mini_compiler/
├── main.py              # Entry point: links all phases together
├── lexer.py             # Phase 1: Tokenizer
├── parser_ast.py        # Phase 2: Recursive Descent Parser & AST Nodes
├── semantic_analyzer.py # Phase 3: Symbol Table & Type Checking
├── icg.py               # Phase 4: Three-Address Code Generator
├── optimizer.py         # Bonus: Constant Folding
├── code_gen.py          # Bonus: Assembly-like Generator
└── tests/
    └── sample_code.txt  # Input file with custom language code