup(x, f) }
- def cache_tree(x: XML.Tree)(f: XML.Tree => Unit) { cache_actor ! Cache_Tree(x, f) }
- def cache_body(x: XML.Body)(f: XML.Body => Unit) { cache_actor ! Cache_Body(x, f) }
- def cache_ignore[A](x: A)(f: A => Unit) { cache_actor ! Cache_Ignore(x, f) }
- }
-
-
-
- /** document object model (W3C DOM) **/
-
- def get_data(node: org.w3c.dom.Node): Option[XML.Tree] =
- node.getUserData(Markup.Data.name) match {
- case tree: XML.Tree => Some(tree)
- case _ => None
- }
-
- def document_node(doc: org.w3c.dom.Document, tree: Tree): org.w3c.dom.Node =
- {
- def DOM(tr: Tree): org.w3c.dom.Node = tr match {
- case Elem(Markup.Data, List(data, t)) =>
- val node = DOM(t)
- node.setUserData(Markup.Data.name, data, null)
- node
- case Elem(Markup(name, atts), ts) =>
- if (name == Markup.Data.name)
- error("Malformed data element: " + tr.toString)
- val node = doc.createElement(name)
- for ((name, value) <- atts) node.setAttribute(name, value)
- for (t <- ts) node.appendChild(DOM(t))
- node
- case Text(txt) => doc.createTextNode(txt)
- }
- DOM(tree)
- }
-
-
-
- /** XML as data representation language **/
-
- class XML_Atom(s: String) extends Exception(s)
- class XML_Body(body: XML.Body) extends Exception
-
- object Encode
- {
- type T[A] = A => XML.Body
-
-
- /* atomic values */
-
- def long_atom(i: Long): String = i.toString
-
- def int_atom(i: Int): String = i.toString
-
- def bool_atom(b: Boolean): String = if (b) "1" else "0"
-
- def unit_atom(u: Unit) = ""
-
-
- /* structural nodes */
-
- private def node(ts: XML.Body): XML.Tree = XML.Elem(Markup(":", Nil), ts)
-
- private def vector(xs: List[String]): XML.Attributes =
- xs.zipWithIndex.map(p => (int_atom(p._2), p._1))
-
- private def tagged(tag: Int, data: (List[String], XML.Body)): XML.Tree =
- XML.Elem(Markup(int_atom(tag), vector(data._1)), data._2)
-
-
- /* representation of standard types */
-
- val properties: T[Properties.T] =
- (props => List(XML.Elem(Markup(":", props), Nil)))
-
- val string: T[String] = (s => if (s.isEmpty) Nil else List(XML.Text(s)))
-
- val long: T[Long] = (x => string(long_atom(x)))
-
- val int: T[Int] = (x => string(int_atom(x)))
-
- val bool: T[Boolean] = (x => string(bool_atom(x)))
-
- val unit: T[Unit] = (x => string(unit_atom(x)))
-
- def pair[A, B](f: T[A], g: T[B]): T[(A, B)] =
- (x => List(node(f(x._1)), node(g(x._2))))
-
- def triple[A, B, C](f: T[A], g: T[B], h: T[C]): T[(A, B, C)] =
- (x => List(node(f(x._1)), node(g(x._2)), node(h(x._3))))
-
- def list[A](f: T[A]): T[List[A]] =
- (xs => xs.map((x: A) => node(f(x))))
-
- def option[A](f: T[A]): T[Option[A]] =
- {
- case None => Nil
- case Some(x) => List(node(f(x)))
- }
-
- def variant[A](fs: List[PartialFunction[A, (List[String], XML.Body)]]): T[A] =
- {
- case x =>
- val (f, tag) = fs.iterator.zipWithIndex.find(p => p._1.isDefinedAt(x)).get
- List(tagged(tag, f(x)))
- }
- }
-
- object Decode
- {
- type T[A] = XML.Body => A
- type V[A] = (List[String], XML.Body) => A
-
-
- /* atomic values */
-
- def long_atom(s: String): Long =
- try { java.lang.Long.parseLong(s) }
- catch { case e: NumberFormatException => throw new XML_Atom(s) }
-
- def int_atom(s: String): Int =
- try { Integer.parseInt(s) }
- catch { case e: NumberFormatException => throw new XML_Atom(s) }
-
- def bool_atom(s: String): Boolean =
- if (s == "1") true
- else if (s == "0") false
- else throw new XML_Atom(s)
-
- def unit_atom(s: String): Unit =
- if (s == "") () else throw new XML_Atom(s)
-
-
- /* structural nodes */
-
- private def node(t: XML.Tree): XML.Body =
- t match {
- case XML.Elem(Markup(":", Nil), ts) => ts
- case _ => throw new XML_Body(List(t))
- }
-
- private def vector(atts: XML.Attributes): List[String] =
- {
- val xs = new mutable.ListBuffer[String]
- var i = 0
- for ((a, x) <- atts) {
- if (int_atom(a) == i) { xs += x; i = i + 1 }
- else throw new XML_Atom(a)
- }
- xs.toList
- }
-
- private def tagged(t: XML.Tree): (Int, (List[String], XML.Body)) =
- t match {
- case XML.Elem(Markup(name, atts), ts) => (int_atom(name), (vector(atts), ts))
- case _ => throw new XML_Body(List(t))
- }
-
-
- /* representation of standard types */
-
- val properties: T[Properties.T] =
- {
- case List(XML.Elem(Markup(":", props), Nil)) => props
- case ts => throw new XML_Body(ts)
- }
-
- val string: T[String] =
- {
- case Nil => ""
- case List(XML.Text(s)) => s
- case ts => throw new XML_Body(ts)
- }
-
- val long: T[Long] = (x => long_atom(string(x)))
-
- val int: T[Int] = (x => int_atom(string(x)))
-
- val bool: T[Boolean] = (x => bool_atom(string(x)))
-
- val unit: T[Unit] = (x => unit_atom(string(x)))
-
- def pair[A, B](f: T[A], g: T[B]): T[(A, B)] =
- {
- case List(t1, t2) => (f(node(t1)), g(node(t2)))
- case ts => throw new XML_Body(ts)
- }
-
- def triple[A, B, C](f: T[A], g: T[B], h: T[C]): T[(A, B, C)] =
- {
- case List(t1, t2, t3) => (f(node(t1)), g(node(t2)), h(node(t3)))
- case ts => throw new XML_Body(ts)
- }
-
- def list[A](f: T[A]): T[List[A]] =
- (ts => ts.map(t => f(node(t))))
-
- def option[A](f: T[A]): T[Option[A]] =
- {
- case Nil => None
- case List(t) => Some(f(node(t)))
- case ts => throw new XML_Body(ts)
- }
-
- def variant[A](fs: List[V[A]]): T[A] =
- {
- case List(t) =>
- val (tag, (xs, ts)) = tagged(t)
- val f =
- try { fs(tag) }
- catch { case _: IndexOutOfBoundsException => throw new XML_Body(List(t)) }
- f(xs, ts)
- case ts => throw new XML_Body(ts)
- }
- }
-}