commit 2e55268805deb6a7d9d08aaeac925c69774c597f
Author: Ilja Kovalovs <ilja.kovalovs@gmail.com>
Date:   Wed Oct 15 17:20:56 2025 +0200

    Initial commit

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..b9c7c32
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.14)
+
+project(Interpreter)
+
+set(CXX_STANDARD 20)
+
+add_subdirectory(Parser)
+
+add_subdirectory(Program)
diff --git a/Parser/CMakeLists.txt b/Parser/CMakeLists.txt
new file mode 100644
index 0000000..a776c14
--- /dev/null
+++ b/Parser/CMakeLists.txt
@@ -0,0 +1,9 @@
+add_library(
+        Parser
+        Parser.h
+        Parser.cpp
+        Lexer.h
+        Lexer.cpp
+)
+
+target_include_directories(Parser PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/")
\ No newline at end of file
diff --git a/Parser/Expression/Binary.h b/Parser/Expression/Binary.h
new file mode 100644
index 0000000..1fdca14
--- /dev/null
+++ b/Parser/Expression/Binary.h
@@ -0,0 +1,20 @@
+#include "Expression.h"
+#include "Lexer.h"
+#include <memory>
+
+namespace Parser
+{
+    struct Binary : public Expression
+    {
+        std::unique_ptr<Expression> left;
+        std::unique_ptr<Expression> right;
+        Lexer::Token::TokenType op;
+
+        Binary(std::unique_ptr<Expression>&& left, std::unique_ptr<Expression>&& right, Lexer::Token::TokenType op) : Expression()
+        {
+            this->left = std::move(left);
+            this->right = std::move(right);
+            this->op = op;
+        }
+    };
+}
\ No newline at end of file
diff --git a/Parser/Expression/Expression.h b/Parser/Expression/Expression.h
new file mode 100644
index 0000000..6405cb9
--- /dev/null
+++ b/Parser/Expression/Expression.h
@@ -0,0 +1,3 @@
+namespace Parser{
+struct Expression{};
+}
\ No newline at end of file
diff --git a/Parser/Expression/Grouping.h b/Parser/Expression/Grouping.h
new file mode 100644
index 0000000..119a840
--- /dev/null
+++ b/Parser/Expression/Grouping.h
@@ -0,0 +1,12 @@
+#include "Expression.h"
+#include <memory>
+
+namespace Parser
+{
+    struct Grouping : public Expression{
+        std::unique_ptr<Expression> expr;
+        Grouping(std::unique_ptr<Expression>&& expr) : Expression(){
+            this->expr = std::move(expr);
+        };
+    };
+}
diff --git a/Parser/Lexer.cpp b/Parser/Lexer.cpp
new file mode 100644
index 0000000..b553390
--- /dev/null
+++ b/Parser/Lexer.cpp
@@ -0,0 +1,122 @@
+#include "Lexer.h"
+#include <iostream>
+
+namespace Parser
+{
+    using Parser::Lexer;
+    std::list<Lexer::Token> Lexer::tokenize(const std::string_view &text)
+    {
+        tokens.clear();
+        this->text = text;
+
+        while (current != text.length())
+        {
+            if (text.at(current) == ' ')
+            {
+                advance();
+                continue;
+            }
+            if (text.at(current) == '\n')
+            {
+                advance();
+                line++;
+                continue;
+            }
+
+            start = current;
+
+            switch (Lexer::peek())
+            {
+            case '+':
+                advance();
+                token(Token::PLUS);
+                break;
+            case '-':
+                advance();
+                token(Token::MINUS);
+                break;
+            case '*':
+                advance();
+                token(Token::MULTIPLY);
+                break;
+            case '/':
+                advance();
+                token(Token::DIVIDE);
+                break;
+            case '=':
+                advance();
+                token(Token::ASSIGNMENT);
+                break;
+            case '(':
+                advance();
+                token(Token::BRACKET_LEFT);
+                break;
+            case ')':
+                advance();
+                token(Token::BRACKET_RIGHT);
+                break;
+
+            default:
+                if (isDigit(peek()))
+                {
+                    advance();
+                    number();
+                }
+
+                if (isAlpha(peek()))
+                {
+                    advance();
+                    identifier();
