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py, compiler: Allow lambda's to yield.

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This commit is contained in:
Damien George 2014-04-11 13:10:21 +00:00
parent 0288cf020e
commit 0e3329a6b8
2 changed files with 11 additions and 7 deletions
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15
py/compile.c
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@ -2681,7 +2681,7 @@ void compile_argument(compiler_t *comp, mp_parse_node_struct_t *pns) {
}
void compile_yield_expr(compiler_t *comp, mp_parse_node_struct_t *pns) {
if (comp->scope_cur->kind != SCOPE_FUNCTION) {
if (comp->scope_cur->kind != SCOPE_FUNCTION && comp->scope_cur->kind != SCOPE_LAMBDA) {
compile_syntax_error(comp, (mp_parse_node_t)pns, "'yield' outside function");
return;
}
@ -2993,6 +2993,12 @@ void compile_scope(compiler_t *comp, scope_t *scope, pass_kind_t pass) {
}
compile_node(comp, pns->nodes[1]); // 1 is lambda body
// if the lambda is a generator, then we return None, not the result of the expression of the lambda
if (scope->scope_flags & MP_SCOPE_FLAG_GENERATOR) {
EMIT(pop_top);
EMIT_ARG(load_const_tok, MP_TOKEN_KW_NONE);
}
EMIT(return_value);
} else if (scope->kind == SCOPE_LIST_COMP || scope->kind == SCOPE_DICT_COMP || scope->kind == SCOPE_SET_COMP || scope->kind == SCOPE_GEN_EXPR) {
// a bit of a hack at the moment
@ -3242,15 +3248,10 @@ void compile_scope_compute_things(compiler_t *comp, scope_t *scope) {
#if MICROPY_EMIT_CPYTHON
// these flags computed here are for CPython compatibility only
if (scope->kind == SCOPE_FUNCTION) {
scope->scope_flags |= MP_SCOPE_FLAG_NEWLOCALS;
}
if (scope->kind == SCOPE_FUNCTION || scope->kind == SCOPE_LAMBDA || scope->kind == SCOPE_LIST_COMP || scope->kind == SCOPE_DICT_COMP || scope->kind == SCOPE_SET_COMP || scope->kind == SCOPE_GEN_EXPR) {
assert(scope->parent != NULL);
scope->scope_flags |= MP_SCOPE_FLAG_NEWLOCALS;
scope->scope_flags |= MP_SCOPE_FLAG_OPTIMISED;
// TODO possibly other ways it can be nested
// Note that we don't actually use this information at the moment (for CPython compat only)
if ((SCOPE_FUNCTION <= scope->parent->kind && scope->parent->kind <= SCOPE_SET_COMP) || (scope->parent->kind == SCOPE_CLASS && scope->parent->parent->kind == SCOPE_FUNCTION)) {
scope->scope_flags |= MP_SCOPE_FLAG_NESTED;
}

3
tests/bytecode/mp-tests/yield2.py
View File

@ -2,3 +2,6 @@ def f():
yield from a
yield from (a, b)
yield from f(a)
lambda:(yield)
lambda:(yield 1) + 2