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https://github.com/python/cpython.git
synced 2025-08-23 02:04:56 +00:00
Hide list comp variables and support set comprehensions
This commit is contained in:
Nick Coghlan
parent
6ef6306dd6
commit
650f0d06d3
29 changed files with 2006 additions and 1323 deletions
366
Python/ast.c
366
Python/ast.c
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@ -27,7 +27,6 @@ static stmt_ty ast_for_stmt(struct compiling *, const node *);
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static asdl_seq *ast_for_suite(struct compiling *, const node *);
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static asdl_seq *ast_for_exprlist(struct compiling *, const node *, expr_context_ty);
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static expr_ty ast_for_testlist(struct compiling *, const node *);
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static expr_ty ast_for_testlist_gexp(struct compiling *, const node *);
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/* Note different signature for ast_for_call */
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static expr_ty ast_for_call(struct compiling *, const node *, expr_ty);
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@ -41,6 +40,10 @@ static PyObject *parsestrplus(struct compiling *, const node *n,
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#define LINENO(n) ((n)->n_lineno)
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#endif
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#define COMP_GENEXP 0
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#define COMP_LISTCOMP 1
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#define COMP_SETCOMP 2
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static identifier
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new_identifier(const char* n, PyArena *arena) {
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PyObject* id = PyString_InternFromString(n);
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@ -231,7 +234,7 @@ PyAST_FromNode(const node *n, PyCompilerFlags *flags, const char *filename,
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case eval_input: {
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expr_ty testlist_ast;
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/* XXX Why not gen_for here? */
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/* XXX Why not comp_for here? */
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testlist_ast = ast_for_testlist(&c, CHILD(n, 0));
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if (!testlist_ast)
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goto error;
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@ -530,19 +533,14 @@ seq_for_testlist(struct compiling *c, const node *n)
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asdl_seq *seq;
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expr_ty expression;
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int i;
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assert(TYPE(n) == testlist
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|| TYPE(n) == listmaker
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|| TYPE(n) == testlist_gexp
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|| TYPE(n) == testlist_safe
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|| TYPE(n) == testlist1
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);
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assert(TYPE(n) == testlist || TYPE(n) == testlist_comp);
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seq = asdl_seq_new((NCH(n) + 1) / 2, c->c_arena);
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if (!seq)
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return NULL;
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for (i = 0; i < NCH(n); i += 2) {
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assert(TYPE(CHILD(n, i)) == test || TYPE(CHILD(n, i)) == old_test);
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assert(TYPE(CHILD(n, i)) == test || TYPE(CHILD(n, i)) == test_nocond);
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expression = ast_for_expr(c, CHILD(n, i));
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if (!expression)
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@ -1022,7 +1020,8 @@ ast_for_funcdef(struct compiling *c, const node *n)
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static expr_ty
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ast_for_lambdef(struct compiling *c, const node *n)
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{
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/* lambdef: 'lambda' [varargslist] ':' test */
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/* lambdef: 'lambda' [varargslist] ':' test
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lambdef_nocond: 'lambda' [varargslist] ':' test_nocond */
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arguments_ty args;
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expr_ty expression;
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@ -1067,190 +1066,34 @@ ast_for_ifexpr(struct compiling *c, const node *n)
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c->c_arena);
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}
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/* XXX(nnorwitz): the listcomp and genexpr code should be refactored
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so there is only a single version. Possibly for loops can also re-use
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the code.
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*/
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/* Count the number of 'for' loop in a list comprehension.
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Helper for ast_for_listcomp().
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*/
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static int
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count_list_fors(const node *n)
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{
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int n_fors = 0;
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node *ch = CHILD(n, 1);
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count_list_for:
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n_fors++;
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REQ(ch, list_for);
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if (NCH(ch) == 5)
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ch = CHILD(ch, 4);
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else
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return n_fors;
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count_list_iter:
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REQ(ch, list_iter);
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ch = CHILD(ch, 0);
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if (TYPE(ch) == list_for)
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goto count_list_for;
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else if (TYPE(ch) == list_if) {
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if (NCH(ch) == 3) {
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ch = CHILD(ch, 2);
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goto count_list_iter;
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}
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else
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return n_fors;
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}
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/* Should never be reached */
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PyErr_SetString(PyExc_SystemError, "logic error in count_list_fors");
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return -1;
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}
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/* Count the number of 'if' statements in a list comprehension.
