Tokenized-Syntax-Analyzer

This project is a basic Java Syntax Analyzer designed to read Java code from an input file, detect syntax errors, and output a cleaned and analyzed version of the code along with descriptive error messages.

🔍 What Does It Do?

• Reads code from an input.txt file.
• Detects and reports:
  • Missing semicolons (;)
  • Unmatched or missing curly braces ({ or })
  • Invalid or malformed if and while conditions
  • Invalid identifiers (only lowercase single-character names like a, b, x, etc. are valid)
• Splits the input into individual statements and classifies them as:
  • Variable Declarations → e.g., int a;
  • Assignments → e.g., a = 3 + 2;
  • Return Statements → e.g., return x;
  • Conditional Statements → if, while
• Writes the output (including corrections and error messages) to output.txt.

🧪 Statement Validation Rules

Statement Type	Validation Criteria
Variable Declaration	Must follow type identifier;, e.g., int x;
Assignment	Must follow identifier = expression;, identifiers must be single lowercase letters
Return Statement	Must be return identifier; or return expression;
If / While Condition	Must have a valid comparison like a < b, and be enclosed in parentheses ( )

🚫 Error Handling

The program detects and auto-corrects common syntax issues:

• Missing Semicolons
  Adds a semicolon and logs an error message.

• Missing or Unmatched Braces
  Tracks curly braces using a stack and inserts missing braces when necessary.

• Malformed Conditions
  Flags conditions that don’t match the expected pattern (e.g., a + b < c * d).

• Invalid Identifiers
  Only allows lowercase letters like a, b, x — rejects anything else as invalid.

Each error is logged in the output.txt with a corresponding fix note.