diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/Command.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/Command.java
new file mode 100644
index 0000000..5930bc9
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/Command.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.List;
+
+public class Command {
+    public final boolean repeatable;
+    public final List<List<TokenType>> arguments;
+
+    public Command(boolean repeatable, List<List<TokenType>> arguments) {
+        this.repeatable = repeatable;
+        this.arguments = arguments;
+    }
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/Commands.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/Commands.java
new file mode 100644
index 0000000..3c2debc
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/Commands.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Commands {
+
+    private Commands() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static Map<String, Command> COMMANDS = new HashMap<>();
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/ExpressionColorizer.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/ExpressionColorizer.java
new file mode 100644
index 0000000..feaea4a
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/ExpressionColorizer.java
@@ -0,0 +1,134 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class ExpressionColorizer {
+
+    private ExpressionColorizer() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static List<Token> colorize(String expression) {
+        List<String> parts = tokenize(expression);
+        List<Token> tokens = new ArrayList<>();
+        for (int i = 0; i < parts.size(); i++) {
+            String part = parts.get(i);
+            if ("{".equals(part) || "}".equals(part)) {
+                tokens.add(new Token(part, TokenTypeColors.OTHER));
+                continue;
+            }
+            if ("true".equalsIgnoreCase(part) || "false".equalsIgnoreCase(part)) {
+                tokens.add(new Token(part, TokenTypeColors.BOOLEAN));
+                continue;
+            }
+            try {
+                Double.parseDouble(part);
+                tokens.add(new Token(part, TokenTypeColors.NUMBER));
+                continue;
+            } catch (NumberFormatException ignored) {
+            }
+            try {
+                Long.parseLong(part);
+                tokens.add(new Token(part, TokenTypeColors.NUMBER));
+                continue;
+            } catch (NumberFormatException ignored) {
+            }
+            if (part.contains(".")) {
+                String[] split = part.split("\\.");
+                if (split.length == 1) {
+                    tokens.add(new Token(part, TokenTypeColors.VARIABLE));
+                    continue;
+                }
+                if (VariablePrefixes.RPEFIXES.contains(split[0])) {
+                    tokens.add(new Token(split[0], TokenTypeColors.OTHER));
+                    tokens.add(new Token(".", TokenTypeColors.OTHER));
+                    split = Arrays.copyOfRange(split, 1, split.length);
+                }
+                tokens.add(new Token(split[0], TokenTypeColors.VARIABLE));
+                for (int j = 1; j < split.length; j++) {
+                    String s = split[j];
+                    tokens.add(new Token(".", TokenTypeColors.OTHER));
+                    if (VariableSuffixes.SUFFIXES.contains(s)) {
+                        tokens.add(new Token(s, TokenTypeColors.OTHER));
+                    } else {
+                        tokens.add(new Token(s, TokenTypeColors.ERROR));
+                    }
+                }
+                continue;
+            }
+            if (Operators.OPERATORS.contains(part)) {
+                String previous = get(parts, i, -1);
+                String next = get(parts, i, 1);
+                if (previous == null || next == null) {
+                    tokens.add(new Token(part, TokenTypeColors.ERROR));
+                    continue;
+                }
+                if (Operators.OPERATORS.contains(previous) || Operators.OPERATORS.contains(next)) {
+                    tokens.add(new Token(part, TokenTypeColors.ERROR));
+                    continue;
+                }
+                if ("{".equals(previous) || "}".equals(next)) {
+                    tokens.add(new Token(part, TokenTypeColors.ERROR));
+                    continue;
+                }
+                tokens.add(new Token(part, TokenTypeColors.OTHER));
+                continue;
+            }
+            if (part.matches("[+\\-*/%^&|<>=!]+")) {
+                tokens.add(new Token(part, TokenTypeColors.ERROR));
+                continue;
+            }
+            tokens.add(new Token(part, TokenTypeColors.VARIABLE));
+        }
+        return tokens;
+    }
+
+    private static String get(List<String> parts, int index, int direction) {
+        for (int i = index + direction; i >= 0 && i < parts.size(); i += direction) {
+            String part = parts.get(i);
+            if (!part.isBlank()) return part;
+        }
+        return null;
+    }
+
+    private static List<String> tokenize(String s) {
+        List<String> tokens = new ArrayList<>();
+        StringBuilder token = new StringBuilder();
+        for (int i = 0; i < s.length(); i++) {
+            char c = s.charAt(i);
+            if (c == '{' || c == '}' || c == ' ') {
+                if (token.length() > 0) {
+                    tokens.add(token.toString());
+                    token = new StringBuilder();
+                }
+                tokens.add(c + "");
+                continue;
+            }
+            StringBuilder op = new StringBuilder();
+            for (int j = i; j < s.length(); j++) {
+                char k = s.charAt(j);
+                if (k == '+' || k == '-' || k == '*' || k == '/' || k == '%' || k == '^' || k == '&' || k == '|' || k == '>' || k == '<' || k == '=' || k == '!') {
+                    op.append(k);
+                } else {
+                    break;
+                }
+            }
+            if (op.length() > 0) {
+                if (token.length() > 0) {
+                    tokens.add(token.toString());
+                    token = new StringBuilder();
+                }
+                tokens.add(op.toString());
+                i += op.length() - 1;
+                continue;
+            }
+            token.append(c);
+        }
+        if (token.length() > 0) {
+            tokens.add(token.toString());
+        }
+        return tokens;
+    }
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/Headers.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/Headers.java
new file mode 100644
index 0000000..2e3c4e7
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/Headers.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class Headers {
+
+    private Headers() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static final Set<String> HEADERS = new HashSet<>();
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/Operators.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/Operators.java
new file mode 100644
index 0000000..70586f4
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/Operators.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class Operators {
+