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Helper for ast_for_listcomp().
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*/
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static int
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count_list_ifs(const node *n)
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{
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int n_ifs = 0;
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count_list_iter:
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REQ(n, list_iter);
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if (TYPE(CHILD(n, 0)) == list_for)
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return n_ifs;
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n = CHILD(n, 0);
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REQ(n, list_if);
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n_ifs++;
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if (NCH(n) == 2)
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return n_ifs;
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n = CHILD(n, 2);
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goto count_list_iter;
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}
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static expr_ty
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ast_for_listcomp(struct compiling *c, const node *n)
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{
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/* listmaker: test ( list_for | (',' test)* [','] )
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list_for: 'for' exprlist 'in' testlist_safe [list_iter]
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list_iter: list_for | list_if
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list_if: 'if' test [list_iter]
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testlist_safe: test [(',' test)+ [',']]
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*/
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expr_ty elt;
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asdl_seq *listcomps;
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int i, n_fors;
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node *ch;
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REQ(n, listmaker);
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assert(NCH(n) > 1);
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elt = ast_for_expr(c, CHILD(n, 0));
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if (!elt)
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return NULL;
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n_fors = count_list_fors(n);
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if (n_fors == -1)
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return NULL;
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listcomps = asdl_seq_new(n_fors, c->c_arena);
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if (!listcomps)
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return NULL;
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ch = CHILD(n, 1);
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for (i = 0; i < n_fors; i++) {
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comprehension_ty lc;
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asdl_seq *t;
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expr_ty expression;
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node *for_ch;
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REQ(ch, list_for);
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for_ch = CHILD(ch, 1);
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t = ast_for_exprlist(c, for_ch, Store);
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if (!t)
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return NULL;
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expression = ast_for_testlist(c, CHILD(ch, 3));
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if (!expression)
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return NULL;
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/* Check the # of children rather than the length of t, since
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[x for x, in ... ] has 1 element in t, but still requires a Tuple. */
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if (NCH(for_ch) == 1)
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lc = comprehension((expr_ty)asdl_seq_GET(t, 0), expression, NULL,
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c->c_arena);
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else
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lc = comprehension(Tuple(t, Store, LINENO(ch), ch->n_col_offset,
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c->c_arena),
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expression, NULL, c->c_arena);
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if (!lc)
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return NULL;
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if (NCH(ch) == 5) {
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int j, n_ifs;
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asdl_seq *ifs;
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ch = CHILD(ch, 4);
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n_ifs = count_list_ifs(ch);
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if (n_ifs == -1)
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return NULL;
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ifs = asdl_seq_new(n_ifs, c->c_arena);
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if (!ifs)
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return NULL;
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for (j = 0; j < n_ifs; j++) {
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REQ(ch, list_iter);
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ch = CHILD(ch, 0);
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REQ(ch, list_if);
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asdl_seq_SET(ifs, j, ast_for_expr(c, CHILD(ch, 1)));
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if (NCH(ch) == 3)
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ch = CHILD(ch, 2);
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}
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/* on exit, must guarantee that ch is a list_for */
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if (TYPE(ch) == list_iter)
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ch = CHILD(ch, 0);
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lc->ifs = ifs;
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}
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asdl_seq_SET(listcomps, i, lc);
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}
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return ListComp(elt, listcomps, LINENO(n), n->n_col_offset, c->c_arena);
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}
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/*
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Count the number of 'for' loops in a generator expression.
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Count the number of 'for' loops in a comprehension.
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Helper for ast_for_genexp().
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Helper for ast_for_comprehension().
