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-rw-r--r--libjava/java/text/RuleBasedCollator.java366
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-// RuleBasedCollator.java - Concrete class for locale-based string compare.
-
-/* Copyright (C) 1999, 2000 Free Software Foundation
-
- This file is part of libgcj.
-
-This software is copyrighted work licensed under the terms of the
-Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
-details. */
-
-package java.text;
-
-import java.util.Enumeration;
-import java.util.Hashtable;
-import java.util.Vector;
-
-/**
- * @author Tom Tromey <tromey@cygnus.com>
- * @date March 25, 1999
- */
-/* Written using "Java Class Libraries", 2nd edition, plus online
- * API docs for JDK 1.2 from http://www.javasoft.com.
- * Status: Believed complete and correct
- */
-
-final class RBCElement
-{
- String key;
- char relation;
-
- RBCElement (String key, char relation)
- {
- this.key = key;
- this.relation = relation;
- }
-}
-
-public class RuleBasedCollator extends Collator
-{
- public Object clone ()
- {
- return new RuleBasedCollator (this);
- }
-
- // A helper for CollationElementIterator.next().
- int ceiNext (CollationElementIterator cei)
- {
- if (cei.lookahead_set)
- {
- cei.lookahead_set = false;
- return cei.lookahead;
- }
-
- int save = cei.index;
- int max = cei.text.length();
- String s = null;
-
- // It is possible to have a case where `abc' has a mapping, but
- // neither `ab' nor `abd' do. In this case we must treat `abd' as
- // nothing special.
- boolean found = false;
-
- int i;
- for (i = save + 1; i <= max; ++i)
- {
- s = cei.text.substring(save, i);
- if (prefixes.get(s) == null)
- break;
- found = true;
- }
- // Assume s != null.
-
- Object obj = map.get(s);
- // The special case.
- while (found && obj == null && s.length() > 1)
- {
- --i;
- s = cei.text.substring(save, i);
- obj = map.get(s);
- }
-
- // Update state.
- cei.index = i;
-
- if (obj == null)
- {
- // This idea, and the values, come from JDK.
- // assert (s.length() == 1)
- cei.lookahead_set = true;
- cei.lookahead = s.charAt(0) << 8;
- return 0x7fff << 16;
- }
-
- return ((Integer) obj).intValue();
- }
-
- // A helper for compareTo() that returns the next character that has
- // a nonzero ordering at the indicated strength. This is also used
- // in CollationKey.
- static final int next (CollationElementIterator iter, int strength)
- {
- while (true)
- {
- int os = iter.next();
- if (os == CollationElementIterator.NULLORDER)
- return os;
- int c = 0;
- switch (strength)
- {
- case PRIMARY:
- c = os & ~0xffff;
- break;
- case SECONDARY:
- c = os & ~0x00ff;
- break;
- case TERTIARY:
- case IDENTICAL:
- c = os;
- break;
- }
- if (c != 0)
- return c;
- }
- }
-
- public int compare (String source, String target)
- {
- CollationElementIterator cs, ct;
-
- cs = new CollationElementIterator (source, this);
- ct = new CollationElementIterator (target, this);
-
- while (true)
- {
- int os = next (cs, strength);
- int ot = next (ct, strength);
-
- if (os == CollationElementIterator.NULLORDER
- && ot == CollationElementIterator.NULLORDER)
- break;
- else if (os == CollationElementIterator.NULLORDER)
- {
- // Source string is shorter, so return "less than".
- return -1;
- }
- else if (ot == CollationElementIterator.NULLORDER)
- {
- // Target string is shorter, so return "greater than".
- return 1;
- }
-
- if (os != ot)
- return os - ot;
- }
-
- return 0;
- }
-
- public boolean equals (Object obj)
- {
- if (! (obj instanceof RuleBasedCollator) || ! super.equals(obj))
- return false;
- RuleBasedCollator rbc = (RuleBasedCollator) obj;
- // FIXME: this is probably wrong. Instead we should compare maps
- // directly.
- return (frenchAccents == rbc.frenchAccents
- && rules.equals(rbc.rules));
- }
-
- public CollationElementIterator getCollationElementIterator (String source)
- {
- StringBuffer expand = new StringBuffer (source.length());
- int max = source.length();
- for (int i = 0; i < max; ++i)
- decomposeCharacter (source.charAt(i), expand);
- return new CollationElementIterator (expand.toString(), this);
- }
-
- public CollationKey getCollationKey (String source)
- {
- return new CollationKey (getCollationElementIterator (source), source,
- strength);
- }
-
- public String getRules ()
- {
- return rules;
- }
-
- public int hashCode ()
- {
- return (frenchAccents ? 1231 : 1237
- ^ rules.hashCode()
- ^ map.hashCode()
- ^ prefixes.hashCode());
- }
-
- private final boolean is_special (char c)
- {
- // Rules from JCL book.
