mirror of git://gcc.gnu.org/git/gcc.git
534 lines
15 KiB
Java
534 lines
15 KiB
Java
/* FormatCharacter.java -- Implementation of AttributedCharacterIterator for
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formatters.
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Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.text;
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import java.text.AttributedCharacterIterator;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Set;
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import java.util.Vector;
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/**
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* This class should not be put public and it is only intended to the
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* classes of the java.text package. Its aim is to build a segmented
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* character iterator by appending strings and adding attributes to
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* portions of strings. The code intends to do some optimization
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* concerning memory consumption and attribute access but at the
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* end it is only an AttributedCharacterIterator.
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*
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* @author Guilhem Lavaux <guilhem@kaffe.org>
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* @date November 22, 2003
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*/
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public class FormatCharacterIterator implements AttributedCharacterIterator
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{
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private String formattedString;
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private int charIndex;
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private int attributeIndex;
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private int[] ranges;
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private HashMap[] attributes;
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private static final boolean DEBUG = false;
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/**
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* This constructor builds an empty iterated strings. The attributes
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* are empty and so is the string. However you may append strings
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* and attributes to this iterator.
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*/
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public FormatCharacterIterator()
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{
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formattedString = "";
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ranges = new int[0];
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attributes = new HashMap[0];
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}
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/**
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* This constructor take a string <code>s</code>, a set of ranges
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* and the corresponding attributes. This is used to build an iterator.
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* The array <code>ranges</code> should be formatted as follow:
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* each element of <code>ranges</code> specifies the index in the string
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* until which the corresponding map of attributes at the same position
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* is applied. For example, if you have:
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* <pre>
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* s = "hello";
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* ranges = new int[] { 2, 6 };
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* attributes = new HashMap[2];
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* </pre>
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* <code>"he"</code> will have the attributes <code>attributes[0]</code>,
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* <code>"llo"</code> the <code>attributes[1]</code>.
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*/
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public FormatCharacterIterator (String s, int[] ranges, HashMap[] attributes)
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{
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formattedString = s;
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this.ranges = ranges;
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this.attributes = attributes;
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}
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/*
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* The following methods are inherited from AttributedCharacterIterator,
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* and thus are already documented.
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*/
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public Set getAllAttributeKeys()
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{
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if (attributes != null && attributes[attributeIndex] != null)
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return attributes[attributeIndex].keySet();
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else
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return new HashSet();
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}
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public Map getAttributes()
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{
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if (attributes != null && attributes[attributeIndex] != null)
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return attributes[attributeIndex];
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else
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return new HashMap();
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}
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public Object getAttribute (AttributedCharacterIterator.Attribute attrib)
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{
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if (attributes != null && attributes[attributeIndex] != null)
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return attributes[attributeIndex].get (attrib);
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else
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return null;
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}
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public int getRunLimit(Set reqAttrs)
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{
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if (attributes == null)
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return formattedString.length();
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int currentAttrIndex = attributeIndex;
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Set newKeys;
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do
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{
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currentAttrIndex++;
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if (currentAttrIndex == attributes.length)
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return formattedString.length();
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if (attributes[currentAttrIndex] == null)
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break;
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newKeys = attributes[currentAttrIndex].keySet();
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}
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while (newKeys.containsAll (reqAttrs));
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return ranges[currentAttrIndex-1];
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}
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public int getRunLimit (AttributedCharacterIterator.Attribute attribute)
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{
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Set s = new HashSet();
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s.add (attribute);
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return getRunLimit (s);
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}
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public int getRunLimit()
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{
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if (attributes == null)
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return formattedString.length();
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if (attributes[attributeIndex] == null)
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{
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for (int i=attributeIndex+1;i<attributes.length;i++)
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if (attributes[i] != null)
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return ranges[i-1];
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return formattedString.length();
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}
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return getRunLimit (attributes[attributeIndex].keySet());
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}
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public int getRunStart (Set reqAttrs)
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{
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if (attributes == null)
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return formattedString.length();
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int currentAttrIndex = attributeIndex;
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Set newKeys = null;
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do
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{
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if (currentAttrIndex == 0)
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return 0;
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currentAttrIndex--;
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if (attributes[currentAttrIndex] == null)
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break;
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newKeys = attributes[currentAttrIndex].keySet();
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}
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while (newKeys.containsAll (reqAttrs));
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return (currentAttrIndex > 0) ? ranges[currentAttrIndex-1] : 0;
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}
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public int getRunStart()
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{
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if (attributes == null)
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return 0;
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if (attributes[attributeIndex] == null)
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{
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for (int i=attributeIndex;i>0;i--)
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if (attributes[i] != null)
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return ranges[attributeIndex-1];
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return 0;
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}
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return getRunStart (attributes[attributeIndex].keySet());
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}
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public int getRunStart (AttributedCharacterIterator.Attribute attribute)
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{
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Set s = new HashSet();
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s.add (attribute);
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return getRunStart (s);
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}
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public Object clone()
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{
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return new FormatCharacterIterator (formattedString, ranges, attributes);
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}
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/*
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* The following methods are inherited from CharacterIterator and thus
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* are already documented.
