pyparsing 不解析整个字符串

Question

我有以下语法和测试用例:

from pyparsing import Word, nums, Forward, Suppress, OneOrMore, Group

#A grammar for a simple class of regular expressions
number = Word(nums)('number')
lparen = Suppress('(')
rparen = Suppress(')')

expression = Forward()('expression')

concatenation = Group(expression + expression)
concatenation.setResultsName('concatenation')

disjunction = Group(lparen + OneOrMore(expression + Suppress('|')) + expression + rparen)
disjunction.setResultsName('disjunction')

kleene = Group(lparen + expression + rparen + '*')
kleene.setResultsName('kleene')

expression << (number | disjunction | kleene | concatenation)

#Test a simple input
tests = """
(8)*((3|2)|2)
""".splitlines()[1:]

for t in tests:
    print t
    print expression.parseString(t)
    print

结果应该是

[['8', '*'],[['3', '2'], '2']]

但相反，我只得到

[['8', '*']]

如何让 pyparsing 解析整个字符串？

Answer 1

parseString有一个参数parseAll .如果您调用parseString与 parseAll=True如果您的语法没有解析整个字符串，您将收到错误消息。从那里去!