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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.karaf.shell.compat;
import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.felix.gogo.commands.Action;
import org.apache.felix.service.command.CommandSession;
import org.apache.karaf.shell.commands.Argument;
import org.apache.karaf.shell.commands.CommandWithAction;
import org.apache.karaf.shell.commands.CompleterValues;
import org.apache.karaf.shell.commands.HelpOption;
import org.apache.karaf.shell.commands.Option;
import org.apache.karaf.shell.console.CommandSessionHolder;
import org.apache.karaf.shell.console.CompletableFunction;
import org.apache.karaf.shell.console.Completer;
import org.apache.karaf.shell.console.completer.FileCompleter;
import org.apache.karaf.shell.console.completer.NullCompleter;
import org.apache.karaf.shell.console.completer.StringsCompleter;
import org.apache.karaf.shell.api.console.CommandLine;
import org.apache.karaf.shell.api.console.Session;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ArgumentCompleter {
private static final Logger LOGGER = LoggerFactory.getLogger(ArgumentCompleter.class);
public static final String ARGUMENTS_LIST = "ARGUMENTS_LIST";
public static final String COMMANDS = ".commands";
final String scope;
final String name;
final Completer commandCompleter;
final Completer optionsCompleter;
final List argsCompleters;
final Map optionalCompleters;
final CommandWithAction function;
final Map fields = new HashMap<>();
final Map options = new HashMap<>();
final Map arguments = new HashMap<>();
boolean strict = true;
@SuppressWarnings({ "unchecked", "rawtypes" })
public ArgumentCompleter(CommandWithAction function, String scope, String name, boolean scoped) {
this.function = function;
this.scope = scope;
this.name = name;
// Command name completer
String[] names = scoped ? new String[] { name } : new String[] { name, scope + ":" + name };
commandCompleter = new StringsCompleter(names);
// Build options completer
for (Class type = function.getActionClass(); type != null; type = type.getSuperclass()) {
for (Field field : type.getDeclaredFields()) {
Option option = field.getAnnotation(Option.class);
if (option != null) {
fields.put(option, field);
options.put(option.name(), option);
String[] aliases = option.aliases();
if (aliases != null) {
for (String alias : aliases) {
options.put(alias, option);
}
}
}
Argument argument = field.getAnnotation(Argument.class);
if (argument != null) {
Integer key = argument.index();
if (arguments.containsKey(key)) {
LOGGER.warn("Duplicate @Argument annotations on class " + type.getName() + " for index: " + key + " see: " + field);
} else {
arguments.put(key, field);
}
}
}
}
options.put(HelpOption.HELP.name(), HelpOption.HELP);
optionsCompleter = new StringsCompleter(options.keySet());
// Build arguments completers
List argsCompleters = null;
Map optionalCompleters = null;
if (function instanceof CompletableFunction) {
Map focl = ((CompletableFunction) function).getOptionalCompleters();
List fcl = ((CompletableFunction) function).getCompleters();
if (focl != null || fcl != null) {
argsCompleters = new ArrayList<>();
if (fcl != null) {
for (Completer c : fcl) {
argsCompleters.add(c == null ? NullCompleter.INSTANCE : c);
}
}
optionalCompleters = focl;
}
}
if (argsCompleters == null) {
final Map values = getCompleterValues(function);
argsCompleters = new ArrayList<>();
boolean multi = false;
for (int key = 0; key < arguments.size(); key++) {
Completer completer = null;
Field field = arguments.get(key);
if (field != null) {
Argument argument = field.getAnnotation(Argument.class);
multi = (argument != null && argument.multiValued());
org.apache.karaf.shell.commands.Completer ann = field.getAnnotation(org.apache.karaf.shell.commands.Completer.class);
if (ann != null) {
Class clazz = ann.value();
String[] value = ann.values();
if (clazz != null) {
if (value.length > 0 && clazz == StringsCompleter.class) {
completer = new StringsCompleter(value, ann.caseSensitive());
} else {
BundleContext context = FrameworkUtil.getBundle(function.getClass()).getBundleContext();
completer = new ProxyServiceCompleter(context, clazz);
}
}
} else if (values.containsKey(key)) {
Object value = values.get(key);
if (value instanceof String[]) {
