main.py

#!/home/loya/py-language/venv/bin/python
from src.exceptions import *
from src.parser_ import Parser
from src.interpreter import *
from src.environment import Environment
import readline
import sys
import os


def repl():
    if not os.path.exists(".input_history"):
        with open(".input_history", "w", encoding="utf-8") as f:
            ...
    readline.read_history_file(".input_history")

    parser = Parser()
    print("\nRepl v0.1")
    while True:
        try:
            code = input(">>>")
        except (EOFError, KeyboardInterrupt):
            print("\n\nexiting......\n")
            break

        code = code.strip()
        if not code:
            continue
        if code == "exit":
            print("\nexiting......\n")
            break

        try:
            program = parser.produce_ast(code)
            # program.print()
            rst = evaluate(program, env)
            if not isinstance(rst, NullVal):
                print(rst)
        except PyException as e:
            e.print()

    readline.append_history_file(999, ".input_history")


if __name__ == "__main__":
    env = Environment()
    d = Environment(env)
    if len(sys.argv) > 1:
        f = open(sys.argv[1])
        codes = f.read()
        f.close()

        try:
            parser = Parser()
            program = parser.produce_ast(codes)
            # program.print()

            rst = evaluate(program, env)
            # print(rst)
        except PyException as e:
            e.print()
    else:
        repl()