Added a calculator

11 files changed, 620 insertions, 2 deletions

diff --git a/src/main/java/io/github/moulberry/notenoughupdates/NotEnoughUpdates.java b/src/main/java/io/github/moulberry/notenoughupdates/NotEnoughUpdates.java
index bd54dfba..d372602e 100644
--- a/src/main/java/io/github/moulberry/notenoughupdates/NotEnoughUpdates.java
+++ b/src/main/java/io/github/moulberry/notenoughupdates/NotEnoughUpdates.java
@@ -57,6 +57,7 @@ import io.github.moulberry.notenoughupdates.miscfeatures.customblockzones.Custom
 import io.github.moulberry.notenoughupdates.miscfeatures.customblockzones.DwarvenMinesTextures;
 import io.github.moulberry.notenoughupdates.miscgui.CalendarOverlay;
 import io.github.moulberry.notenoughupdates.miscgui.InventoryStorageSelector;
+import io.github.moulberry.notenoughupdates.miscgui.SignCalculator;
 import io.github.moulberry.notenoughupdates.mixins.AccessorMinecraft;
 import io.github.moulberry.notenoughupdates.options.NEUConfig;
 import io.github.moulberry.notenoughupdates.overlays.FuelBar;
@@ -277,7 +278,7 @@ public class NotEnoughUpdates {
 		MinecraftForge.EVENT_BUS.register(new ItemTooltipListener(this));
 		MinecraftForge.EVENT_BUS.register(new RenderListener(this));
 		MinecraftForge.EVENT_BUS.register(new OldAnimationChecker());
-		MinecraftForge.EVENT_BUS.register(new CookieWarning());
+		MinecraftForge.EVENT_BUS.register(new SignCalculator());
 		MinecraftForge.EVENT_BUS.register(navigation);
 
 		if (Minecraft.getMinecraft().getResourceManager() instanceof IReloadableResourceManager) {
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/commands/Commands.java b/src/main/java/io/github/moulberry/notenoughupdates/commands/Commands.java
index 86411f4f..b152bc09 100644
--- a/src/main/java/io/github/moulberry/notenoughupdates/commands/Commands.java
+++ b/src/main/java/io/github/moulberry/notenoughupdates/commands/Commands.java
@@ -37,6 +37,7 @@ import io.github.moulberry.notenoughupdates.commands.help.LinksCommand;
 import io.github.moulberry.notenoughupdates.commands.help.SettingsCommand;
 import io.github.moulberry.notenoughupdates.commands.help.StorageViewerWhyCommand;
 import io.github.moulberry.notenoughupdates.commands.misc.AhCommand;
+import io.github.moulberry.notenoughupdates.commands.misc.CalculatorCommand;
 import io.github.moulberry.notenoughupdates.commands.misc.CalendarCommand;
 import io.github.moulberry.notenoughupdates.commands.misc.CosmeticsCommand;
 import io.github.moulberry.notenoughupdates.commands.misc.CustomizeCommand;
@@ -91,6 +92,7 @@ public class Commands {
 		ClientCommandHandler.instance.registerCommand(new ScreenCommand("neuoverlay", NEUOverlayPlacements::new));
 		//ClientCommandHandler.instance.registerCommand(new ScreenCommand("neututorial", NeuTutorial::new));
 		ClientCommandHandler.instance.registerCommand(new AhCommand());
+		ClientCommandHandler.instance.registerCommand(new CalculatorCommand());
 		ClientCommandHandler.instance.registerCommand(new CalendarCommand());
 
 		// Fairy Soul Commands
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/commands/help/HelpCommand.java b/src/main/java/io/github/moulberry/notenoughupdates/commands/help/HelpCommand.java
index ba49221e..a52fcd1d 100644
--- a/src/main/java/io/github/moulberry/notenoughupdates/commands/help/HelpCommand.java
+++ b/src/main/java/io/github/moulberry/notenoughupdates/commands/help/HelpCommand.java
@@ -52,6 +52,7 @@ public class HelpCommand extends ClientCommandBase {
 			"\u00a76/neuah \u00a7r\u00a77- Opens neu's custom ah GUI.",
 			"\u00a76/neumap \u00a7r\u00a77- Opens the dungeon map GUI.",
 			"\u00a76/neucalendar \u00a7r\u00a77- Opens neu's custom calendar GUI.",
+			"\u00a76/neucalc \u00a7r\u00a77- Run calculations.",
 			"",