+    private Operators() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static final Set<String> OPERATORS = new HashSet<>();
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/ScriptColorizer.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/ScriptColorizer.java
new file mode 100644
index 0000000..6086486
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/ScriptColorizer.java
@@ -0,0 +1,278 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ScriptColorizer {
+
+    private ScriptColorizer() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static List<Token> colorize(int lineNumber, String line) {
+        if (lineNumber == 0) {
+            List<Token> tokens = colorizeHeader(line);
+            if (tokens != null) return tokens;
+        }
+
+        List<Token> tokens;
+        tokens = colorizeComment(line);
+        if (tokens != null) return tokens;
+        tokens = colorizeJumpPoint(line);
+        if (tokens != null) return tokens;
+        return colorizeLine(line);
+    }
+
+    private static List<Token> colorizeHeader(String line) {
+        if (!line.startsWith("#!")) return null;
+        List<Token> tokens = new ArrayList<>();
+        tokens.add(new Token("#!", TokenTypeColors.COMMENT));
+        String s = line.substring(2);
+
+        for (String pattern : Headers.HEADERS) {
+            if (s.matches(pattern)) {
+                tokens.add(new Token(s, TokenTypeColors.OTHER));
+                return tokens;
+            }
+        }
+        tokens.add(new Token(s, TokenTypeColors.ERROR));
+        return tokens;
+    }
+
+    private static List<Token> colorizeComment(String line) {
+        if (!line.startsWith("#")) return null;
+        return List.of(new Token(line, TokenTypeColors.COMMENT));
+    }
+
+    private static List<Token> colorizeJumpPoint(String line) {
+        if (!line.startsWith(".")) return null;
+        return List.of(new Token(line, TokenTypeColors.JUMP_POINT));
+    }
+
+    private static List<Token> colorizeLine(String line) {
+        List<Token> tokens = new ArrayList<>();
+
+        String command = line;
+        if (line.indexOf(' ') != -1) {
+            command = line.substring(0, line.indexOf(' '));
+        }
+        boolean repeatable = false;
+        List<List<TokenType>> argumentTypes = null;
+        if (Commands.COMMANDS.containsKey(command)) {
+            Command c = Commands.COMMANDS.get(command);
+            repeatable = c.repeatable;
+            argumentTypes = c.arguments;
+            tokens.add(new Token(command, TokenTypeColors.LITERAL));
+        } else {
+            repeatable = true;
+            argumentTypes = new ArrayList<>();
+            argumentTypes.add(List.of(TokenType.any));
+            tokens.add(new Token(command, TokenTypeColors.OTHER));
+        }
+        if (command.equals(line)) return tokens;
+        tokens.add(Token.SPACE);
+
+        String args = line.substring(command.length() + 1);
+        tokens.addAll(colorizeArgs(args, repeatable, argumentTypes));
+        return tokens;
+    }
+
+    private static List<Token> colorizeArgs(String args, boolean repeatable, List<List<TokenType>> argumentTypes) {
+        List<Token> tokens = new ArrayList<>();
+
+        for (List<TokenType> tokenTypes : argumentTypes) {
+            List<Token> temp = new ArrayList<>();
+            int index = 0;
+            int argIndex = 0;
+            try {
+                while (argIndex < args.length()) {
+                    if (args.charAt(argIndex) == ' ') {
+                        argIndex++;
+                        temp.add(Token.SPACE);
+                        continue;
+                    }
+                    List<Token> current = parse(tokenTypes.get(index), args.substring(argIndex));
+                    if (current.isEmpty()) {
+                        break;
+                    }
+                    temp.addAll(current);
+                    argIndex += current.stream().mapToInt(t -> t.text.length()).sum();
+                    index++;
+                    if (repeatable && index == tokenTypes.size()) {
+                        index--;
+                    }
+                    if (index == tokenTypes.size()) {
+                        break;
+                    }
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+            if (argIndex != args.length()) {
+                continue;
+            }
+            if (index != tokenTypes.size() - (repeatable ? 1 : 0)) {
+                continue;
+            }
+
+            if (!temp.isEmpty()) {
+                tokens.addAll(temp);
+                break;
+            }
+        }
+
+        if (tokens.isEmpty()) {
+            tokens.add(new Token(args, TokenTypeColors.OTHER));
+        }
+        return tokens;
+    }
+
+    private static List<Token> parse(TokenType type, String current) {
+        return switch (type) {
+            case any -> parseAny(current);
+            case expression -> parseExpression(current);
+            case jump_point -> parseJumpPoint(current);
+            case variable -> parseVariable(current);
+            case text_type -> parseText(current);
+            case number_type -> parseNumber(current);
+            case floating_number_type -> parseFloatingNumber(current);
+            case boolean_type -> parseBoolean(current);
+        };
+    }
+
+    private static List<Token> parseAny(String current) {
+        List<Token> tokens = parseExpression(current);
+        if (!tokens.isEmpty()) return tokens;
+        tokens = parseFloatingNumber(current);
+        if (!tokens.isEmpty()) return tokens;
+        tokens = parseNumber(current);
+        if (!tokens.isEmpty()) return tokens;
+        tokens = parseBoolean(current);
+        if (!tokens.isEmpty()) return tokens;
+        return parseText(current);
+    }
+
+    private static List<Token> parseExpression(String current) {
+        if (!current.startsWith("{")) return new ArrayList<>();
+        int depth = 0;
+        int index = 0;
+        do {
+            if (current.charAt(index) == '{') {
+                depth++;
+            } else if (current.charAt(index) == '}') {
+                depth--;
+            }
+            index++;
+        } while (depth != 0 && index < current.length());
+        if (depth != 0) return List.of(new Token(current, TokenTypeColors.ERROR));
+        return ExpressionColorizer.colorize(current.substring(0, index));
+    }
+
+    private static List<Token> parseJumpPoint(String current) {
+        int index = current.indexOf(' ');
+        if (index == -1) {
+            return List.of(new Token(current, TokenTypeColors.JUMP_POINT));
+        } else {
+            return List.of(new Token(current.substring(0, index), TokenTypeColors.JUMP_POINT));
+        }
+    }
+
+    private static List<Token> parseVariable(String current) {
+        int index = current.indexOf(' ');
+        if (index == -1) {
+            return List.of(new Token(current, TokenTypeColors.VARIABLE));
+        } else {
+            return List.of(new Token(current.substring(0, index), TokenTypeColors.VARIABLE));
+        }
+    }
+
+    private static List<Token> parseText(String current) {
+        int index = current.indexOf(' ');
+        if (index != -1) {
+            current = current.substring(0, index);
+        }
