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samples/shell.js@2f1b9f4daec1 (annotated)

samples/shell.js

Fri, 05 Jun 2015 12:38:53 +0200

author

mhaupt

date

Fri, 05 Jun 2015 12:38:53 +0200

changeset 1398

2f1b9f4daec1

parent 1239

e1146c9cc758

child 1490

d85f981c8cf8

permissions

-rw-r--r--

8080087: Nashorn $ENV.PWD is originally undefined
Summary: On Windows, the PWD environment variable does not exist and cannot be imported in scripting mode, so it is set explicitly.
Reviewed-by: lagergren, sundar

jlaskey@3	1	/*
sundar@851	2	* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962	3	*
jlaskey@3	4	* Redistribution and use in source and binary forms, with or without
jlaskey@3	5	* modification, are permitted provided that the following conditions
jlaskey@3	6	* are met:
attila@962	7	*
jlaskey@3	8	* - Redistributions of source code must retain the above copyright
jlaskey@3	9	* notice, this list of conditions and the following disclaimer.
attila@962	10	*
jlaskey@3	11	* - Redistributions in binary form must reproduce the above copyright
jlaskey@3	12	* notice, this list of conditions and the following disclaimer in the
jlaskey@3	13	* documentation and/or other materials provided with the distribution.
attila@962	14	*
jlaskey@3	15	* - Neither the name of Oracle nor the names of its
jlaskey@3	16	* contributors may be used to endorse or promote products derived
jlaskey@3	17	* from this software without specific prior written permission.
attila@962	18	*
jlaskey@3	19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
jlaskey@3	20	* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
jlaskey@3	21	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
jlaskey@3	22	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
jlaskey@3	23	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
jlaskey@3	24	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
jlaskey@3	25	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
jlaskey@3	26	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
jlaskey@3	27	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
jlaskey@3	28	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
jlaskey@3	29	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jlaskey@3	30	*/
jlaskey@3	31
sundar@851	32	// Usage: jjs shell.js
sundar@851	33
sundar@851	34	/* This is a simple shell tool in JavaScript.
jlaskey@3	35	*
jlaskey@3	36	* Runs any operating system command using Java "exec". When "eval" command is
jlaskey@3	37	* used, evaluates argument(s) as JavaScript code.
jlaskey@3	38	*/
jlaskey@3	39
sundar@851	40	(function() {
sundar@851	41	// Java classes used
sundar@851	42	var Arrays = Java.type("java.util.Arrays");
sundar@851	43	var BufferedReader = Java.type("java.io.BufferedReader");
sundar@851	44	var InputStreamReader = Java.type("java.io.InputStreamReader");
sundar@851	45	var ProcessBuilder = Java.type("java.lang.ProcessBuilder");
sundar@851	46	var System = Java.type("java.lang.System");
jlaskey@3	47
sundar@851	48	// print prompt
sundar@851	49	function prompt() {
sundar@851	50	System.out.print("> ");
sundar@851	51	}
jlaskey@3	52
sundar@851	53	var reader = new BufferedReader(new InputStreamReader(System.in));
jlaskey@3	54	prompt();
sundar@851	55	// read and evaluate each line from stdin
sundar@851	56	reader.lines().forEach(function(line) {
sundar@851	57	if (! line.isEmpty()) {
sundar@851	58	var args = line.split(' ');
jlaskey@3	59	try {
sundar@851	60	// special 'eval' command to evaluate JS code
sundar@851	61	if (args[0] == 'eval') {
sundar@851	62	var code = line.substring('eval'.length);
jlaskey@3	63	var res = eval(code);
jlaskey@3	64	if (res != undefined) {
jlaskey@3	65	print(res);
jlaskey@3	66	}
jlaskey@3	67	} else {
sundar@851	68	// build child process and start it!
attila@1239	69	new ProcessBuilder(Arrays.asList(args))
sundar@851	70	.inheritIO()
sundar@851	71	.start()
sundar@851	72	.waitFor();
jlaskey@3	73	}
jlaskey@3	74	} catch (e) {
sundar@851	75	// print exception, if any
jlaskey@3	76	print(e);
jlaskey@3	77	}
jlaskey@3	78	}
jlaskey@3	79	prompt();
sundar@851	80	})
sundar@851	81	})()