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*/
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static int
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count_gen_fors(const node *n)
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count_comp_fors(const node *n)
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{
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int n_fors = 0;
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node *ch = CHILD(n, 1);
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count_gen_for:
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count_comp_for:
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n_fors++;
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REQ(ch, gen_for);
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REQ(ch, comp_for);
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if (NCH(ch) == 5)
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ch = CHILD(ch, 4);
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else
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return n_fors;
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count_gen_iter:
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REQ(ch, gen_iter);
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count_comp_iter:
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REQ(ch, comp_iter);
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ch = CHILD(ch, 0);
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if (TYPE(ch) == gen_for)
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goto count_gen_for;
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else if (TYPE(ch) == gen_if) {
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if (TYPE(ch) == comp_for)
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goto count_comp_for;
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else if (TYPE(ch) == comp_if) {
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if (NCH(ch) == 3) {
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ch = CHILD(ch, 2);
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goto count_gen_iter;
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goto count_comp_iter;
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}
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else
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return n_fors;
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@ -1258,26 +1101,26 @@ count_gen_fors(const node *n)
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/* Should never be reached */
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PyErr_SetString(PyExc_SystemError,
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"logic error in count_gen_fors");
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"logic error in count_comp_fors");
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return -1;
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}
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/* Count the number of 'if' statements in a generator expression.
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/* Count the number of 'if' statements in a comprehension.
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Helper for ast_for_genexp().
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Helper for ast_for_comprehension().
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*/
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static int
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count_gen_ifs(const node *n)
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count_comp_ifs(const node *n)
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{
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int n_ifs = 0;
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while (1) {
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REQ(n, gen_iter);
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if (TYPE(CHILD(n, 0)) == gen_for)
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REQ(n, comp_iter);
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if (TYPE(CHILD(n, 0)) == comp_for)
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return n_ifs;
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n = CHILD(n, 0);
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REQ(n, gen_if);
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REQ(n, comp_if);
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n_ifs++;
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if (NCH(n) == 2)
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return n_ifs;
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@ -1285,40 +1128,38 @@ count_gen_ifs(const node *n)
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}
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}
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/* TODO(jhylton): Combine with list comprehension code? */
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static expr_ty
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ast_for_genexp(struct compiling *c, const node *n)
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ast_for_comprehension(struct compiling *c, const node *n, int type)
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{
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/* testlist_gexp: test ( gen_for | (',' test)* [','] )
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argument: [test '='] test [gen_for] # Really [keyword '='] test */