+        List<Token> tokens = new ArrayList<>();
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < current.length(); i++) {
+            char c = current.charAt(i);
+            if (c == '&' && i + 1 < current.length()) {
+                char color = current.charAt(i + 1);
+                if (color >= '0' && color <= '9' || color >= 'a' && color <= 'f' || color >= 'A' && color <= 'F') {
+                    if (sb.length() > 0) {
+                        tokens.add(new Token(sb.toString(), TokenTypeColors.TEXT));
+                        sb = new StringBuilder();
+                    }
+                    i++;
+                    switch (color) {
+                        case '0' -> tokens.add(new Token("&0", 0xFF000000));
+                        case '1' -> tokens.add(new Token("&1", 0xFF0000AA));
+                        case '2' -> tokens.add(new Token("&2", 0xFF00AA00));
+                        case '3' -> tokens.add(new Token("&3", 0xFF00AAAA));
+                        case '4' -> tokens.add(new Token("&4", 0xFFAA0000));
+                        case '5' -> tokens.add(new Token("&5", 0xFFAA00AA));
+                        case '6' -> tokens.add(new Token("&6", 0xFFFFAA00));
+                        case '7' -> tokens.add(new Token("&7", 0xFFAAAAAA));
+                        case '8' -> tokens.add(new Token("&8", 0xFF555555));
+                        case '9' -> tokens.add(new Token("&9", 0xFF5555FF));
+                        case 'a', 'A' -> tokens.add(new Token("&a", 0xFF55FF55));
+                        case 'b', 'B' -> tokens.add(new Token("&b", 0xFF55FFFF));
+                        case 'c', 'C' -> tokens.add(new Token("&c", 0xFFFF5555));
+                        case 'd', 'D' -> tokens.add(new Token("&d", 0xFFFF55FF));
+                        case 'e', 'E' -> tokens.add(new Token("&e", 0xFFFFFF55));
+                        case 'f', 'F' -> tokens.add(new Token("&f", 0xFFFFFFFF));
+                        default -> tokens.add(new Token("&" + color, TokenTypeColors.TEXT));
+                    }
+                } else {
+                    sb.append(c);
+                }
+            } else {
+                sb.append(c);
+            }
+        }
+        if (sb.length() > 0) {
+            tokens.add(new Token(sb.toString(), TokenTypeColors.TEXT));
+        }
+        return tokens;
+    }
+
+    private static List<Token> parseNumber(String current) {
+        int index = current.indexOf(' ');
+        String number = current;
+        if (index != -1) {
+            number = current.substring(0, index);
+        }
+        try {
+            Long.parseLong(number);
+            return List.of(new Token(number, TokenTypeColors.NUMBER));
+        } catch (NumberFormatException e) {
+            return new ArrayList<>();
+        }
+    }
+
+    private static List<Token> parseFloatingNumber(String current) {
+        int index = current.indexOf(' ');
+        String number = current;
+        if (index != -1) {
+            number = current.substring(0, index);
+        }
+        try {
+            Double.parseDouble(number);
+            return List.of(new Token(number, TokenTypeColors.NUMBER));
+        } catch (NumberFormatException e) {
+            return new ArrayList<>();
+        }
+    }
+
+    private static List<Token> parseBoolean(String current) {
+        int index = current.indexOf(' ');
+        String bool = current;
+        if (index != -1) {
+            bool = current.substring(0, index);
+        }
+        if ("true".equalsIgnoreCase(bool) || "false".equalsIgnoreCase(bool)) {
+            return List.of(new Token(bool, TokenTypeColors.BOOLEAN));
+        } else {
+            return new ArrayList<>();
+        }
+    }
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/ScriptSyntaxPacketParser.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/ScriptSyntaxPacketParser.java
new file mode 100644
index 0000000..abf09f6
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/ScriptSyntaxPacketParser.java
@@ -0,0 +1,78 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+public class ScriptSyntaxPacketParser {
+
+    private ScriptSyntaxPacketParser() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    private static final TokenType[] TOKEN_TYPES = TokenType.values();
+
+    private static void reset() {
+        Operators.OPERATORS.clear();
+        Headers.HEADERS.clear();
+        VariablePrefixes.RPEFIXES.clear();
+        VariableSuffixes.SUFFIXES.clear();
+        Commands.COMMANDS.clear();
+    }
+
+    public static synchronized void parse(String scriptSyntax) {
+        reset();
+
+        JsonObject jsonObject = JsonParser.parseString(scriptSyntax).getAsJsonObject();
+        for (String key : jsonObject.keySet()) {
+            JsonArray jsonElements = jsonObject.get(key).getAsJsonArray();
+            if (key.startsWith("@")) {
+                parseSpecial(key, jsonElements);
+            } else {
+                parseCommand(key, jsonElements);
+            }
+        }
+    }
+
+    private static void parseCommand(String key, JsonArray value) {
+        boolean repeating = value.get(0).getAsBoolean();
+        List<List<TokenType>> validArgumentTypes = new ArrayList<>();
+        for (int i = 1; i < value.size(); i++) {
+            JsonArray parameters = value.get(i).getAsJsonArray();
+            List<TokenType> parameterTypes = new ArrayList<>();
+            for (JsonElement parameter : parameters) {
+                parameterTypes.add(TOKEN_TYPES[parameter.getAsInt()]);
+            }
+            validArgumentTypes.add(parameterTypes);
+        }
+        Commands.COMMANDS.put(key, new Command(repeating, validArgumentTypes));
+    }
+
+    private static void parseSpecial(String key, JsonArray value) {
+        Set<String> set;
+        switch (key) {
+            case "@operators":
+                set = Operators.OPERATORS;
+                break;
+            case "@headers":
+                set = Headers.HEADERS;
+                break;
+            case "@prefixes":
+                set = VariablePrefixes.RPEFIXES;
+                break;
+            case "@suffixes":
+                set = VariableSuffixes.SUFFIXES;
+                break;
+            default:
+                return;
+        }
+        for (JsonElement element : value) {
+            set.add(element.getAsString());
+        }
+    }
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/Token.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/Token.java
new file mode 100644
index 0000000..6e7d022
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/Token.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+public class Token {
+    public static final Token SPACE = new Token(" ", 0xFFFFFFFF);
+
+    public final String text;
+    public final int color;
+
+    public Token(String text, int color) {
+        this.text = text;
+        this.color = color;
+    }
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/TokenType.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/TokenType.java
new file mode 100644
index 0000000..075646c
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/TokenType.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+public enum TokenType { // This is copied from the BauSystem2.0 sources.
