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samples/shell.js@b1a7da25b547 (annotated)

samples/shell.js

Wed, 27 Apr 2016 01:36:41 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:36:41 +0800

changeset 0

b1a7da25b547

child 952

6d5471a497fb

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/nashorn/
changeset: 1034:4b9cc65dd24d
tag: jdk8u25-b17

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