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Common infrastructure to create language launchers using the Polyglot API.
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/*
* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.graalvm.launcher;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Language;
import org.graalvm.polyglot.PolyglotException;
import org.graalvm.polyglot.Source;
import org.graalvm.polyglot.PolyglotException.StackFrame;
import jline.console.ConsoleReader;
import jline.console.UserInterruptException;
import jline.console.history.History;
import jline.console.history.MemoryHistory;
import jline.internal.NonBlockingInputStream;
class MultiLanguageShell {
private final Map histories = new HashMap<>();
private final Context context;
private final InputStream in;
private final OutputStream out;
private final String defaultStartLanguage;
MultiLanguageShell(Context context, InputStream in, OutputStream out, String defaultStartLanguage) {
this.context = context;
this.in = in;
this.out = out;
this.defaultStartLanguage = defaultStartLanguage;
}
public int readEvalPrint() throws IOException {
ConsoleReader console = new ConsoleReader(in, out);
console.setHandleUserInterrupt(true);
console.setExpandEvents(false);
console.setCopyPasteDetection(true);
console.println("GraalVM MultiLanguage Shell " + context.getEngine().getVersion());
console.println("Copyright (c) 2013-2018, Oracle and/or its affiliates");
List languages = new ArrayList<>();
Set uniqueValues = new HashSet<>();
for (Language language : context.getEngine().getLanguages().values()) {
if (language.isInteractive()) {
if (uniqueValues.add(language)) {
languages.add(language);
}
}
}
languages.sort(Comparator.comparing(Language::getName));
Map prompts = new HashMap<>();
StringBuilder promptsString = new StringBuilder();
for (Language language : languages) {
String prompt = createPrompt(language).trim();
promptsString.append(prompt).append(" ");
prompts.put(prompt, language);
console.println(" " + language.getName() + " version " + language.getVersion());
}
if (languages.isEmpty()) {
throw new Launcher.AbortException("Error: No Graal languages installed. Exiting shell.", 1);
}
printUsage(console, promptsString, false);
int maxNameLength = 0;
for (Language language : languages) {
maxNameLength = Math.max(maxNameLength, language.getName().length());
}
String startLanguage = defaultStartLanguage;
if (startLanguage == null) {
startLanguage = languages.get(0).getId();
}
Language currentLanguage = context.getEngine().getLanguages().get(startLanguage);
if (currentLanguage == null) {
throw new Launcher.AbortException("Error: could not find language '" + startLanguage + "'", 1);
}
assert languages.indexOf(currentLanguage) >= 0;
Source bufferSource = null;
String id = currentLanguage.getId();
// console.println("initialize time: " + (System.currentTimeMillis() - start));
String prompt = createPrompt(currentLanguage);
console.getKeys().bind(String.valueOf((char) 12), new ActionListener() {
public void actionPerformed(ActionEvent e) {
throw new ChangeLanguageException(null);
}
});
console.getKeys().bind(String.valueOf((char) 10), new ActionListener() {
public void actionPerformed(ActionEvent e) {
throw new RuntimeIncompleteSourceException();
}
});
// initializes the language
context.initialize(currentLanguage.getId());
boolean verboseErrors = false;
for (;;) {
String input = null;
Source source = null;
try {
input = console.readLine(bufferSource == null ? prompt : createBufferPrompt(prompt));
if (input == null) {
break;
} else if (input.trim().equals("")) {
continue;
}
Language switchedLanguage = null;
String trimmedInput = input.trim();
if (trimmedInput.equals("-usage")) {
printUsage(console, promptsString, true);
input = "";
} else if (trimmedInput.equals("-verboseErrors")) {
verboseErrors = !verboseErrors;
if (verboseErrors) {
console.println("Verbose errors is now on.");
} else {
console.println("Verbose errors is now off.");
}
input = "";
} else if (prompts.containsKey(trimmedInput)) {
switchedLanguage = prompts.get(input);
input = "";
}
