doc: improve html and pdf rendering

[bison.git] / src / scan-skel.l

diff --git a/src/scan-skel.l b/src/scan-skel.l
index 951a9fda5b3273b5583c51e24bf05a0aa4fc5299..22756267c6aeba6ad02404d519b1a605260e6bf1 100644 (file)
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,123 +1,271 @@
 /* Scan Bison Skeletons.                                       -*- C -*-
 
 /* Scan Bison Skeletons.                                       -*- C -*-
 

-   Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2001-2015 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 

-   Bison is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.

 
 

-   Bison is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.

 
    You should have received a copy of the GNU General Public License
 
    You should have received a copy of the GNU General Public License

-   along with Bison; see the file COPYING.  If not, write to the Free
-   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-   02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 

-%option nodefault noyywrap nounput never-interactive debug
+%option nodefault noyywrap noinput nounput never-interactive debug

 %option prefix="skel_" outfile="lex.yy.c"
 
 %{
 %option prefix="skel_" outfile="lex.yy.c"
 
 %{

-#include "system.h"
+/* Work around a bug in flex 2.5.31.  See Debian bug 333231
+   <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>.  */
+#undef skel_wrap
+#define skel_wrap() 1

 
 

+#define FLEX_PREFIX(Id) skel_ ## Id
+#include <src/flex-scanner.h>
+
+#include <dirname.h>

 #include <error.h>
 #include <quotearg.h>
 
 #include <error.h>
 #include <quotearg.h>
 

-#include "complain.h"
-#include "getargs.h"
-#include "files.h"
+#include <src/complain.h>
+#include <src/getargs.h>
+#include <src/files.h>
+#include <src/scan-skel.h>

 
 

-int skel_lex (void);
+#define YY_DECL static int skel_lex (void)
+YY_DECL;

 
 

-/* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
-int skel_get_lineno (void);
-FILE *skel_get_in (void);
-FILE *skel_get_out (void);
-int skel_get_leng (void);
-char *skel_get_text (void);
-void skel_set_lineno (int);
-void skel_set_in (FILE *);
-void skel_set_out (FILE *);
-int skel_get_debug (void);
-void skel_set_debug (int);
-int skel_lex_destroy (void);
+typedef void (*at_directive)(int, char**, char **, int*);
+static void at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun);
+static void at_basename (int argc, char *argv[], char**, int*);
+static void at_complain (int argc, char *argv[], char**, int*);
+static void at_output (int argc, char *argv[], char **name, int *lineno);
+static void fail_for_at_directive_too_many_args (char const *at_directive_name);
+static void fail_for_at_directive_too_few_args (char const *at_directive_name);
+static void fail_for_invalid_at (char const *at);
+%}

 
 

-#define QPUTS(String) \
-   fputs (quotearg_style (c_quoting_style, (String)), yyout)
+%x SC_AT_DIRECTIVE_ARGS
+%x SC_AT_DIRECTIVE_SKIP_WS

 
 

-%}

 %%
 
 %{
 %%
 
 %{

-  int lineno IF_LINT (= 0);
-  char *outname = NULL;
+  int out_lineno PACIFY_CC (= 0);
+  char *out_name = NULL;
+
+  /* Currently, only the @complain directive takes multiple arguments, and
+     never more than 7, with argv[0] being the directive name and argv[1]
+     being the type of complaint to dispatch. */
+#define ARGC_MAX 9
+  int argc = 0;
+  char *argv[ARGC_MAX];
+  at_directive at_ptr = NULL;

 %}
 
 %}
 

-"@output ".*\n {
-  char const *filename = yytext + sizeof "@output " - 1;
-  yytext[yyleng - 1] = '\0';
+"@@" fputc ('@', yyout);
+"@{" fputc ('[', yyout);
+"@}" fputc (']', yyout);
+"@'" continue;  /* Used by b4_cat in ../data/bison.m4.  */
+@\n  continue;