+    any, // This does not include jump_point and variable
+    expression,
+    jump_point,
+    variable,
+
+    text_type,
+    number_type,
+    floating_number_type,
+    boolean_type,
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/TokenTypeColors.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/TokenTypeColors.java
new file mode 100644
index 0000000..71a5643
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/TokenTypeColors.java
@@ -0,0 +1,23 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+public class TokenTypeColors {
+
+    private TokenTypeColors() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static final int BACKGROUND = 0xFF1E1F22;
+    public static final int SELECTION = 0xFF23437F;
+    public static final int OTHER = 0xFFFFFFFF;
+
+    public static final int ERROR = 0xFFAA0000;
+
+    public static final int VARIABLE = 0xFFFFFFFF;
+    public static final int LITERAL = 0xFF925F35;
+    public static final int COMMENT = 0xFF656565;
+    public static final int JUMP_POINT = 0xFFFFa500;
+
+    public static final int NUMBER = 0xFF61839F;
+    public static final int BOOLEAN = 0xFF925F35;
+    public static final int TEXT = 0xFF6F855D;
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/VariablePrefixes.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/VariablePrefixes.java
new file mode 100644
index 0000000..631fd15
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/VariablePrefixes.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class VariablePrefixes {
+
+    private VariablePrefixes() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static final Set<String> RPEFIXES = new HashSet<>();
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/lexer/VariableSuffixes.java b/src/main/java/de/zonlykroks/advancedscripts/lexer/VariableSuffixes.java
new file mode 100644
index 0000000..d4d67f1
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/lexer/VariableSuffixes.java
@@ -0,0 +1,13 @@
+package de.zonlykroks.advancedscripts.lexer;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class VariableSuffixes {
+
+    private VariableSuffixes() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static final Set<String> SUFFIXES = new HashSet<>();
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/mixin/ClientPlayNetworkHandlerMixin.java b/src/main/java/de/zonlykroks/advancedscripts/mixin/ClientPlayNetworkHandlerMixin.java
new file mode 100644
index 0000000..3b9c457
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/mixin/ClientPlayNetworkHandlerMixin.java
@@ -0,0 +1,31 @@
+package de.zonlykroks.advancedscripts.mixin;
+
+import de.zonlykroks.advancedscripts.lexer.ScriptSyntaxPacketParser;
+import net.minecraft.client.network.ClientPlayNetworkHandler;
+import net.minecraft.network.PacketByteBuf;
+import net.minecraft.network.packet.s2c.play.CustomPayloadS2CPacket;
+import net.minecraft.util.Identifier;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ClientPlayNetworkHandler.class)
+public class ClientPlayNetworkHandlerMixin {
+
+    private static final Identifier CHANNEL = new Identifier("sw:script_syntax");
+
+    @Inject(method = "onCustomPayload", at = @At(value = "INVOKE", target = "Lnet/minecraft/network/packet/s2c/play/CustomPayloadS2CPacket;getData()Lnet/minecraft/network/PacketByteBuf;"), cancellable = true)
+    public void onCustomPayload(CustomPayloadS2CPacket packet, CallbackInfo ci) {
+        if (CHANNEL.equals(packet.getChannel())) {
+            PacketByteBuf buf = packet.getData();
+            int readableBytes = buf.readableBytes();
+            StringBuilder st = new StringBuilder();
+            for (int i = 0; i < readableBytes; i++) {
+                st.append((char) buf.readByte());
+            }
+            ScriptSyntaxPacketParser.parse(st.toString());
+            ci.cancel();
+        }
+    }
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/mixin/ClientPlayerEntityMixin.java b/src/main/java/de/zonlykroks/advancedscripts/mixin/ClientPlayerEntityMixin.java
new file mode 100644
index 0000000..4c00782
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/mixin/ClientPlayerEntityMixin.java
@@ -0,0 +1,28 @@
+package de.zonlykroks.advancedscripts.mixin;
+
+import de.zonlykroks.advancedscripts.screen.ScriptEditScreen;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.network.ClientPlayerEntity;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.util.Hand;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ClientPlayerEntity.class)
+public class ClientPlayerEntityMixin {
+
+    @Shadow @Final protected MinecraftClient client;
+
+    @Inject(method = "useBook", at = @At("HEAD"), cancellable = true)
+    public void useBookMixin(ItemStack book, Hand hand, CallbackInfo ci) {
+        if (book.isOf(Items.WRITABLE_BOOK)) {
+            this.client.setScreen(new ScriptEditScreen(((ClientPlayerEntity)(Object)this), book, hand));
+            ci.cancel();
+        }
+    }
+}
diff --git a/src/main/java/de/zonlykroks/advancedscripts/screen/ScriptEditScreen.java b/src/main/java/de/zonlykroks/advancedscripts/screen/ScriptEditScreen.java
new file mode 100644
index 0000000..b4daf11
--- /dev/null
+++ b/src/main/java/de/zonlykroks/advancedscripts/screen/ScriptEditScreen.java
@@ -0,0 +1,616 @@
+package de.zonlykroks.advancedscripts.screen;
+
+import com.mojang.blaze3d.systems.RenderSystem;
+import de.zonlykroks.advancedscripts.lexer.ScriptColorizer;
+import de.zonlykroks.advancedscripts.lexer.Token;
+import de.zonlykroks.advancedscripts.lexer.TokenTypeColors;
+import net.minecraft.client.font.TextHandler;
+import net.minecraft.client.gui.DrawableHelper;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.client.gui.screen.ingame.BookEditScreen;
