# check if terminal symbol matched
if grammar.is_terminal(top) and grammar.match(top, tokens[pointer][0]):
if top == tokens[pointer][0] == 'GOTO': stack.pop()
if top == 'line_num' and tokens[pointer][0] == 'GOTO': top = 'GOTO'
b_code = grammar.get_b_code(top, tokens[pointer][1])
output += b_code
# Save current line for error message
if b_code[0] == 10: current_line = b_code[1]
pointer += 1
else:
# Check if it is in correct grammar
# If yes, push next production(s) to stack
prod_number = grammar.check_grammar(top, tokens[pointer][0])
if prod_number != 0:
prod = grammar.get_next_production(prod_number)
for i in range(len(prod) - 1, -1, -1):
stack.push(prod[i])
else:
error_message = grammar.get_error_message(top, current_line)
error = True
break
output_file = open('./output.txt', 'w')
if not error:
for i in output:
output_file.write(str(i))
output_file.write(' ')
else:
output_file.write(error_message)
output_file.close()
