def interpret(self):
'''interpret a line (first call Parser.getline())
Returns 0 on success, 1 on error
'''
if not self.keyword:
stderr('%s: no keyword set; invalid parser state' % self)
self.errors += 1
return 1
if not self.ifdef_stack[0]:
if not self.keyword in ('ifdef', 'ifndef', 'else', 'endif'):
debug("%s: skipping %s" % (self, self.keyword))
return 0
# get the parser function
try:
func = getattr(self, 'parse_%s' % self.keyword)
except AttributeError:
stderr("%s: unknown keyword '%s'" % (self, self.keyword))
self.errors += 1
return 1
try:
func()
except ParseError as parse_error:
parse_error.perror()
self.errors += 1
return 1
return 0
def read_input_file(filename):
'''read a (included) input file
Returns 0 on success, or error count on errors
'''
errors = 0
parser = Parser()
try:
parser.open(filename)
except IOError as err:
stderr('failed to open %s: %s' % (filename, err.strerror))
return 1
while parser.getline():
parser.insert_comment_line()
parser.interpret()
if len(parser.ifdef_stack) > 1:
ParseError("%s: missing 'endif' statement" % parser).perror()
errors += 1
parser.close()
errors = errors + parser.errors
debug('errors == %d' % errors)
return errors
def perror(self):
'''print error message'''
stderr(self.msg)