+import net.minecraft.client.gui.screen.ingame.BookScreen;
+import net.minecraft.client.gui.screen.narration.NarrationMessageBuilder;
+import net.minecraft.client.gui.widget.PressableWidget;
+import net.minecraft.client.render.GameRenderer;
+import net.minecraft.client.util.NarratorManager;
+import net.minecraft.client.util.SelectionManager;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.nbt.NbtList;
+import net.minecraft.nbt.NbtString;
+import net.minecraft.network.packet.c2s.play.BookUpdateC2SPacket;
+import net.minecraft.text.Style;
+import net.minecraft.text.Text;
+import net.minecraft.util.Hand;
+import org.apache.commons.lang3.mutable.MutableInt;
+
+import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class ScriptEditScreen extends Screen {
+
+    private PlayerEntity player;
+    private ItemStack itemStack;
+    private Hand hand;
+
+    private List<String> lines = new ArrayList<>();
+    private int scroll = 0;
+    private int cursorY = 0;
+    private int cursorX = 0;
+
+    private int savedCursorY = -1;
+    private int savedCursorX = -1;
+
+    private int tickCounter;
+
+    private int keyCode = -1;
+    private long time;
+
+    public ScriptEditScreen(PlayerEntity player, ItemStack itemStack, Hand hand) {
+        super(NarratorManager.EMPTY);
+        this.player = player;
+        this.itemStack = itemStack;
+        this.hand = hand;
+
+        NbtCompound nbtCompound = itemStack.getNbt();
+        if (nbtCompound != null) {
+            BookScreen.filterPages(nbtCompound, s -> {
+                String[] split = s.split("\n");
+                for (String s1 : split) {
+                    if (s1.equals(" ")) {
+                        lines.add("");
+                    } else {
+                        lines.add(s1);
+                    }
+                }
+            });
+        }
+        if (lines.isEmpty()) {
+            lines.add("");
+        }
+    }
+
+    @Override
+    protected void init() {
+        this.addDrawableChild(
+                new Button(DONE, this.width / 2 - 98 / 2, height - 55, () -> {
+                    this.client.setScreen(null);
+                    finalizeBook();
+                })
+        );
+        this.addDrawableChild(
+                new Button(BOOK, this.width - 98 - 5, height - 20 - 5, () -> {
+                    finalizeBook();
+                    this.client.setScreen(new BookEditScreen(player, itemStack, hand));
+                })
+        );
+    }
+
+    public static final Text DONE = Text.translatable("gui.done");
+    public static final Text BOOK = Text.translatable("item.minecraft.book");
+
+    private static class Button extends PressableWidget {
+        private Runnable onPress;
+
+        public Button(Text text, int x, int y, Runnable onPress) {
+            super(x, y, 98, 20, text);
+            visible = true;
+            this.onPress = onPress;
+        }
+
+        @Override
+        public void onPress() {
+            onPress.run();
+        }
+
+        @Override
+        protected void appendClickableNarrations(NarrationMessageBuilder builder) {
+        }
+
+        @Override
+        public boolean isNarratable() {
+            return false;
+        }
+    }
+
+    private void setClipboard(String clipboard) {
+        if (this.client != null) {
+            SelectionManager.setClipboard(this.client, clipboard);
+        }
+
+    }
+
+    private String getClipboard() {
+        return this.client != null ? SelectionManager.getClipboard(this.client) : "";
+    }
+
+    @Override
+    public void tick() {
+        super.tick();
+        ++this.tickCounter;
+        if (keyCode != -1 && System.currentTimeMillis() - time > 500) {
+            key(keyCode);
+        }
+    }
+
+    @Override
+    public void render(MatrixStack matrices, int mouseX, int mouseY, float delta) {
+        this.renderBackground(matrices);
+        RenderSystem.setShader(GameRenderer::getPositionTexProgram);
+        RenderSystem.setShaderColor(1.0F, 1.0F, 1.0F, 1.0F);
+        fill(matrices, 23, 23, this.width - 23, this.height - 63, TokenTypeColors.BACKGROUND);
+
+        int lineNumberLength = textRenderer.getWidth(lines.size() + "");
+
+        boolean hasSelection = savedCursorY != -1 && savedCursorX != -1;
+        int minSelectionY = Math.min(cursorY, savedCursorY);
+        int maxSelectionY = Math.max(cursorY, savedCursorY);
+        int minSelectionX = (minSelectionY == maxSelectionY ? Math.min(cursorX, savedCursorX) : (minSelectionY == cursorY ? cursorX : savedCursorX));
+        int maxSelectionX = (minSelectionY == maxSelectionY ? Math.max(cursorX, savedCursorX) : (maxSelectionY == cursorY ? cursorX : savedCursorX));
+
+        int lineNumberText = scroll + 1;
+        MutableInt lineNumber = new MutableInt();
+        TextHandler textHandler = this.textRenderer.getTextHandler();
+        for (int i = scroll; i < lines.size(); i++) {
+            String s = lines.get(i);
+
+            if (lineNumber.getValue() * 9 + 25 > this.height - 66) {
+                break;
+            }
+
+            if (s.isEmpty() && i == cursorY) {
+                drawCursor(matrices, 25 + lineNumberLength + 5, lineNumber.getValue() * 9 + 25, true);
+            }
+
+            // Line number
+            int height = this.textRenderer.getWrappedLinesHeight(s, this.width - 50 - lineNumberLength - 5);
+            if (lineTooLong(s)) {
+                fill(matrices, 25 + lineNumberLength + 2, 25 + lineNumber.getValue() * 9, 25 + lineNumberLength + 3, 25 + lineNumber.getValue() * 9 + height, TokenTypeColors.ERROR);
+            }
