tools.py 文件源码

def parse_list_of_lists(xs):
    """
    Parse a list of list of integers using pyparsing
    """
    enclosed = pa.Forward()  # Parser to be defined later
    natural = pa.Word(pa.nums)  # Natural Number
    # Nested Grammar
    nestedBrackets = pa.nestedExpr(pa.Suppress('['), pa.Suppress(']'), content=enclosed)
    enclosed << (natural | pa.Suppress(',') | nestedBrackets)
    try:
        rs = enclosed.parseString(xs).asList()[0]
        return list(map(lambda x: list(map(int, x)), rs))
    except pa.ParseException:
        raise RuntimeError("Invalid Macro states Specification")