[3.12] gh-121130: Fix f-string format specifiers with debug expressions (GH-121150) (#122063)

Doc/library/ast.rst

@@ -302,9 +302,7 @@ Literals
                                 Name(id='a', ctx=Load())],
                             keywords=[]),
                         conversion=-1,
-                        format_spec=JoinedStr(
-                            values=[
-                                Constant(value='.3')]))]))
+                        format_spec=Constant(value='.3'))]))
 
 
 .. class:: List(elts, ctx)

Misc/NEWS.d/next/Core and Builtins/2024-06-29-10-46-14.gh-issue-121130.Rj66Xs.rst

@@ -0,0 +1,2 @@
+Fix f-strings with debug expressions in format specifiers. Patch by Pablo
+Galindo

Parser/tokenizer.h

@@ -14,17 +14,15 @@ extern "C" {
 #define MAXLEVEL 200        /* Max parentheses level */
 #define MAXFSTRINGLEVEL 150 /* Max f-string nesting level */
 
-enum decoding_state {
-    STATE_INIT,
-    STATE_SEEK_CODING,
-    STATE_NORMAL
-};
+enum decoding_state { STATE_INIT, STATE_SEEK_CODING, STATE_NORMAL };
 
 enum interactive_underflow_t {
-    /* Normal mode of operation: return a new token when asked in interactive mode */
+  /* Normal mode of operation: return a new token when asked in interactive mode
+   */
   IUNDERFLOW_NORMAL,
-    /* Forcefully return ENDMARKER when asked for a new token in interactive mode. This
-     * can be used to prevent the tokenizer to prompt the user for new tokens */
+  /* Forcefully return ENDMARKER when asked for a new token in interactive mode.
+   * This can be used to prevent the tokenizer to prompt the user for new tokens
+   */
   IUNDERFLOW_STOP,
 };
 
@@ -51,8 +49,8 @@ typedef struct _tokenizer_mode {
   char f_string_quote;
   int f_string_quote_size;
   int f_string_raw;
-    const char* f_string_start;
-    const char* f_string_multi_line_start;
+  const char *f_string_start;
+  const char *f_string_multi_line_start;
   int f_string_line_start;
 
   Py_ssize_t f_string_start_offset;
@@ -60,20 +58,24 @@ typedef struct _tokenizer_mode {
 
   Py_ssize_t last_expr_size;
   Py_ssize_t last_expr_end;
-    char* last_expr_buffer;
+  char *last_expr_buffer;
   int f_string_debug;
+  int in_format_spec;
 } tokenizer_mode;
 
 /* Tokenizer state */
 struct tok_state {
   /* Input state; buf <= cur <= inp <= end */
   /* NB an entire line is held in the buffer */
-    char *buf;          /* Input buffer, or NULL; malloc'ed if fp != NULL or readline != NULL */
+  char *buf; /* Input buffer, or NULL; malloc'ed if fp != NULL or readline !=
+                NULL */
   char *cur; /* Next character in buffer */
   char *inp; /* End of data in buffer */
   int fp_interactive;          /* If the file descriptor is interactive */
-    char *interactive_src_start; /* The start of the source parsed so far in interactive mode */
-    char *interactive_src_end; /* The end of the source parsed so far in interactive mode */
+  char *interactive_src_start; /* The start of the source parsed so far in
+                                  interactive mode */
+  char *interactive_src_end;   /* The end of the source parsed so far in
+                                  interactive mode */
   const char *end;             /* End of input buffer if buf != NULL */
   const char *start;           /* Start of current token if not NULL */
   int done; /* E_OK normally, E_EOF at EOF, otherwise error code */
@@ -103,16 +105,16 @@ struct tok_state {
   int decoding_erred;           /* whether erred in decoding  */
   char *encoding;               /* Source encoding. */
   int cont_line;                /* whether we are in a continuation line. */
-    const char* line_start;     /* pointer to start of current line */
-    const char* multi_line_start; /* pointer to start of first line of
+  const char *line_start;       /* pointer to start of current line */
+  const char *multi_line_start; /* pointer to start of first line of
                                    a single line or multi line string
                                    expression (cf. issue 16806) */
   PyObject *decoding_readline;  /* open(...).readline */
   PyObject *decoding_buffer;
   PyObject *readline; /* readline() function */
-    const char* enc;        /* Encoding for the current str. */
-    char* str;          /* Source string being tokenized (if tokenizing from a string)*/
-    char* input;       /* Tokenizer's newline translated copy of the string. */
+  const char *enc;    /* Encoding for the current str. */
+  char *str;   /* Source string being tokenized (if tokenizing from a string)*/
+  char *input; /* Tokenizer's newline translated copy of the string. */
 
   int type_comments; /* Whether to look for type comments */
 
@@ -138,8 +140,9 @@ struct tok_state {
 
 extern struct tok_state *_PyTokenizer_FromString(const char *, int, int);
 extern struct tok_state *_PyTokenizer_FromUTF8(const char *, int, int);
-extern struct tok_state *_PyTokenizer_FromReadline(PyObject*, const char*, int, int);
-extern struct tok_state *_PyTokenizer_FromFile(FILE *, const char*,
+extern struct tok_state *_PyTokenizer_FromReadline(PyObject *, const char *,
+                                                   int, int);
+extern struct tok_state *_PyTokenizer_FromFile(FILE *, const char *,
                                                const char *, const char *);
 extern void _PyTokenizer_Free(struct tok_state *);
 extern void _PyToken_Free(struct token *);