+            this.textRenderer.draw(matrices, lineNumberText + "", 25 + lineNumberLength - textRenderer.getWidth(lineNumberText + ""), 25 + lineNumber.getValue() * 9, 0xFFFFFF);
+            lineNumberText++;
+
+            // Line text
+            List<Token> tokens = ScriptColorizer.colorize(lineNumber.getValue(), s);
+            AtomicInteger x = new AtomicInteger(25 + lineNumberLength + 5);
+            AtomicInteger currentXIndex = new AtomicInteger(0);
+            for (Token token : tokens) {
+                int finalI = i;
+                textHandler.wrapLines(token.text, this.width - x.get() - 25, Style.EMPTY, true, (style, start, end) -> {
+                    int y = lineNumber.getValue() * 9;
+                    if (y + 25 > this.height - 66) {
+                        return;
+                    }
+
+                    String line = token.text.substring(start, end);
+                    int previousXIndex = currentXIndex.get();
+                    currentXIndex.addAndGet(line.length());
+
+                    if (hasSelection) {
+                        int x1 = x.get();
+                        int x2 = x.get() + textRenderer.getWidth(line);
+
+                        if (finalI == minSelectionY) {
+                            if (minSelectionX > currentXIndex.get()) {
+                                x2 = 0;
+                            } else if (minSelectionX <= currentXIndex.get() && minSelectionX >= previousXIndex) {
+                                int startInLine = minSelectionX - previousXIndex;
+                                x1 += textRenderer.getWidth(line.substring(0, startInLine));
+                            }
+                        }
+                        if (finalI == maxSelectionY) {
+                            if (maxSelectionX < previousXIndex) {
+                                x2 = 0;
+                            } else if (maxSelectionX <= currentXIndex.get()) {
+                                int endInLine = maxSelectionX - previousXIndex;
+                                x2 = x.get() + textRenderer.getWidth(line.substring(0, endInLine));
+                            }
+                        }
+
+                        if (finalI >= minSelectionY && finalI <= maxSelectionY && x2 > x1) {
+                            fill(matrices, x1, y + 25, x2, y + 25 + 9, TokenTypeColors.SELECTION);
+                        }
+                    }
+
+                    if (finalI == cursorY && currentXIndex.get() >= cursorX && previousXIndex <= cursorX) {
+                        drawCursor(matrices, x.get() + textRenderer.getWidth(line.substring(0, cursorX - previousXIndex)) - 1, 25 + y, isAtEndOfLine());
+                    }
+
+                    this.textRenderer.draw(matrices, line, x.get(), 25 + y, token.color);
+                    x.addAndGet(textRenderer.getWidth(line));
+                    if (x.get() > this.width - 50 - lineNumberLength - 5) {
+                        x.set(25 + lineNumberLength + 5);
+                        lineNumber.increment();
+                    }
+                });
+            }
+            lineNumber.increment();
+        }
+
+        super.render(matrices, mouseX, mouseY, delta);
+    }
+
+    private boolean lineTooLong(String s) {
+        if (s.length() >= 1024) {
+            return true;
+        }
+        return textRenderer.getWrappedLinesHeight(s, 114) > 128;
+    }
+
+    private void drawCursor(MatrixStack matrices, int x, int y, boolean atEnd) {
+        if (this.tickCounter / 6 % 2 == 0) {
+            if (!atEnd) {
+                Objects.requireNonNull(this.textRenderer);
+                DrawableHelper.fill(matrices, x, y - 1, x + 1, y + 9, 0xFFFFFFFF);
+            } else {
+                this.textRenderer.draw(matrices, "_", (float) x, (float) y, 0xFFFFFFFF);
+            }
+        }
+
+    }
+
+    private void key(int keyCode) {
+        if (Screen.isSelectAll(keyCode)) {
+            this.cursorX = 0;
+            this.cursorY = 0;
+            this.savedCursorX = lines.get(lines.size() - 1).length();
+            this.savedCursorY = lines.size() - 1;
+            return;
+        } else if (Screen.isCopy(keyCode)) {
+            String copied = selection(false);
+            if (copied != null) {
+                setClipboard(copied);
+            }
+            return;
+        } else if (Screen.isPaste(keyCode)) {
+            String copied = getClipboard();
+            if (copied != null) {
+                insert(copied);
+            }
+            return;
+        } else if (Screen.isCut(keyCode)) {
+            String copied = selection(true);
+            if (copied != null) {
+                setClipboard(copied);
+            }
+            return;
+        }
+        SelectionManager.SelectionType selectionType = Screen.hasControlDown() ? SelectionManager.SelectionType.WORD : SelectionManager.SelectionType.CHARACTER;
+        boolean valid = true;
+        int previousCursorX = cursorX;
+        int previousCursorY = cursorY;
+        switch (keyCode) {
+            case 257:
+            case 335:
+                selection(true);
+                newLine();
+                valid = false;
+                break;
+            case 259:
+                if (selection(true) == null) backspace(selectionType);
+                valid = false;
+                break;
+            case 261:
+                if (selection(true) == null) delete(selectionType);
+                valid = false;
+                break;
+            case 262:
+                moveCursor(1, selectionType);
+                valid = Screen.hasShiftDown();
+                break;
+            case 263:
+                moveCursor(-1, selectionType);