 			"\u00a76\u00a7lOld commands:",
 			"\u00a76/peek \u00a7b?{user} \u00a72\u2D35 \u00a7r\u00a77- Shows quickly stats for a user.",
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/commands/misc/CalculatorCommand.java b/src/main/java/io/github/moulberry/notenoughupdates/commands/misc/CalculatorCommand.java
new file mode 100644
index 00000000..672183d7
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/commands/misc/CalculatorCommand.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2022 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates.commands.misc;
+
+import io.github.moulberry.notenoughupdates.commands.ClientCommandBase;
+import io.github.moulberry.notenoughupdates.util.Calculator;
+import net.minecraft.command.CommandException;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.util.ChatComponentText;
+import net.minecraft.util.EnumChatFormatting;
+
+import java.math.BigDecimal;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+
+public class CalculatorCommand extends ClientCommandBase {
+	public CalculatorCommand() {
+		super("neucalc");
+	}
+
+	@Override
+	public List<String> getCommandAliases() {
+		return Arrays.asList("neucalculator");
+	}
+
+	@Override
+	public void processCommand(ICommandSender sender, String[] args) throws CommandException {
+		if (args.length == 1 && Objects.equals(args[0], "help")) {
+			sender.addChatMessage(new ChatComponentText("§e[NEU] §fUse like §b/neucalc 1+2§f. You can also use postfixes like §b/neucalc 14k * 3§f. Turn on Sign Calculator in /neu misc to also support this in sign popups." ));
+			return;
+		}
+		String source = String.join(" ", args);
+		try {
+			BigDecimal calculate = Calculator.calculate(source);
+			sender.addChatMessage(new ChatComponentText(
+				EnumChatFormatting.YELLOW + "[NEU] " + EnumChatFormatting.WHITE + source + " = " + EnumChatFormatting.GREEN +
+					calculate.toPlainString()
+			));
+		} catch (Calculator.CalculatorException e) {
+			sender.addChatMessage(new ChatComponentText(
+				EnumChatFormatting.YELLOW + "[NEU] " + EnumChatFormatting.RED + "Error during calculation: " +
+					e.getMessage() + "\n" +
+					EnumChatFormatting.WHITE + source.substring(0, e.getOffset()) + EnumChatFormatting.DARK_RED +
+					source.substring(e.getOffset(), e.getLength() + e.getOffset()) + EnumChatFormatting.GRAY +
+					source.substring(e.getLength() + e.getOffset())
+			));
+		}
+	}
+}
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/events/SignSubmitEvent.java b/src/main/java/io/github/moulberry/notenoughupdates/events/SignSubmitEvent.java
new file mode 100644
index 00000000..9bc7b8b0
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/events/SignSubmitEvent.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2022 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates.events;
+
+import net.minecraft.client.gui.inventory.GuiEditSign;
+
+public class SignSubmitEvent extends NEUEvent {
+	public final GuiEditSign sign;
+	public final String[] lines;
+
+	public SignSubmitEvent(GuiEditSign sign, String[] hehe) {
+		this.sign = sign;
+		this.lines = hehe;
+	}
+
+	public GuiEditSign getSign() {
+		return sign;
+	}
+
+	public String[] getLines() {
+		return lines;
+	}
+}
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/miscgui/SignCalculator.java b/src/main/java/io/github/moulberry/notenoughupdates/miscgui/SignCalculator.java
new file mode 100644
index 00000000..115458c9
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/miscgui/SignCalculator.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2022 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates.miscgui;
+
+import io.github.moulberry.notenoughupdates.NotEnoughUpdates;
+import io.github.moulberry.notenoughupdates.events.SignSubmitEvent;
