/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package jdk.nashorn.tools;
import static jdk.nashorn.internal.lookup.Lookup.MH;
import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import jdk.nashorn.internal.runtime.JSType;
import jdk.nashorn.internal.runtime.ScriptingFunctions;
import jdk.nashorn.internal.objects.Global;
/**
* Global functions supported only in shell interactive mode.
*/
public final class ShellFunctions {
/** Handle to implementation of {@link ShellFunctions#input} - Nashorn extension */
public static final MethodHandle INPUT = findOwnMH("input", Object.class, Object.class, Object.class, Object.class);
/** Handle to implementation of {@link ShellFunctions#evalinput} - Nashorn extension */
public static final MethodHandle EVALINPUT = findOwnMH("evalinput", Object.class, Object.class, Object.class, Object.class);
private ShellFunctions() {
}
/**
* Nashorn extension: global.input (shell-interactive-mode-only)
* Read one or more lines of input from the standard input till the
* given end marker is seen in standard input.
*
* @param self self reference
* @param endMarker String used as end marker for input
* @param prompt String used as input prompt
*
* @return line that was read
*
* @throws IOException if an exception occurs
*/
public static Object input(final Object self, final Object endMarker, final Object prompt) throws IOException {
final String endMarkerStr = (endMarker != UNDEFINED)? JSType.toString(endMarker) : "";
final String promptStr = (prompt != UNDEFINED)? JSType.toString(prompt) : ">> ";
final StringBuilder buf = new StringBuilder();
while (true) {
final String line = ScriptingFunctions.readLine(promptStr);
if (line == null || line.equals(endMarkerStr)) {
break;
}
buf.append(line);
buf.append('\n');
}
return buf.toString();
}
/**
* Nashorn extension: Reads zero or more lines from standard input and
* evaluates the concatenated string as code
*
* @param self self reference
* @param endMarker String used as end marker for input
* @param prompt String used as input prompt
*
* @return output from evaluating the script
*
* @throws IOException if an exception occurs
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