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package re.jag.parquet.commands;
import static net.minecraft.server.command.CommandManager.argument;
import static net.minecraft.server.command.CommandManager.literal;
import com.mojang.brigadier.CommandDispatcher;
import com.mojang.brigadier.builder.LiteralArgumentBuilder;
import net.minecraft.command.argument.MessageArgumentType;
import net.minecraft.entity.Entity;
import net.minecraft.server.command.ServerCommandSource;
import net.minecraft.text.LiteralText;
import net.minecraft.text.Text;
import java.util.ArrayList;
public class Calculator {
public static void register(CommandDispatcher<ServerCommandSource> dispatcher) {
LiteralArgumentBuilder<ServerCommandSource> r = literal("r").executes( (c) -> help(c.getSource()) ).then(
argument("expression", MessageArgumentType.message()).executes((c) -> calc(c.getSource(), MessageArgumentType.getMessage(c, "expression")))
);
dispatcher.register(r);
}
private static int calc(ServerCommandSource _source, Text _expression) {
String expression = _expression.asString();
expression = expression.replace(" ", "");
char expression_array[] = expression.toCharArray();
ArrayList<String> parts = new ArrayList<String>();
ArrayList<String> operators = new ArrayList<String>();
int last_break=-1;
String element="";
for(int i = 0; i < expression_array.length; i++) {
int op_weight = get_operator_weight(expression_array[i]);
if (Math.abs(last_break - i) > 1 && op_weight > 0) {
parts.add(element);
operators.add(String.copyValueOf(expression_array, i, 1));
element = "";
last_break = i;
} else {
element+=expression_array[i];
}
}
if(element.length() > 0)
parts.add(element);
int current_level = 2;
while(current_level > 0) {
int level_count = 0;
for (int o = 0; o < operators.size(); o++) {
String operator = operators.get(o);
if (get_operator_weight(operator) == current_level) {
level_count++;
String result = execute_operation(operator, parts.get(o), parts.get(o+1), _source);
parts.set(o, result);
parts.remove(o+1);
operators.remove(o);
break;
}
}
if (level_count == 0)
current_level--;
}
_source.sendFeedback(new LiteralText(parts.get(0)), false);
return 0;
}
private static Integer parse_operand(String _operand, ServerCommandSource _source) {
Integer operand = null;
try {
operand = Integer.parseInt(_operand);
} catch (NumberFormatException e) {
Entity player = _source.getEntity();
switch (_operand) {
case "x":
if (player != null)
operand = (int)player.getPos().x;
break;
case "y":
if (player != null)
operand = (int)player.getPos().y;
break;
case "z":
if (player != null)
operand = (int)player.getPos().z;
break;
default:
}
}
if (operand == null) {
String msg = "Parsing failed for Operand \"" + _operand + "\"";
_source.sendError(new LiteralText(msg));
}
return operand;
}
private static int get_operator_weight(char _c) {
switch(_c) {
case '+':
case '-':
return 1;
case '*':
case '/':
return 2;
}
return 0;
}
private static int get_operator_weight(String _s) {
if (_s.length() != 1)
return 0;
return get_operator_weight(_s.toCharArray()[0]);
}
private static String execute_operation(String _operator, String _left, String _right, ServerCommandSource _source) {
String result = null;
Integer left = parse_operand(_left, _source);
Integer right = parse_operand(_right, _source);
if (left == null || right == null)
return null;
switch (_operator) {
case "+":
result = String.valueOf(left + right);
break;
case "-":
result = String.valueOf(left - right);
break;
case "*":
result = String.valueOf(left * right);
break;
case "/":
result = String.valueOf(left / right);
break;
}
return result;
}
private static int help(ServerCommandSource _source){
_source.sendFeedback(new LiteralText("RTFM"), false);
return 0;
}
}
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