+import io.github.moulberry.notenoughupdates.mixins.AccessorGuiEditSign;
+import io.github.moulberry.notenoughupdates.util.Calculator;
+import io.github.moulberry.notenoughupdates.util.Utils;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.inventory.GuiEditSign;
+import net.minecraft.tileentity.TileEntitySign;
+import net.minecraft.util.EnumChatFormatting;
+import net.minecraftforge.client.event.GuiScreenEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+
+import java.math.BigDecimal;
+import java.util.Objects;
+
+public class SignCalculator {
+
+	String lastSource = null;
+	BigDecimal lastResult = null;
+	Calculator.CalculatorException lastException = null;
+
+	private boolean isEnabled() {
+		return NotEnoughUpdates.INSTANCE.config.misc.calculationMode != 0;
+	}
+
+	@SubscribeEvent
+	public void onSignDrawn(GuiScreenEvent.DrawScreenEvent.Post event) {
+		if (!(event.gui instanceof GuiEditSign))
+			return;
+		if (!isEnabled()) return;
+		GuiEditSign guiEditSign = (GuiEditSign) event.gui;
+		TileEntitySign tileSign = ((AccessorGuiEditSign) guiEditSign).getTileSign();
+		if (!tileSign.signText[1].getUnformattedText().equals("^^^^^^^^^^^^^^^")) return;
+		refresh(tileSign.signText[0].getUnformattedText());
+		Utils.drawStringCentered(
+			getRenderedString(),
+			Minecraft.getMinecraft().fontRendererObj,
+			guiEditSign.width / 2F,
+			guiEditSign.height / 4F - 120,
+			false,
+			0x808080FF
+		);
+	}
+
+	@SubscribeEvent
+	public void onSignSubmitted(SignSubmitEvent event) {
+		if (!isEnabled()) return;
+		if (Objects.equals(event.lines[1], "^^^^^^^^^^^^^^^")) {
+			refresh(event.lines[0]);
+			if (lastResult != null) {
+				event.lines[0] = lastResult.toPlainString();
+			}
+		}
+	}
+
+	public String getRenderedString() {
+		if (lastResult != null) {
+			String lr = lastResult.toPlainString();
+			if (Minecraft.getMinecraft().fontRendererObj.getStringWidth(lr) > 90) {
+				return EnumChatFormatting.WHITE + lastSource + " = " + EnumChatFormatting.RED + "Result too long";
+			}
+			return EnumChatFormatting.WHITE + lastSource + " = " + EnumChatFormatting.GREEN + lr;
+		} else if (lastException != null) {
+			return EnumChatFormatting.RED + lastException.getMessage();
+		}
+		return EnumChatFormatting.RED + "No calculation has been done.";
+	}
+
+	private void refresh(String source) {
+		if (Objects.equals(source, lastSource)) return;
+		lastSource = source;
+		int calculationMode = NotEnoughUpdates.INSTANCE.config.misc.calculationMode;
+		if (source.isEmpty() || calculationMode == 0 || (calculationMode == 1 && !source.startsWith("!"))) {
+			lastResult = null;
+			lastException = null;
+			return;
+		}
+		try {
+			lastResult = Calculator.calculate(calculationMode == 1 ? source.substring(1) : source);
+			lastException = null;
+		} catch (Calculator.CalculatorException ex) {
+			lastException = ex;
+			lastResult = null;
+		}
+	}
+}
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/mixins/MixinGuiEditSign.java b/src/main/java/io/github/moulberry/notenoughupdates/mixins/MixinGuiEditSign.java
new file mode 100644
index 00000000..bfdf05ab
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/mixins/MixinGuiEditSign.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2022 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates.mixins;
+
+import io.github.moulberry.notenoughupdates.events.SignSubmitEvent;
+import net.minecraft.client.gui.inventory.GuiEditSign;
+import net.minecraft.tileentity.TileEntitySign;
+import net.minecraft.util.ChatComponentText;
+import net.minecraft.util.IChatComponent;
+import org.objectweb.asm.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(GuiEditSign.class)
+public class MixinGuiEditSign {
+
