fixits: handle %file-prefix

* src/files.h, src/files.c (spec_file_prefix_loc): New.
* src/scan-gram.l (%file-prefix): Delegate diagnostics to...
* src/parse-gram.y (handle_file_prefix): here.
* src/complain.c (duplicate_directive): Quote the directive.
* tests/input.at: Adjust.

src/complain.c

@@ -407,7 +407,7 @@ duplicate_directive (char const *directive,
   if (feature_flag & feature_caret)
     complain_indent (&second, Wother, &i, _("duplicate directive"));
   else
-    complain_indent (&second, Wother, &i, _("duplicate directive: %s"), directive);
+    complain_indent (&second, Wother, &i, _("duplicate directive: %s"), quote (directive));
   i += SUB_INDENT;
   complain_indent (&first, Wother, &i, _("previous declaration"));
   fixits_register (&second, "");

src/files.c

@@ -43,6 +43,7 @@
 
 char const *spec_outfile = NULL;       /* for -o. */
 char const *spec_file_prefix = NULL;   /* for -b. */
+location spec_file_prefix_loc = EMPTY_LOCATION_INIT;
 char const *spec_name_prefix = NULL;   /* for -p. */
 char *spec_verbose_file = NULL;  /* for --verbose. */
 char *spec_graph_file = NULL;    /* for -g. */

src/files.h

@@ -21,6 +21,7 @@
 #ifndef FILES_H_
 # define FILES_H_
 
+# include "location.h"
 # include "uniqstr.h"
 
 /* File name specified with -o for the output file, or 0 if no -o.  */
@@ -34,6 +35,7 @@ extern const char *spec_name_prefix;
 
 /* File name prefix specified with -b, or 0 if no -b.  */
 extern char const *spec_file_prefix;
+extern location spec_file_prefix_loc;
 
 /* --verbose. */
 extern char *spec_verbose_file;

src/parse-gram.y

@@ -85,6 +85,11 @@
   /* Handle a %error-verbose directive.  */
   static void handle_error_verbose (location const *loc, char const *directive);
 
+  /* Handle a %file-prefix directive.  */
+  static void handle_file_prefix (location const *loc,
+                                  location const *dir_loc,
+                                  char const *directive, char const *value);
+
   /* Handle a %name-prefix directive.  */
   static void handle_name_prefix (location const *loc,
                                   char const *directive, char const *value);
@@ -204,7 +209,7 @@
 
 %type <uniqstr>
   BRACKETED_ID ID ID_COLON
-  PERCENT_ERROR_VERBOSE PERCENT_FLAG PERCENT_NAME_PREFIX
+  PERCENT_ERROR_VERBOSE PERCENT_FILE_PREFIX PERCENT_FLAG PERCENT_NAME_PREFIX
   PERCENT_YACC
   TAG tag tag.opt variable
 %printer { fputs ($$, yyo); } <uniqstr>
@@ -312,7 +317,7 @@ prologue_declaration:
 | "%error-verbose"                 { handle_error_verbose (&@$, $1); }
 | "%expect" INT                    { expected_sr_conflicts = $2; }
 | "%expect-rr" INT                 { expected_rr_conflicts = $2; }
-| "%file-prefix" STRING            { spec_file_prefix = $2; }
+| "%file-prefix" STRING            { handle_file_prefix (&@$, &@1, $1, $2); }
 | "%glr-parser"
     {
       nondeterministic_parser = true;
@@ -872,6 +877,30 @@ handle_error_verbose (location const *loc, char const *directive)
 }
 
 
+static void
+handle_file_prefix (location const *loc,
+                    location const *dir_loc,
+                    char const *directive, char const *value)
+{
+  bison_directive (loc, directive);
+  bool warned = false;
+
+  if (location_empty (spec_file_prefix_loc))
+    {
+      spec_file_prefix_loc = *loc;
+      spec_file_prefix = value;
+    }
+  else
+    {
+      duplicate_directive (directive, spec_file_prefix_loc, *loc);
+      warned = true;
+    }
+
+  if (!warned
+      && STRNEQ (directive, "%file-prefix"))
+    deprecated_directive (dir_loc, directive, "%file-prefix");
+}
+
 static void
 handle_name_prefix (location const *loc,
                     char const *directive, char const *value)

