2007-11-08 Paolo Bonzini <bonzini@gnu.org>

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

diff --git a/src/scan-skel.l b/src/scan-skel.l
index b78e02f59583c322a94f5b54dccf90acac4f737d..6ef53511a674507ec2d42ca179f887e7e3d43bbb 100644 (file)
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,55 +1,306 @@
+/* Scan Bison Skeletons.                                       -*- C -*-
+
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
+   Foundation, Inc.
+
+   This file is part of Bison, the GNU Compiler Compiler.
+
+   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.
+
+   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
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+%option nodefault noyywrap nounput never-interactive debug
+%option prefix="skel_" outfile="lex.yy.c"
+

 %{
 %{

+/* 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 "flex-scanner.h"

 
 

-#include <stdlib.h>
-#include <string.h>
+#include <dirname.h>
+#include <error.h>
+#include <quotearg.h>

 
 

-#include "parse-skel.h"
+#include "complain.h"
+#include "getargs.h"
+#include "files.h"
+#include "scan-skel.h"

 
 

+#define YY_DECL static int skel_lex (void)
+YY_DECL;
+
+#define QPUTS(String) \
+   fputs (quotearg_style (c_quoting_style, String), yyout)
+
+static void at_directive_perform (int at_directive_argc,
+                                  char *at_directive_argv[],
+                                  char **outnamep, int *out_linenop);
+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);

 %}
 
 %}
 

-%option nounput
-%option noyywrap
-%option yylineno
+%x SC_AT_DIRECTIVE_ARGS
+%x SC_AT_DIRECTIVE_SKIP_WS

 
 %%
 
 
 %%
 

-"%%{line}"          { return LINE; }
-"%%{skeleton-line}" { return SLINE; }
+%{
+  int out_lineno IF_LINT (= 0);
+  char *outname = NULL;
+
+  /* Currently, only the @warn, @complain, @fatal, @warn_at, @complain_at, and
+     @fatal_at directives take multiple arguments, and the last three already
+     can't take more than 7.  at_directive_argv[0] is the directive name.  */
+  #define AT_DIRECTIVE_ARGC_MAX 8
+  int at_directive_argc = 0;
+  char *at_directive_argv[AT_DIRECTIVE_ARGC_MAX];
+%}

 
 

-"%%{yacc}"    { return YACC; }
-"%%{section}" { return SECTION; }
+"@@" fputc ('@', yyout);
+"@{" fputc ('[', yyout);
+"@}" fputc (']', yyout);
+"@`" /* Emtpy.  Used by b4_cat in ../data/bison.m4.  */
+@\n  /* Likewise.  */

 
 

-"%%{guards}"   { return GUARDS; }
-"%%{actions}"  { return ACTIONS; }
-"%%{tokendef}" { return TOKENS; }
+"@oline@"  fprintf (yyout, "%d", out_lineno + 1);
+"@ofile@"  QPUTS (outname);
+"@dir_prefix@" QPUTS (dir_prefix);

 
 

-"%%{"[a-zA-Z][0-9a-zA-Z_-]+"}" { /* Muscle.  */
-  size_t len = strlen (yytext);
-  yylval.string = (char*) malloc (len - 3);
-  strncpy (yylval.string, yytext + 3, len - 4);
-  yylval.string[len - 4] = 0;
-  return MUSCLE;
+@[a-z_]+"(" {
+  yytext[yyleng-1] = '\0';
+  obstack_grow (&obstack_for_string, yytext, yyleng);
+  at_directive_argv[at_directive_argc++] =
+    obstack_finish (&obstack_for_string);
+  BEGIN SC_AT_DIRECTIVE_ARGS;

 }
 
 }
 

-"%%\"".*"\"" { /* String.  */
-  size_t len = strlen (yytext);
-  yylval.string = (char*) malloc (len - 3);
-  strncpy (yylval.string, yytext + 3, len - 4);
-  yylval.string[len - 4] = 0;
-  return STRING;
+  /* This pattern must not match more than the previous @ patterns. */
+@[^@{}`(\n]* fail_for_invalid_at (yytext);
+\n        out_lineno++; ECHO;
+[^@\n]+           ECHO;
+
+<INITIAL><<EOF>> {
+  if (outname)
+    {
+      free (outname);
+      xfclose (yyout);
+    }
+  return EOF;

 }
 
 }
 

-<<EOF>> { /* End of file.  */
-  return 0;
+<SC_AT_DIRECTIVE_ARGS>{
+  [^@]+ { STRING_GROW; }
+
+  "@@" { obstack_1grow (&obstack_for_string, '@'); }
+  "@{" { obstack_1grow (&obstack_for_string, '['); }
+  "@}" { obstack_1grow (&obstack_for_string, ']'); }
+  "@`" /* Emtpy.  Useful for starting an argument
+          that begins with whitespace. */
+  @\n  /* Empty.  */
+
+  @[,)] {
+    if (at_directive_argc >= AT_DIRECTIVE_ARGC_MAX)
+      fail_for_at_directive_too_many_args (at_directive_argv[0]);
+
+    obstack_1grow (&obstack_for_string, '\0');
+    at_directive_argv[at_directive_argc++] =
+      obstack_finish (&obstack_for_string);
+
+    /* Like M4, skip whitespace after a comma.  */
+    if (yytext[1] == ',')
+      BEGIN SC_AT_DIRECTIVE_SKIP_WS;
+    else
+      {
+        at_directive_perform (at_directive_argc, at_directive_argv,
+                              &outname, &out_lineno);
+        obstack_free (&obstack_for_string, at_directive_argv[0]);
+        at_directive_argc = 0;
+        BEGIN INITIAL;
+      }
+  }
+
+  @.? { fail_for_invalid_at (yytext); }

