author | wenzelm |
Sat, 23 Aug 2008 11:48:52 +0200 | |
changeset 27948 | 2638b611d3ce |
parent 27947 | b6dc0a396857 |
child 27952 | 0576c91a6803 |
permissions | -rw-r--r-- |
27931 | 1 |
/* Title: Pure/General/xml.scala |
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ID: $Id$ |
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Author: Makarius |
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Simple XML tree values. |
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*/ |
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package isabelle |
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import org.w3c.dom.{Node, Document} |
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import javax.xml.parsers.DocumentBuilderFactory |
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object XML { |
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/* datatype representation */ |
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type Attributes = List[(String, String)] |
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abstract class Tree |
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case class Elem(name: String, attributes: Attributes, body: List[Tree]) extends Tree |
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case class Text(content: String) extends Tree |
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/* iterate over content */ |
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private type State = Option[(String, List[Tree])] |
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private def get_next(tree: Tree): State = tree match { |
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case Elem(_, _, body) => get_nexts(body) |
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case Text(content) => Some(content, Nil) |
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} |
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private def get_nexts(trees: List[Tree]): State = trees match { |
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case Nil => None |
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case t :: ts => get_next(t) match { |
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case None => get_nexts(ts) |
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case Some((s, r)) => Some((s, r ::: ts)) |
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} |
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} |
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def content(tree: Tree) = new Iterator[String] { |
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private var state = get_next(tree) |
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def hasNext() = state.isDefined |
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def next() = state match { |
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case Some((s, rest)) => { state = get_nexts(rest); s } |
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case None => throw new NoSuchElementException("next on empty iterator") |
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} |
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} |
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/* document object model (DOM) */ |
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27948
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
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def document(tree: Tree, styles: String*) = { |
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val doc = DocumentBuilderFactory.newInstance.newDocumentBuilder.newDocument |
27948
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
54 |
doc.appendChild(doc.createProcessingInstruction("xml", "version=\"1.0\"")) |
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
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2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
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for (style <- styles) { |
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
57 |
doc.appendChild(doc.createProcessingInstruction("xml-stylesheet", |
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
58 |
"href=\"" + style + "\" type=\"text/css\"")) |
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
59 |
} |
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
60 |
|
2638b611d3ce
renamed DOM to document, add xml version and optional stylesheets;
wenzelm
parents:
27947
diff
changeset
|
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// main body |
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def dom_tree(tr: Tree): Node = tr match { |
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case Elem(name, atts, ts) => { |
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val node = doc.createElement(name) |
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for ((name, value) <- atts) node.setAttribute(name, value) |
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for (t <- ts) node.appendChild(dom_tree(t)) |
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node |
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} |
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case Text(txt) => doc.createTextNode(txt) |
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} |
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val root_elem = tree match { |
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case Elem(_, _, _) => dom_tree(tree) |
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case Text(_) => dom_tree(Elem("root", Nil, List(tree))) |
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} |
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doc.appendChild(root_elem) |
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doc |
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} |
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} |