Naive, but functional interactive javascript shell with Java 6.<\/p>\n
[code lang=”java”]
\npackage org.kari.test.script;<\/p>\n
import java.io.BufferedReader;
\nimport java.io.InputStream;
\nimport java.io.InputStreamReader;
\nimport java.io.PrintStream;<\/p>\n
import javax.script.ScriptEngine;
\nimport javax.script.ScriptEngineManager;
\nimport javax.script.ScriptException;<\/p>\n
import org.apache.log4j.Logger;
\nimport org.kari.log.LogUtil;<\/p>\n
\/**
\n * Test interactive javascript shell
\n *
\n * @author kari
\n *\/
\npublic class ScriptShell {
\n public static final Logger LOG = LogUtil.getLogger(”script.shell”);<\/p>\n
private final ScriptEngine mEngine;
\n private InputStream mIn = System.in;
\n private PrintStream mOut = System.out;
\n private PrintStream mErr = System.err;<\/p>\n
private ScriptShell() {
\n ScriptEngineManager manager = new ScriptEngineManager();
\n mEngine = manager.getEngineByName(”js”);
\n }<\/p>\n
public void run()
\n throws Exception
\n {
\n BufferedReader in = new BufferedReader(new InputStreamReader(mIn));
\n StringBuilder sb = new StringBuilder();
\n while (true) {
\n if (sb.length() == 0) {
\n mOut.print(”\\njs> ”);
\n mOut.flush();
\n }<\/p>\n
String line = in.readLine();
\n if (line == null) {
\n break;
\n }
\n sb.append(line);
\n sb.append(’\\n’);<\/p>\n
String expr = sb.toString();<\/p>\n
try {
\n mEngine.put(”javax.script.filename”, ””);
\n Object result = mEngine.eval(expr);
\n if (result != null) {
\n printOut(result);
\n }
\n sb.setLength(0);
\n } catch (Exception e) {
\n String msg = e.getMessage();
\n boolean missing = false;
\n if (e instanceof ScriptException) {
\n missing = msg.indexOf(”missing”) != -1
\n || msg.indexOf(”Unexpected end of file”) != -1;
\n if (expr.endsWith(”;;\\n”)) {
\n missing = false;
\n }
\n }<\/p>\n
if (!missing) {
\n sb.setLength(0);
\n LOG.error(”Failed”, e);
\n printErr(msg);
\n }
\n } finally {
\n flushOutErr();
\n }
\n }
\n }<\/p>\n
private void printErr(String msg) {
\n flushOutErr();
\n mErr.println(”FAIL: ” + msg);
\n flushOutErr();
\n }<\/p>\n
private void printOut(Object result) {
\n flushOutErr();
\n mOut.println(result);
\n flushOutErr();
\n }<\/p>\n
private void flushOutErr() {
\n mOut.flush();
\n mErr.flush();
\n }<\/p>\n
public static void main(String[] args) {
\n try {
\n ScriptShell shell = new ScriptShell();
\n shell.run();
\n } catch (Exception e) {
\n LOG.error(”failed”, e);
\n }
\n }
\n}
\n[\/code]<\/p>\n
Sample session from the shell:<\/p>\n
[code]
\njs> function bar(arg) {
\n return arg * arg
\n}<\/p>\n
js> for (i = 0; i < 10; i++) {\nprintln(bar(i))\n}\n0\n1\n4\n9\n16\n25\n36\n49\n64\n81\n\njs>
\n[\/code]<\/p>\n","protected":false},"excerpt":{"rendered":"
Naive, but functional interactive javascript shell with Java 6. [code lang=”java”] package org.kari.test.script; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintStream; import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; import org.apache.log4j.Logger; import org.kari.log.LogUtil; \/** * Test interactive javascript shell * * @author kari *\/ public class ScriptShell { public static final Logger LOG = LogUtil.getLogger(”script.shell”); private final…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-253","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=\/wp\/v2\/posts\/253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=253"}],"version-history":[{"count":0,"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=\/wp\/v2\/posts\/253\/revisions"}],"wp:attachment":[{"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=253"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=253"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kari.world.ikari.fi\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}