main.py

import argparse
import sys

from pascal_interpreter import (
    Lexer, Parser, SemanticAnalyzer, Interpreter,
    LexerError, ParserError, SemanticError
)
from pascal_interpreter.semantic_analyzer import set_scope_logging
from pascal_interpreter.interpreter import set_stack_logging


def main():
    arg_parser = argparse.ArgumentParser(
        description='Pascal Interpreter'
    )
    arg_parser.add_argument('inputfile', help='Pascal source file')
    arg_parser.add_argument(
        '--scope',
        help='Print scope information',
        action='store_true',
    )
    arg_parser.add_argument(
        '--stack',
        help='Print call stack',
        action='store_true',
    )
    args = arg_parser.parse_args()

    set_scope_logging(args.scope)
    set_stack_logging(args.stack)

    try:
        with open(args.inputfile, 'r') as f:
            text = f.read()
    except FileNotFoundError:
        print(f"Error: File '{args.inputfile}' not found")
        sys.exit(1)

    lexer = Lexer(text)
    try:
        parser = Parser(lexer)
        tree = parser.parse()
    except (LexerError, ParserError) as e:
        print(e.message)
        sys.exit(1)

    semantic_analyzer = SemanticAnalyzer()
    try:
        semantic_analyzer.visit(tree)
    except SemanticError as e:
        print(e.message)
        sys.exit(1)

    interpreter = Interpreter(tree)
    interpreter.interpret()


if __name__ == '__main__':
    main()