// Copyright (c) Corporation for National Research Initiatives
package org.python.util;
import java.io.EOFException;
import java.io.IOException;
import org.gnu.readline.Readline;
import org.gnu.readline.ReadlineLibrary;
import org.python.core.Py;
import org.python.core.PyException;
import org.python.core.PyObject;
import org.python.core.PySystemState;
/**
* Uses: <a href="http://java-readline.sourceforge.net/">Java Readline</a> <p/>
*
* Based on CPython-1.5.2's code module
*
*/
public class ReadlineConsole extends InteractiveConsole {
public String filename;
public ReadlineConsole() {
this(null, CONSOLE_FILENAME);
}
public ReadlineConsole(PyObject locals) {
this(locals, CONSOLE_FILENAME);
}
public ReadlineConsole(PyObject locals, String filename) {
super(locals, filename, true);
String backingLib = PySystemState.registry.getProperty("python.console.readlinelib",
"Editline");
try {
Readline.load(ReadlineLibrary.byName(backingLib));
} catch(RuntimeException e) {
// Silently ignore errors during load of the native library.
// Will use a pure java fallback.
}
Readline.initReadline("jython");
try {
// Force rebind of tab to insert a tab instead of complete
Readline.parseAndBind("tab: tab-insert");
}
catch (UnsupportedOperationException uoe) {
// parseAndBind not supported by this readline
}
}
/**
* Write a prompt and read a line.
*
* The returned line does not include the trailing newline. When the user
* enters the EOF key sequence, EOFError is raised.
*
* This subclass implements the functionality using JavaReadline.
*/
public String raw_input(PyObject prompt) {
try {
String line = Readline.readline(prompt == null ? "" : prompt.toString());
return (line == null ? "" : line);
} catch(EOFException eofe) {
throw new PyException(Py.EOFError);
} catch(IOException ioe) {
throw new PyException(Py.IOError);
}
}
}