diff --git a/CMakeLists.txt b/CMakeLists.txt
index ebfdf004d..69fe6e6fe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,9 +20,10 @@ add_executable(ImHex
         source/utils.cpp
         source/crypto.cpp
 
-        source/parser/lexer.cpp
-        source/parser/parser.cpp
-        source/parser/validator.cpp
+        source/lang/preprocessor.cpp
+        source/lang/lexer.cpp
+        source/lang/parser.cpp
+        source/lang/validator.cpp
 
         source/provider/file_provider.cpp
 
diff --git a/include/hex.hpp b/include/hex.hpp
index 2fa60bbfb..7d95cf731 100644
--- a/include/hex.hpp
+++ b/include/hex.hpp
@@ -15,5 +15,5 @@ using s32   = std::int32_t;
 using s64   = std::int64_t;
 using s128  = __int128_t;
 
-#include "parser/result.hpp"
-#include "parser/results.hpp"
\ No newline at end of file
+#include "lang/result.hpp"
+#include "lang/results.hpp"
\ No newline at end of file
diff --git a/include/parser/ast_node.hpp b/include/lang/ast_node.hpp
similarity index 100%
rename from include/parser/ast_node.hpp
rename to include/lang/ast_node.hpp
diff --git a/include/parser/lexer.hpp b/include/lang/lexer.hpp
similarity index 100%
rename from include/parser/lexer.hpp
rename to include/lang/lexer.hpp
diff --git a/include/parser/parser.hpp b/include/lang/parser.hpp
similarity index 100%
rename from include/parser/parser.hpp
rename to include/lang/parser.hpp
diff --git a/include/lang/preprocessor.hpp b/include/lang/preprocessor.hpp
new file mode 100644
index 000000000..35640beba
--- /dev/null
+++ b/include/lang/preprocessor.hpp
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <hex.hpp>
+
+#include "token.hpp"
+
+#include <string>
+#include <utility>
+#include <set>
+
+namespace hex::lang {
+
+    class Preprocessor {
+    public:
+        Preprocessor();
+
+        std::pair<Result, std::string> preprocess(const std::string& code, bool applyDefines = true);
+
+    private:
+        std::set<std::pair<std::string, std::string>> m_defines;
+    };
+
+}
\ No newline at end of file
diff --git a/include/parser/result.hpp b/include/lang/result.hpp
similarity index 100%
rename from include/parser/result.hpp
rename to include/lang/result.hpp
diff --git a/include/lang/results.hpp b/include/lang/results.hpp
new file mode 100644
index 000000000..8ba760b05
--- /dev/null
+++ b/include/lang/results.hpp
@@ -0,0 +1,13 @@
+#pragma once
+
+#include "result.hpp"
+
+namespace hex::lang {
+
+    constexpr Result ResultSuccess(0, 0);
+
+    constexpr Result ResultPreprocessingError(1, 1);
+    constexpr Result ResultLexicalError(2, 1);
+    constexpr Result ResultParseError(3, 1);
+
+}
\ No newline at end of file
diff --git a/include/parser/token.hpp b/include/lang/token.hpp
similarity index 100%
rename from include/parser/token.hpp
rename to include/lang/token.hpp
diff --git a/include/parser/validator.hpp b/include/lang/validator.hpp
similarity index 100%
rename from include/parser/validator.hpp
rename to include/lang/validator.hpp
diff --git a/include/parser/results.hpp b/include/parser/results.hpp
deleted file mode 100644
index eceac7304..000000000
--- a/include/parser/results.hpp
+++ /dev/null
@@ -1,12 +0,0 @@
-#pragma once
-
-#include "result.hpp"
-
-namespace hex::lang {
-
-    constexpr Result ResultSuccess(0, 0);
-
-    constexpr Result ResultLexicalError(1, 1);
-    constexpr Result ResultParseError(2, 1);
-
-}
\ No newline at end of file
diff --git a/include/utils.hpp b/include/utils.hpp
index 8f8c6d6b2..0e3aa27af 100644
--- a/include/utils.hpp
+++ b/include/utils.hpp
@@ -8,7 +8,7 @@
 #include <memory>
 #include <vector>
 
-#include "parser/token.hpp"
+#include "lang/token.hpp"
 
 namespace hex {
 
diff --git a/include/views/view_pattern.hpp b/include/views/view_pattern.hpp
index 952a34d7f..8bcaa1a58 100644
--- a/include/views/view_pattern.hpp
+++ b/include/views/view_pattern.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "parser/ast_node.hpp"
+#include "lang/ast_node.hpp"
 
 #include "views/view.hpp"
 #include "views/pattern_data.hpp"
diff --git a/source/parser/lexer.cpp b/source/lang/lexer.cpp
similarity index 99%
rename from source/parser/lexer.cpp
rename to source/lang/lexer.cpp
index b97623180..11aa9d3d4 100644
--- a/source/parser/lexer.cpp
+++ b/source/lang/lexer.cpp
@@ -1,4 +1,4 @@
-#include "parser/lexer.hpp"
+#include "lang/lexer.hpp"
 
 #include <vector>
 #include <functional>
diff --git a/source/parser/parser.cpp b/source/lang/parser.cpp
similarity index 99%
rename from source/parser/parser.cpp
rename to source/lang/parser.cpp
index 4695ed54e..ca78c6f38 100644
--- a/source/parser/parser.cpp
+++ b/source/lang/parser.cpp
@@ -1,4 +1,4 @@
-#include "parser/parser.hpp"
+#include "lang/parser.hpp"
 
 #include <optional>
 
diff --git a/source/lang/preprocessor.cpp b/source/lang/preprocessor.cpp
new file mode 100644
index 000000000..d54090b9a
--- /dev/null
+++ b/source/lang/preprocessor.cpp
@@ -0,0 +1,120 @@
+#include "lang/preprocessor.hpp"
+
+namespace hex::lang {
+
+    Preprocessor::Preprocessor() {
+
+    }
+
+    std::pair<Result, std::string> Preprocessor::preprocess(const std::string& code, bool applyDefines) {
+        u32 offset = 0;
+
+        if (applyDefines)
+            this->m_defines.clear();
+
+        std::string output;
+        output.reserve(code.length());
+
+        while (offset < code.length()) {
+            if (code[offset] == '#') {
+                offset += 1;
+
+                if (code.substr(offset, 7) == "include") {
+                    offset += 7;
+
+                    while (std::isblank(code[offset]) || std::isspace(code[offset]))
+                        offset += 1;
+
+                    if (code[offset] != '<' && code[offset] != '"')
+                        return { ResultPreprocessingError, "" };
+
+                    char endChar = code[offset];
+                    if (endChar == '<') endChar = '>';
+
+                    offset += 1;
+
+                    std::string includeFile;
+                    while (code[offset] != endChar) {
+                        includeFile += code[offset];
+                        offset += 1;
+
+                        if (offset >= code.length())
+                            return { ResultPreprocessingError, "" };
+                    }
+                    offset += 1;
+
+                    if (includeFile[0] != '/')
+                        includeFile = "include/" + includeFile;
+
+                    FILE *file = fopen(includeFile.c_str(), "r");
+                    if (file == nullptr)
+                        return { ResultPreprocessingError, "" };
+
+                    fseek(file, 0, SEEK_END);
+                    size_t size = ftell(file);
+                    char *buffer = new char[size + 1];
+                    rewind(file);
+
+                    fread(buffer, size, 1, file);
+                    buffer[size] = 0x00;
+
+                    auto [result, preprocessedInclude] = this->preprocess(buffer, false);
+                    if (result.failed())
+                        return { ResultPreprocessingError, "" };
+
+                    output += preprocessedInclude;
+
+                    delete[] buffer;
+
+                    fclose(file);
+                } else if (code.substr(offset, 6) == "define") {
+                    offset += 6;
+
+                    while (std::isblank(code[offset]))
+                        offset += 1;
+
+                    std::string defineName;
+                    while (!std::isblank(code[offset])) {
+                        defineName += code[offset];
+                        offset += 1;
+
+                        if (offset >= code.length() || code[offset] == '\n' || code[offset] == '\r')
+                            return { ResultPreprocessingError, "" };
+                    }
+
+                    while (std::isblank(code[offset]))
+                        offset += 1;
+
+                    std::string replaceValue;
+                    do {
+                        if (offset >= code.length())
+                            return { ResultPreprocessingError, "" };
+
+                        replaceValue += code[offset];
+                        offset += 1;
+                    } while (code[offset] != '\n' && code[offset] != '\r');
+
+                    this->m_defines.emplace(defineName, replaceValue);
+                }
+            }
+
+            output += code[offset];
+            offset += 1;
+        }
+
+        if (applyDefines) {
+            for (const auto &[define, value] : this->m_defines) {
+                s32 index = 0;
+                while((index = output.find(define, index)) != std::string::npos) {
+                    if (index > 0) {
+                        output.replace(index, define.length(), value);
+                        index += value.length();
+                    }
+                }
+            }
+        }
+
+        return { ResultSuccess, output };
+    }
+
+}
\ No newline at end of file
diff --git a/source/views/view_pattern.cpp b/source/views/view_pattern.cpp
index c9859eb18..053df8f68 100644
--- a/source/views/view_pattern.cpp
+++ b/source/views/view_pattern.cpp
@@ -1,9 +1,9 @@
 #include "views/view_pattern.hpp"
-#include <random>
 
-#include "parser/parser.hpp"
-#include "parser/lexer.hpp"
-#include "parser/validator.hpp"
+#include "lang/preprocessor.hpp"
+#include "lang/parser.hpp"
+#include "lang/lexer.hpp"
+#include "lang/validator.hpp"
 #include "utils.hpp"
 
 namespace hex {
@@ -98,6 +98,7 @@ namespace hex {
             delete data;
 
         this->m_patternData.clear();
+        PatternData::resetPalette();
     }
 
     template<std::derived_from<lang::ASTNode> T>
@@ -112,6 +113,7 @@ namespace hex {
     }
 
     void ViewPattern::parsePattern(char *buffer) {
+        static hex::lang::Preprocessor preprocessor;
         static hex::lang::Lexer lexer;
         static hex::lang::Parser parser;
         static hex::lang::Validator validator;
@@ -119,8 +121,11 @@ namespace hex {
         this->clearPatternData();
         this->postEvent(Events::PatternChanged);
 
-        auto [lexResult, tokens] = lexer.lex(buffer);
+        auto [preprocessingResult, preprocesedCode] = preprocessor.preprocess(buffer);
+        if (preprocessingResult.failed())
+            return;
 
+        auto [lexResult, tokens] = lexer.lex(preprocesedCode);
         if (lexResult.failed()) {
             return;
         }