completer = new StringsCompleter((String[]) value);
} else if (value instanceof Collection) {
completer = new StringsCompleter((Collection) value);
} else {
LOGGER.warn("Could not use value " + value + " as set of completions!");
}
} else {
completer = getDefaultCompleter(field);
}
}
if (completer == null) {
completer = NullCompleter.INSTANCE;
}
argsCompleters.add(completer);
}
if (argsCompleters.isEmpty() || !multi) {
argsCompleters.add(NullCompleter.INSTANCE);
}
optionalCompleters = new HashMap<>();
for (Option option : fields.keySet()) {
Completer completer = null;
Field field = fields.get(option);
if (field != null) {
org.apache.karaf.shell.commands.Completer ann = field.getAnnotation(org.apache.karaf.shell.commands.Completer.class);
if (ann != null) {
Class clazz = ann.value();
String[] value = ann.values();
if (clazz != null) {
if (value.length > 0 && clazz == StringsCompleter.class) {
completer = new StringsCompleter(value, ann.caseSensitive());
} else {
BundleContext context = FrameworkUtil.getBundle(function.getClass()).getBundleContext();
completer = new ProxyServiceCompleter(context, clazz);
}
}
}
}
if (completer == null) {
completer = NullCompleter.INSTANCE;
}
optionalCompleters.put(option.name(), completer);
if (option.aliases() != null) {
for (String alias : option.aliases()) {
optionalCompleters.put(alias, completer);
}
}
}
}
this.argsCompleters = argsCompleters;
this.optionalCompleters = optionalCompleters;
}
private Map getCompleterValues(CommandWithAction function) {
final Map values = new HashMap<>();
Action action = null;
try {
for (Class type = function.getActionClass(); type != null; type = type.getSuperclass()) {
for (Method method : type.getDeclaredMethods()) {
CompleterValues completerMethod = method.getAnnotation(CompleterValues.class);
if (completerMethod != null) {
int index = completerMethod.index();
Integer key = index;
if (index >= arguments.size() || index < 0) {
LOGGER.warn("Index out of range on @CompleterValues on class " + type.getName() + " for index: " + key + " see: " + method);
} else if (values.containsKey(key)) {
LOGGER.warn("Duplicate @CompleterMethod annotations on class " + type.getName() + " for index: " + key + " see: " + method);
} else {
try {
Object value;
if (Modifier.isStatic(method.getModifiers())) {
value = method.invoke(null);
} else {
if (action == null) {
action = function.createNewAction();
}
value = method.invoke(action);
}
values.put(key, value);
} catch (IllegalAccessException e) {
LOGGER.warn("Could not invoke @CompleterMethod on " + function + ". " + e, e);
} catch (InvocationTargetException e) {
Throwable target = e.getTargetException();
if (target == null) {
target = e;
}
LOGGER.warn("Could not invoke @CompleterMethod on " + function + ". " + target, target);
}
}
}
}
}
} finally {
if (action != null) {
try {
function.releaseAction(action);
} catch (Exception e) {
LOGGER.warn("Failed to release action: " + action + ". " + e, e);
}
}
}
return values;
}
private Completer getDefaultCompleter(Field field) {
Completer completer = null;
Class type = field.getType();
if (type.isAssignableFrom(File.class)) {
completer = new FileCompleter(null);
} else if (type.isAssignableFrom(Boolean.class) || type.isAssignableFrom(boolean.class)) {
completer = new StringsCompleter(new String[] {"false", "true"}, false);
} else if (type.isAssignableFrom(Enum.class)) {
Set values = new HashSet<>();
for (Object o : EnumSet.allOf((Class) type)) {
values.add(o.toString());
}
completer = new StringsCompleter(values, false);
} else {
// TODO any other completers we can add?
}
return completer;
}
/**
* If true, a completion at argument index N will only succeed
* if all the completions from 0-(N-1) also succeed.
*
* @param strict The new value of the strict flag.
*/
public void setStrict(final boolean strict) {
this.strict = strict;
}
/**
* Return whether a completion at argument index N will success
* if all the completions from arguments 0-(N-1) also succeed.
*
* @return The value of the strict flag.
*/
public boolean getStrict() {
return this.strict;
}
public int complete(final Session session, final CommandLine list, final List candidates) {
int argpos = list.getArgumentPosition();
int argIndex = list.getCursorArgumentIndex();
//Store the argument list so that it can be used by completers.
