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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/CharIndexed.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/util/regex/CharIndexed.java')
-rw-r--r-- | libjava/classpath/gnu/java/util/regex/CharIndexed.java | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/regex/CharIndexed.java b/libjava/classpath/gnu/java/util/regex/CharIndexed.java new file mode 100644 index 000000000..de4b1667f --- /dev/null +++ b/libjava/classpath/gnu/java/util/regex/CharIndexed.java @@ -0,0 +1,134 @@ +/* gnu/regexp/CharIndexed.java + Copyright (C) 1998-2001, 2004, 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; + +/** + * Defines the interface used internally so that different types of source + * text can be accessed in the same way. Built-in concrete classes provide + * support for String, StringBuffer, InputStream and char[] types. + * A class that is CharIndexed supports the notion of a cursor within a + * block of text. The cursor must be able to be advanced via the move() + * method. The charAt() method returns the character at the cursor position + * plus a given offset. + * + * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A> + */ +public interface CharIndexed +{ + /** + * Defines a constant (0xFFFF was somewhat arbitrarily chosen) + * that can be returned by the charAt() function indicating that + * the specified index is out of range. + */ + char OUT_OF_BOUNDS = '\uFFFF'; + + /** + * Returns the character at the given offset past the current cursor + * position in the input. The index of the current position is zero. + * It is possible for this method to be called with a negative index. + * This happens when using the '^' operator in multiline matching mode + * or the '\b' or '\<' word boundary operators. In any case, the lower + * bound is currently fixed at -2 (for '^' with a two-character newline). + * + * @param index the offset position in the character field to examine + * @return the character at the specified index, or the OUT_OF_BOUNDS + * character defined by this interface. + */ + char charAt (int index); + + /** + * Shifts the input buffer by a given number of positions. Returns + * true if the new cursor position is valid. + */ + boolean move (int index); + + /** + * Shifts the input buffer by a given number of positions. Returns + * true if the new cursor position is valid or cursor position is at + * the end of input. + */ + boolean move1 (int index); // I cannot think of a better name for this. + + /** + * Returns true if the most recent move() operation placed the cursor + * position at a valid position in the input. + */ + boolean isValid (); + + /** + * Returns another CharIndexed containing length characters to the left + * of the given index. The given length is an expected maximum and + * the returned CharIndexed may not necessarily contain so many characters. + */ + CharIndexed lookBehind (int index, int length); + + /** + * Returns the effective length of this CharIndexed + */ + int length (); + + /** + * Sets the REMatch last found on this input. + */ + void setLastMatch (REMatch match); + + /** + * Returns the REMatch last found on this input. + */ + REMatch getLastMatch (); + + /** + * Sets the information used for hitEnd(). + */ + void setHitEnd (REMatch match); + + /** + * Returns whether the matcher has hit the end of input. + */ + boolean hitEnd (); + + /** + * Returns the anchor. + */ + int getAnchor (); + + /** + * Sets the anchor. + */ + void setAnchor (int anchor); +} |