cmd2.py 文件源码

def _build_input_source_parser(legalChars, commentInProgress):
        """Builds a PyParsing parser for alternate user input sources (from file, pipe, etc.)"""

        input_mark = pyparsing.Literal('<')
        input_mark.setParseAction(lambda x: '')
        file_name = pyparsing.Word(legalChars + '/\\')
        input_from = file_name('inputFrom')
        input_from.setParseAction(replace_with_file_contents)
        # a not-entirely-satisfactory way of distinguishing < as in "import from" from <
        # as in "lesser than"
        inputParser = input_mark + pyparsing.Optional(input_from) + pyparsing.Optional('>') + \
            pyparsing.Optional(file_name) + (pyparsing.stringEnd | '|')
        inputParser.ignore(commentInProgress)
        return inputParser