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com.aspectran.shell.command.option.DefaultOptionParser Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2019 The Aspectran Project
*
* Licensed 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 com.aspectran.shell.command.option;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Properties;
/**
* The default command option parser.
*/
public class DefaultOptionParser implements OptionParser {
/** The parsed options instance. */
private ParsedOptions parsedOptions;
/** The current options. */
private Options options;
/**
* Flag indicating how unrecognized tokens are handled. {@code true} to stop
* the parsing and add the remaining tokens to the args list.
* {@code false} to throw an exception.
*/
private boolean skipParsingAtNonOption;
/** The token currently processed. */
private String currentToken;
/** The last option parsed. */
private Option currentOption;
/** The required options and groups expected to be found when parsing the command line. */
private List expectedOpts;
/** Flag indicating if partial matching of long options is supported. */
private boolean allowPartialMatching;
/**
* Creates a new DefaultParser instance with partial matching enabled.
*
* By "partial matching" we mean that given the following code:
*
* {@code
* Options options = new Options();
* options.addOption(new Option("d", "debug", false, "Turn on debug."));
* options.addOption(new Option("e", "extract", false, "Turn on extract."));
* options.addOption(new Option("o", "option", true, "Turn on option with argument."));
* }
*
* with "partial matching" turned on, {@code -de} only matches the
* {@code "debug"} option. However, with "partial matching" disabled,
* {@code -de} would enable both {@code debug} as well as
* {@code extract} options.
*/
public DefaultOptionParser() {
this(false);
}
/**
* Create a new DefaultParser instance with the specified partial matching policy.
*
* By "partial matching" we mean that given the following code:
*
* {@code
* Options options = new Options();
* options.addOption(new Option("d", "debug", false, "Turn on debug."));
* options.addOption(new Option("e", "extract", false, "Turn on extract."));
* options.addOption(new Option("o", "option", true, "Turn on option with argument."));
* }
*
* with "partial matching" turned on, {@code -de} only matches the
* {@code "debug"} option. However, with "partial matching" disabled,
* {@code -de} would enable both {@code debug} as well as
* {@code extract} options.
*
* @param allowPartialMatching if partial matching of long options shall be enabled
*/
public DefaultOptionParser(boolean allowPartialMatching) {
this.allowPartialMatching = allowPartialMatching;
}
public ParsedOptions parse(Options options, String[] args) throws OptionParserException {
return parse(options, args, null);
}
/**
* Parse the arguments according to the specified options and properties.
*
* @param options the specified Options
* @param args the command line arguments
* @param properties command line option name-value pairs
* @return the list of atomic option and value tokens
* @throws OptionParserException if there are any problems encountered
* while parsing the command line tokens
*/
public ParsedOptions parse(Options options, String[] args, Properties properties)
throws OptionParserException {
return parse(options, args, properties, false);
}
public ParsedOptions parse(Options options, String[] args, boolean skipParsingAtNonOption)
throws OptionParserException {
return parse(options, args, null, skipParsingAtNonOption);
}
/**
* Parse the arguments according to the specified options and properties.
*
* @param options the specified Options
* @param args the command line arguments
* @param properties command line option name-value pairs
* @param skipParsingAtNonOption if {@code true} an unrecognized argument stops
* the parsing and the remaining arguments are added to the
* {@link ParsedOptions}s args list. If {@code false} an unrecognized
* argument triggers a ParseException.
* @return the list of atomic option and value tokens
* @throws OptionParserException if there are any problems encountered
* while parsing the command line tokens
*/
public ParsedOptions parse(Options options, String[] args, Properties properties, boolean skipParsingAtNonOption)
throws OptionParserException {
this.options = options;
this.skipParsingAtNonOption = skipParsingAtNonOption;
this.currentOption = null;
this.expectedOpts = new ArrayList<>(options.getRequiredOptions());
// clear the data from the groups
for (OptionGroup group : options.getOptionGroups()) {
group.setSelected(null);
}
this.parsedOptions = new ParsedOptions();
if (args != null) {
for (String argument : args) {
handleToken(argument);
}
}
// check the arguments of the last option
checkRequiredOptionValues();
// add the default options
handleProperties(properties);
checkRequiredOptions();
return this.parsedOptions;
}
/**
* Sets the values of Options using the values in {@code properties}.
*
* @param properties the value properties to be processed
* @throws OptionParserException if option parsing fails
*/
private void handleProperties(Properties properties) throws OptionParserException {
if (properties == null) {
return;
}
for (Enumeration e = properties.propertyNames(); e.hasMoreElements();) {
String name = e.nextElement().toString();
Option opt = options.getOption(name);
if (opt == null) {
throw new UnrecognizedOptionException("Default option wasn't defined", name);
}
// if the option is part of a group, check if another option of the group has been selected
OptionGroup group = options.getOptionGroup(opt);
boolean selected = (group != null && group.getSelected() != null);
if (!parsedOptions.hasOption(name) && !selected) {
// get the value from the properties
String value = properties.getProperty(name);
if (opt.hasValue()) {
if (opt.getValues() == null || opt.getValues().length == 0) {
opt.addValue(value);
}
} else if (!("yes".equalsIgnoreCase(value)
|| "true".equalsIgnoreCase(value)
|| "1".equalsIgnoreCase(value))) {
// if the value is not yes, true or 1 then don't add the option to the ParsedOptions
continue;
}
handleOption(opt);
currentOption = null;
}
}
}
/**
* Handle any command line token.
