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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/util/regex/REToken.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/util/regex/REToken.java')
-rw-r--r-- | libjava/classpath/gnu/java/util/regex/REToken.java | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/regex/REToken.java b/libjava/classpath/gnu/java/util/regex/REToken.java new file mode 100644 index 000000000..ed9b31747 --- /dev/null +++ b/libjava/classpath/gnu/java/util/regex/REToken.java @@ -0,0 +1,244 @@ +/* gnu/regexp/REToken.java + Copyright (C) 2006 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.java.util.regex; + +import gnu.java.lang.CPStringBuilder; + +import java.io.Serializable; + +abstract class REToken implements Serializable, Cloneable +{ + + protected REToken next = null; + protected REToken uncle = null; + protected int subIndex; + protected boolean unicodeAware = true; + + public Object clone () + { + try + { + REToken copy = (REToken) super.clone (); + return copy; + } + catch (CloneNotSupportedException e) + { + throw new Error (); // doesn't happen + } + } + + protected REToken (int subIndex) + { + this.subIndex = subIndex; + } + + int getMinimumLength () + { + return 0; + } + + int getMaximumLength () + { + return Integer.MAX_VALUE; + } + + void setUncle (REToken anUncle) + { + uncle = anUncle; + } + + /** Returns true if the match succeeded, false if it failed. */ + boolean match (CharIndexed input, REMatch mymatch) + { + return match (input, mymatch, false); + } + boolean matchFake (CharIndexed input, REMatch mymatch) + { + return match (input, mymatch, true); + } + + private boolean match (CharIndexed input, REMatch mymatch, boolean fake) + { + if (!fake) + { + setHitEnd (input, mymatch); + } + REMatch m = matchThis (input, mymatch); + if (m == null) + return false; + if (next (input, m)) + { + mymatch.assignFrom (m); + return true; + } + return false; + } + + /** Sets whether the matching occurs at the end of input */ + void setHitEnd (CharIndexed input, REMatch mymatch) + { + input.setHitEnd (mymatch); + } + + /** Returns true if the match succeeded, false if it failed. + * The matching is done against this REToken only. Chained + * tokens are not checked. + * This method is used to define the default match method. + * Simple subclasses of REToken, for example, such that + * matches only one character, should implement this method. + * Then the default match method will work. But complicated + * subclasses of REToken, which needs a special match method, + * do not have to implement this method. + */ + REMatch matchThis (CharIndexed input, REMatch mymatch) + { + throw new + UnsupportedOperationException + ("This REToken does not have a matchThis method"); + } + + /** Returns true if the rest of the tokens match, false if they fail. */ + protected boolean next (CharIndexed input, REMatch mymatch) + { + REToken nextToken = getNext (); + if (nextToken == null) + return true; + return nextToken.match (input, mymatch); + } + + /** Returns the next REToken chained to this REToken. */ + REToken getNext () + { + return (next != null ? next : uncle); + } + + /** Finds a match at the position specified by the given REMatch. + * If necessary, adds a BacktrackStack.Backtrack object to backtrackStack + * of the REmatch found this time so that another possible match + * may be found when backtrack is called. + * By default, nothing is added to the backtrackStack. + * @param input Input character sequence. + * @param mymatch Position at which a match should be found + * @return REMatch object if a match was found, null otherwise. + */ + REMatch findMatch (CharIndexed input, REMatch mymatch) + { + boolean b = match (input, mymatch); + if (b) + return mymatch; + return null; + } + + boolean returnsFixedLengthMatches () + { + return false; + } + + int findFixedLengthMatches (CharIndexed input, REMatch mymatch, int max) + { + throw new + UnsupportedOperationException + ("This token does not support findFixedLengthMatches"); + } + + /** + * Backtrack to another possibility. + * Ordinary REToken cannot do anything if this method is called. + */ + REMatch backtrack (CharIndexed input, REMatch mymatch, Object param) + { + throw new IllegalStateException ("This token cannot be backtracked to"); + } + + boolean chain (REToken token) + { + next = token; + return true; // Token was accepted + } + + abstract void dump (CPStringBuilder os); + + void dumpAll (CPStringBuilder os) + { + dump (os); + if (next != null) + next.dumpAll (os); + } + + public String toString () + { + CPStringBuilder os = new CPStringBuilder (); + dump (os); + return os.toString (); + } + + /** + * Converts the character argument to lowercase. + * @param ch the character to be converted. + * @param unicodeAware If true, use java.lang.Character#toLowerCase; + * otherwise, only US-ASCII charactes can be converted. + * @return the lowercase equivalent of the character, if any; + * otherwise, the character itself. + */ + public static char toLowerCase (char ch, boolean unicodeAware) + { + if (unicodeAware) + return Character.toLowerCase (ch); + if (ch >= 'A' && ch <= 'Z') + return (char) (ch + 'a' - 'A'); + return ch; + } + + /** + * Converts the character argument to uppercase. + * @param ch the character to be converted. + * @param unicodeAware If true, use java.lang.Character#toUpperCase; + * otherwise, only US-ASCII charactes can be converted. + * @return the uppercase equivalent of the character, if any; + * otherwise, the character itself. + */ + public static char toUpperCase (char ch, boolean unicodeAware) + { + if (unicodeAware) + return Character.toUpperCase (ch); + if (ch >= 'a' && ch <= 'z') + return (char) (ch + 'A' - 'a'); + return ch; + } + +} |