diff options
Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/util/regex/CharIndexedInputStream.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/util/regex/CharIndexedInputStream.java | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/util/regex/CharIndexedInputStream.java b/gcc-4.4.3/libjava/classpath/gnu/java/util/regex/CharIndexedInputStream.java new file mode 100644 index 000000000..e42710b5d --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/util/regex/CharIndexedInputStream.java @@ -0,0 +1,253 @@ +/* gnu/regexp/CharIndexedInputStream.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; +import java.io.BufferedInputStream; +import java.io.IOException; +import java.io.InputStream; + +// TODO: move(x) shouldn't rely on calling next() x times + +class CharIndexedInputStream implements CharIndexed +{ + private static final int BUFFER_INCREMENT = 1024; + private static final int UNKNOWN = Integer.MAX_VALUE; // value for end + + private BufferedInputStream br; + + // so that we don't try to reset() right away + private int index = -1; + + private int bufsize = BUFFER_INCREMENT; + + private int end = UNKNOWN; + + private char cached = OUT_OF_BOUNDS; + + // Big enough for a \r\n pair + // lookBehind[0] = most recent + // lookBehind[1] = second most recent + private char[] lookBehind = new char[]{ OUT_OF_BOUNDS, OUT_OF_BOUNDS }; + + CharIndexedInputStream (InputStream str, int index) + { + if (str instanceof BufferedInputStream) + br = (BufferedInputStream) str; + else + br = new BufferedInputStream (str, BUFFER_INCREMENT); + next (); + if (index > 0) + move (index); + } + + private boolean next () + { + if (end == 1) + return false; + end--; // closer to end + + try + { + if (index != -1) + { + br.reset (); + } + int i = br.read (); + br.mark (bufsize); + if (i == -1) + { + end = 1; + cached = OUT_OF_BOUNDS; + return false; + } + cached = (char) i; + index = 1; + } catch (IOException e) + { + e.printStackTrace (); + cached = OUT_OF_BOUNDS; + return false; + } + return true; + } + + public char charAt (int index) + { + if (index == 0) + { + return cached; + } + else if (index >= end) + { + return OUT_OF_BOUNDS; + } + else if (index == -1) + { + return lookBehind[0]; + } + else if (index == -2) + { + return lookBehind[1]; + } + else if (index < -2) + { + return OUT_OF_BOUNDS; + } + else if (index >= bufsize) + { + // Allocate more space in the buffer. + try + { + while (bufsize <= index) + bufsize += BUFFER_INCREMENT; + br.reset (); + br.mark (bufsize); + br.skip (index - 1); + } + catch (IOException e) + { + } + } + else if (this.index != index) + { + try + { + br.reset (); + br.skip (index - 1); + } + catch (IOException e) + { + } + } + char ch = OUT_OF_BOUNDS; + + try + { + int i = br.read (); + this.index = index + 1; // this.index is index of next pos relative to charAt(0) + if (i == -1) + { + // set flag that next should fail next time? + end = index; + return ch; + } + ch = (char) i; + } catch (IOException ie) + { + } + + return ch; + } + + public boolean move (int index) + { + // move read position [index] clicks from 'charAt(0)' + boolean retval = true; + while (retval && (index-- > 0)) + retval = next (); + return retval; + } + + public boolean isValid () + { + return (cached != OUT_OF_BOUNDS); + } + + public CharIndexed lookBehind (int index, int length) + { + throw new + UnsupportedOperationException + ("difficult to look behind for an input stream"); + } + + public int length () + { + throw new + UnsupportedOperationException + ("difficult to tell the length for an input stream"); + } + + public void setLastMatch (REMatch match) + { + throw new + UnsupportedOperationException + ("difficult to support setLastMatch for an input stream"); + } + + public REMatch getLastMatch () + { + throw new + UnsupportedOperationException + ("difficult to support getLastMatch for an input stream"); + } + + public void setHitEnd (REMatch match) + { + throw new + UnsupportedOperationException + ("difficult to support setHitEnd for an input stream"); + } + + public boolean hitEnd () + { + throw new + UnsupportedOperationException + ("difficult to support hitEnd for an input stream"); + } + + public int getAnchor () + { + throw new + UnsupportedOperationException + ("difficult to support getAnchor for an input stream"); + } + + public void setAnchor (int anchor) + { + throw new + UnsupportedOperationException + ("difficult to support setAnchor for an input stream"); + } + + public boolean move1 (int index) + { + throw new + UnsupportedOperationException + ("difficult to support move1 for an input stream"); + } + +} |