*
* @param token the command line token to handle
* @throws OptionParserException if option parsing fails
*/
private void handleToken(String token) throws OptionParserException {
currentToken = token;
if (!"--".equals(token)) {
if (currentOption != null && currentOption.acceptsValue() &&
!currentOption.isWithEqualSign() && isArgument(token)) {
String t = OptionUtils.stripLeadingAndTrailingQuotes(token);
currentOption.addValue(t);
} else if (token.startsWith("--")) {
String t = OptionUtils.stripLeadingHyphens(token);
handleLongOption(t);
} else if (token.startsWith("-") && token.length() > 1) {
String t = OptionUtils.stripLeadingHyphens(token);
handleShortAndLongOption(t);
} else {
handleUnknownToken(token);
}
}
if (currentOption != null && !currentOption.acceptsValue()) {
currentOption = null;
}
}
/**
* Handles the following tokens:
*
* --L
* --L=V
* --L V
* --l
*
*
* @param token the command line token to handle
* @throws OptionParserException if option parsing fails
*/
private void handleLongOption(String token) throws OptionParserException {
if (token.indexOf('=') == -1) {
handleLongOptionWithoutEqual(token);
} else {
handleLongOptionWithEqual(token);
}
}
/**
* Handles the following tokens:
*
* --L
* -L
* --l
* -l
*
*
* @param token the command line token to handle
* @throws OptionParserException if option parsing fails
*/
private void handleLongOptionWithoutEqual(String token) throws OptionParserException {
List matchingOpts = getMatchingLongOptions(token);
if (matchingOpts.isEmpty()) {
handleUnknownToken(currentToken);
} else if (matchingOpts.size() > 1 && !options.hasLongOption(token)) {
throw new AmbiguousOptionException(token, matchingOpts);
} else {
String key = (options.hasLongOption(token) ? token : matchingOpts.get(0));
handleOption(options.getOption(key));
}
}
/**
* Handles the following tokens:
*
* --L=V
* -L=V
* --l=V
* -l=V
*
*
* @param token the command line token to handle
* @throws OptionParserException if option parsing fails
*/
private void handleLongOptionWithEqual(String token) throws OptionParserException {
int pos = token.indexOf('=');
String name = token.substring(0, pos);
String value = token.substring(pos + 1);
List matchingOpts = getMatchingLongOptions(name);
if (matchingOpts.isEmpty()) {
handleUnknownToken(currentToken);
} else if (matchingOpts.size() > 1 && !options.hasLongOption(name)) {
throw new AmbiguousOptionException(name, matchingOpts);
} else {
String key = (options.hasLongOption(name) ? name : matchingOpts.get(0));
Option option = options.getOption(key);
if (option.acceptsValue()) {
handleOption(option);
currentOption.addValue(value);
currentOption = null;
} else {
handleUnknownToken(currentToken);
}
}
}
/**
* Handles the following tokens:
*
* -S
* -SV
* -S V
* -S=V
* -S1S2
* -S1S2 V
* -SV1=V2
*
* -L
* -LV
* -L V
* -L=V
* -l
*
*
* @param token the command line token to handle
* @throws OptionParserException if option parsing fails
*/
private void handleShortAndLongOption(String token) throws OptionParserException {
if (token.length() == 1) {
// -S
if (options.hasShortOption(token)) {
handleOption(options.getOption(token));
} else {
handleUnknownToken(currentToken);
}
return;
}
int pos = token.indexOf('=');
if (pos == -1) {
// no equal sign found (-xxx)
if (options.hasShortOption(token)) {
handleOption(options.getOption(token));
} else if (!getMatchingLongOptions(token).isEmpty()) {
// -L or -l
handleLongOptionWithoutEqual(token);
} else {
// look for a long prefix (-Xmx512m)
String name = getLongPrefix(token);
if (name != null) {
Option option = options.getOption(name);
if (!option.isWithEqualSign() && option.acceptsValue()) {
handleOption(options.getOption(name));
currentOption.addValue(token.substring(name.length()));
currentOption = null;
return;
}
}
handleUnknownToken(currentToken);
}
} else {
// equal sign found (-xxx=yyy)
String name = token.substring(0, pos);
String value = token.substring(pos + 1);
// -S=V
Option option = options.getOption(name);
if (option != null && option.acceptsValue()) {
handleOption(option);
currentOption.addValue(value);
currentOption = null;
} else {
// -L=V or -l=V
handleLongOptionWithEqual(token);
}
}
}
/**
* Handles an unknown token. If the token starts with a dash an
* UnrecognizedOptionException is thrown. Otherwise the token is added
* to the arguments of the command line. If the skipParsingAtNonOption flag
* is set, this stops the parsing and the remaining tokens are added
* as-is in the arguments of the command line.
