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py: Implement compiling of *-expr within parenthesis.

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This commit is contained in:
Damien George 2014-04-11 11:53:00 +00:00
parent a5c82a8187
commit 0288cf020e
2 changed files with 46 additions and 26 deletions
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57
py/compile.c
View File

@ -666,28 +666,42 @@ cannot_assign:
compile_syntax_error(comp, (mp_parse_node_t)pns, "can't assign to expression");
}
void c_assign_tuple(compiler_t *comp, int n, mp_parse_node_t *nodes) {
assert(n >= 0);
// we need to allow for a caller passing in 1 initial node (node_head) followed by an array of nodes (nodes_tail)
void c_assign_tuple(compiler_t *comp, mp_parse_node_t node_head, uint num_tail, mp_parse_node_t *nodes_tail) {
uint num_head = (node_head == MP_PARSE_NODE_NULL) ? 0 : 1;
// look for star expression
int have_star_index = -1;
for (int i = 0; i < n; i++) {
if (MP_PARSE_NODE_IS_STRUCT_KIND(nodes[i], PN_star_expr)) {
if (num_head != 0 && MP_PARSE_NODE_IS_STRUCT_KIND(node_head, PN_star_expr)) {
EMIT_ARG(unpack_ex, 0, num_tail);
have_star_index = 0;
}
for (int i = 0; i < num_tail; i++) {
if (MP_PARSE_NODE_IS_STRUCT_KIND(nodes_tail[i], PN_star_expr)) {
if (have_star_index < 0) {
EMIT_ARG(unpack_ex, i, n - i - 1);
have_star_index = i;
EMIT_ARG(unpack_ex, num_head + i, num_tail - i - 1);
have_star_index = num_head + i;
} else {
compile_syntax_error(comp, nodes[i], "two starred expressions in assignment");
compile_syntax_error(comp, nodes_tail[i], "two starred expressions in assignment");
return;
}
}
}
if (have_star_index < 0) {
EMIT_ARG(unpack_sequence, n);
EMIT_ARG(unpack_sequence, num_head + num_tail);
}
for (int i = 0; i < n; i++) {
if (i == have_star_index) {
c_assign(comp, ((mp_parse_node_struct_t*)nodes[i])->nodes[0], ASSIGN_STORE);
if (num_head != 0) {
if (0 == have_star_index) {
c_assign(comp, ((mp_parse_node_struct_t*)node_head)->nodes[0], ASSIGN_STORE);
} else {
c_assign(comp, nodes[i], ASSIGN_STORE);
c_assign(comp, node_head, ASSIGN_STORE);
}
}
for (int i = 0; i < num_tail; i++) {
if (num_head + i == have_star_index) {
c_assign(comp, ((mp_parse_node_struct_t*)nodes_tail[i])->nodes[0], ASSIGN_STORE);
} else {
c_assign(comp, nodes_tail[i], ASSIGN_STORE);
}
}
}
@ -727,7 +741,7 @@ void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t assign_kind) {
if (assign_kind != ASSIGN_STORE) {
goto bad_aug;
}
c_assign_tuple(comp, MP_PARSE_NODE_STRUCT_NUM_NODES(pns), pns->nodes);
c_assign_tuple(comp, MP_PARSE_NODE_NULL, MP_PARSE_NODE_STRUCT_NUM_NODES(pns), pns->nodes);
break;
case PN_atom_paren:
@ -753,13 +767,13 @@ void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t assign_kind) {
}
if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
// empty list, assignment allowed
c_assign_tuple(comp, 0, NULL);
c_assign_tuple(comp, MP_PARSE_NODE_NULL, 0, NULL);
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp)) {
pns = (mp_parse_node_struct_t*)pns->nodes[0];
goto testlist_comp;
} else {
// brackets around 1 item
c_assign_tuple(comp, 1, &pns->nodes[0]);
c_assign_tuple(comp, pns->nodes[0], 0, NULL);
}
break;
@ -776,16 +790,11 @@ void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t assign_kind) {
if (MP_PARSE_NODE_STRUCT_KIND(pns2) == PN_testlist_comp_3b) {
// sequence of one item, with trailing comma
assert(MP_PARSE_NODE_IS_NULL(pns2->nodes[0]));
c_assign_tuple(comp, 1, &pns->nodes[0]);
c_assign_tuple(comp, pns->nodes[0], 0, NULL);
} else if (MP_PARSE_NODE_STRUCT_KIND(pns2) == PN_testlist_comp_3c) {
// sequence of many items
// TODO call c_assign_tuple instead
int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns2);
EMIT_ARG(unpack_sequence, 1 + n);
c_assign(comp, pns->nodes[0], ASSIGN_STORE);
for (int i = 0; i < n; i++) {
c_assign(comp, pns2->nodes[i], ASSIGN_STORE);
}
uint n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns2);
c_assign_tuple(comp, pns->nodes[0], n, pns2->nodes);
} else if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_comp_for) {
// TODO can we ever get here? can it be compiled?
compile_syntax_error(comp, (mp_parse_node_t)pns, "can't assign to expression");
@ -797,7 +806,7 @@ void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t assign_kind) {
} else {
// sequence with 2 items
sequence_with_2_items:
c_assign_tuple(comp, 2, pns->nodes);
c_assign_tuple(comp, MP_PARSE_NODE_NULL, 2, pns->nodes);
}
return;
}

15
tests/bytecode/mp-tests/assign2.py
View File

@ -6,5 +6,16 @@ a, *b, c = d
[*a] = b
[*a,] = b
[a, *b] = c
#[a, *b,] = c
#[a, *b, c] = d
[a, *b,] = c
[a, *b, c] = d
(*a,) = x
(*a, b) = x
(a, *b) = x
(*a, b, c) = x
(a, *b, c) = x
(a, b, *c) = x
(*a, b, c, d) = x
(a, *b, c, d) = x
(a, b, *c, d) = x
(a, b, c, *d) = x