 
 

-  if (*filename == '@')
-    {
-      if (strcmp (filename, "@output_header_name@") == 0)
-       filename = spec_defines_file;
-      else if (strcmp (filename, "@output_parser_name@") == 0)
-       filename = parser_file_name;
-      else
-       fatal ("invalid token in skeleton: %s", yytext);
-    }
+"@oline@"  fprintf (yyout, "%d", out_lineno + 1);
+"@ofile@"  fputs (quotearg_style (c_quoting_style, out_name), yyout);
+
+"@basename("    at_init (&argc, argv, &at_ptr, &at_basename);
+"@complain("    at_init (&argc, argv, &at_ptr, &at_complain);
+"@output("      at_init (&argc, argv, &at_ptr, &at_output);
+
+  /* This pattern must not match more than the previous @ patterns. */
+@[^@{}\'(\n]*   fail_for_invalid_at (yytext);
+\n              out_lineno++; ECHO;
+[^@\n]+         ECHO;

 
 

-  if (outname)
+<INITIAL><<EOF>> {
+  if (out_name)

     {
     {

-      free (outname);
+      free (out_name);

       xfclose (yyout);
     }
       xfclose (yyout);
     }

-  outname = xstrdup (filename);
-  yyout = xfopen (outname, "w");
-  lineno = 1;
+  return EOF;

 }
 
 }
 

-"@@"      fputc ('@', yyout);
-"@{"      fputc ('[', yyout);
-"@}"      fputc (']', yyout);
+<SC_AT_DIRECTIVE_ARGS>
+{
+  [^@]+  STRING_GROW;

 
 

-"@oline@"  fprintf (yyout, "%d", lineno + 1);
-"@ofile@"  QPUTS (outname);
-"@output_parser_name@" QPUTS (parser_file_name);
-"@output_header_name@" QPUTS (spec_defines_file);
+  "@@"   obstack_1grow (&obstack_for_string, '@');
+  "@{"   obstack_1grow (&obstack_for_string, '[');
+  "@}"   obstack_1grow (&obstack_for_string, ']');
+  "@'"   continue; /* For starting an argument that begins with whitespace. */
+  @\n    continue;

 
 

-  /* This pattern must not match more than the previous @ patterns. */
-@[^{}@\n]* fatal ("invalid @ in skeleton: %s", yytext);
-\n        lineno++; ECHO;
-[^@\n]+           ECHO;
+  @[,)] {
+    if (argc >= ARGC_MAX)
+      fail_for_at_directive_too_many_args (argv[0]);

 
 

-<<EOF>> {
-  if (outname)
-    {
-      free (outname);
-      xfclose (yyout);
-    }
-  return EOF;
+    argv[argc++] = obstack_finish0 (&obstack_for_string);
+
+    /* Like M4, skip whitespace after a comma.  */
+    if (yytext[1] == ',')
+      BEGIN SC_AT_DIRECTIVE_SKIP_WS;
+    else
+      {
+        aver (at_ptr);
+        at_ptr (argc, argv, &out_name, &out_lineno);
+        obstack_free (&obstack_for_string, argv[0]);
+        argc = 0;
+        BEGIN INITIAL;
+      }
+  }
+
+  @.?  fail_for_invalid_at (yytext);
+}
+
+<SC_AT_DIRECTIVE_SKIP_WS>
+{
+  [ \t\r\n]    continue;
+  .            yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS;
+}
+
+<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>
+{
+  <<EOF>>  complain (NULL, fatal, _("unclosed %s directive in skeleton"), argv[0]);

 }
 }

+

 %%
 
 %%
 

+static void
+at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun)
+{
+  *at_ptr = fun;
+  yytext[yyleng-1] = '\0';
+  obstack_grow (&obstack_for_string, yytext, yyleng);
+  argv[(*argc)++] = obstack_finish (&obstack_for_string);
+  BEGIN SC_AT_DIRECTIVE_ARGS;
+}
+