+                valid = Screen.hasShiftDown();
+                break;
+            case 264:
+                moveDown();
+                valid = Screen.hasShiftDown();
+                break;
+            case 265:
+                moveUp();
+                valid = Screen.hasShiftDown();
+                break;
+            case 268:
+                cursorX = 0;
+                valid = Screen.hasShiftDown();
+                break;
+            case 269:
+                cursorX = lines.get(cursorY).length();
+                valid = Screen.hasShiftDown();
+                break;
+            default:
+                break;
+        }
+        if (valid) {
+            if (Screen.hasShiftDown() && savedCursorX == -1 && savedCursorY == -1) {
+                savedCursorX = previousCursorX;
+                savedCursorY = previousCursorY;
+            }
+        } else {
+            savedCursorY = -1;
+            savedCursorX = -1;
+        }
+        autoScroll();
+    }
+
+    @Override
+    public boolean keyPressed(int keyCode, int scanCode, int modifiers) {
+        if (super.keyPressed(keyCode, scanCode, modifiers)) {
+            return true;
+        }
+        key(keyCode);
+        this.keyCode = keyCode;
+        this.time = System.currentTimeMillis();
+        return true;
+    }
+
+    @Override
+    public boolean keyReleased(int keyCode, int scanCode, int modifiers) {
+        this.keyCode = -1;
+        return super.keyReleased(keyCode, scanCode, modifiers);
+    }
+
+    @Override
+    public boolean charTyped(char chr, int modifiers) {
+        if (super.charTyped(chr, modifiers)) {
+            return true;
+        }
+        selection(true);
+        boolean valid = insert(chr + "");
+        savedCursorY = -1;
+        savedCursorX = -1;
+        autoScroll();
+        return valid;
+    }
+
+    private String selection(boolean remove) {
+        if (savedCursorX == -1 || savedCursorY == -1) {
+            return null;
+        }
+        int minSelectionY = Math.min(savedCursorY, cursorY);
+        int maxSelectionY = Math.max(savedCursorY, cursorY);
+        int minSelectionX = (minSelectionY == maxSelectionY ? Math.min(cursorX, savedCursorX) : (minSelectionY == cursorY ? cursorX : savedCursorX));
+        int maxSelectionX = (minSelectionY == maxSelectionY ? Math.max(cursorX, savedCursorX) : (maxSelectionY == cursorY ? cursorX : savedCursorX));
+
+        StringBuilder builder = new StringBuilder();
+        for (int i = minSelectionY; i <= maxSelectionY; i++) {
+            String line = lines.get(i);
+            if (i == minSelectionY && i == maxSelectionY) {
+                builder.append(line, minSelectionX, maxSelectionX);
+            } else if (i == minSelectionY) {
+                builder.append(line, minSelectionX, line.length());
+            } else if (i == maxSelectionY) {
+                builder.append(line, 0, Math.min(maxSelectionX, line.length()));
+            } else {
+                builder.append(line);
+            }
+            if (i != maxSelectionY) {
+                builder.append("\n");
+            }
+        }
+        if (remove) {
+            for (int i = maxSelectionY; i >= minSelectionY; i--) {
+                String line = lines.get(i);
+                if (i == minSelectionY && i == maxSelectionY) {
+                    lines.set(i, line.substring(0, minSelectionX) + line.substring(maxSelectionX));
+                } else if (i == minSelectionY) {
+                    lines.set(i, line.substring(0, minSelectionX));
+                } else if (i == maxSelectionY) {
+                    lines.set(i, line.substring(Math.min(maxSelectionX, line.length())));
+                } else {
+                    lines.remove(i);
+                }
+            }
+            if (minSelectionY != maxSelectionY) {
+                lines.set(minSelectionY, lines.get(minSelectionY) + lines.get(minSelectionY + 1));
+                lines.remove(minSelectionY + 1);
+            }
+            cursorX = minSelectionX;
+            cursorY = minSelectionY;
+            savedCursorX = -1;
+            savedCursorY = -1;
+        }
+        return builder.toString();
+    }
+
+    private boolean insert(String s) {
+        String[] split = s.split("\n");
+        for (int i = 0; i < split.length; i++) {
+            String line = lines.get(cursorY);
+            if (cursorX == line.length()) {
+                line += split[i];
+            } else {
+                line = line.substring(0, cursorX) + split[i] + line.substring(cursorX);
+            }
+            lines.set(cursorY, line);
+            cursorX += split[i].length();
+            if (i != split.length - 1) {
+                newLine();
+            }
+        }
+        return true;
+    }
+
+    private boolean newLine() {
+        String line = lines.get(cursorY);
+        String newLine = line.substring(cursorX);
+        line = line.substring(0, cursorX);
+        lines.set(cursorY, line);
+        lines.add(cursorY + 1, newLine);
+        cursorY++;
+        cursorX = 0;
+        return true;
+    }
+
+    private boolean backspace(SelectionManager.SelectionType selectionType) {
+        if (cursorX == 0) {
+            if (cursorY == 0) {
+                return true;
+            }
+            String previousLine = lines.get(cursorY - 1);
+            lines.set(cursorY - 1, lines.get(cursorY - 1) + lines.remove(cursorY));
+            cursorY--;
+            cursorX = previousLine.length();
+        } else {
+            String line = lines.get(cursorY);
+            int remove = selectionType == SelectionManager.SelectionType.CHARACTER ? 1 : getWordLength(line, cursorX, -1);
