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support yield implicit None

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This commit is contained in:
blueloveTH 2024-09-29 17:24:33 +08:00
parent 0a77c96c0a
commit 18fc4c02d3
3 changed files with 16 additions and 6 deletions
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4
src/compiler/compiler.c
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@ -2498,10 +2498,14 @@ static Error* compile_stmt(Compiler* self) {
break; break;
case TK_YIELD: case TK_YIELD:
if(self->contexts.length <= 1) return SyntaxError(self, "'yield' outside function"); if(self->contexts.length <= 1) return SyntaxError(self, "'yield' outside function");
if(match_end_stmt(self)) {
Ctx__emit_(ctx(), OP_YIELD_VALUE, 1, kw_line);
} else {
check(EXPR_TUPLE(self)); check(EXPR_TUPLE(self));
Ctx__s_emit_top(ctx()); Ctx__s_emit_top(ctx());
Ctx__emit_(ctx(), OP_YIELD_VALUE, BC_NOARG, kw_line); Ctx__emit_(ctx(), OP_YIELD_VALUE, BC_NOARG, kw_line);
consume_end_stmt(); consume_end_stmt();
}
break; break;
case TK_YIELD_FROM: case TK_YIELD_FROM:
check(compile_yield_from(self, kw_line)); check(compile_yield_from(self, kw_line));

4
src/interpreter/ceval.c
View File

@ -715,8 +715,12 @@ FrameResult VM__run_top_frame(VM* self) {
DISPATCH(); DISPATCH();
} }
case OP_YIELD_VALUE: { case OP_YIELD_VALUE: {
if(byte.arg == 1) {
py_newnone(py_retval());
} else {
py_assign(py_retval(), TOP()); py_assign(py_retval(), TOP());
POP(); POP();
}
return RES_YIELD; return RES_YIELD;
} }
///////// /////////

2
tests/51_yield.py
View File

@ -1,10 +1,12 @@
def g(): def g():
yield 1 yield 1
yield 2 yield 2
yield
a = g() a = g()
assert next(a) == 1 assert next(a) == 1
assert next(a, None) == 2 assert next(a, None) == 2
assert next(a) == None
try: try:
next(a) next(a)