summaryrefslogtreecommitdiff
path: root/libjava/classpath/gnu/javax/swing/text/html/parser/models/list.java
diff options
context:
space:
mode:
Diffstat (limited to 'libjava/classpath/gnu/javax/swing/text/html/parser/models/list.java')
-rw-r--r--libjava/classpath/gnu/javax/swing/text/html/parser/models/list.java384
1 files changed, 384 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/swing/text/html/parser/models/list.java b/libjava/classpath/gnu/javax/swing/text/html/parser/models/list.java
new file mode 100644
index 000000000..1ff22f8cd
--- /dev/null
+++ b/libjava/classpath/gnu/javax/swing/text/html/parser/models/list.java
@@ -0,0 +1,384 @@
+/* list.java --
+ Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.javax.swing.text.html.parser.models;
+
+import gnu.java.lang.CPStringBuilder;
+
+import java.io.Serializable;
+
+/**
+ * Part of the internal representation of the content model.
+ * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
+ */
+public class list
+ extends node
+ implements Serializable
+{
+ private static final long serialVersionUID = 1;
+
+ /**
+ * Setting to true means that the list nodes must always be connected
+ * by the same operation. This is far safer and clearer, but not
+ * required by default standard.
+ */
+ public static boolean CLEAR;
+
+ /**
+ * A list of nodes.
+ */
+ public final node[] nodes;
+
+ /**
+ * Creates a new model list that is a member of some enclosing list.
+ * @param binary_operator An operator with that this list is connected
+ * with other members of the enclosing list.
+ * @param unary_operator The unary operator for this list.
+ * @param a_nodes The nodes inside this list.
+ */
+ public list(char binary_operator, char unary_operator, node[] a_nodes)
+ {
+ super(binary_operator, unary_operator, a_nodes);
+ nodes = a_nodes;
+ }
+
+ /**
+ * Creates a new model list. Assigns the previous field.
+ * @param a_nodes The nodes for this list.
+ * @throws an error if the node elements are connected by the
+ * different operations. This is not supported, use grouping.
+ */
+ public list(node[] a_nodes)
+ throws Error
+ {
+ this(',', (char) 0, a_nodes);
+
+ int operation = nodes [ 0 ].binary;
+
+ for (int i = 0; i < nodes.length; i++)
+ {
+ if (CLEAR && nodes [ i ].binary != operation)
+ throw new Error("List members can only be connected by " +
+ "the same operation, use grouping"
+ );
+
+ if (i > 0)
+ nodes [ i ].previous = nodes [ i - 1 ];
+ }
+ }
+
+ /**
+ * Returns true if all members in the list are closed.
+ */
+ public boolean isClosed()
+ {
+ if (super.isClosed())
+ return true;
+ for (int i = 0; i < nodes.length; i++)
+ {
+ if (!nodes [ i ].isClosed())
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Find the token that could match as the next token in
+ * the token list.
+ *
+ * @return Such token object or null if none is found.
+ */
+ public Object findFreeNode()
+ {
+ Object fn;
+ for (int j = 0; j < nodes.length; j++)
+ {
+ if (!nodes [ j ].isClosed())
+ {
+ fn = nodes [ j ].findFreeNode();
+ if (fn != null)
+ return fn;
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Tries to match this list agains the given token sequence.
+ * @param tokens the sequence of the tokens to match.
+ * @return true if the valid match is found.
+ */
+ public boolean matches(Object[] tokens)
+ {
+ reset();
+
+ Object x;
+ boolean m;
+ boolean matched = false;
+
+ for (int i = 0; i < tokens.length; i++)
+ {
+ matched = false;
+ x = tokens [ i ];
+
+ nodescan:
+ for (int j = 0; j < nodes.length; j++)
+ {
+ if (!nodes [ j ].isClosed())
+ {
+ m = nodes [ j ].performMatch(x);
+
+ if (m)
+ {
+ matched = true;
+ break nodescan;
+ }
+ }
+ }
+ if (!matched)
+ return false;
+ }
+
+ boolean valid = true;
+
+ for (int i = 0; i < nodes.length; i++)
+ {
+ if (!nodes [ i ].valid())
+ valid = false;
+ }
+
+ return valid;
+ }
+
+ /**
+ * The list never closes, despite it is trated as closed
+ * if all members in the list are closed.
+ * @return false.
+ */
+ public boolean mustClose()
+ {
+ return false;
+ }
+
+ /**
+ * Perform a match operation for the single token
+ * against this list.
