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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.common.command;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.SetMultimap;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility for parsing command-flag like arguments from raw space split strings.
*/
public class Arguments {
private static final Pattern FLAG_REGEX = Pattern.compile("^--(.+)$");
private final List<String> rawArgs;
private final SetMultimap<String, String> parsedArgs;
private String parsedSubCommand = null;
public Arguments(List<String> rawArgs, boolean allowSubCommand) {
this.rawArgs = rawArgs;
this.parsedArgs = HashMultimap.create();
String flag = null;
List<String> value = null;
for (int i = 0; i < this.rawArgs.size(); i++) {
String arg = this.rawArgs.get(i);
Matcher matcher = FLAG_REGEX.matcher(arg);
boolean matches = matcher.matches();
if (i == 0 && allowSubCommand && !matches) {
this.parsedSubCommand = arg;
} else if (flag == null || matches) {
if (!matches) {
throw new ParseException("Expected flag at position " + i + " but got '" + arg + "' instead!");
}
// store existing value, if present
if (flag != null) {
this.parsedArgs.put(flag, String.join(" ", value));
}
flag = matcher.group(1).toLowerCase();
value = new ArrayList<>();
} else {
// part of a value
value.add(arg);
}
}
// store remaining value, if present
if (flag != null) {
this.parsedArgs.put(flag, String.join(" ", value));
}
}
public List<String> raw() {
return this.rawArgs;
}
public String subCommand() {
return this.parsedSubCommand;
}
public int intFlag(String key) {
Iterator<String> it = this.parsedArgs.get(key).iterator();
if (it.hasNext()) {
try {
return Math.abs(Integer.parseInt(it.next()));
} catch (NumberFormatException e) {
throw new ParseException("Invalid input for '" + key + "' argument. Please specify a number!");
}
}
return -1; // undefined
}
public double doubleFlag(String key) {
Iterator<String> it = this.parsedArgs.get(key).iterator();
if (it.hasNext()) {
try {
return Math.abs(Double.parseDouble(it.next()));
} catch (NumberFormatException e) {
throw new ParseException("Invalid input for '" + key + "' argument. Please specify a number!");
}
}
return -1; // undefined
}
public Set<String> stringFlag(String key) {
return this.parsedArgs.get(key);
}
public boolean boolFlag(String key) {
return this.parsedArgs.containsKey(key);
}
public static final class ParseException extends IllegalArgumentException {
public ParseException(String s) {
super(s);
}
}
}
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