PyParsing 2.3.1 Bug

pyparsing_2.3.1_bug.py

from pyparsing import (Word, Literal, Regex, Keyword, CaselessKeyword, Forward,
                       Group, OneOrMore, ZeroOrMore, alphas, nums, Suppress,
                       delimitedList, CharsNotIn, Empty, Optional, Or,
                       restOfLine)


IDENTIFIER = Word(alphas + "_", alphas + nums + "_")
(LPAREN, RPAREN, LBRACK, RBRACK, LBRACE, RBRACE,
 SEMI, COMMA, EQUAL, DQUOTE) = map(Suppress, "()[]{};,=\"")

VARIABLE = IDENTIFIER("name")
SCALARTYPE = Or(map(Keyword, "int real logical flag char string".split()))

# here's the breaking change
STRUCTMEMBERS = Forward()
STRUCTTYPE = Keyword("struct") + LBRACE + STRUCTMEMBERS("members") + RBRACE
DECLARATION = (SCALARTYPE | STRUCTTYPE)("type") + VARIABLE
STRUCTMEMBERS << Group(ZeroOrMore(Group(DECLARATION + SEMI)))


config_str = """struct {char mainversion;char subversion;} version"""

token = DECLARATION.parseString(config_str, parseAll=True)
print(token.type)


# <= 2.3.0: 'struct'
# == 2.3.1: ['struct', [['char', 'mainversion'], ['char', 'subversion']]]