bpo-42918: Improve built-in function compile() in mode 'single' (GH-29934) (GH-30040)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
(cherry picked from commit 28179aac796ed1debdce336c4b8ca18e8475d40d)

Co-authored-by: Weipeng Hong <hongweichen8888@sina.com>

1 files changed, 1 insertions, 19 deletions

diff --git a/Parser/pegen.c b/Parser/pegen.c
index bae073c..0504906 100644
--- a/Parser/pegen.c
+++ b/Parser/pegen.c
@@ -1131,31 +1131,13 @@ _PyPegen_number_token(Parser *p)
                            t->end_col_offset, p->arena);
 }
 
-static int // bool
-newline_in_string(Parser *p, const char *cur)
-{
-    for (const char *c = cur; c >= p->tok->buf; c--) {
-        if (*c == '\'' || *c == '"') {
-            return 1;
-        }
-    }
-    return 0;
-}
-
 /* Check that the source for a single input statement really is a single
    statement by looking at what is left in the buffer after parsing.
    Trailing whitespace and comments are OK. */
 static int // bool
 bad_single_statement(Parser *p)
 {
-    const char *cur = strchr(p->tok->buf, '\n');
-
-    /* Newlines are allowed if preceded by a line continuation character
-       or if they appear inside a string. */
-    if (!cur || (cur != p->tok->buf && *(cur - 1) == '\\')
-             || newline_in_string(p, cur)) {
-        return 0;
-    }
+    char *cur = p->tok->cur;
     char c = *cur;
 
     for (;;) {