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py/runtime: Implement dispatch for "reverse op" special methods.

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If, for class X, X.__add__(Y) doesn't exist (or returns NotImplemented),
try Y.__radd__(X) instead.

This patch could be simpler, but requires undoing operand swap and
operation switch to get non-confusing error message in case __radd__
doesn't exist.
This commit is contained in:
Paul Sokolovsky
2017-09-10 17:05:20 +03:00
parent de981040b3
commit eb84a830df
5 changed files with 48 additions and 2 deletions
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17
py/runtime0.h
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@@ -101,6 +101,23 @@ typedef enum {
// Operations below this line don't appear in bytecode, they
// just identify special methods.
// MP_BINARY_OP_REVERSE_* must follow immediately after MP_BINARY_OP_*
#if MICROPY_PY_REVERSE_SPECIAL_METHODS
MP_BINARY_OP_REVERSE_OR,
MP_BINARY_OP_REVERSE_XOR,
MP_BINARY_OP_REVERSE_AND,
MP_BINARY_OP_REVERSE_LSHIFT,
MP_BINARY_OP_REVERSE_RSHIFT,
MP_BINARY_OP_REVERSE_ADD,
MP_BINARY_OP_REVERSE_SUBTRACT,
MP_BINARY_OP_REVERSE_MULTIPLY,
MP_BINARY_OP_REVERSE_FLOOR_DIVIDE,
MP_BINARY_OP_REVERSE_TRUE_DIVIDE,
MP_BINARY_OP_REVERSE_MODULO,
MP_BINARY_OP_REVERSE_POWER,
#endif
MP_BINARY_OP_DIVMOD, // not emitted by the compiler but supported by the runtime
MP_BINARY_OP_LAST,