class Source:    def __init__(self, s):        self.fn = s    def marshal(self):        return "source %s" % (self.fn)class Block:    def __init__(self, typename, d, name = ""):        self.name = name        self.typestr = typename        self.names = d    def marshal(self):        r = ""        r += " %s %s " % (self.typestr, self.name)        r += "{\n"        keys =  self.names.keys()        ii = 0        for k in keys:            r += "%s = %s" % (k, marshal(self.names[k]))            if ii < (len(keys) - 1):                r += ',\n'            ii += 1                r += "\n}"        return r    def __init__(self, f):    self.f = fclass List:    def __init__(self,l,  n = 0):        self.n = n   # how often to print a newline -- pp hint        self.l = l        def marshal(self):        r = ""        r += "[\n"        ii = 0                for i in self.l:            r += marshal(i)            if ii < (len(self.l) - 1):                r += ', '            if self.n and (not self.n \                           or (ii and (ii % self.n == self.n - 1))):                r += '\n'            ii += 1                r += " ]"        return rdef marshal(x):    r = ""    if type(x) == int:        r += ("%d" % x)    elif type(x) == float:        if x == 0.0:            r += "0.0"        else:            r += ("%f" % x)    elif type(x) == str:        r += x    else:        r += x.marshal()    return r