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/* testlist_comp: test ( comp_for | (',' test)* [','] )
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argument: [test '='] test [comp_for] # Really [keyword '='] test */
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expr_ty elt;
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asdl_seq *genexps;
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asdl_seq *comps;
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int i, n_fors;
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node *ch;
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assert(TYPE(n) == (testlist_gexp) || TYPE(n) == (argument));
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assert(NCH(n) > 1);
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elt = ast_for_expr(c, CHILD(n, 0));
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if (!elt)
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return NULL;
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n_fors = count_gen_fors(n);
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n_fors = count_comp_fors(n);
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if (n_fors == -1)
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return NULL;
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genexps = asdl_seq_new(n_fors, c->c_arena);
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if (!genexps)
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comps = asdl_seq_new(n_fors, c->c_arena);
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if (!comps)
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return NULL;
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ch = CHILD(n, 1);
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for (i = 0; i < n_fors; i++) {
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comprehension_ty ge;
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comprehension_ty comp;
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asdl_seq *t;
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expr_ty expression;
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node *for_ch;
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REQ(ch, gen_for);
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REQ(ch, comp_for);
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for_ch = CHILD(ch, 1);
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t = ast_for_exprlist(c, for_ch, Store);
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@ -1331,14 +1172,14 @@ ast_for_genexp(struct compiling *c, const node *n)
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/* Check the # of children rather than the length of t, since
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(x for x, in ...) has 1 element in t, but still requires a Tuple. */
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if (NCH(for_ch) == 1)
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ge = comprehension((expr_ty)asdl_seq_GET(t, 0), expression,
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NULL, c->c_arena);
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comp = comprehension((expr_ty)asdl_seq_GET(t, 0), expression,
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NULL, c->c_arena);
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else
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ge = comprehension(Tuple(t, Store, LINENO(ch), ch->n_col_offset,
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c->c_arena),
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expression, NULL, c->c_arena);
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comp = comprehension(Tuple(t, Store, LINENO(ch), ch->n_col_offset,
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c->c_arena),
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expression, NULL, c->c_arena);
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if (!ge)
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if (!comp)
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return NULL;
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if (NCH(ch) == 5) {
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@ -1346,7 +1187,7 @@ ast_for_genexp(struct compiling *c, const node *n)
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asdl_seq *ifs;
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ch = CHILD(ch, 4);
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n_ifs = count_gen_ifs(ch);
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n_ifs = count_comp_ifs(ch);
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if (n_ifs == -1)
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return NULL;
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@ -1355,9 +1196,9 @@ ast_for_genexp(struct compiling *c, const node *n)
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return NULL;
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for (j = 0; j < n_ifs; j++) {
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REQ(ch, gen_iter);
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REQ(ch, comp_iter);
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ch = CHILD(ch, 0);
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REQ(ch, gen_if);
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REQ(ch, comp_if);
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expression = ast_for_expr(c, CHILD(ch, 1));
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if (!expression)
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@ -1366,22 +1207,52 @@ ast_for_genexp(struct compiling *c, const node *n)
