Inline-sequences, blocks and assignments

[phorward]

This issue focuses a main problem with current Tokay programs:

What if I want to parse something using Parselets / Tokens, and use the result of this parse afterwards?

This program:

print("stage 1 " + repr(x))
x = (Int _ Int expect EOF  ast("test"))
print("stage 2 " + repr(x))

executed with input 1 2 prints

stage 1 void

And that's all.

Because the inline sequence inside of the assignment is successfully parsed, and this causes the main block to stop successfully.

---

There is currently no way to get the problem implemented, except by assigning a parselet to x, but this also does not allow to run the anonymous parselet assigned to x twice:

print("stage 1 " + repr(x))
x = @{Int _ Int expect EOF  ast("test")}
print("stage 2 " + repr(x))
print("stage 3 " + repr(x))

results in

stage 1 void
stage 2 (emit => "test", children => (1, 2), offset => 0, row => 1, col => 1, stop_offset => 3, stop_row => 1, stop_col => 4)

which is the wanted behavior of the first program. stage 3 is not executed, because the block successfully stops before.

A solution has to be evaluated to fix this issue, either by different syntax or by different behavior, that is almost backward-compatible.

[phorward]

Ok closing now, as the @(...) syntax introduces a sequence separately parsed.