 /*------------------------.
 | Scan a Bison skeleton.  |
 `------------------------*/
 
 /*------------------------.
 | Scan a Bison skeleton.  |
 `------------------------*/
 

-void scan_skel (FILE *);
-

 void
 scan_skel (FILE *in)
 {
 void
 scan_skel (FILE *in)
 {

+  static bool initialized = false;
+  if (!initialized)
+    {
+      initialized = true;
+      obstack_init (&obstack_for_string);
+    }

   skel_in = in;
   skel__flex_debug = trace_flag & trace_skeleton;
   skel_lex ();
   skel_in = in;
   skel__flex_debug = trace_flag & trace_skeleton;
   skel_lex ();

+}
+
+void
+skel_scanner_free (void)
+{
+  obstack_free (&obstack_for_string, 0);

   /* Reclaim Flex's buffers.  */
   /* Reclaim Flex's buffers.  */

-  yy_delete_buffer (YY_CURRENT_BUFFER);
+  yylex_destroy ();
+}
+
+static inline warnings
+flag (const char *arg)
+{
+  /* compare with values issued from b4_error */
+  if (STREQ (arg, "complain"))
+    return complaint;
+  else if (STREQ (arg, "deprecated"))
+    return Wdeprecated;
+  else if (STREQ (arg, "fatal"))
+    return fatal;
+  else if (STREQ (arg, "note"))
+    return silent | complaint | no_caret;
+  else if (STREQ (arg, "warn"))
+    return Wother;
+  else
+    abort ();
+}
+
+static void
+at_basename (int argc, char *argv[], char **out_namep, int *out_linenop)
+{
+  (void) out_namep;
+  (void) out_linenop;
+  if (2 < argc)
+    fail_for_at_directive_too_many_args (argv[0]);
+  fputs (last_component (argv[1]), yyout);
+}
+
+static void
+at_complain (int argc, char *argv[], char **out_namep, int *out_linenop)
+{
+  static unsigned indent;
+  warnings w = flag (argv[1]);
+  location loc;
+  location *locp = NULL;
+
+  (void) out_namep;
+  (void) out_linenop;
+
+  if (argc < 4)
+    fail_for_at_directive_too_few_args (argv[0]);
+  if (argv[2] && argv[2][0])
+    {
+      boundary_set_from_string (&loc.start, argv[2]);
+      boundary_set_from_string (&loc.end, argv[3]);
+      locp = &loc;
+    }
+  if (w & silent)
+    indent += SUB_INDENT;
+  else
+    indent = 0;
+  complain_args (locp, w, &indent, argc - 4, argv + 4);
+  if (w & silent)
+    indent -= SUB_INDENT;
+}
+
+static void
+at_output (int argc, char *argv[], char **out_namep, int *out_linenop)
+{
+  if (2 < argc)
+    fail_for_at_directive_too_many_args (argv[0]);
+  if (*out_namep)
+    {
+      free (*out_namep);
+      xfclose (yyout);
+    }
+  *out_namep = xstrdup (argv[1]);
+  output_file_name_check (out_namep, true);
+  /* If there were errors, do not generate the output.  */
+  yyout = xfopen (complaint_status ? "/dev/null" : *out_namep, "w");
+  *out_linenop = 1;
+}
+
+static void
+fail_for_at_directive_too_few_args (char const *at_directive_name)
+{
+  complain (NULL, fatal, _("too few arguments for %s directive in skeleton"),
+            at_directive_name);
+}
+
+static void
+fail_for_at_directive_too_many_args (char const *at_directive_name)
+{
+  complain (NULL, fatal, _("too many arguments for %s directive in skeleton"),
+            at_directive_name);
+}
+
+static void
+fail_for_invalid_at (char const *at)
+{
+  complain (NULL, fatal, "invalid @ in skeleton: %s", at);

 }
 }