compilation_course_compiler/cpq.py

import sly
import sys
# for ease of reading, the compiler is broken down to multiple files
# parser.py for the parser
# lexer.py for the lexer
# and helper.py for helper functions(such as print_err)
from lexer import Lexer
from parser import Parser
from helper import print_err

# print signature
print_err('Aviv Romem')

# invalid usage
if len(sys.argv) != 2 or not sys.argv[1].endswith('.ou'):
    print('USAGE: python cpq.py <file-name>.ou')
    exit(1)

# load file and parser
file = sys.argv[1]
output = file[:-3] + '.qud'
f = open(file, 'r')
text = f.read()
f.close()
lexer = Lexer()
parser = Parser()

file = sys.argv[1]
# parse and write file if valid
parser.parse(lexer.tokenize(text))
if not parser.had_errors:
    f = open(output, 'w')
    f.writelines([l + '\n' for l in parser.lines])
    f.close()