如何在Pyparsing中捕获运算符之前的所有内容

Question

我正在尝试创建pyparsing语法。我想将空格分隔的实体捕获为运算符“和” /“或”之前的单个单词。预期结果是：(United kingdom or Sweden)['United kingdom','or','Sweden']我得到的是['United', 'kingdom','or','Sweden']到目前为止的代码from pyparsing import *import jsonQUOTED = quotedString.setParseAction(removeQuotes)OAND = CaselessLiteral("and")OOR = CaselessLiteral("or")ONOT = CaselessLiteral("not")WORDWITHSPACE = Combine(OneOrMore(Word(printables.replace("(", "").replace(")", "")) | White(    ' ') + ~(White() | OAND | ONOT | OOR)))TERM = (QUOTED | WORDWITHSPACE)EXPRESSION = operatorPrecedence(TERM,                                [                                    (ONOT, 1, opAssoc.RIGHT),                                    (OAND, 2, opAssoc.LEFT),                                    (OOR, 2, opAssoc.LEFT)                                ])STRING = OneOrMore(EXPRESSION) + StringEnd()

Answer 1

我重新定义了WORDWITHSPACE，如下所示：

# space-separated words are easiest to define using just OneOrMore

# must use a negative lookahead for and/not/or operators, and this must come

# at the beginning of the expression

WORDWITHSPACE = OneOrMore(~(OAND | ONOT | OOR) + Word(printables, excludeChars="()"))

# use a parse action to recombine words into a single string

WORDWITHSPACE.addParseAction(' '.join)

通过对您的代码示例进行的这些更改，我得以编写：

tests = """

    # basic test

    United Kingdom or Sweden

    # multiple operators at the same precedence level

    United Kingdom or Sweden or France

    # implicit grouping by precedence - 'and' is higher prec than 'or

    United Kingdom or Sweden and People's Republic of China

    # use ()'s to override precedence of 'and' over 'or

    (United Kingdom or Sweden) and People's Republic of China

    """

EXPRESSION.runTests(tests, fullDump=False)

并得到

# basic test

United Kingdom or Sweden

[['United Kingdom', 'or', 'Sweden']]

# multiple operators at the same precedence level

United Kingdom or Sweden or France

[['United Kingdom', 'or', 'Sweden', 'or', 'France']]

# implicit grouping by precedence - 'and' is higher prec than 'or

United Kingdom or Sweden and People's Republic of China

[['United Kingdom', 'or', ['Sweden', 'and', "People's Republic of China"]]]

# use ()'s to override precedence of 'and' over 'or

(United Kingdom or Sweden) and People's Republic of China

[[['United Kingdom', 'or', 'Sweden'], 'and', "People's Republic of China"]]