+            line = line.substring(0, cursorX - remove) + line.substring(cursorX);
+            lines.set(cursorY, line);
+            cursorX -= remove;
+        }
+        return true;
+    }
+
+    private boolean delete(SelectionManager.SelectionType selectionType) {
+        if (cursorX == lines.get(cursorY).length()) {
+            if (cursorY == lines.size() - 1) {
+                return true;
+            }
+            String nextLine = lines.get(cursorY + 1);
+            lines.remove(cursorY);
+            lines.set(cursorY, lines.get(cursorY) + nextLine);
+        } else {
+            String line = lines.get(cursorY);
+            int remove = selectionType == SelectionManager.SelectionType.CHARACTER ? 1 : getWordLength(line, cursorX, 1);
+            line = line.substring(0, cursorX) + line.substring(cursorX + remove);
+            lines.set(cursorY, line);
+        }
+        return true;
+    }
+
+    private int getWordLength(String line, int cursorX, int direction) {
+        int i = cursorX;
+        while (i >= 0 && i < line.length()) {
+            char c = line.charAt(i);
+            if (Character.isLetterOrDigit(c)) {
+                i += direction;
+            } else {
+                break;
+            }
+        }
+        return Math.abs(i - cursorX);
+    }
+
+    private boolean moveCursor(int offset, SelectionManager.SelectionType selectionType) {
+        if (offset == 0) {
+            return true;
+        }
+        String line = lines.get(cursorY);
+        if (offset > 0) {
+            if (cursorX == line.length()) {
+                if (cursorY == lines.size() - 1) {
+                    return true;
+                }
+                cursorY++;
+                cursorX = 0;
+            } else {
+                cursorX += selectionType == SelectionManager.SelectionType.CHARACTER ? 1 : getWordLength(line, cursorX, 1);
+            }
+        } else {
+            if (cursorX == 0) {
+                if (cursorY == 0) {
+                    return true;
+                }
+                cursorY--;
+                cursorX = lines.get(cursorY).length();
+            } else {
+                cursorX -= selectionType == SelectionManager.SelectionType.CHARACTER ? 1 : getWordLength(line, cursorX, -1);
+            }
+        }
+        return true;
+    }
+
+    private boolean moveDown() {
+        if (cursorY == lines.size() - 1) {
+            cursorX = lines.get(cursorY).length();
+            return true;
+        }
+        cursorY++;
+        cursorX = Math.min(cursorX, lines.get(cursorY).length());
+        return true;
+    }
+
+    private boolean moveUp() {
+        if (cursorY == 0) {
+            cursorX = 0;
+            return true;
+        }
+        cursorY--;
+        cursorX = Math.min(cursorX, lines.get(cursorY).length());
+        return true;
+    }
+
+    private void autoScroll() {
+        if (cursorY < scroll) {
+            scroll = cursorY;
+        } else if (cursorY >= scroll + ((this.height - 25 - 66) / 9)) {
+            scroll = cursorY - ((this.height - 25 - 66) / 9);
+        }
+    }
+
+    private boolean isAtEndOfLine() {
+        return cursorX == lines.get(cursorY).length();
+    }
+
+    @Override
+    public boolean mouseScrolled(double mouseX, double mouseY, double amount) {
+        scroll -= Math.signum(amount);
+        if (scroll > lines.size() - 1) {
+            scroll = lines.size() - 1;
+        }
+        if (scroll < 0) {
+            scroll = 0;
+        }
+        return true;
+    }
+
+    @Override
+    public boolean mouseClicked(double mouseX, double mouseY, int button) {
+        return super.mouseClicked(mouseX, mouseY, button);
+    }
+
+    private List<String> toPages() {
+        List<String> pages = new ArrayList<>();
+        StringBuilder page = new StringBuilder();
+        for (String line : lines) {
+            if (!page.isEmpty()) {
+                page.append("\n");
+            }
+            if (page.length() + line.length() > 1024) {
+                pages.add(page.toString());
+                page = new StringBuilder();
+            }
+            String temp = page + line;
+            if (textRenderer.getWrappedLinesHeight(temp, 114) > 128) {
+                pages.add(page.toString());
+                page = new StringBuilder();
+            }
+            if (line.isEmpty()) {
+                page.append(" ");
+            } else {
+                page.append(line);
+            }
+        }
+        if (!page.isEmpty()) {
+            pages.add(page.toString());
+        }
+        return pages;
+    }
+
+    private void finalizeBook() {
+        List<String> pages = toPages();
+        this.writeNbtData(pages);
+        int i = this.hand == Hand.MAIN_HAND ? this.player.getInventory().selectedSlot : 40;
+        this.client.getNetworkHandler().sendPacket(new BookUpdateC2SPacket(i, pages, Optional.empty()));
+    }
+
+    private void writeNbtData(List<String> pages) {
+        NbtList nbtList = new NbtList();
+        pages.stream().map(NbtString::of).forEach(nbtList::add);
+        if (!pages.isEmpty()) {
+            this.itemStack.setSubNbt("pages", nbtList);
+        }
+    }
+}
diff --git a/src/main/resources/advancedscripts.mixins.json b/src/main/resources/advancedscripts.mixins.json
index a4b8220..4f89400 100644
--- a/src/main/resources/advancedscripts.mixins.json
+++ b/src/main/resources/advancedscripts.mixins.json
@@ -6,7 +6,9 @@
   "mixins": [
   ],
   "client": [
-    "KeyboardMixin"
+    "KeyboardMixin",
+    "ClientPlayerEntityMixin",
+    "ClientPlayNetworkHandlerMixin"
   ],
   "injectors": {
     "defaultRequire": 1