+	@Redirect(method = "onGuiClosed", at = @At(value = "FIELD", opcode = Opcodes.GETFIELD, target = "Lnet/minecraft/tileentity/TileEntitySign;signText:[Lnet/minecraft/util/IChatComponent;"))
+	public IChatComponent[] onOnGuiClosed(TileEntitySign instance) {
+		String[] x = new String[4];
+		for (int i = 0; i < 4; i++) {
+			x[i] = instance.signText[i].getUnformattedText();
+		}
+		SignSubmitEvent signSubmitEvent = new SignSubmitEvent((GuiEditSign) (Object) this, x);
+		signSubmitEvent.post();
+		IChatComponent[] arr = new IChatComponent[4];
+		for (int i = 0; i < 4; i++) {
+			arr[i] = new ChatComponentText(signSubmitEvent.lines[i]);
+		}
+		return arr;
+	}
+
+}
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/options/seperateSections/Misc.java b/src/main/java/io/github/moulberry/notenoughupdates/options/seperateSections/Misc.java
index c0f4e8c9..ed559418 100644
--- a/src/main/java/io/github/moulberry/notenoughupdates/options/seperateSections/Misc.java
+++ b/src/main/java/io/github/moulberry/notenoughupdates/options/seperateSections/Misc.java
@@ -215,4 +215,12 @@ public class Misc {
 	@ConfigEditorBoolean
 	public boolean warpTwice = true;
 
+	@Expose
+	@ConfigOption(
+		name = "Sign Calculator",
+		desc = "§fReplace calculations like §9\"1+2\"§f with the calculation result in sign popups (AH/BZ)"
+	)
+	@ConfigEditorDropdown(values = {"Off", "Enabled with ! Prefix", "Always enabled"})
+	public int calculationMode = 0;
+
 }
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/util/Calculator.java b/src/main/java/io/github/moulberry/notenoughupdates/util/Calculator.java
new file mode 100644
index 00000000..eb1ba425
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/util/Calculator.java
@@ -0,0 +1,296 @@
+/*
+ * Copyright (C) 2022 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates.util;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Deque;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+public class Calculator {
+	public static BigDecimal calculate(String source) throws CalculatorException {
+		return evaluate(shuntingYard(lex(source)));
+	}
+
+	///<editor-fold desc="Lexing Time">
+	public enum TokenType {
+		NUMBER, BINOP, LPAREN, RPAREN, POSTOP
+	}
+
+	public static class Token {
+		public TokenType type;
+		String operatorValue;
+		long numericValue;
+		int exponent;
+		int tokenStart;
+		int tokenLength;
+	}
+
+	static String binops = "+-*/";
+	static String postops = "mkbts";
+	static String digits = "0123456789";
+
+	static void readDigitsInto(Token token, String source, boolean decimals) {
+		int startIndex = token.tokenStart + token.tokenLength;
+		for (int j = 0; j + startIndex < source.length(); j++) {
+			char d = source.charAt(j + startIndex);
+			int d0 = digits.indexOf(d);
+			if (d0 != -1) {
+				if (decimals)
+					token.exponent--;
+				token.numericValue *= 10;
+				token.numericValue += d0;
+				token.tokenLength += 1;
+			} else {
+				return;
+			}
+		}
+	}
+
+	public static class CalculatorException extends Exception {
+		int offset, length;
+
+		public CalculatorException(String message, int offset, int length) {
+			super(message);
+			this.offset = offset;
+			this.length = length;
+		}
+
+		public int getLength() {
+			return length;
+		}
+
+		public int getOffset() {
+			return offset;
+		}
+	}
+
+	public static List<Token> lex(String source) throws CalculatorException {
+		List<Token> tokens = new ArrayList<>();
+		for (int i = 0; i < source.length(); ) {
+			char c = source.charAt(i);
+			if (Character.isWhitespace(c)) {
+				i++;
+				continue;
+			}
+			Token token = new Token();
+			token.tokenStart = i;
+			if (binops.indexOf(c) != -1) {
+				token.tokenLength = 1;
+				token.type = TokenType.BINOP;
+				token.operatorValue = c + "";