NonBlockingInputStream nonBlockIn = ((NonBlockingInputStream) console.getInput());
while (nonBlockIn.isNonBlockingEnabled() && nonBlockIn.peek(10) != -2 && switchedLanguage == null) {
String line = console.readLine(createBufferPrompt(prompt));
String trimmedLine = line.trim();
if (prompts.containsKey(trimmedLine)) {
switchedLanguage = prompts.get(trimmedLine);
break;
} else {
input += "\n" + line;
}
}
if (!input.trim().equals("")) {
source = Source.newBuilder(currentLanguage.getId(), input, "").interactive(true).build();
context.eval(source);
bufferSource = null;
console.getHistory().replace(source.getCharacters());
}
if (switchedLanguage != null) {
throw new ChangeLanguageException(switchedLanguage);
}
} catch (UserInterruptException | EOFException e) {
// interrupted by ctrl-c
break;
} catch (ChangeLanguageException e) {
bufferSource = null;
histories.put(currentLanguage, console.getHistory());
currentLanguage = e.getLanguage() == null ? languages.get((languages.indexOf(currentLanguage) + 1) % languages.size()) : e.getLanguage();
History history = histories.computeIfAbsent(currentLanguage, k -> new MemoryHistory());
console.setHistory(history);
id = currentLanguage.getId();
prompt = createPrompt(currentLanguage);
console.resetPromptLine("", "", 0);
context.initialize(id);
} catch (PolyglotException e) {
bufferSource = null;
if (e.isInternalError()) {
console.println("Internal error occured: " + e.toString());
if (verboseErrors) {
e.printStackTrace(new PrintWriter(console.getOutput()));
} else {
console.println("Run with --verbose to see the full stack trace.");
}
} else if (e.isExit()) {
return e.getExitStatus();
} else if (e.isCancelled()) {
console.println("Execution got cancelled.");
} else if (e.isIncompleteSource()) {
console.println();
bufferSource = source;
} else if (e.isSyntaxError()) {
console.println(e.getMessage());
} else {
List trace = new ArrayList<>();
for (StackFrame stackFrame : e.getPolyglotStackTrace()) {
trace.add(stackFrame);
}
// remove trailing host frames
for (int i = trace.size() - 1; i >= 0; i--) {
if (trace.get(i).isHostFrame()) {
trace.remove(i);
} else {
break;
}
}
if (e.isHostException()) {
console.println(e.asHostException().toString());
} else {
console.println(e.getMessage());
}
// no need to print stack traces with single entry
if (trace.size() > 1) {
for (StackFrame stackFrame : trace) {
console.print(" at ");
console.println(stackFrame.toString());
}
}
}
} catch (Throwable e) {
console.println("Internal error occured: " + e.toString());
if (verboseErrors) {
e.printStackTrace(new PrintWriter(console.getOutput()));
} else {
console.println("Run with --verbose to see the full stack trace.");
}
}
}
return 0;
}
private static void printUsage(ConsoleReader console, StringBuilder promptsString, boolean showCommands) throws IOException {
if (showCommands) {
console.println("Commands:");
console.println(" -usage to show this list.");
console.println(" -verboseErrors to toggle verbose error messages (default off).");
console.println(" " + promptsString + " to switch to a language.");
} else {
console.println("Usage: ");
console.println(" Use Ctrl+L to switch language and Ctrl+D to exit.");
console.println(" Enter -usage to get a list of available commands.");
}
}
@SuppressWarnings("serial")
private static class RuntimeIncompleteSourceException extends RuntimeException {
@Override
public synchronized Throwable fillInStackTrace() {
return this;
}
}
@SuppressWarnings("serial")
private static class ChangeLanguageException extends RuntimeException {
private final Language language;
ChangeLanguageException(Language language) {
this.language = language;
}
public Language getLanguage() {
return language;
}
@Override
public synchronized Throwable fillInStackTrace() {
return this;
}
}
private static String createBufferPrompt(String prompt) {
StringBuilder b = new StringBuilder();
for (int i = 0; i < prompt.length() - 2; i++) {
b.append(" ");
}
return b.append("+ ").toString();
}
private static String createPrompt(Language currentLanguage) {
return String.format("%s> ", currentLanguage.getId());
}
}