001 /*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019 package org.crsh.lang.script;
020
021 import org.crsh.cli.impl.Delimiter;
022 import org.crsh.cli.impl.completion.CompletionMatch;
023 import org.crsh.cli.spi.Completion;
024 import org.crsh.shell.impl.command.RuntimeContextImpl;
025 import org.crsh.shell.impl.command.spi.CommandCreationException;
026 import org.crsh.shell.impl.command.spi.CommandInvoker;
027 import org.crsh.shell.impl.command.spi.ShellCommand;
028 import org.crsh.command.SyntaxException;
029 import org.crsh.repl.Repl;
030 import org.crsh.repl.ReplSession;
031 import org.crsh.shell.ErrorType;
032 import org.crsh.shell.ShellResponse;
033 import org.crsh.repl.EvalResponse;
034 import org.crsh.text.Chunk;
035 import org.crsh.util.Utils;
036
037 import java.util.logging.Level;
038 import java.util.logging.Logger;
039
040 /** @author Julien Viet */
041 public class ScriptRepl implements Repl {
042
043 /** . */
044 private static final ScriptRepl instance = new ScriptRepl();
045
046 /** . */
047 static final Logger log = Logger.getLogger(ScriptRepl.class.getName());
048
049 public static ScriptRepl getInstance() {
050 return instance;
051 }
052
053 private ScriptRepl() {
054 }
055
056 @Override
057 public boolean isActive() {
058 return true;
059 }
060
061 public String getName() {
062 return "script";
063 }
064
065 @Override
066 public String getDescription() {
067 return "The Script repl provides command line interpreter with a bash like syntax";
068 }
069
070 public EvalResponse eval(ReplSession session, String request) {
071 PipeLineFactory factory;
072 try {
073 factory = Token.parse(request).createFactory();
074 }
075 catch (SyntaxException e) {
076 return new EvalResponse.Response(ShellResponse.error(ErrorType.EVALUATION, e.getMessage()));
077 }
078 if (factory != null) {
079 try {
080 CommandInvoker<Void, Chunk> invoker = factory.create(session);
081 return new EvalResponse.Invoke(invoker);
082 }
083 catch (CommandCreationException e) {
084 log.log(Level.FINER, "Could not create command", e);
085 return new EvalResponse.Response(ShellResponse.unknownCommand(e.getCommandName()));
086 }
087 } else {
088 return new EvalResponse.Response(ShellResponse.noCommand());
089 }
090 }
091
092 public CompletionMatch complete(ReplSession session, String prefix) {
093 Token ast = Token.parse(prefix);
094 String termPrefix;
095 if (ast != null) {
096 Token last = ast.getLast();
097 termPrefix = Utils.trimLeft(last.value);
098 } else {
099 termPrefix = "";
100 }
101
102 //
103 log.log(Level.FINE, "Retained term prefix is " + termPrefix);
104 CompletionMatch completion;
105 int pos = termPrefix.indexOf(' ');
106 if (pos == -1) {
107 Completion.Builder builder = Completion.builder(termPrefix);
108 for (String name : session.getCommandNames()) {
109 if (name.startsWith(termPrefix)) {
110 builder.add(name.substring(termPrefix.length()), true);
111 }
112 }
113 completion = new CompletionMatch(Delimiter.EMPTY, builder.build());
114 } else {
115 String commandName = termPrefix.substring(0, pos);
116 termPrefix = termPrefix.substring(pos);
117 try {
118 ShellCommand<?> command = session.getCommand(commandName);
119 if (command != null) {
120 completion = command.complete(new RuntimeContextImpl(session, session.getContext().getAttributes()), termPrefix);
121 } else {
122 completion = new CompletionMatch(Delimiter.EMPTY, Completion.create());
123 }
124 }
125 catch (CommandCreationException e) {
126 log.log(Level.FINE, "Could not create command for completion of " + prefix, e);
127 completion = new CompletionMatch(Delimiter.EMPTY, Completion.create());
128 }
129 }
130
131 //
132 return completion;
133 }
134 }