query_parser.py 文件源码

def build_parser(self):
        parsed_term = pyparsing.Group(pyparsing.Combine(pyparsing.Word(pyparsing.alphanums) + \
                                      pyparsing.Suppress('*'))).setResultsName('wildcard') | \
                      pyparsing.Group(pyparsing.Combine(pyparsing.Word(pyparsing.alphanums+"._") + \
                                      pyparsing.Word(':') + pyparsing.Group(pyparsing.Optional("\"") + \
                                      pyparsing.Optional("<") + pyparsing.Optional(">") + pyparsing.Optional("=") + \
                                      pyparsing.Optional("-") + pyparsing.Word(pyparsing.alphanums+"._/") + \
                                      pyparsing.Optional("&") + pyparsing.Optional("<") + pyparsing.Optional(">") + \
                                      pyparsing.Optional("=") + pyparsing.Optional("-") + \
                                      pyparsing.Optional(pyparsing.Word(pyparsing.alphanums+"._/")) + \
                                      pyparsing.Optional("\"")))).setResultsName('fields') | \
                      pyparsing.Group(pyparsing.Combine(pyparsing.Suppress('-')+ \
                                      pyparsing.Word(pyparsing.alphanums+"."))).setResultsName('not_term') | \
                      pyparsing.Group(pyparsing.Word(pyparsing.alphanums)).setResultsName('term')

        parsed_or = pyparsing.Forward()
        parsed_quote_block = pyparsing.Forward()
        parsed_quote_block << ((parsed_term + parsed_quote_block) | parsed_term )
        parsed_quote = pyparsing.Group(pyparsing.Suppress('"') + parsed_quote_block + \
                       pyparsing.Suppress('"')).setResultsName("quotes") | parsed_term
        parsed_parenthesis = pyparsing.Group((pyparsing.Suppress("(") + parsed_or + \
                             pyparsing.Suppress(")"))).setResultsName("parenthesis") | parsed_quote
        parsed_and = pyparsing.Forward()
        parsed_and << (pyparsing.Group(parsed_parenthesis + pyparsing.Suppress(pyparsing.Keyword("and")) + \
                       parsed_and).setResultsName("and") | \
                       pyparsing.Group(parsed_parenthesis + pyparsing.OneOrMore(~pyparsing.oneOf("or and") + \
                       parsed_and)).setResultsName("and") | parsed_parenthesis)
        parsed_or << (pyparsing.Group(parsed_and + pyparsing.Suppress(pyparsing.Keyword("or")) + \
                      parsed_or).setResultsName("or") | parsed_and)
        return parsed_or.parseString