 }
 
 }
 

-"\n" { /* End of line.  */
-  return '\n';
+<SC_AT_DIRECTIVE_SKIP_WS>{
+  [ \t\r\n]
+  . { yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; }

 }
 
 }
 

-. { /* Character.  */
-  yylval.character = *yytext;
-  return CHARACTER;
+<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>{
+  <<EOF>> {
+    fatal (_("unclosed %s directive in skeleton"), at_directive_argv[0]);
+  }

 }
 
 %%
 }
 
 %%

+
+/*------------------------.
+| Scan a Bison skeleton.  |
+`------------------------*/
+
+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 ();
+}
+
+void
+skel_scanner_free (void)
+{
+  obstack_free (&obstack_for_string, 0);
+  /* Reclaim Flex's buffers.  */
+  yylex_destroy ();
+}
+
+static
+void at_directive_perform (int at_directive_argc,
+                           char *at_directive_argv[],
+                           char **outnamep, int *out_linenop)
+{
+  if (0 == strcmp (at_directive_argv[0], "@basename"))
+    {
+      if (at_directive_argc > 2)
+        fail_for_at_directive_too_many_args (at_directive_argv[0]);
+      fputs (last_component (at_directive_argv[1]), yyout);
+    }
+  else if (0 == strcmp (at_directive_argv[0], "@warn")
+           || 0 == strcmp (at_directive_argv[0], "@complain")
+           || 0 == strcmp (at_directive_argv[0], "@fatal"))
+    {
+      void (*func)(char const *, ...);
+      switch (at_directive_argv[0][1])
+        {
+          case 'w': func = warn; break;
+          case 'c': func = complain; break;
+          case 'f': func = fatal; break;
+          default: aver (false); break;
+        }
+      switch (at_directive_argc)
+        {
+          case 2:
+            func (_(at_directive_argv[1]));
+            break;
+          case 3:
+            func (_(at_directive_argv[1]), at_directive_argv[2]);
+            break;
+          case 4:
+            func (_(at_directive_argv[1]), at_directive_argv[2],
+                  at_directive_argv[3]);
+            break;
+          case 5:
+            func (_(at_directive_argv[1]), at_directive_argv[2],
+                  at_directive_argv[3], at_directive_argv[4]);
+            break;
+          case 6:
+            func (_(at_directive_argv[1]), at_directive_argv[2],
+                  at_directive_argv[3], at_directive_argv[4],
+                  at_directive_argv[5]);
+            break;
+          default:
+            fail_for_at_directive_too_many_args (at_directive_argv[0]);
+            break;
+        }
+    }
+  else if (0 == strcmp (at_directive_argv[0], "@warn_at")
+           || 0 == strcmp (at_directive_argv[0], "@complain_at")
+           || 0 == strcmp (at_directive_argv[0], "@fatal_at"))
+    {
+      void (*func)(location, char const *, ...);
+      location loc;
+      if (at_directive_argc < 4)
+        fail_for_at_directive_too_few_args (at_directive_argv[0]);
+      switch (at_directive_argv[0][1])
+        {
+          case 'w': func = warn_at; break;
+          case 'c': func = complain_at; break;
+          case 'f': func = fatal_at; break;
+          default: aver (false); break;
+        }
+      boundary_set_from_string (&loc.start, at_directive_argv[1]);
+      boundary_set_from_string (&loc.end, at_directive_argv[2]);
+      switch (at_directive_argc)
+        {
+          case 4:
+            func (loc, _(at_directive_argv[3]));
+            break;
+          case 5:
+            func (loc, _(at_directive_argv[3]), at_directive_argv[4]);
+            break;
+          case 6:
+            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
+                  at_directive_argv[5]);
+            break;
+          case 7:
+            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
+                  at_directive_argv[5], at_directive_argv[6]);
+            break;
+          case 8:
+            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
+                  at_directive_argv[5], at_directive_argv[6],
+                  at_directive_argv[7]);
+            break;
+          default:
+            fail_for_at_directive_too_many_args (at_directive_argv[0]);
+            break;
+        }
+    }
+  else if (0 == strcmp (at_directive_argv[0], "@output"))
+    {
+      if (at_directive_argc > 2)
+        fail_for_at_directive_too_many_args (at_directive_argv[0]);
+      if (*outnamep)
+        {
+          free (*outnamep);
+          xfclose (yyout);
+        }
+      *outnamep = xstrdup (at_directive_argv[1]);
+      output_file_name_check (*outnamep);
+      yyout = xfopen (*outnamep, "w");
+      *out_linenop = 1;
+    }
+  else
+    fail_for_invalid_at (at_directive_argv[0]);
+}
+
+static void
+fail_for_at_directive_too_few_args (char const *at_directive_name)
+{
+  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)
+{
+  fatal (_("too many arguments for %s directive in skeleton"),
+         at_directive_name);
+}
+
+static void
+fail_for_invalid_at (char const *at)
+{
+  fatal ("invalid @ in skeleton: %s", at);
+}