can't iterate a dynlexpad

[coke]

See the  Original RT

Attempting to iterator over a dynlexpad generates the following error:

get_iter() not implemented in class 'DynLexPad'

There's a todo test in t/dynpmc/dynlexpad.t

This is a tcl blocker for converting over to using parrot's callchain (as we'd need to use dynlexpads, and we'd need to be able to iterate over the list of available variables.)

[pmichaud]

nqp-rx has a clever(?) trick it uses to get iterable dynlexpads -- it simply uses the 'copy' opcode to replace an existing LexPad with a Hash, which can then be used as a dynamic lexpad.

The relevant code is in src/cheats/hll-compiler.pir, starting around line 180:

    .local pmc ctx, pad
    $P0 = getinterp
    ctx = $P0['context']
    pad = getattribute ctx, 'lex_pad'
    $P1 = new ['Hash']
    copy pad, $P1

The above replaces a context's existing LexPad PMC with a Hash PMC, which is both dynamic and iterable.

Pm

[whiteknight]

I created the dynlexpad_get_iter branch. In aecd881 I committed some prototype code that (I think) should allow dynlexpads to be iterable. If somebody can help write a test or two for the new behavior, I think it can be tested and merged.

[whiteknight]

I've assigned the last stage of this ticket as a GCI task.

[whiteknight]

this branch has been merged and the tests for it have been unskipped. I'm closing this ticket.