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oasis's Issues

Add support for lists

Lists can be very useful when calculating some sequences, so it would be very useful to add support for lists (and also with 'mapping' operators when used on lists)

a(n-2) instead of a(n-1)

If an A2 operator is at the beginning, let the second argument be a(n-2) instead of a(n-1).

Currently it is useless, since + at the beginning became equivalent to x, and * to ², and - to N, and ÷ to 1.

(Then, Fibonacci would be +T.)

Default to a(0) = 0

If a recursion does not specify a(0), default it to 0.

Check for recursion by analysing the arity of each operator of the program.

Oasis call stack overflow

Believe it or not, Oasis' call stack can overflow in certain circumstances.

¹a

This pushes the first operand and then tries to do recursion with itself. Outputs:

Fatal Python error: Cannot recover from stack overflow.

Current thread 0x00007f1bda758740 (most recent call first):
  File "/usr/lib64/python3.7/ast.py", line 67 in _convert
  File "/usr/lib64/python3.7/ast.py", line 91 in literal_eval
  File "/opt/oasis/oasis.py", line 27 in pop_stack
  File "/opt/oasis/oasis.py", line 261 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  File "/opt/oasis/oasis.py", line 268 in func_a
  ...
/srv/wrappers/oasis: line 3:  1188 Aborted                 (core dumped) python3 /opt/oasis/oasis.py .code.tio "$@" < .input.tio

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