def __parse_tokens__(self, s):
tokens = []
token = ""
single_tokens = (
'(',
')',
'[',
']',
'+',
'-',
'*',
'/',
'^',
)
for ch in s:
if ch in single_tokens or ch == ' ':
if token:
tokens.append(Token(token))
if ch != ' ':
token = Token(ch)
if token.val in ('+', '-'):
if not tokens or tokens[-1].typ not in (
TokenType.NUMBER, TokenType.X):
token.typ = TokenType.FUNCTION
tokens.append(token)
token = ''
else:
if ch:
token += ch
if token:
token = Token(token)
if token.val in ('+', '-'):
if not tokens or tokens[-1].typ not in (TokenType.NUMBER,
TokenType.X):
token.typ = TokenType.FUNCTION
tokens.append(token)
return tokens
