it doesn't work ;) [class recursive function]

[Ethan Furman]

I need some fresh eyes, or better brains, or both!




--> dbf.tables.Index.from_file('', r'aad13658_last_name_for_state.idx')

starting next_item call for root
-----

-----
more nodes
CARNAHAN                       1536
ENGLUND                        1024
HOLSTEIN                       2048
MATTHEWS                       2560
ROSENFELD                      3072
TERWILLIGER                    3584
YAZZOLINO                      4096



<code snippet>

class Index(object):
    @classmethod
    def from_file(cls, table, index_file):

        def get_idx_records(data, length, howmany):
            print "get_idx_records: keylen - %d;  howmany - %d" %\
                       (length, howmany)
            ptr = 0
            current = 0
            while current < howmany:
                key = data[ptr:ptr+length].replace('\x00','')
                rec = io.unpackLongInt(data[ptr+length:ptr+length+4],\
                       bigendian=True)
                yield key, rec
                ptr += length + 4
                current += 1

        def next_item(idx_file, node_loc, keylen):
            print idx_file, node_loc, keylen, '\n','-----'
            idx_file.seek(node_loc)
            data_chunk = idx_file.read(512)
            attributes = io.unpackShortInt(data_chunk[:2])
            howmany = io.unpackShortInt(data_chunk[2:4])
            if attributes in (2, 3):
                print "actual records"
                for key, rec in get_idx_records(data_chunk[12:512],\
                        keylen, howmany):
                    yield key, rec
            else:
                print "more nodes"
                for ignore, next_node in \
                       get_idx_records(data_chunk[12:512],\
                       keylen, howmany):
                    print ignore, next_node
                    next_item(idx_file, next_node, keylen)


        idx = object.__new__(cls)
        #- idx.key = lambda rec: DoNotIndex
        data = open(index_file, 'rb')
        header = data.read(512)
        rootnode = io.unpackLongInt(header[:4])
        keylen = io.unpackShortInt(header[12:14])
        idx.__doc__ = header[16:236].replace('\x00','')
        for_expr = header[236:456].replace('\x00','')
        if for_expr:
            idx.__doc__ += ' for ' + for_expr.replace('=','==')
        print "starting next_item call for root"
        for rec in next_item(data, rootnode, keylen):
            print rec

</code snippet>

Any ideas appreciated!

~Ethan~

The expected debugging output is a list of names in alphabetical order from each node (there are about 90 of them); what I am getting is this: <open file 'aad13658_last_name_for_state.idx', mode 'rb' at 0x013BD458> 512 30 and then it stops. I should get about nine of these sections, and I'm only getting one.

aad13658_last_name_for_state.idx
Description: Binary data

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