Lexer Error Handling

Your Task

Extend your lexer with comprehensive error handling and reporting.

Requirements

1. Create an error reporting system:

   • LexerError struct with message, line, column
   • Array to collect multiple errors
   • Continue lexing after errors (don't stop at first error)

2. Handle these error cases:

   • Invalid characters: Report and skip unknown characters
   • Unterminated strings: Detect EOF inside string literal
   • Unterminated block comments: Detect EOF inside /* */
   • Invalid number formats: Detect 123abc patterns

3. Implement error tokens:

   • Return TOKEN_ERROR with descriptive message
   • Include the problematic text in the lexeme

4. Add functions:

   • lexer_get_errors(): Return array of collected errors
   • lexer_has_errors(): Check if any errors occurred
   • lexer_error_count(): Return number of errors

Success Criteria

• Invalid input produces helpful error messages
• Lexer continues after errors to find multiple issues
• Error locations are accurate