+ * @param token a token to match.
+ * @return true if the match is found.
+ */
+ public boolean performMatch(Object token)
+ {
+ boolean ok = false;
+ Matching:
+ for (int i = 0; i < nodes.length; i++)
+ {
+ ok = nodes [ i ].performMatch(token);
+
+ if (ok)
+ break Matching;
+ }
+
+ if (ok)
+ matches();
+
+ return ok;
+ }
+
+ /**
+ * Prepeares the list for the next matching operation.
+ */
+ public void reset()
+ {
+ super.reset();
+ for (int i = 0; i < nodes.length; i++)
+ nodes [ i ].reset();
+ }
+
+ /**
+ * Check if the provided token can match as a next token in the
+ * list. In the case of match, the list state changes, moving
+ * current position after the matched token. However if this method
+ * returns a suggested new token to insert before the provided one,
+ * the state of the list does not change.
+ * @return Boolean.TRUE if the match is found,
+ * Boolean.FALSE if the match is not possible and no token can be
+ * inserted to make the match valid. Otherwise, returns the
+ * token object that can be inserted before the last token in the
+ * list, probably (not for sure) making the match valid.
+ * If the object is an instance of Element or TagElement,
+ * it is first ensured that the object flag "omit start" is set.
+ */
+ public Object show(Object x)
+ {
+ boolean m;
+ boolean matched = false;
+
+ nodescan:
+ for (int j = 0; j < nodes.length; j++)
+ {
+ if (!nodes [ j ].isClosed())
+ {
+ m = nodes [ j ].performMatch(x);
+
+ if (m)
+ {
+ matched = true;
+ break nodescan;
+ }
+ else
+ {
+ // For comma operation, only first not closed
+ // node must be tested for a match.
+ // unless it allows matching zero times.
+ if (binary == ',' &&
+ !(nodes [ j ].unary == '?' || nodes [ j ].unary == '*')
+ )
+ break nodescan;
+ }
+ }
+ }
+
+ if (!matched)
+ {
+ // Find and return that would be matched.
+ Object freeNode = findFreeNode();
+ if (freeNode == null)
+ return Boolean.FALSE;
+ else
+ return freeNode;
+ }
+
+ for (int i = 0; i < nodes.length; i++)
+ if (!nodes [ i ].validPreliminary())
+ {
+ return Boolean.FALSE;
+ }
+
+ return Boolean.TRUE;
+ }
+
+ /**
+ * Returns a string representation of the list.
+ * @return String representation, similar to BNF expression.
+ */
+ public String toString()
+ {
+ CPStringBuilder b = new CPStringBuilder();
+ b.append(" ( ");
+ for (int i = 0; i < nodes.length; i++)
+ {
+ if (i > 0)
+ b.append(" " + (char) nodes [ i ].binary + " ");
+ b.append(nodes [ i ]);
+ }
+
+ b.append(" )");
+ if (unary != 0)
+ b.append((char) unary);
+ else
+ b.append(' ');
+ return b.toString();
+ }
+
+ /**
+ * Returns true if all memebers in the list are valid.
+ */
+ public boolean valid()
+ {
+ for (int i = 0; i < nodes.length; i++)
+ {
+ if (!nodes [ i ].valid())
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Returns true if all memebers in the list are either valid
+ * or unvisited. The unvisited members can become valid after
+ * more tokens will be shown.
+ */
+ public boolean validPreliminary()
+ {
+ if (silenceAllowed())
+ {
+ boolean everVisited = false;
+ for (int i = 0; i < nodes.length; i++)
+ {
+ if (nodes [ i ].visits > 0)
+ {
+ everVisited = true;
+ break;
+ }
+ }
+ if (!everVisited)
+ return true;
+ }
+
+ for (int i = 0; i < nodes.length; i++)
+ {
+ if (!nodes [ i ].validPreliminary())
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Closes all members in the list.
+ */
+ protected void close()
+ {
+ super.close();
+ for (int i = 0; i < nodes.length; i++)
+ {
+ nodes [ i ].close();
+ }
+ }
+
+ /**
+ * Compare given token with the token of this node.
+ * If the token represents a <code>list</code>, the call may be
+ * delegeted to the child subnodes.
+ * @param a_token A token to compare.
+ * @return True if the token matches the token of this node.
+ */
+ protected boolean compare(Object a_token)
+ {
+ return performMatch(a_token);
+ }
+}