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*/
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public char current()
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{
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return formattedString.charAt (charIndex);
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}
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public char first()
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{
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charIndex = 0;
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attributeIndex = 0;
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return formattedString.charAt (0);
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}
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public int getBeginIndex()
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{
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return 0;
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}
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public int getEndIndex()
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{
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return formattedString.length();
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}
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public int getIndex()
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{
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return charIndex;
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}
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public char last()
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{
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charIndex = formattedString.length()-1;
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if (attributes != null)
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attributeIndex = attributes.length-1;
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return formattedString.charAt (charIndex);
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}
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public char next()
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{
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charIndex++;
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if (charIndex >= formattedString.length())
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{
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charIndex = getEndIndex();
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return DONE;
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}
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if (attributes != null)
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{
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if (charIndex >= ranges[attributeIndex])
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attributeIndex++;
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}
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return formattedString.charAt (charIndex);
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}
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public char previous()
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{
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charIndex--;
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if (charIndex < 0)
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{
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charIndex = 0;
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return DONE;
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}
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if (attributes != null)
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{
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if (charIndex < ranges[attributeIndex])
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attributeIndex--;
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}
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return formattedString.charAt (charIndex);
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}
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public char setIndex (int position)
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{
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if (position < 0 || position > formattedString.length())
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throw new IllegalArgumentException ("position is out of range");
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charIndex = position;
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if (attributes != null)
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{
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for (attributeIndex=0;attributeIndex<attributes.length;
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attributeIndex++)
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if (ranges[attributeIndex] > charIndex)
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break;
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attributeIndex--;
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}
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if (charIndex == formattedString.length())
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return DONE;
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else
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return formattedString.charAt (charIndex);
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}
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/**
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* This method merge the specified attributes and ranges with the
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* internal tables. This method is in charge of the optimization
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* of tables. Two following sets of attributes are never the same.
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*
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* @see #FormatCharacterIterator()
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*
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* @param attributes the new array attributes to apply to the string.
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*/
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public void mergeAttributes (HashMap[] attributes, int[] ranges)
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{
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Vector new_ranges = new Vector();
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Vector new_attributes = new Vector();
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int i = 0, j = 0;
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debug("merging " + attributes.length + " attrs");
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while (i < this.ranges.length && j < ranges.length)
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{
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if (this.attributes[i] != null)
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{
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new_attributes.add (this.attributes[i]);
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if (attributes[j] != null)
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this.attributes[i].putAll (attributes[j]);
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}
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else
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{
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new_attributes.add (attributes[j]);
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}
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if (this.ranges[i] == ranges[j])
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{
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new_ranges.add (new Integer (ranges[j]));
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i++;
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j++;
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}
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else if (this.ranges[i] < ranges[j])
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{
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new_ranges.add (new Integer (this.ranges[i]));
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i++;
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}
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else
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{
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new_ranges.add (new Integer (ranges[j]));
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j++;
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}
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}
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if (i != this.ranges.length)
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{
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for (;i<this.ranges.length;i++)
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{
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new_attributes.add (this.attributes[i]);
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new_ranges.add (new Integer (this.ranges[i]));
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}
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}
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if (j != ranges.length)
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{
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for (;j<ranges.length;j++)
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{
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new_attributes.add (attributes[j]);
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new_ranges.add (new Integer (ranges[j]));
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}
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}
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this.attributes = new HashMap[new_attributes.size()];
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this.ranges = new int[new_ranges.size()];
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System.arraycopy (new_attributes.toArray(), 0, this.attributes,
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0, this.attributes.length);
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for (i=0;i<new_ranges.size();i++)
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{
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this.ranges[i] = ((Integer)new_ranges.elementAt (i)).intValue();
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}
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dumpTable();
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}
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/**
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* This method appends to the internal attributed string the attributed
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* string contained in the specified iterator.