src/scan-gram.l

@@ -228,7 +228,7 @@ eqopt    ({sp}=)?
   "%empty"                          return BISON_DIRECTIVE (EMPTY);
   "%expect"                         return BISON_DIRECTIVE (EXPECT);
   "%expect-rr"                      return BISON_DIRECTIVE (EXPECT_RR);
-  "%file-prefix"                    return BISON_DIRECTIVE (FILE_PREFIX);
+  "%file-prefix"                    RETURN_VALUE (PERCENT_FILE_PREFIX, uniqstr_new (yytext));
   "%fixed-output-files"             RETURN_VALUE (PERCENT_YACC, uniqstr_new (yytext));
   "%initial-action"                 return BISON_DIRECTIVE (INITIAL_ACTION);
   "%glr-parser"                     return BISON_DIRECTIVE (GLR_PARSER);
@@ -273,7 +273,7 @@ eqopt    ({sp}=)?
   "%default"[-_]"prec"              DEPRECATED ("%default-prec");
   "%error"[-_]"verbose"             RETURN_VALUE (PERCENT_ERROR_VERBOSE, uniqstr_new (yytext));
   "%expect"[-_]"rr"                 DEPRECATED ("%expect-rr");
-  "%file-prefix"{eqopt}             DEPRECATED ("%file-prefix");
+  "%file-prefix"{eqopt}             RETURN_VALUE (PERCENT_FILE_PREFIX, uniqstr_new (yytext));
   "%fixed"[-_]"output"[-_]"files"   RETURN_VALUE (PERCENT_YACC, uniqstr_new (yytext));
   "%no"[-_]"default"[-_]"prec"      DEPRECATED ("%no-default-prec");
   "%no"[-_]"lines"                  DEPRECATED ("%no-lines");

tests/input.at

@@ -2522,14 +2522,15 @@ input.y:12.1-10: warning: deprecated directive: '%expect_rr', use '%expect-rr' [
 fix-it:"input.y":{12:1-12:11}:"%expect-rr"
 input.y:13.1-14: warning: deprecated directive: '%file-prefix =', use '%file-prefix' [-Wdeprecated]
 fix-it:"input.y":{13:1-13:15}:"%file-prefix"
-input.y:14.1-15.2: warning: deprecated directive: '%file-prefix\n =', use '%file-prefix' [-Wdeprecated]
+input.y:14.1-16.5: warning: duplicate directive: '%file-prefix\n =' [-Wother]
-fix-it:"input.y":{14:1-15:3}:"%file-prefix"
+input.y:13.1-20:       previous declaration [-Wother]
+fix-it:"input.y":{14:1-16:6}:""
 input.y:17.1-19: warning: deprecated directive: '%fixed-output_files', use '%fixed-output-files' [-Wdeprecated]
 fix-it:"input.y":{17:1-17:20}:"%fixed-output-files"
-input.y:18.1-19: warning: duplicate directive: %fixed_output-files [-Wother]
+input.y:18.1-19: warning: duplicate directive: '%fixed_output-files' [-Wother]
 input.y:17.1-19:     previous declaration [-Wother]
 fix-it:"input.y":{18:1-18:20}:""
-input.y:19.1-19: warning: duplicate directive: %fixed-output-files [-Wother]
+input.y:19.1-19: warning: duplicate directive: '%fixed-output-files' [-Wother]
 input.y:17.1-19:     previous declaration [-Wother]
 fix-it:"input.y":{19:1-19:20}:""
 input.y:20.1-19: warning: deprecated directive: '%name-prefix= "foo"', use '%define api.prefix {foo}' [-Wdeprecated]
@@ -2584,8 +2585,6 @@ AT_CHECK([cat input.y], [],
 %define parse.error verbose
 %expect-rr 0
 %file-prefix "foo"
-%file-prefix
-"bar"
 %fixed-output-files
 %define api.prefix {foo}
 %no-default-prec
@@ -2601,10 +2600,10 @@ exp : '0'
 ]])
 
 AT_BISON_CHECK([[-fcaret input.y]], [[1]], [],
-[[input.y:25.1-24: error: %define variable 'api.prefix' redefined
+[[input.y:23.1-24: error: %define variable 'api.prefix' redefined
  %define api.prefix {bar}
  ^~~~~~~~~~~~~~~~~~~~~~~~
-input.y:17.1-24:     previous definition
+input.y:15.1-24:     previous definition
  %define api.prefix {foo}
  ^~~~~~~~~~~~~~~~~~~~~~~~
 input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
@@ -2677,7 +2676,10 @@ AT_DATA_GRAMMAR([[input.y]],
 ]])
 
 AT_BISON_CHECK([[input.y]], [[0]], [[]],
-[[input.y: warning: %expect-rr applies only to GLR parsers [-Wother]
+[[input.y:14.1-15.5: warning: duplicate directive: '%file-prefix' [-Wother]
+input.y:13.1-18:       previous declaration [-Wother]
+input.y: warning: %expect-rr applies only to GLR parsers [-Wother]
+input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
 ]])
 
 AT_CLEANUP

tests/local.at

@@ -707,8 +707,9 @@ if test "$POSIXLY_CORRECT_IS_EXPORTED" = false; then
   # Build expected stderr up to and including the "warnings being
   # treated as errors" message.
   ]AT_DATA([[experr]], [$4])[
-  $PERL -pi -e 's{(.*): warning: (.*)\[-W(.*)\]$}
+  $PERL -pi -e 's{(.*): warning:}{$][1: error:};' \
-                 {$][1: error: $][2\@<:@-Werror=$][3@:>@}' experr
+            -e 's{\[-W(.*)\]$}{@<:@-Werror=$][1@:>@}' \
+                 experr
   ]AT_CHECK([[sed 's,.*/$,,' stderr 1>&2]], [[0]], [[]], [experr])[
 
   # Now check --warnings=error.