CommandSession commandSession = CommandSessionHolder.getSession();
if(commandSession != null) {
commandSession.put(ARGUMENTS_LIST,list);
}
Completer comp = null;
String[] args = list.getArguments();
int index = 0;
// First argument is command name
if (index < argIndex) {
// Verify scope
if (!Session.SCOPE_GLOBAL.equals(scope) && !session.resolveCommand(args[index]).equals(scope + ":" + name)) {
return -1;
}
// Verify command name
if (!verifyCompleter(commandCompleter, args[index])) {
return -1;
}
index++;
} else {
comp = commandCompleter;
}
// Now, check options
if (comp == null) {
while (index < argIndex && args[index].startsWith("-")) {
if (!verifyCompleter(optionsCompleter, args[index])) {
return -1;
}
Option option = options.get(args[index]);
if (option == null) {
return -1;
}
Field field = fields.get(option);
if (field != null && field.getType() != boolean.class && field.getType() != Boolean.class) {
if (++index == argIndex) {
comp = NullCompleter.INSTANCE;
}
}
index++;
}
if (comp == null && index >= argIndex && index < args.length && args[index].startsWith("-")) {
comp = optionsCompleter;
}
}
//Now check for if last Option has a completer
int lastAgurmentIndex = argIndex - 1;
if (lastAgurmentIndex >= 1) {
Option lastOption = options.get(args[lastAgurmentIndex]);
if (lastOption != null) {
Field lastField = fields.get(lastOption);
if (lastField != null && lastField.getType() != boolean.class && lastField.getType() != Boolean.class) {
Option option = lastField.getAnnotation(Option.class);
if (option != null) {
Completer optionValueCompleter = null;
String name = option.name();
if (optionalCompleters != null && name != null) {
optionValueCompleter = optionalCompleters.get(name);
if (optionValueCompleter == null) {
String[] aliases = option.aliases();
if (aliases.length > 0) {
for (int i = 0; i < aliases.length && optionValueCompleter == null; i++) {
optionValueCompleter = optionalCompleters.get(option.aliases()[i]);
}
}
}
}
if(optionValueCompleter != null) {
comp = optionValueCompleter;
}
}
}
}
}
// Check arguments
if (comp == null) {
int indexArg = 0;
while (index < argIndex) {
Completer sub = argsCompleters.get(indexArg >= argsCompleters.size() ? argsCompleters.size() - 1 : indexArg);
if (!verifyCompleter(sub, args[index])) {
return -1;
}
index++;
indexArg++;
}
comp = argsCompleters.get(indexArg >= argsCompleters.size() ? argsCompleters.size() - 1 : indexArg);
}
int ret = comp.complete(list.getCursorArgument(), argpos, candidates);
if (ret == -1) {
return -1;
}
int pos = ret + (list.getBufferPosition() - argpos);
/**
* Special case: when completing in the middle of a line, and the
* area under the cursor is a delimiter, then trim any delimiters
* from the candidates, since we do not need to have an extra
* delimiter.
*
* E.g., if we have a completion for "foo", and we
* enter "f bar" into the buffer, and move to after the "f"
* and hit TAB, we want "foo bar" instead of "foo bar".
*/
String buffer = list.getBuffer();
int cursor = list.getBufferPosition();
if ((buffer != null) && (cursor != buffer.length()) && isDelimiter(buffer, cursor)) {
for (int i = 0; i < candidates.size(); i++) {
String val = candidates.get(i);
while ((val.length() > 0)
&& isDelimiter(val, val.length() - 1)) {
val = val.substring(0, val.length() - 1);
}
candidates.set(i, val);
}
}
return pos;
}
protected boolean verifyCompleter(Completer completer, String argument) {
List candidates = new ArrayList<>();
return completer.complete(argument, argument.length(), candidates) != -1 && !candidates.isEmpty();
}
/**
* Return true if the specified character is a whitespace
* parameter. Check to ensure that the character is not
* escaped and returns true from
* {@link #isDelimiterChar}.
*
* @param buffer The complete command buffer.
* @param pos The index of the character in the buffer.
* @return True if the character should be a delimiter, false else.
*/
public boolean isDelimiter(final String buffer, final int pos) {
return !isEscaped(buffer, pos) && isDelimiterChar(buffer, pos);
}
public boolean isEscaped(final String buffer, final int pos) {
return pos > 0 && buffer.charAt(pos) == '\\' && !isEscaped(buffer, pos - 1);
}
/**
* The character is a delimiter if it is whitespace, and the
* preceding character is not an escape character.
*
* @param buffer The complete command buffer.
* @param pos The index of the character in the buffer.
* @return True if the character is a delimiter, false else.
*/
public boolean isDelimiterChar(String buffer, int pos) {
return Character.isWhitespace(buffer.charAt(pos));
}
public static class ProxyServiceCompleter implements Completer {
private final BundleContext context;
private final Class clazz;
public ProxyServiceCompleter(BundleContext context, Class clazz) {
this.context = context;
this.clazz = clazz;
}
@Override
public int complete(String buffer, int cursor, List candidates) {
ServiceReference ref = context.getServiceReference(clazz);
if (ref != null) {
Completer completer = context.getService(ref);
if (completer != null) {
try {
return completer.complete(buffer, cursor, candidates);
} finally {
context.ungetService(ref);
}
}
}
return -1;
}
}
}