- return ((c >= 0x0009 && c <= 0x000d)
- || (c >= 0x0020 && c <= 0x002f)
- || (c >= 0x003a && c <= 0x0040)
- || (c >= 0x005b && c <= 0x0060)
- || (c >= 0x007b && c <= 0x007e));
- }
-
- private final int text_argument (String rules, int index,
- StringBuffer result)
- {
- result.setLength(0);
- int len = rules.length();
- while (index < len)
- {
- char c = rules.charAt(index);
- if (c == '\'' && index + 2 < len
- && rules.charAt(index + 2) == '\''
- && is_special (rules.charAt(index + 1)))
- index += 2;
- else if (is_special (c) || Character.isWhitespace(c))
- return index;
- result.append(c);
- ++index;
- }
- return index;
- }
-
- public RuleBasedCollator (String rules) throws ParseException
- {
- this.rules = rules;
- this.frenchAccents = false;
-
- // We keep each rule in order in a vector. At the end we traverse
- // the vector and compute collation values from it.
- int insertion_index = 0;
- Vector vec = new Vector ();
-
- StringBuffer argument = new StringBuffer ();
-
- int len = rules.length();
- for (int index = 0; index < len; ++index)
- {
- char c = rules.charAt(index);
-
- // Just skip whitespace.
- if (Character.isWhitespace(c))
- continue;
-
- // Modifier.
- if (c == '@')
- {
- frenchAccents = true;
- continue;
- }
-
- // Check for relation or reset operator.
- if (! (c == '<' || c == ';' || c == ',' || c == '=' || c == '&'))
- throw new ParseException ("invalid character", index);
-
- ++index;
- while (index < len)
- {
- if (! Character.isWhitespace(rules.charAt(index)))
- break;
- ++index;
- }
- if (index == len)
- throw new ParseException ("missing argument", index);
-
- int save = index;
- index = text_argument (rules, index, argument);
- if (argument.length() == 0)
- throw new ParseException ("invalid character", save);
- String arg = argument.toString();
- int item_index = vec.indexOf(arg);
- if (c != '&')
- {
- // If the argument already appears in the vector, then we
- // must remove it in order to re-order.
- if (item_index != -1)
- {
- vec.removeElementAt(item_index);
- if (insertion_index >= item_index)
- --insertion_index;
- }
- RBCElement r = new RBCElement (arg, c);
- vec.insertElementAt(r, insertion_index);
- ++insertion_index;
- }
- else
- {
- // Reset.
- if (item_index == -1)
- throw
- new ParseException ("argument to reset not previously seen",
- save);
- insertion_index = item_index + 1;
- }
-
- // Ugly: in this case the resulting INDEX comes from
- // text_argument, which returns the index of the next
- // character we should examine.
- --index;
- }
-
- // Now construct a hash table that maps strings onto their
- // collation values.
- int primary = 0;
- int secondary = 0;
- int tertiary = 0;
- this.map = new Hashtable ();
- this.prefixes = new Hashtable ();
- Enumeration e = vec.elements();
- while (e.hasMoreElements())
- {
- RBCElement r = (RBCElement) e.nextElement();
- switch (r.relation)
- {
- case '<':
- ++primary;
- secondary = 0;
- tertiary = 0;
- break;
- case ';':
- ++secondary;
- tertiary = 0;
- break;
- case ',':
- ++tertiary;
- break;
- case '=':
- break;
- }
- // This must match CollationElementIterator.
- map.put(r.key, new Integer (primary << 16
- | secondary << 8 | tertiary));
-
- // Make a map of all lookaheads we might need.
- for (int i = r.key.length() - 1; i >= 1; --i)
- prefixes.put(r.key.substring(0, i), Boolean.TRUE);
- }
- }
-
- // This is a helper for clone.
- private RuleBasedCollator (RuleBasedCollator other)
- {
- frenchAccents = other.frenchAccents;
- rules = other.rules;
- decmp = other.decmp;
- strength = other.strength;
- map = other.map;
- prefixes = other.prefixes;
- }
-
- // True if we are using French-style accent ordering.
- private boolean frenchAccents;
-
- // It's easier to just save the rules than to try to recreate them.
- private String rules;
-
- // This maps strings onto collation values.
- private Hashtable map;
- // An entry in this hash means that more lookahead is required for
- // the prefix string.
- private Hashtable prefixes;
-}
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