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*
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* @param iterator the iterator which contains the attributed string to
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* append to this iterator.
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*/
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public void append (AttributedCharacterIterator iterator)
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{
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char c = iterator.first();
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Vector more_ranges = new Vector();
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Vector more_attributes = new Vector();
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do
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{
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formattedString = formattedString + String.valueOf (c);
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// TODO: Reduce the size of the output array.
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more_attributes.add (iterator.getAttributes());
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more_ranges.add (new Integer (formattedString.length()));
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// END TOOD
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c = iterator.next();
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}
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while (c != DONE);
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HashMap[] new_attributes = new HashMap[attributes.length
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+ more_attributes.size()];
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int[] new_ranges = new int[ranges.length + more_ranges.size()];
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System.arraycopy (attributes, 0, new_attributes, 0, attributes.length);
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System.arraycopy (more_attributes.toArray(), 0, new_attributes,
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attributes.length, more_attributes.size());
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System.arraycopy (ranges, 0, new_ranges, 0, ranges.length);
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Object[] new_ranges_array = more_ranges.toArray();
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for (int i = 0; i < more_ranges.size();i++)
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new_ranges[i+ranges.length] = ((Integer) new_ranges_array[i]).intValue();
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attributes = new_attributes;
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ranges = new_ranges;
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}
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/**
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* This method appends an attributed string which attributes are specified
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* directly in the calling parameters.
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*
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* @param text The string to append.
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* @param local_attributes The attributes to put on this string in the
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* iterator. If it is <code>null</code> the string will simply have no
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* attributes.
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*/
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public void append (String text, HashMap local_attributes)
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{
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int[] new_ranges = new int[ranges.length+1];
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HashMap[] new_attributes = new HashMap[attributes.length+1];
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formattedString += text;
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System.arraycopy (attributes, 0, new_attributes, 0, attributes.length);
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System.arraycopy (ranges, 0, new_ranges, 0, ranges.length);
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new_ranges[ranges.length] = formattedString.length();
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new_attributes[attributes.length] = local_attributes;
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ranges = new_ranges;
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attributes = new_attributes;
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}
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/**
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* This method appends a string without attributes. It is completely
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* equivalent to call {@link #append(String,HashMap)} with local_attributes
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* equal to <code>null</code>.
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*
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* @param text The string to append to the iterator.
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*/
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public void append (String text)
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{
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append (text, null);
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}
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/**
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* This method adds a set of attributes to a range of character. The
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* bounds are always inclusive. In the case many attributes have to
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* be added it is advised to directly use {@link #mergeAttributes([Ljava.util.HashMap;[I}
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*
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* @param attributes Attributes to merge into the iterator.
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* @param range_start Lower bound of the range of characters which will receive the
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* attribute.
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* @param range_end Upper bound of the range of characters which will receive the
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* attribute.
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*
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* @throws IllegalArgumentException if ranges are out of bounds.
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*/
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public void addAttributes(HashMap attributes, int range_start, int range_end)
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{
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if (range_start == 0)
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mergeAttributes(new HashMap[] { attributes }, new int[] { range_end });
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else
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mergeAttributes(new HashMap[] { null, attributes }, new int[] { range_start, range_end });
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}
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private void debug(String s)
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{
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if (DEBUG)
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System.out.println(s);
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}
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private void dumpTable()
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{
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int start_range = 0;
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if (!DEBUG)
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return;
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System.out.println("Dumping internal table:");
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for (int i = 0; i < ranges.length; i++)
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{
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System.out.print("\t" + start_range + " => " + ranges[i] + ":");
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if (attributes[i] == null)
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System.out.println("null");
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else
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{
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Set keyset = attributes[i].keySet();
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if (keyset != null)
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{
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Iterator keys = keyset.iterator();
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while (keys.hasNext())
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System.out.print(" " + keys.next());
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}
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else
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System.out.println("keySet null");
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System.out.println();
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}
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}
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System.out.println();
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System.out.flush();
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}
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}
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