bpo-33691: Add _PyAST_GetDocString(). (GH-7236)
diff --git a/Python/ast.c b/Python/ast.c
index 43bd786..3b4cd16 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -5260,3 +5260,23 @@
FstringParser_Dealloc(&state);
return NULL;
}
+
+PyObject *
+_PyAST_GetDocString(asdl_seq *body)
+{
+ if (!asdl_seq_LEN(body)) {
+ return NULL;
+ }
+ stmt_ty st = (stmt_ty)asdl_seq_GET(body, 0);
+ if (st->kind != Expr_kind) {
+ return NULL;
+ }
+ expr_ty e = st->v.Expr.value;
+ if (e->kind == Str_kind) {
+ return e->v.Str.s;
+ }
+ if (e->kind == Constant_kind && PyUnicode_CheckExact(e->v.Constant.value)) {
+ return e->v.Constant.value;
+ }
+ return NULL;
+}
diff --git a/Python/ast_opt.c b/Python/ast_opt.c
index a998d1f..5e57638 100644
--- a/Python/ast_opt.c
+++ b/Python/ast_opt.c
@@ -1,6 +1,8 @@
/* AST Optimizer */
#include "Python.h"
#include "Python-ast.h"
+#include "node.h"
+#include "ast.h"
/* TODO: is_const and get_const_value are copied from Python/compile.c.
@@ -468,36 +470,18 @@
}
static int
-isdocstring(stmt_ty s)
-{
- if (s->kind != Expr_kind)
- return 0;
- if (s->v.Expr.value->kind == Str_kind)
- return 1;
- if (s->v.Expr.value->kind == Constant_kind)
- return PyUnicode_CheckExact(s->v.Expr.value->v.Constant.value);
- return 0;
-}
-
-static int
astfold_body(asdl_seq *stmts, PyArena *ctx_, int optimize_)
{
- if (!asdl_seq_LEN(stmts)) {
- return 1;
- }
- int docstring = isdocstring((stmt_ty)asdl_seq_GET(stmts, 0));
+ int docstring = _PyAST_GetDocString(stmts) != NULL;
CALL_SEQ(astfold_stmt, stmt_ty, stmts);
- if (docstring) {
- return 1;
- }
- stmt_ty st = (stmt_ty)asdl_seq_GET(stmts, 0);
- if (isdocstring(st)) {
+ if (!docstring && _PyAST_GetDocString(stmts) != NULL) {
+ stmt_ty st = (stmt_ty)asdl_seq_GET(stmts, 0);
asdl_seq *values = _Py_asdl_seq_new(1, ctx_);
if (!values) {
return 0;
}
asdl_seq_SET(values, 0, st->v.Expr.value);
- expr_ty expr = _Py_JoinedStr(values, st->lineno, st->col_offset, ctx_);
+ expr_ty expr = JoinedStr(values, st->lineno, st->col_offset, ctx_);
if (!expr) {
return 0;
}
diff --git a/Python/compile.c b/Python/compile.c
index 42ae508..3528670 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1393,18 +1393,6 @@
}
static int
-compiler_isdocstring(stmt_ty s)
-{
- if (s->kind != Expr_kind)
- return 0;
- if (s->v.Expr.value->kind == Str_kind)
- return 1;
- if (s->v.Expr.value->kind == Constant_kind)
- return PyUnicode_CheckExact(s->v.Expr.value->v.Constant.value);
- return 0;
-}
-
-static int
is_const(expr_ty e)
{
switch (e->kind) {
@@ -1603,6 +1591,7 @@
{
int i = 0;
stmt_ty st;
+ PyObject *docstring;
/* Set current line number to the line number of first statement.
This way line number for SETUP_ANNOTATIONS will always
@@ -1619,14 +1608,17 @@
}
if (!asdl_seq_LEN(stmts))
return 1;
- st = (stmt_ty)asdl_seq_GET(stmts, 0);
/* if not -OO mode, set docstring */
- if (compiler_isdocstring(st) && c->c_optimize < 2) {
- /* don't generate docstrings if -OO */
- i = 1;
- VISIT(c, expr, st->v.Expr.value);
- if (!compiler_nameop(c, __doc__, Store))
- return 0;
+ if (c->c_optimize < 2) {
+ docstring = _PyAST_GetDocString(stmts);
+ if (docstring) {
+ i = 1;
+ st = (stmt_ty)asdl_seq_GET(stmts, 0);
+ assert(st->kind == Expr_kind);
+ VISIT(c, expr, st->v.Expr.value);
+ if (!compiler_nameop(c, __doc__, Store))
+ return 0;
+ }
}
for (; i < asdl_seq_LEN(stmts); i++)
VISIT(c, stmt, (stmt_ty)asdl_seq_GET(stmts, i));
@@ -1979,15 +1971,13 @@
compiler_function(struct compiler *c, stmt_ty s, int is_async)
{
PyCodeObject *co;
- PyObject *qualname, *first_const = Py_None;
+ PyObject *qualname, *docstring = NULL;
arguments_ty args;
expr_ty returns;
identifier name;
asdl_seq* decos;
asdl_seq *body;
- stmt_ty st;
Py_ssize_t i, funcflags;
- int docstring;
int annotations;
int scope_type;
@@ -2034,15 +2024,10 @@
}
/* if not -OO mode, add docstring */
- st = (stmt_ty)asdl_seq_GET(body, 0);
- docstring = compiler_isdocstring(st);
- if (docstring && c->c_optimize < 2) {
- if (st->v.Expr.value->kind == Constant_kind)
- first_const = st->v.Expr.value->v.Constant.value;
- else
- first_const = st->v.Expr.value->v.Str.s;
+ if (c->c_optimize < 2) {
+ docstring = _PyAST_GetDocString(body);
}
- if (compiler_add_const(c, first_const) < 0) {
+ if (compiler_add_const(c, docstring ? docstring : Py_None) < 0) {
compiler_exit_scope(c);
return 0;
}
diff --git a/Python/future.c b/Python/future.c
index 03a97c8..4ea6827 100644
--- a/Python/future.c
+++ b/Python/future.c
@@ -5,6 +5,7 @@
#include "graminit.h"
#include "code.h"
#include "symtable.h"
+#include "ast.h"
#define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
#define ERR_LATE_FUTURE \
@@ -63,7 +64,6 @@
future_parse(PyFutureFeatures *ff, mod_ty mod, PyObject *filename)
{
int i, done = 0, prev_line = 0;
- stmt_ty first;
if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
return 1;
@@ -80,11 +80,7 @@
*/
i = 0;
- first = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
- if (first->kind == Expr_kind
- && (first->v.Expr.value->kind == Str_kind
- || (first->v.Expr.value->kind == Constant_kind
- && PyUnicode_CheckExact(first->v.Expr.value->v.Constant.value))))
+ if (_PyAST_GetDocString(mod->v.Module.body) != NULL)
i++;
for (; i < asdl_seq_LEN(mod->v.Module.body); i++) {