+                }
+            }
+        }
+
+        return tokens;
+    }
+    void Lexer::advance()
+    {
+        current++;
+    }
+
+    char Lexer::peek()
+    {
+        if (current == text.length())
+            return 0;
+        return text.at(current);
+    }
+
+    void Lexer::token(const Token::TokenType type)
+    {
+        tokens.emplace_back(Token(type, line, text.substr(start, (current - start))));
+    }
+
+    bool Lexer::isDigit(const char &c)
+    {
+        return c >= '0' && c <= '9';
+    }
+
+    void Lexer::number()
+    {
+        while (isDigit(peek()))
+        {
+            advance();
+        }
+
+        token(Token::INT);
+    }
+
+    bool Lexer::isAlpha(const char &c)
+    {
+        return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));
+    }
+
+    void Lexer::identifier()
+    {
+        while (isAlpha(peek()) || isDigit(peek()))
+        {
+            advance();
+        }
+
+        token(Token::IDENTIFIER);
+    }
+}
\ No newline at end of file
diff --git a/Parser/Lexer.h b/Parser/Lexer.h
new file mode 100644
index 0000000..4ba7365
--- /dev/null
+++ b/Parser/Lexer.h
@@ -0,0 +1,66 @@
+#pragma once
+#include <list>
+#include <string_view>
+#include <ranges>
+#include <sys/types.h>
+#include <string>
+
+namespace Parser
+{
+    class Lexer
+    {
+    public:
+        struct Token
+        {
+            enum TokenType
+            {
+                INT,
+                PLUS,
+                MINUS,
+                MULTIPLY,
+                DIVIDE,
+                ASSIGNMENT,
+                BRACKET_LEFT,
+                BRACKET_RIGHT,
+                IDENTIFIER
+            };
+
+            TokenType type;
+            uint line;
+            std::string_view occurence;
+
+            Token(TokenType type, uint line, std::string_view&& str)
+            {
+                this->type = type;
+                this->line = line;
+                occurence = str;
+            }
+
+            std::string toString(){
+                return std::to_string(type) + " " + std::string(occurence);
+            }
+        };
+
+        Lexer() = default;
+        std::list<Lexer::Token> tokenize(const std::string_view &text);
+
+    private:
+        uint current{};
+        uint start{};
+        uint line{};
+
+        std::string_view text;
+        std::list<Token> tokens;
+
+        
+
+    private:
+        void identifier();
+        bool isAlpha(const char& c);
+        bool isDigit(const char& c);
+        void number();
+        void advance();
+        char peek();
+        void token(const Token::TokenType type);
+    };
+}
\ No newline at end of file
diff --git a/Parser/Parser.cpp b/Parser/Parser.cpp
new file mode 100644
index 0000000..27030e7
--- /dev/null
+++ b/Parser/Parser.cpp
@@ -0,0 +1,9 @@
+#include "Parser.h"
+#include <iostream>
+
+namespace Parser{
+    void Parser::parse(std::string_view source) {
+        lexer.tokenize(source);
+        
+    }
+}
\ No newline at end of file
diff --git a/Parser/Parser.h b/Parser/Parser.h
new file mode 100644
index 0000000..6c763a3
--- /dev/null
+++ b/Parser/Parser.h
@@ -0,0 +1,18 @@
+#pragma once
+#include "Lexer.h"
+#include "Expression/Expression.h"
+
+namespace Parser
+{
+    class Parser
+    {
+        Lexer lexer;
+        std::string_view source;
+        std::list<Expression> exprs;
+public:
+        Parser() = default;
+        void parse(std::string_view source);
+private:
+        generateAST();
+    };
+};
\ No newline at end of file
diff --git a/Program/CMakeLists.txt b/Program/CMakeLists.txt
new file mode 100644
index 0000000..6438568
--- /dev/null
+++ b/Program/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_executable(Interpreter main.cpp)
+
+target_link_libraries(Interpreter PRIVATE Parser)
diff --git a/Program/main.cpp b/Program/main.cpp
new file mode 100644
index 0000000..a1b59bc
--- /dev/null
+++ b/Program/main.cpp
@@ -0,0 +1,10 @@
+#include <iostream>
+#include "Parser.h"
+
+int main() {
+    Parser::Parser parser;
+
+    std::string input = "123 + 5432 - 33 / 434 (asd)";
+
+    parser.parse(input);
+}
\ No newline at end of file