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Diffstat (limited to 'src/xml/scala/xml/PrettyPrinter.scala')
| -rwxr-xr-x | src/xml/scala/xml/PrettyPrinter.scala | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/src/xml/scala/xml/PrettyPrinter.scala b/src/xml/scala/xml/PrettyPrinter.scala deleted file mode 100755 index 9e01905357..0000000000 --- a/src/xml/scala/xml/PrettyPrinter.scala +++ /dev/null @@ -1,263 +0,0 @@ -/* __ *\ -** ________ ___ / / ___ Scala API ** -** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL ** -** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ ** -** /____/\___/_/ |_/____/_/ | | ** -** |/ ** -\* */ - -package scala -package xml - -import Utility.sbToString - -/** Class for pretty printing. After instantiating, you can use the - * format() and formatNode() methods to convert XML to a formatted - * string. The class can be reused to pretty print any number of - * XML nodes. - * - * @author Burak Emir - * @version 1.0 - * - * @param width the width to fit the output into - * @param step indentation - */ -class PrettyPrinter(width: Int, step: Int) { - - class BrokenException() extends java.lang.Exception - - class Item - case object Break extends Item { - override def toString() = "\\" - } - case class Box(col: Int, s: String) extends Item - case class Para(s: String) extends Item - - protected var items: List[Item] = Nil - - protected var cur = 0 - - protected def reset() = { - cur = 0 - items = Nil - } - - /** Try to cut at whitespace. - */ - protected def cut(s: String, ind: Int): List[Item] = { - val tmp = width - cur - if (s.length <= tmp) - return List(Box(ind, s)) - var i = s indexOf ' ' - if (i > tmp || i == -1) throw new BrokenException() // cannot break - - var last: List[Int] = Nil - while (i != -1 && i < tmp) { - last = i::last - i = s.indexOf(' ', i+1) - } - var res: List[Item] = Nil - while (Nil != last) try { - val b = Box(ind, s.substring(0, last.head)) - cur = ind - res = b :: Break :: cut(s.substring(last.head, s.length), ind) - // backtrack - last = last.tail - } catch { - case _:BrokenException => last = last.tail - } - throw new BrokenException() - } - - /** Try to make indented box, if possible, else para. - */ - protected def makeBox(ind: Int, s: String) = - if (cur + s.length > width) { // fits in this line - items ::= Box(ind, s) - cur += s.length - } - else try cut(s, ind) foreach (items ::= _) // break it up - catch { case _: BrokenException => makePara(ind, s) } // give up, para - - // dont respect indent in para, but afterwards - protected def makePara(ind: Int, s: String) = { - items = Break::Para(s)::Break::items - cur = ind - } - - // respect indent - protected def makeBreak() = { // using wrapping here... - items = Break :: items - cur = 0 - } - - protected def leafTag(n: Node) = { - def mkLeaf(sb: StringBuilder) { - sb append '<' - n nameToString sb - n.attributes buildString sb - sb append "/>" - } - sbToString(mkLeaf) - } - - protected def startTag(n: Node, pscope: NamespaceBinding): (String, Int) = { - var i = 0 - def mkStart(sb: StringBuilder) { - sb append '<' - n nameToString sb - i = sb.length + 1 - n.attributes buildString sb - n.scope.buildString(sb, pscope) - sb append '>' - } - (sbToString(mkStart), i) - } - - protected def endTag(n: Node) = { - def mkEnd(sb: StringBuilder) { - sb append "</" - n nameToString sb - sb append '>' - } - sbToString(mkEnd) - } - - protected def childrenAreLeaves(n: Node): Boolean = { - def isLeaf(l: Node) = l match { - case _:Atom[_] | _:Comment | _:EntityRef | _:ProcInstr => true - case _ => false - } - n.child forall isLeaf - } - - protected def fits(test: String) = - test.length < width - cur - - private def doPreserve(node: Node) = - node.attribute(XML.namespace, XML.space).map(_.toString == XML.preserve) getOrElse false - - protected def traverse(node: Node, pscope: NamespaceBinding, ind: Int): Unit = node match { - - case Text(s) if s.trim() == "" => - ; - case _:Atom[_] | _:Comment | _:EntityRef | _:ProcInstr => - makeBox( ind, node.toString().trim() ) - case g @ Group(xs) => - traverse(xs.iterator, pscope, ind) - case _ => - val test = { - val sb = new StringBuilder() - Utility.serialize(node, pscope, sb, stripComments = false) - if (doPreserve(node)) sb.toString - else TextBuffer.fromString(sb.toString).toText(0).data - } - if (childrenAreLeaves(node) && fits(test)) { - makeBox(ind, test) - } else { - val (stg, len2) = startTag(node, pscope) - val etg = endTag(node) - if (stg.length < width - cur) { // start tag fits - makeBox(ind, stg) - makeBreak() - traverse(node.child.iterator, node.scope, ind + step) - makeBox(ind, etg) - } else if (len2 < width - cur) { - // <start label + attrs + tag + content + end tag - makeBox(ind, stg.substring(0, len2)) - makeBreak() // todo: break the rest in pieces - /*{ //@todo - val sq:Seq[String] = stg.split(" "); - val it = sq.iterator; - it.next; - for (c <- it) { - makeBox(ind+len2-2, c) - makeBreak() - } - }*/ - makeBox(ind, stg.substring(len2, stg.length)) - makeBreak() - traverse(node.child.iterator, node.scope, ind + step) - makeBox(cur, etg) - makeBreak() - } else { // give up - makeBox(ind, test) - makeBreak() - } - } - } - - protected def traverse(it: Iterator[Node], scope: NamespaceBinding, ind: Int ): Unit = - for (c <- it) { - traverse(c, scope, ind) - makeBreak() - } - - /** Appends a formatted string containing well-formed XML with - * given namespace to prefix mapping to the given string buffer. - * - * @param n the node to be serialized - * @param sb the stringbuffer to append to - */ - def format(n: Node, sb: StringBuilder) { // entry point - format(n, null, sb) - } - - def format(n: Node, pscope: NamespaceBinding, sb: StringBuilder) { // entry point - var lastwasbreak = false - reset() - traverse(n, pscope, 0) - var cur = 0 - for (b <- items.reverse) b match { - case Break => - if (!lastwasbreak) sb.append('\n') // on windows: \r\n ? - lastwasbreak = true - cur = 0 -// while (cur < last) { -// sb append ' ' -// cur += 1 -// } - - case Box(i, s) => - lastwasbreak = false - while (cur < i) { - sb append ' ' - cur += 1 - } - sb.append(s) - case Para( s ) => - lastwasbreak = false - sb append s - } - } - - // public convenience methods - - /** Returns a formatted string containing well-formed XML with - * given namespace to prefix mapping. - * - * @param n the node to be serialized - * @param pscope the namespace to prefix mapping - * @return the formatted string - */ - def format(n: Node, pscope: NamespaceBinding = null): String = - sbToString(format(n, pscope, _)) - - /** Returns a formatted string containing well-formed XML. - * - * @param nodes the sequence of nodes to be serialized - * @param pscope the namespace to prefix mapping - */ - def formatNodes(nodes: Seq[Node], pscope: NamespaceBinding = null): String = - sbToString(formatNodes(nodes, pscope, _)) - - /** Appends a formatted string containing well-formed XML with - * the given namespace to prefix mapping to the given stringbuffer. - * - * @param nodes the nodes to be serialized - * @param pscope the namespace to prefix mapping - * @param sb the string buffer to which to append to - */ - def formatNodes(nodes: Seq[Node], pscope: NamespaceBinding, sb: StringBuilder): Unit = - nodes foreach (n => sb append format(n, pscope)) -} |