+			} else if (postops.indexOf(c) != -1) {
+				token.tokenLength = 1;
+				token.type = TokenType.POSTOP;
+				token.operatorValue = c + "";
+			} else if (c == ')') {
+				token.tokenLength = 1;
+				token.type = TokenType.RPAREN;
+				token.operatorValue = ")";
+			} else if (c == '(') {
+				token.tokenLength = 1;
+				token.type = TokenType.LPAREN;
+				token.operatorValue = "(";
+			} else if ('.' == c) {
+				token.tokenLength = 1;
+				token.type = TokenType.NUMBER;
+				readDigitsInto(token, source, true);
+				if (token.tokenLength == 1) {
+					throw new CalculatorException("Invalid number literal", i, 1);
+				}
+			} else if (digits.indexOf(c) != -1) {
+				token.type = TokenType.NUMBER;
+				readDigitsInto(token, source, false);
+				if (i + token.tokenLength < source.length()) {
+					char p = source.charAt(i + token.tokenLength);
+					if ('.' == p) {
+						token.tokenLength++;
+						readDigitsInto(token, source, true);
+					}
+				}
+			} else {
+				throw new CalculatorException("Unknown thing " + c, i, 1);
+			}
+			tokens.add(token);
+			i += token.tokenLength;
+		}
+		return tokens;
+	}
+	///</editor-fold>
+
+	///<editor-fold desc="Shunting Time">
+	static int getPrecedence(Token token) throws CalculatorException {
+		switch (token.operatorValue.intern()) {
+			case "+":
+			case "-":
+				return 0;
+			case "*":
+			case "/":
+				return 1;
+		}
+		throw new CalculatorException("Unknown operator " + token.operatorValue, token.tokenStart, token.tokenLength);
+	}
+
+	public static List<Token> shuntingYard(List<Token> toShunt) throws CalculatorException {
+		// IT'S SHUNTING TIME
+		// This is an implementation of the shunting yard algorithm
+		// Dear god, just thinking about dijkstra makes me wet and hard, such a fucking good mathematician
+
+		Deque<Token> op = new ArrayDeque<>();
+		List<Token> out = new ArrayList<>();
+
+		for (Token currentlyShunting : toShunt) {
+			switch (currentlyShunting.type) {
+				case NUMBER:
+					out.add(currentlyShunting);
+					break;
+				case BINOP:
+					int p = getPrecedence(currentlyShunting);
+					while (!op.isEmpty()) {
+						Token l = op.peek();
+						if (l.type == TokenType.LPAREN)
+							break;
+						assert (l.type == TokenType.BINOP);
+						int pl = getPrecedence(l);
+						if (pl > p) {
+							out.add(op.pop());
+						} else {
+							break;
+						}
+					}
+					op.push(currentlyShunting);
+					break;
+				case LPAREN:
+					op.push(currentlyShunting);
+					break;
+				case RPAREN:
+					while (1 > 0) {
+						if (op.isEmpty())
+							throw new CalculatorException(
+								"Unbalanced right parenthesis",
+								currentlyShunting.tokenStart,
+								currentlyShunting.tokenLength
+							);
+						Token l = op.pop();
+						if (l.type == TokenType.LPAREN) {
+							break;
+						}
+						out.add(l);
+					}
+					break;
+				case POSTOP:
+					out.add(currentlyShunting);
+					break;
+			}
+		}
+		while (!op.isEmpty()) {
+			Token l = op.pop();
+			if (l.type == TokenType.LPAREN)
+				throw new CalculatorException("Unbalanced left parenthesis", l.tokenStart, l.tokenLength);
+			out.add(l);
+		}
+		return out;
+	}
+
+	/// </editor-fold>
+
+	///<editor-fold desc="Evaluating Time">
+
+	public static BigDecimal evaluate(List<Token> rpnTokens) throws CalculatorException {
+		Deque<BigDecimal> values = new ArrayDeque<>();
+		try {
+			for (Token command : rpnTokens) {
+				switch (command.type) {
+					case NUMBER:
+						values.push(new BigDecimal(command.numericValue).scaleByPowerOfTen(command.exponent));
+						break;
+					case BINOP:
+						BigDecimal right = values.pop().setScale(2, RoundingMode.HALF_UP);
+						BigDecimal left = values.pop().setScale(2, RoundingMode.HALF_UP);
