jlaskey@3: /*
sundar@851:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962:  *
jlaskey@3:  * Redistribution and use in source and binary forms, with or without
jlaskey@3:  * modification, are permitted provided that the following conditions
jlaskey@3:  * are met:
attila@962:  *
jlaskey@3:  *   - Redistributions of source code must retain the above copyright
jlaskey@3:  *     notice, this list of conditions and the following disclaimer.
attila@962:  *
jlaskey@3:  *   - Redistributions in binary form must reproduce the above copyright
jlaskey@3:  *     notice, this list of conditions and the following disclaimer in the
jlaskey@3:  *     documentation and/or other materials provided with the distribution.
attila@962:  *
jlaskey@3:  *   - Neither the name of Oracle nor the names of its
jlaskey@3:  *     contributors may be used to endorse or promote products derived
jlaskey@3:  *     from this software without specific prior written permission.
attila@962:  *
jlaskey@3:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
jlaskey@3:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
jlaskey@3:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
jlaskey@3:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
jlaskey@3:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
jlaskey@3:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
jlaskey@3:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
jlaskey@3:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
jlaskey@3:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
jlaskey@3:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
jlaskey@3:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jlaskey@3:  */
jlaskey@3: 
sundar@851: // Usage: jjs uniq.js
sundar@851: // or: jjs uniq.js -- <file>
jlaskey@3: 
sundar@851: // omit repeated lines and print unique lines
sundar@851: 
sundar@851: var BufferedReader = Java.type("java.io.BufferedReader");
sundar@851: var FileReader = Java.type("java.io.FileReader");
sundar@851: var InputStreamReader = Java.type("java.io.InputStreamReader");
sundar@851: var System = Java.type("java.lang.System");
sundar@851: 
sundar@851: // use object as set - but insertion order preserved
sundar@851: var uniqueLines = {};
sundar@851: var reader = arguments.length > 0 ?
sundar@851:     new FileReader(arguments[0])  :
sundar@851:     new InputStreamReader(System.in);
sundar@851: reader = new BufferedReader(reader);
sundar@851: 
sundar@851: // add unique lines
sundar@851: reader.lines().forEach(function(line) {
sundar@851:     uniqueLines[line] = true;
sundar@851: })
sundar@851: 
sundar@851: for (line in uniqueLines) {
sundar@851:     print(line);
jlaskey@3: }