author | wenzelm |
Thu, 06 May 2010 17:49:57 +0200 | |
changeset 36684 | 943f1ca7b375 |
parent 34201 | c95dcd12f48a |
child 36685 | 2b3076cfd6dd |
permissions | -rw-r--r-- |
27930 | 1 |
/* Title: Pure/General/yxml.scala |
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Author: Makarius |
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Efficient text representation of XML trees. |
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*/ |
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package isabelle |
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import scala.collection.mutable.ListBuffer |
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object YXML |
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{ |
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/* chunk markers */ |
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private val X = '\5' |
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private val Y = '\6' |
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private val X_string = X.toString |
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private val Y_string = Y.toString |
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/* iterate over chunks (resembles space_explode in ML) */ |
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private def chunks(sep: Char, source: CharSequence) = new Iterator[CharSequence] |
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{ |
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parents:
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private val end = source.length |
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private var state = if (end == 0) None else get_chunk(-1) |
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private def get_chunk(i: Int) = |
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{ |
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if (i < end) { |
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var j = i; do j += 1 while (j < end && source.charAt(j) != sep) |
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Some((source.subSequence(i + 1, j), j)) |
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} |
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else None |
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} |
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replaced Pattern.split by chunks iterator (more efficient, resembles ML version more closely);
wenzelm
parents:
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def hasNext() = state.isDefined |
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def next() = state match { |
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case Some((s, i)) => { state = get_chunk(i); s } |
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case None => throw new NoSuchElementException("next on empty iterator") |
f34ff5e7728f
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} |
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replaced Pattern.split by chunks iterator (more efficient, resembles ML version more closely);
wenzelm
parents:
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} |
f34ff5e7728f
replaced Pattern.split by chunks iterator (more efficient, resembles ML version more closely);
wenzelm
parents:
27930
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f34ff5e7728f
replaced Pattern.split by chunks iterator (more efficient, resembles ML version more closely);
wenzelm
parents:
27930
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changeset
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34099
2541de190d92
added decode_chars, with raw character view on byte buffer and adhoc decoding via toString;
wenzelm
parents:
32450
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/* decoding pseudo UTF-8 */ |
2541de190d92
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private class Decode_Chars(decode: String => String, |
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buffer: Array[Byte], start: Int, end: Int) extends CharSequence |
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{ |
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def length: Int = end - start |
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def charAt(i: Int): Char = (buffer(start + i).asInstanceOf[Int] & 0xFF).asInstanceOf[Char] |
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def subSequence(i: Int, j: Int): CharSequence = |
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new Decode_Chars(decode, buffer, start + i, start + j) |
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// toString with adhoc decoding: abuse of CharSequence interface |
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separate Standard_System (Cygwin/Posix compatibility) vs. Isabelle_System (settings environment etc.);
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override def toString: String = decode(Standard_System.decode_permissive_utf8(this)) |
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} |
2541de190d92
added decode_chars, with raw character view on byte buffer and adhoc decoding via toString;
wenzelm
parents:
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2541de190d92
added decode_chars, with raw character view on byte buffer and adhoc decoding via toString;
wenzelm
parents:
32450
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changeset
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def decode_chars(decode: String => String, |
2541de190d92
added decode_chars, with raw character view on byte buffer and adhoc decoding via toString;
wenzelm
parents:
32450
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changeset
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buffer: Array[Byte], start: Int, end: Int): CharSequence = |
2541de190d92
added decode_chars, with raw character view on byte buffer and adhoc decoding via toString;
wenzelm
parents:
32450
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changeset
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{ |
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require(0 <= start && start <= end && end <= buffer.length) |
2541de190d92
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new Decode_Chars(decode, buffer, start, end) |
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} |
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/* parsing */ |
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private def err(msg: String) = error("Malformed YXML: " + msg) |
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private def err_attribute() = err("bad attribute") |
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private def err_element() = err("bad element") |
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private def err_unbalanced(name: String) = |
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if (name == "") err("unbalanced element") |
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else err("unbalanced element \"" + name + "\"") |
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parse_attrib: more efficient due to indexOf('=');
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private def parse_attrib(source: CharSequence) = { |
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val s = source.toString |
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val i = s.indexOf('=') |
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if (i <= 0) err_attribute() |
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(s.substring(0, i).intern, s.substring(i + 1)) |
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} |
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def parse_body(source: CharSequence): List[XML.Tree] = |
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/* stack operations */ |
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def buffer(): ListBuffer[XML.Tree] = new ListBuffer[XML.Tree] |
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var stack: List[((String, XML.Attributes), ListBuffer[XML.Tree])] = List((("", Nil), buffer())) |
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def add(x: XML.Tree) |
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(stack: @unchecked) match { case ((_, body) :: _) => body += x } |
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} |
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def push(name: String, atts: XML.Attributes) |
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{ |
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if (name == "") err_element() |
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else stack = ((name, atts), buffer()) :: stack |
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} |
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def pop() |
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{ |
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(stack: @unchecked) match { |
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case ((("", _), _) :: _) => err_unbalanced("") |
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case (((name, atts), body) :: pending) => |
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stack = pending; add(XML.Elem(name, atts, body.toList)) |
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} |
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} |
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/* parse chunks */ |
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34099
2541de190d92
added decode_chars, with raw character view on byte buffer and adhoc decoding via toString;
wenzelm
parents:
32450
diff
changeset
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for (chunk <- chunks(X, source) if chunk.length != 0) { |
2541de190d92
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if (chunk.length == 1 && chunk.charAt(0) == Y) pop() |
27945
d2dc5a1903e8
tuned parse performance: avoid splitting terminal Y chunk;
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else { |
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chunks(Y, chunk).toList match { |
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case ch :: name :: atts if ch.length == 0 => |
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push(name.toString.intern, atts.map(parse_attrib)) |
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case txts => for (txt <- txts) add(XML.Text(txt.toString)) |
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} |
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} |
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} |
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stack match { |
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case List((("", _), body)) => body.toList |
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case ((name, _), _) :: _ => err_unbalanced(name) |
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} |
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} |
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def parse(source: CharSequence): XML.Tree = |
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parse_body(source) match { |
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case List(result) => result |
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case Nil => XML.Text("") |
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case _ => err("multiple results") |
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} |
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/* failsafe parsing */ |
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private def markup_failsafe(source: CharSequence) = |
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XML.Elem (Markup.MALFORMED, Nil, |
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List(XML.Text(source.toString.replace(X_string, "\\<^X>").replace(Y_string, "\\<^Y>")))) |
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def parse_body_failsafe(source: CharSequence): List[XML.Tree] = |
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{ |
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try { parse_body(source) } |
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catch { case _: RuntimeException => List(markup_failsafe(source)) } |
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} |
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def parse_failsafe(source: CharSequence): XML.Tree = |
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{ |
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try { parse(source) } |
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catch { case _: RuntimeException => markup_failsafe(source) } |
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} |
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} |