Source Code Cross Referenced for REFilterReader.java in  » IDE » J » gnu » regexp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » J » gnu.regexp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  gnu/regexp/REFilterReader.java
003:         *  Copyright (C) 2001 Lee Sau Dan
004:         *  Based on gnu.regexp.REFilterInputStream by Wes Biggs
005:         *
006:         *  This library is free software; you can redistribute it and/or modify
007:         *  it under the terms of the GNU Lesser General Public License as published
008:         *  by the Free Software Foundation; either version 2.1 of the License, or
009:         *  (at your option) any later version.
010:         *
011:         *  This library is distributed in the hope that it will be useful,
012:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014:         *  GNU Lesser General Public License for more details.
015:         *
016:         *  You should have received a copy of the GNU Lesser General Public License
017:         *  along with this program; if not, write to the Free Software
018:         *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
019:         */
020:
021:        package gnu.regexp;
022:
023:        import java.io.FilterReader;
024:        import java.io.Reader;
025:
026:        /**
027:         * Replaces instances of a given RE with replacement text. 
028:         *
029:         * @author <A HREF="http://www.csis.hku.hk/~sdlee/">Lee Sau Dan</A>
030:         * @since gnu.regexp 1.1.0
031:         */
032:
033:        public class REFilterReader extends FilterReader {
034:
035:            private RE expr;
036:            private String replace;
037:            private String buffer;
038:            private int bufpos;
039:            private int offset;
040:            private CharIndexedReader stream;
041:
042:            /**
043:             * Creates an REFilterReader.  When reading from this stream,
044:             * occurrences of patterns matching the supplied regular expression
045:             * will be replaced with the supplied replacement text (the
046:             * metacharacters $0 through $9 may be used to refer to the full
047:             * match or subexpression matches.
048:             *
049:             * @param stream The Reader to be filtered.
050:             * @param expr The regular expression to search for.
051:             * @param replace The text pattern to replace matches with.  
052:             */
053:            public REFilterReader(Reader stream, RE expr, String replace) {
054:                super (stream);
055:                this .stream = new CharIndexedReader(stream, 0);
056:                this .expr = expr;
057:                this .replace = replace;
058:            }
059:
060:            /**
061:             * Reads the next character from the stream per the general contract of
062:             * Reader.read().  Returns -1 on error or end of stream.
063:             */
064:            public int read() {
065:                // If we have buffered replace data, use it.
066:                if ((buffer != null) && (bufpos < buffer.length())) {
067:                    return (int) buffer.charAt(bufpos++);
068:                }
069:
070:                // check if input is at a valid position
071:                if (!stream.isValid())
072:                    return -1;
073:
074:                REMatch mymatch = new REMatch(expr.getNumSubs(), offset, 0);
075:                if (expr.match(stream, mymatch)) {
076:                    mymatch.end[0] = mymatch.index;
077:                    mymatch.finish(stream);
078:                    stream.move(mymatch.toString().length());
079:                    offset += mymatch.toString().length();
080:                    buffer = mymatch.substituteInto(replace);
081:                    bufpos = 1;
082:
083:                    if (buffer.length() > 0) {
084:                        return buffer.charAt(0);
085:                    }
086:                }
087:                char ch = stream.charAt(0);
088:                if (ch == CharIndexed.OUT_OF_BOUNDS)
089:                    return -1;
090:                stream.move(1);
091:                offset++;
092:                return ch;
093:            }
094:
095:            /** 
096:             * Returns false.  REFilterReader does not support mark() and
097:             * reset() methods. 
098:             */
099:            public boolean markSupported() {
100:                return false;
101:            }
102:
103:            /** Reads from the stream into the provided array. */
104:            public int read(char[] b, int off, int len) {
105:                int i;
106:                int ok = 0;
107:                while (len-- > 0) {
108:                    i = read();
109:                    if (i == -1)
110:                        return (ok == 0) ? -1 : ok;
111:                    b[off++] = (char) i;
112:                    ok++;
113:                }
114:                return ok;
115:            }
116:
117:            /** Reads from the stream into the provided array. */
118:            public int read(char[] b) {
119:                return read(b, 0, b.length);
120:            }
121:        }
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