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if (NCH(ch) == 3)
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ch = CHILD(ch, 2);
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}
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/* on exit, must guarantee that ch is a gen_for */
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if (TYPE(ch) == gen_iter)
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/* on exit, must guarantee that ch is a comp_for */
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if (TYPE(ch) == comp_iter)
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ch = CHILD(ch, 0);
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ge->ifs = ifs;
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comp->ifs = ifs;
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}
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asdl_seq_SET(genexps, i, ge);
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asdl_seq_SET(comps, i, comp);
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}
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return GeneratorExp(elt, genexps, LINENO(n), n->n_col_offset, c->c_arena);
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if (type == COMP_GENEXP)
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return GeneratorExp(elt, comps, LINENO(n), n->n_col_offset, c->c_arena);
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else if (type == COMP_LISTCOMP)
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return ListComp(elt, comps, LINENO(n), n->n_col_offset, c->c_arena);
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else if (type == COMP_SETCOMP)
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return SetComp(elt, comps, LINENO(n), n->n_col_offset, c->c_arena);
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else
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/* Should never happen */
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return NULL;
|
||||
}
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|
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static expr_ty
|
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ast_for_genexp(struct compiling *c, const node *n)
|
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{
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assert(TYPE(n) == (testlist_comp) || TYPE(n) == (argument));
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return ast_for_comprehension(c, n, COMP_GENEXP);
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}
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static expr_ty
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ast_for_listcomp(struct compiling *c, const node *n)
|
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{
|
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assert(TYPE(n) == (testlist_comp));
|
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return ast_for_comprehension(c, n, COMP_LISTCOMP);
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||||
}
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||||
|
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static expr_ty
|
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ast_for_setcomp(struct compiling *c, const node *n)
|
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{
|
||||
assert(TYPE(n) == (dictorsetmaker));
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return ast_for_comprehension(c, n, COMP_SETCOMP);
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||||
}
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||||
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||||
|
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static expr_ty
|
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ast_for_atom(struct compiling *c, const node *n)
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{
|
||||
/* atom: '(' [yield_expr|testlist_gexp] ')' | '[' [listmaker] ']'
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||||
| '{' [dictsetmaker] '}' | NAME | NUMBER | STRING+
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||||
/* atom: '(' [yield_expr|testlist_comp] ')' | '[' [testlist_comp] ']'
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||||
| '{' [dictmaker|testlist_comp] '}' | NAME | NUMBER | STRING+
|
||||
*/
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node *ch = CHILD(n, 0);
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int bytesmode = 0;
|
||||
|
|
@ -1420,18 +1291,19 @@ ast_for_atom(struct compiling *c, const node *n)
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|||
|
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if (TYPE(ch) == yield_expr)
|
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return ast_for_expr(c, ch);
|
||||
|
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if ((NCH(ch) > 1) && (TYPE(CHILD(ch, 1)) == gen_for))
|
||||
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||||
/* testlist_comp: test ( comp_for | (',' test)* [','] ) */
|
||||
if ((NCH(ch) > 1) && (TYPE(CHILD(ch, 1)) == comp_for))
|
||||
return ast_for_genexp(c, ch);
|
||||
|
||||
return ast_for_testlist_gexp(c, ch);
|
||||
return ast_for_testlist(c, ch);
|
||||
case LSQB: /* list (or list comprehension) */
|
||||
ch = CHILD(n, 1);
|
||||
|
||||
if (TYPE(ch) == RSQB)
|
||||
return List(NULL, Load, LINENO(n), n->n_col_offset, c->c_arena);
|
||||
|
||||
REQ(ch, listmaker);
|
||||
REQ(ch, testlist_comp);
|
||||
if (NCH(ch) == 1 || TYPE(CHILD(ch, 1)) == COMMA) {
|
||||
asdl_seq *elts = seq_for_testlist(c, ch);
