def main():
banner = (
"""
PPPP Y Y BBBB AAA SSSS I CCC
P P Y Y B B A A S I C
P P Y Y B B A A S I C
PPPP Y BBBB AAAAA SSSS I C
P Y B B A A S I C
P Y B B A A S I C
P Y BBBB A A SSSS I CCC
""")
print(banner)
lexer = Lexer()
program = Program()
# Continuously accept user input and act on it until
# the user enters 'EXIT'
while True:
stmt = input('> ')
try:
tokenlist = lexer.tokenize(stmt)
# Execute commands directly, otherwise
# add program statements to the stored
# BASIC program
if len(tokenlist) > 0:
# Exit the interpreter
if tokenlist[0].category == Token.EXIT:
break
# Add a new program statement, beginning
# a line number
elif tokenlist[0].category == Token.UNSIGNEDINT\
and len(tokenlist) > 1:
program.add_stmt(tokenlist)
# Delete a statement from the program
elif tokenlist[0].category == Token.UNSIGNEDINT \
and len(tokenlist) == 1:
program.delete_statement(int(tokenlist[0].lexeme))
# Execute the program
elif tokenlist[0].category == Token.RUN:
try:
program.execute()
except KeyboardInterrupt:
print("Program terminated")
# List the program
elif tokenlist[0].category == Token.LIST:
program.list()
# Save the program to disk
elif tokenlist[0].category == Token.SAVE:
program.save(tokenlist[1].lexeme)
print("Program written to file")
# Load the program from disk
elif tokenlist[0].category == Token.LOAD:
program.load(tokenlist[1].lexeme)
print("Program read from file")
# Delete the program from memory
elif tokenlist[0].category == Token.NEW:
program.delete()
# Unrecognised input
else:
print("Unrecognised input", file=stderr)
for token in tokenlist:
token.print_lexeme()
print(flush=True)
# Trap all exceptions so that interpreter
# keeps running
except Exception as e:
print(e, file=stderr, flush=True)
def main2(p):
lexer = Lexer()
program = Program()
# Continuously accept user input and act on it until
# the user enters 'EXIT'
s2 = p.split('\n')
s2.append('RUN')
for s3 in s2:
#stmt = s3.rstrip('\r\n').rstrip('\r').rstrip('\n')
stmt = s3.rstrip('\r\n').rstrip('\r').rstrip('\n')
#print('stmt:',stmt,len(stmt))
try:
tokenlist = lexer.tokenize(stmt)
#print('tokenlist:',tokenlist)
# Execute commands directly, otherwise
# add program statements to the stored
# BASIC program
if len(tokenlist) > 0:
# Exit the interpreter
if tokenlist[0].category == Token.EXIT:
break
# Add a new program statement, beginning
# a line number
elif tokenlist[0].category == Token.UNSIGNEDINT\
and len(tokenlist) > 1:
program.add_stmt(tokenlist)
# Delete a statement from the program
elif tokenlist[0].category == Token.UNSIGNEDINT \
and len(tokenlist) == 1:
program.delete_statement(int(tokenlist[0].lexeme))
# Execute the program
elif tokenlist[0].category == Token.RUN:
try:
program.execute()
except KeyboardInterrupt:
print("Program terminated")
# List the program
elif tokenlist[0].category == Token.LIST:
program.list()
# Save the program to disk
elif tokenlist[0].category == Token.SAVE:
program.save(tokenlist[1].lexeme)
print("Program written to file")
# Load the program from disk
elif tokenlist[0].category == Token.LOAD:
program.load(tokenlist[1].lexeme)
print("Program read from file")
# Delete the program from memory
elif tokenlist[0].category == Token.NEW:
program.delete()
# Unrecognised input
else:
print("Unrecognised input", file=stderr)
for token in tokenlist:
token.print_lexeme()
print(flush=True)
# Trap all exceptions so that interpreter
# keeps running
except Exception as e:
print(e, file=stderr, flush=True)