+						switch (command.operatorValue.intern()) {
+							case "*":
+								values.push(left.multiply(right).setScale(2, RoundingMode.HALF_UP));
+								break;
+							case "/":
+								try {
+									values.push(left.divide(right, RoundingMode.HALF_UP).setScale(2, RoundingMode.HALF_UP));
+								} catch (ArithmeticException e) {
+									throw new CalculatorException("Encountered division by 0", command.tokenStart, command.tokenLength);
+								}
+								break;
+							case "+":
+								values.push(left.add(right).setScale(2, RoundingMode.HALF_UP));
+								break;
+							case "-":
+								values.push(left.min(right).setScale(2, RoundingMode.HALF_UP));
+								break;
+							default:
+								throw new CalculatorException(
+									"Unknown operation " + command.operatorValue,
+									command.tokenStart,
+									command.tokenLength
+								);
+						}
+						break;
+					case LPAREN:
+					case RPAREN:
+						throw new CalculatorException(
+							"Did not expect unshunted token in RPN",
+							command.tokenStart,
+							command.tokenLength
+						);
+					case POSTOP:
+						BigDecimal p = values.pop();
+						switch (command.operatorValue.intern()) {
+							case "s":
+								values.push(p.multiply(new BigDecimal(64)).setScale(2, RoundingMode.HALF_UP));
+								break;
+							case "k":
+								values.push(p.multiply(new BigDecimal(1_000)).setScale(2, RoundingMode.HALF_UP));
+								break;
+							case "m":
+								values.push(p.multiply(new BigDecimal(1_000_000)).setScale(2, RoundingMode.HALF_UP));
+								break;
+							case "t":
+								values.push(p.multiply(new BigDecimal(1_000_000_000)).setScale(2, RoundingMode.HALF_UP));
+								break;
+							default:
+								throw new CalculatorException(
+									"Unknown operation " + command.operatorValue,
+									command.tokenStart,
+									command.tokenLength
+								);
+						}
+						break;
+				}
+			}
+			BigDecimal peek = values.pop();
+			return peek.stripTrailingZeros();
+		} catch (NoSuchElementException e) {
+			throw new CalculatorException("Unfinished expression", 0, 0);
+		}
+	}
+
+	///</editor-fold>
+
+}
diff --git a/src/main/resources/mixins.notenoughupdates.json b/src/main/resources/mixins.notenoughupdates.json
index 63b8211b..8b1d4559 100644
--- a/src/main/resources/mixins.notenoughupdates.json
+++ b/src/main/resources/mixins.notenoughupdates.json
@@ -46,5 +46,10 @@
     "MixinWorld",
     "MixinWorldClient"
   ],
-  "client": ["AccessorGuiContainer", "AccessorGuiEditSign", "AccessorMinecraft"]
+  "client": [
+    "AccessorGuiContainer",
+    "AccessorGuiEditSign",
+    "AccessorMinecraft",
+    "MixinGuiEditSign"
+  ]
 }
diff --git a/src/test/java/io/github/moulberry/notenoughupdates/util/CalculatorTest.java b/src/test/java/io/github/moulberry/notenoughupdates/util/CalculatorTest.java
new file mode 100644
index 00000000..66ba5442
--- /dev/null
+++ b/src/test/java/io/github/moulberry/notenoughupdates/util/CalculatorTest.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2022 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates.util;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+public class CalculatorTest {
+	public static void main(String[] args) throws Calculator.CalculatorException {
+		List<Calculator.Token> lex = Calculator.lex("10k + 3 * 4m");
+		List<Calculator.Token> shunted = Calculator.shuntingYard(lex);
+		for (Calculator.Token rawToken : shunted) {
+			System.out.printf(
+				"%s(%s)",
+				rawToken.type,
+				rawToken.operatorValue == null ? rawToken.numericValue + " * 10 ^ " + rawToken.exponent : rawToken.operatorValue
+			);
+		}
+		System.out.println();
+		BigDecimal evaluate = Calculator.evaluate(shunted);
+		System.out.println("Eval: " + evaluate);
+	}
+
+}