|
||||
if (!elts)
|
||||
|
|
@ -1442,27 +1314,32 @@ ast_for_atom(struct compiling *c, const node *n)
|
|||
else
|
||||
return ast_for_listcomp(c, ch);
|
||||
case LBRACE: {
|
||||
/* dictsetmaker: test ':' test (',' test ':' test)* [','] |
|
||||
* test (',' test)* [','] */
|
||||
/* dictorsetmaker: test ':' test (',' test ':' test)* [','] |
|
||||
* test (gen_for | (',' test)* [',']) */
|
||||
int i, size;
|
||||
asdl_seq *keys, *values;
|
||||
|
||||
ch = CHILD(n, 1);
|
||||
if (NCH(ch) == 1 || (NCH(ch) > 0 && STR(CHILD(ch, 1))[0] == ',')) {
|
||||
/* it's a set */
|
||||
if (TYPE(ch) == RBRACE) {
|
||||
/* it's an empty dict */
|
||||
return Dict(NULL, NULL, LINENO(n), n->n_col_offset, c->c_arena);
|
||||
} else if (NCH(ch) == 1 || TYPE(CHILD(ch, 1)) == COMMA) {
|
||||
/* it's a simple set */
|
||||
size = (NCH(ch) + 1) / 2; /* +1 in case no trailing comma */
|
||||
keys = asdl_seq_new(size, c->c_arena);
|
||||
if (!keys)
|
||||
asdl_seq *elts = asdl_seq_new(size, c->c_arena);
|
||||
if (!elts)
|
||||
return NULL;
|
||||
|
||||
for (i = 0; i < NCH(ch); i += 2) {
|
||||
expr_ty expression;
|
||||
expression = ast_for_expr(c, CHILD(ch, i));
|
||||
if (!expression)
|
||||
return NULL;
|
||||
asdl_seq_SET(keys, i / 2, expression);
|
||||
asdl_seq_SET(elts, i / 2, expression);
|
||||
}
|
||||
return Set(keys, LINENO(n), n->n_col_offset, c->c_arena);
|
||||
return Set(elts, LINENO(n), n->n_col_offset, c->c_arena);
|
||||
} else if (TYPE(CHILD(ch, 1)) == comp_for) {
|
||||
/* it's a set comprehension */
|
||||
return ast_for_setcomp(c, ch);
|
||||
} else {
|
||||
/* it's a dict */
|
||||
size = (NCH(ch) + 1) / 4; /* +1 in case no trailing comma */
|
||||
|
|
@ -1790,6 +1667,7 @@ ast_for_expr(struct compiling *c, const node *n)
|
|||
{
|
||||
/* handle the full range of simple expressions
|
||||
test: or_test ['if' or_test 'else' test] | lambdef
|
||||
test_nocond: or_test | lambdef_nocond
|
||||
or_test: and_test ('or' and_test)*
|
||||
and_test: not_test ('and' not_test)*
|
||||
not_test: 'not' not_test | comparison
|
||||
|
|
@ -1802,15 +1680,6 @@ ast_for_expr(struct compiling *c, const node *n)
|
|||
term: factor (('*'|'/'|'%'|'//') factor)*
|
||||
factor: ('+'|'-'|'~') factor | power
|
||||
power: atom trailer* ('**' factor)*
|
||||
|
||||
As well as modified versions that exist for backward compatibility,
|
||||
to explicitly allow:
|
||||
[ x for x in lambda: 0, lambda: 1 ]
|
||||
(which would be ambiguous without these extra rules)
|
||||
|
||||
old_test: or_test | old_lambdef
|
||||
old_lambdef: 'lambda' [vararglist] ':' old_test
|
||||
|
||||
*/
|
||||
|
||||
asdl_seq *seq;
|
||||
|
|
@ -1819,9 +1688,9 @@ ast_for_expr(struct compiling *c, const node *n)
|
|||
loop:
|
||||
switch (TYPE(n)) {
|
||||
case test:
|
||||
case old_test:
|
||||
case test_nocond:
|
||||
if (TYPE(CHILD(n, 0)) == lambdef ||
|
||||
TYPE(CHILD(n, 0)) == old_lambdef)
|
||||
TYPE(CHILD(n, 0)) == lambdef_nocond)
|
||||
return ast_for_lambdef(c, CHILD(n, 0));
|
||||
else if (NCH(n) > 1)
|
||||
return ast_for_ifexpr(c, n);
|
||||
|
|
@ -1947,7 +1816,7 @@ ast_for_call(struct compiling *c, const node *n, expr_ty func)
|
|||
/*
|
||||
arglist: (argument ',')* (argument [',']| '*' test [',' '**' test]
|
||||
| '**' test)
|
||||
argument: [test '='] test [gen_for] # Really [keyword '='] test
|
||||
argument: [test '='] test [comp_for] # Really [keyword '='] test
|
||||
*/
|
||||
|
||||
int i, nargs, nkeywords, ngens;
|
||||
|
|
@ -1965,7 +1834,7 @@ ast_for_call(struct compiling *c, const node *n, expr_ty func)
|
|||
if (TYPE(ch) == argument) {
|
||||
if (NCH(ch) == 1)
|
||||
nargs++;
|
||||
else if (TYPE(CHILD(ch, 1)) == gen_for)
|
||||
else if (TYPE(CHILD(ch, 1)) == comp_for)
|
||||
ngens++;
|
||||
else
|
||||
nkeywords++;
|
||||
|
|
@ -2005,7 +1874,7 @@ ast_for_call(struct compiling *c, const node *n, expr_ty func)
|
|||
return NULL;
|
||||
asdl_seq_SET(args, nargs++, e);
|
||||
}
|
||||
else if (TYPE(CHILD(ch, 1)) == gen_for) {
|
||||
else if (TYPE(CHILD(ch, 1)) == comp_for) {
|
||||
e = ast_for_genexp(c, ch);
|
||||
if (!e)
|
||||
return NULL;
|
||||
|
|
@ -2057,18 +1926,16 @@ ast_for_call(struct compiling *c, const node *n, expr_ty func)
|
|||
static expr_ty
|
||||
ast_for_testlist(struct compiling *c, const node* n)
|
||||
{
|
||||
/* testlist_gexp: test (',' test)* [','] */
|
||||
/* testlist_comp: test (comp_for | (',' test)* [',']) */
|
||||
/* testlist: test (',' test)* [','] */
|
||||
/* testlist_safe: test (',' test)+ [','] */
|
||||
/* testlist1: test (',' test)* */
|
||||
assert(NCH(n) > 0);
|
||||
if (TYPE(n) == testlist_gexp) {
|
||||
if (TYPE(n) == testlist_comp) {
|
||||
if (NCH(n) > 1)
|
||||
assert(TYPE(CHILD(n, 1)) != gen_for);
|
||||
assert(TYPE(CHILD(n, 1)) != comp_for);
|
||||
}
|
||||
else {
|
||||
assert(TYPE(n) == testlist ||
|
||||
TYPE(n) == testlist_safe ||
|
||||
TYPE(n) == testlist1);
|
||||
}
|
||||
if (NCH(n) == 1)
|
||||
|
|
@ -2081,17 +1948,6 @@ ast_for_testlist(struct compiling *c, const node* n)
|
|||
}
|
||||
}
|
||||
|
||||
static expr_ty
|
||||
ast_for_testlist_gexp(struct compiling *c, const node* n)
|
||||
{
|
||||
/* testlist_gexp: test ( gen_for | (',' test)* [','] ) */
|
||||
/* argument: test [ gen_for ] */
|
||||
assert(TYPE(n) == testlist_gexp || TYPE(n) == argument);
|
||||
if (NCH(n) > 1 && TYPE(CHILD(n, 1)) == gen_for)
|
||||
return ast_for_genexp(c, n);
|
||||
return ast_for_testlist(c, n);
|
||||
}
|
||||
|
||||
static stmt_ty
|
||||
ast_for_expr_stmt(struct compiling *c, const node *n)
|
||||
{
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue