Added Chat Calculator

README.md

@@ -34,9 +34,14 @@ As a challenge I'm trying to make it as user-friendly as possible. (It ain't the
 - /spectator | Essentially server-side free-cam, you get put in spectator and are able to fly around, once you use the command again you get put back to where you were.
 - /slimechunk (/sc) | See if you're currently in a slimechunk
 
+# Currently working on 1.3.2
+
+## Server Side
+- [x] Chat Calculator
+
 ## Client Side
 
-- Teleportation Angle Viewer  
+- [x] Teleportation Angle Viewer  
 ![Teleportation Keybindings](https://i.imgur.com/gjO1H3d.png)
 
 # Features to come

src/main/java/wtf/hak/survivalfabric/config/Config.java

@@ -38,6 +38,8 @@ public class Config {
     public boolean veinMinerEnabled = true;
     public int maxVeinSize = 99999;
 
+    public boolean chatCalcEnabled = true;
+
     public ScreenHandlerType<GenericContainerScreenHandler> screenHandlerType() {
         return switch (sharedEnderChestRows) {
             case 1 -> ScreenHandlerType.GENERIC_9X1;

src/main/java/wtf/hak/survivalfabric/mixin/PlayerManagerMixin.java

@@ -18,6 +18,8 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 import wtf.hak.survivalfabric.commands.SpectatorCommand;
 import wtf.hak.survivalfabric.config.ConfigManager;
 
+import java.awt.*;
+import java.beans.Expression;
 import java.util.Objects;
 import java.util.Set;
 
@@ -53,9 +55,74 @@ public abstract class PlayerManagerMixin {
     @Inject(method = {"broadcast(Lnet/minecraft/network/message/SignedMessage;Lnet/minecraft/server/network/ServerPlayerEntity;Lnet/minecraft/network/message/MessageType$Parameters;)V"}, at = {@At("HEAD")}, cancellable = true)
     private void onBroadcast(SignedMessage message, ServerPlayerEntity sender, MessageType.Parameters parameters, CallbackInfo ci) {
         if(sender != null && ConfigManager.getConfig().chatMessageEnabled) {
-            Text text = Text.literal(String.format(ConfigManager.getConfig().chatMessage, sender.getName().getString(), message.getContent().getString()));
-            Objects.requireNonNull(sender.getServer()).getPlayerManager().broadcast(text, false);
+            String rawMessage = message.getContent().getString().trim();
+            if(sender != null && ConfigManager.getConfig().chatCalcEnabled && rawMessage.endsWith("=")) {
+                String expression = rawMessage.substring(0, rawMessage.length() - 1).trim();
+                try {
+                    String result = String.valueOf(evaluateExpression(expression));
+                    if(rawMessage.contains(" ")) rawMessage += " ";
+                    rawMessage += (result.endsWith(".0")) ? result.substring(0, result.length() - 2) : result;
+                } catch (Exception e) {}
+            }
+            Text text = Text.literal(String.format(ConfigManager.getConfig().chatMessage, sender.getName().getString(), rawMessage));
+            sender.getServer().getPlayerManager().broadcast(text, false);
             ci.cancel();
+        } else if (sender != null && ConfigManager.getConfig().chatCalcEnabled) {
+            String rawMessage = message.getContent().getString().trim();
+            if (rawMessage.endsWith("=")) {
+                String expression = rawMessage.substring(0, rawMessage.length() - 1).trim();
+                try {
+                    String result = String.valueOf(evaluateExpression(expression));
+                    if(rawMessage.contains(" ")) rawMessage += " ";
+                    rawMessage += (result.endsWith(".0")) ? result.substring(0, result.length() - 2) : result;
+                    Text formattedMessage = Text.literal("<" + sender.getName().getString() + "> " + rawMessage);
+                    sender.getServer().getPlayerManager().broadcast(formattedMessage, false);
+                    ci.cancel();
+                } catch (Exception e) {}
+            }
         }
     }
+
+    private double evaluateExpression(String expression) {
+        return evaluate(expression.replaceAll("\\s", ""), new int[]{0});
+    }
+
+    private double evaluate(String expr, int[] index) {
+        double value = parseTerm(expr, index);
+        while (index[0] < expr.length()) {
+            char op = expr.charAt(index[0]);
+            if (op != '+' && op != '-') break;
+            index[0]++;
+            double nextTerm = parseTerm(expr, index);
+            value = (op == '+') ? value + nextTerm : value - nextTerm;
+        }
+        return value;
+    }
+
+    private double parseTerm(String expr, int[] index) {
+        double value = parseFactor(expr, index);
+        while (index[0] < expr.length()) {
+            char op = expr.charAt(index[0]);
+            if (op != '*' && op != '/') break;
+            index[0]++;
+            double nextFactor = parseFactor(expr, index);
+            value = (op == '*') ? value * nextFactor : value / nextFactor;
+        }
+        return value;
+    }
+
+    private double parseFactor(String expr, int[] index) {
+        if (expr.charAt(index[0]) == '(') {
+            index[0]++;
+            double value = evaluate(expr, index);
+            index[0]++; // Skip closing ')'
+            return value;
+        }
+
+        int start = index[0];
+        while (index[0] < expr.length() && (Character.isDigit(expr.charAt(index[0])) || expr.charAt(index[0]) == '.')) {
+            index[0]++;
+        }
+        return Double.parseDouble(expr.substring(start, index[0]));
+    }
 }