/**
* Copyright (c) 2014, the Temporal Random Indexing AUTHORS.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the University of Bari nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* GNU GENERAL PUBLIC LICENSE - Version 3, 29 June 2007
*
*/
package di.uniba.it.tri.shell;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.cli.BasicParser;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
/**
* Interactive command line tool
*
*/
public class TriShell {
private static final int HISTORY_COUNT = 100;
private static final String PROMPT = "TRI";
private InputStream in = System.in;
private BufferedReader reader;
private final List<String> history = new ArrayList();
private CommandWrapper command;
/**
*
*/
public static final String VERSION = "0.60";
private String charset = "ISO-8859-1";
/**
* The output stream where this tool writes to.
*/
public static PrintStream out = System.out;
/**
* Sets the standard output stream.
*
* @param out the new standard output stream
*/
public void setOut(PrintStream out) {
TriShell.out = out;
}
/**
* Set the class used as the wrapper to interpret and execute commands from
* the shell
*
* @return The class used as the wrapper to interpret and execute commands
* from the shell
*/
public CommandWrapper getCommandWrapper() {
return command;
}
/**
* Get the class used as the wrapper to interpret and execute commands from
* the shell
*
* @param command The class used as the wrapper to interpret and execute
* commands from the shell
*/
public void setCommandWrapper(CommandWrapper command) {
this.command = command;
}
/**
* Create a new shell given the charset
*
* @param charset The charset
*/
public TriShell(String charset) {
this.charset = charset;
}
/**
* Create a new shell
*/
public TriShell() {
}
static Options options;
static CommandLineParser cmdParser = new BasicParser();
static {
options = new Options();
options.addOption("c", true, "The charset used by the shell (optional)");
}
/**
* Run the TRI shell
*
* @param args the command line arguments
*/
public static void main(String[] args) {
try {
CommandLine cmd = cmdParser.parse(options, args);
TriShell shell = null;
if (cmd.hasOption("c")) {
shell = new TriShell(cmd.getOptionValue("c"));
} else {
shell = new TriShell();
}
CommandWrapper command = new CommandWrapper();
shell.setCommandWrapper(command);
shell.promptLoop();
} catch (ParseException ex) {
Logger.getLogger(TriShell.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
*
* @param errorMsg
*/
public static void printMessageError(String errorMsg) {
println("Error: " + errorMsg);
}
/**
*
* @param ex
*/
public static void printException(Exception ex) {
printMessageError(ex.getMessage());
}
/**
* Redirects the standard input. By default, System.in is used.
*
* @param in the input stream to use
*/
public void setIn(InputStream in) {
this.in = in;
}
/**
* Redirects the standard input. By default, System.in is used.
*
* @param reader the input stream reader to use
*/
public void setInReader(BufferedReader reader) {
this.reader = reader;
}
private void showHelp() {
println("Commands are case sensitive");
println("help or ? Display this help");
println("help or ? <command> Display the help of the specified <command>");
println("help or ? * Display the help of all commands");
println("history Show the last 100 statements");
println("quit or exit Close and exit");
println("");
}
private void promptLoop() {
println("");
println("*** Welcome to Temporal Random Indexing (TRI) Shell " + VERSION + " ***");
println("Shell charset: " + charset);
println("");
showHelp();
if (reader == null) {
try {
reader = new BufferedReader(new InputStreamReader(in, charset));
} catch (UnsupportedEncodingException ex) {
Logger.getLogger(TriShell.class.getName()).log(Level.SEVERE, null, ex);
}
}
while (true) {
try {
print(PROMPT + "> ");
String line = readLine();
if (line == null) {
break;
}
String trimmed = line.trim();
if (trimmed.length() == 0) {
continue;
}
String cmd = trimmed.replaceAll("\\s+", " "); //remove not necessary whitespaces
if ("exit".equals(cmd) || "quit".equals(cmd)) {
break;
} else if (cmd.matches("(^(help|\\?)$)|(^(help|\\?)\\s+.*$)")) {
String[] split = cmd.split("\\s+");
if (split.length == 1) {
showHelp();
} else {
command.help(split[1]);
}
} else if ("history".equals(cmd)) {
for (int i = 0, size = history.size(); i < size; i++) {
String s = history.get(i);
s = s.replace('\n', ' ').replace('\r', ' ');
println("#" + (1 + i) + ": " + s);
}
if (history.size() > 0) {
println("To re-run a statement, type runh and the number and press enter");
} else {
println("No history");
}
} else if (cmd.matches("(^runh$)|(^runh\\s+.*$)")) {
String[] split = cmd.split("\\s+");
if (split.length > 1) {
if (split[1].matches("[0-9]+")) {
int hi = Integer.parseInt(split[1]);
hi--;
if (hi < history.size()) {
executeCommand(history.get(hi));
} else {
printMessageError("No valid command number");
}
} else {
printMessageError("No valid command number");
}
} else {
printMessageError("runh syntax error");
}
} else {
executeCommand(cmd);
}
} catch (IOException | NumberFormatException ex) {
println("No managed exception sorry...");
printException(ex);
exit(1);
}
}
exit(0);
}
private void executeCommand(String cmd) {
try {
command.executeCommand(cmd);
} catch (Exception ex) {
printException(ex);
}
if (history.size() == HISTORY_COUNT) {
history.remove(0);
}
history.add(cmd);
}
/**
* Print the string without newline, and flush.
*
* @param s the string to print
*/
public static void print(String s) {
out.print(s);
out.flush();
}
/**
*
* @param s
*/
public static void println(String s) {
out.println(s);
out.flush();
}
private String readLine(String defaultValue) throws IOException {
String s = readLine();
return s.length() == 0 ? defaultValue : s;
}
private String readLine() throws IOException {
String line = reader.readLine();
if (line == null) {
throw new IOException("Aborted");
}
return line;
}
private void exit(int code) {
if (command != null) {
try {
command.close();
} catch (Exception ex) {
printException(ex);
System.exit(1);
}
}
System.err.println("Goodbye!");
System.exit(code);
}
}