*
* @param token the command line token to handle
* @throws OptionParserException if option parsing fails
*/
private void handleUnknownToken(String token) throws OptionParserException {
if (token.startsWith("-") && token.length() > 1 && !skipParsingAtNonOption) {
throw new UnrecognizedOptionException("Unrecognized option: " + token, token);
}
parsedOptions.addArg(token);
}
private void handleOption(Option option) throws OptionParserException {
// check the previous option before handling the next one
checkRequiredOptionValues();
option = option.clone();
updateRequiredOptions(option);
parsedOptions.addOption(option);
if (option.hasValue()) {
currentOption = option;
} else {
currentOption = null;
}
}
/**
* Removes the option or its group from the list of expected elements.
*/
private void updateRequiredOptions(Option option) throws AlreadySelectedException {
if (option.isRequired()) {
expectedOpts.remove(option.getKey());
}
// if the option is in an OptionGroup make that option the selected option of the group
if (options.getOptionGroup(option) != null) {
OptionGroup group = options.getOptionGroup(option);
if (group.isRequired()) {
expectedOpts.remove(group);
}
group.setSelected(option);
}
}
/**
* Throws a {@link MissingOptionException} if all of the required options
* are not present.
*
* @throws MissingOptionException if any of the required Options are not present
*/
private void checkRequiredOptions() throws MissingOptionException {
// if there are required options that have not been processed
if (!expectedOpts.isEmpty()) {
throw new MissingOptionException(expectedOpts);
}
}
/**
* Throw a {@link MissingOptionValueException} if the current option
* didn't receive the number of values expected.
*/
private void checkRequiredOptionValues() throws OptionParserException {
if (currentOption != null && currentOption.requiresValue()) {
throw new MissingOptionValueException(currentOption);
}
}
/**
* Returns true is the token is a valid argument.
*
* @param token the command line token to handle
* @return true if the token is a valid argument
*/
private boolean isArgument(String token) {
return (!isOption(token) || isNegativeNumber(token));
}
/**
* Check if the token is a negative number.
*
* @param token the command line token to handle
* @return true if the token is a negative number
*/
private boolean isNegativeNumber(String token) {
try {
Double.parseDouble(token);
return true;
} catch (NumberFormatException e) {
return false;
}
}
/**
* Tells if the token looks like an option.
*
* @param token the command line token to handle
* @return true if the token looks like an option
*/
private boolean isOption(String token) {
return (isLongOption(token) || isShortOption(token));
}
/**
* Tells if the token looks like a short option.
*
* @param token the command line token to handle
* @return true if the token like a short option
*/
private boolean isShortOption(String token) {
// short options (-S, -SV, -S=V, -SV1=V2, -S1S2)
if (!token.startsWith("-") || token.length() == 1) {
return false;
}
// remove leading "-" and "=value"
int pos = token.indexOf("=");
String name = (pos == -1 ? token.substring(1) : token.substring(1, pos));
if (options.hasShortOption(name)) {
return true;
}
// check for several concatenated short options
return (name.length() > 0 && options.hasShortOption(String.valueOf(name.charAt(0))));
}
/**
* Tells if the token looks like a long option.
*
* @param token the command line token to handle
* @return true if the token like a long option
*/
private boolean isLongOption(String token) {
if (!token.startsWith("-") || token.length() == 1) {
return false;
}
int pos = token.indexOf("=");
String t = (pos == -1 ? token : token.substring(0, pos));
if (!getMatchingLongOptions(t).isEmpty()) {
// long or partial long options (--L, -L, --L=V, -L=V, --l, --l=V)
return true;
} else if (getLongPrefix(token) != null && !token.startsWith("--")) {
// -LV
return true;
}
return false;
}
/**
* Returns a list of matching option strings for the given token, depending
* on the selected partial matching policy.
*
* @param token the token (may contain leading dashes)
* @return the list of matching option strings or an empty list if no
* matching option could be found
*/
private List getMatchingLongOptions(String token) {
if (allowPartialMatching) {
return options.getMatchingOptions(token);
} else {
List matches = new ArrayList<>(1);
if (options.hasLongOption(token)) {
Option option = options.getOption(token);
matches.add(option.getLongName());
}
return matches;
}
}
/**
* Search for a prefix that is the long name of an option (-Xmx512m).
*
* @param token the command line token to handle
*/
private String getLongPrefix(String token) {
String name = null;
for (int i = token.length() - 2; i > 1; i--) {
String prefix = token.substring(0, i);
if (options.hasLongOption(prefix)) {
name = prefix;
break;
}
}
return name;
}
}
