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parsing expression is done! :D

This commit is contained in:
lafrite 2014-01-15 16:32:12 +01:00
parent 6e541144bb
commit b52ec78d21
1 changed files with 17 additions and 9 deletions
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26
expression.py
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@ -113,19 +113,27 @@ class Expression(object):
def str2tokens(self, exp): def str2tokens(self, exp):
""" Parse the expression, ie tranform a string into a list of tokens """ Parse the expression, ie tranform a string into a list of tokens
/!\ float are not availiable yet!
:param exp: The expression (a string) :param exp: The expression (a string)
:returns: list of token :returns: list of token
""" """
tokens = exp.split(" ") tokens = ['']
for (i,t) in enumerate(tokens): for character in exp:
try: if character.isdigit():
tokens[i] = int(t) if type(tokens[-1]) == int:
except ValueError: tokens[-1] = tokens[-1]*10 + int(character)
pass else:
tokens.append(int(character))
elif character in "+-*/()":
tokens.append(character)
elif character != " ":
raise ValueError("{} is an unvalid character".format(character))
return tokens print(tokens[1:])
return tokens[1:]
# --------------------- # ---------------------
# "fix" recognition # "fix" recognition
@ -332,10 +340,10 @@ if __name__ == '__main__':
exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 12" exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 12"
test(exp) test(exp)
exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 2" exp = "( 2+ 5 )/( 3 * 4 ) + 1 / 2"
test(exp) test(exp)
exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 12 + 5 * 5" exp="(2+5)/(3*4)+1/12+5*5"
test(exp) test(exp)
import doctest import doctest