Really add m4sugar to the repo.

[bison.git] / src / lex.c

diff --git a/src/lex.c b/src/lex.c
index b59793bcc18f72ca6f69e09536b9360a4ae0cf0a..489fdf9c3b62cdec7b11f41f46c441f85f6d06ff 100644 (file)
--- a/src/lex.c
+++ b/src/lex.c
@@ -1,5 +1,5 @@
 /* Token-reader for Bison's input parser,
 /* Token-reader for Bison's input parser,

-   Copyright (C) 1984, 1986, 1989, 1992, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1986, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.

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


@@ -18,89 +18,50 @@
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 

-
-/*
-   lex is the entry point.  It is called from reader.c.
-   It returns one of the token-type codes defined in lex.h.
-   When an identifier is seen, the code IDENTIFIER is returned
-   and the name is looked up in the symbol table using symtab.c;
-   symval is set to a pointer to the entry found.  */
-
-#include <stdio.h>

 #include "system.h"
 #include "system.h"

+#include "getargs.h"

 #include "files.h"
 #include "files.h"

-#include "getopt.h"            /* for optarg */

 #include "symtab.h"
 #include "symtab.h"

+#include "options.h"

 #include "lex.h"
 #include "lex.h"

-#include "alloc.h"

 #include "complain.h"
 #include "complain.h"

-
-/* flags set by % directives */
-extern int definesflag;        /* for -d */
-extern int toknumflag;         /* for -k */
-extern int noparserflag;       /* for -n */
-extern int fixed_outfiles;     /* for -y */
-extern int nolinesflag;        /* for -l */
-extern int rawtoknumflag;      /* for -r */
-extern int verboseflag;        /* for -v */
-extern int debugflag;                  /* for -t */
-extern char *spec_name_prefix;         /* for -p */
-extern char *spec_file_prefix; /* for -b */
-/*spec_outfile is declared in files.h, for -o */
-
-extern int translations;
-
-void init_lex PARAMS((void));
-char *grow_token_buffer PARAMS((char *));
-int skip_white_space PARAMS((void));
-int safegetc PARAMS((FILE *));
-int literalchar PARAMS((char **, int *, char));
-void unlex PARAMS((int));
-int lex PARAMS((void));
-int parse_percent_token PARAMS((void));
-
-/* functions from main.c */
-extern char *printable_version PARAMS((int));
+#include "gram.h"
+#include "quote.h"

 
 /* Buffer for storing the current token.  */
 
 /* Buffer for storing the current token.  */

-char *token_buffer;
+static struct obstack token_obstack;
+const char *token_buffer = NULL;

 
 

-/* Allocated size of token_buffer, not including space for terminator.  */
-int maxtoken;
-
-bucket *symval;
+bucket *symval = NULL;

 int numval;
 
 int numval;
 

-static int unlexed;            /* these two describe a token to be reread */
-static bucket *unlexed_symval; /* by the next call to lex */
-
+/* A token to be reread, see unlex and lex. */
+static token_t unlexed = tok_undef;
+static bucket *unlexed_symval = NULL;
+static const char *unlexed_token_buffer = NULL;

 
 void
 
 void

-init_lex (void)
+lex_init (void)

 {
 {

-  maxtoken = 100;
-  token_buffer = NEW2 (maxtoken + 1, char);
-  unlexed = -1;
+  obstack_init (&token_obstack);
+  unlexed = tok_undef;

 }
 
 
 }
 
 

-char *
-grow_token_buffer (char *p)
+void
+lex_free (void)

 {
 {

-  int offset = p - token_buffer;
-  maxtoken *= 2;
-  token_buffer = (char *) xrealloc(token_buffer, maxtoken + 1);
-  return token_buffer + offset;
+  obstack_free (&token_obstack, NULL);

 }
 
 
 int
 skip_white_space (void)
 {
 }
 
 
 int
 skip_white_space (void)
 {

-  register int c;
-  register int inside;
+  int c;
+  int inside;

 
 

-  c = getc(finput);
+  c = getc (finput);

 
   for (;;)
     {
 
   for (;;)
     {


@@ -109,7 +70,8 @@ skip_white_space (void)
       switch (c)
        {
        case '/':
       switch (c)
        {
        case '/':

-         c = getc(finput);
+         /* FIXME: Should probably be merged with copy_comment.  */
+         c = getc (finput);

          if (c != '*' && c != '/')
            {
              complain (_("unexpected `/' found and ignored"));
          if (c != '*' && c != '/')
            {
              complain (_("unexpected `/' found and ignored"));


@@ -117,7 +79,7 @@ skip_white_space (void)
            }
          cplus_comment = (c == '/');
 
            }
          cplus_comment = (c == '/');
 

-         c = getc(finput);
+         c = getc (finput);

 
          inside = 1;
          while (inside)
 
          inside = 1;
          while (inside)


@@ -125,12 +87,12 @@ skip_white_space (void)
              if (!cplus_comment && c == '*')
                {
                  while (c == '*')
              if (!cplus_comment && c == '*')
                {
                  while (c == '*')

-                   c = getc(finput);
+                   c = getc (finput);

 
                  if (c == '/')
                    {
                      inside = 0;
 
                  if (c == '/')
                    {
                      inside = 0;

-                     c = getc(finput);
+                     c = getc (finput);

                    }
                }
              else if (c == '\n')
                    }
                }
              else if (c == '\n')


@@ -138,12 +100,12 @@ skip_white_space (void)
                  lineno++;
                  if (cplus_comment)
                    inside = 0;
                  lineno++;
                  if (cplus_comment)
                    inside = 0;

-                 c = getc(finput);
+                 c = getc (finput);

                }
              else if (c == EOF)
                fatal (_("unterminated comment"));
              else
                }
              else if (c == EOF)
                fatal (_("unterminated comment"));
              else

-               c = getc(finput);
+               c = getc (finput);

            }
 
          break;
            }
 
          break;


@@ -154,7 +116,7 @@ skip_white_space (void)
        case ' ':
        case '\t':
        case '\f':
        case ' ':
        case '\t':
        case '\f':

-         c = getc(finput);
+         c = getc (finput);

          break;
 
        default:
          break;
 
        default:


@@ -163,465 +125,484 @@ skip_white_space (void)
     }
 }
 
     }
 }
 

-/* do a getc, but give error message if EOF encountered */
+
+/*-----------------------------------------------------.
+| Do a getc, but give error message if EOF encountered |
+`-----------------------------------------------------*/
+

 int
 int

-safegetc (FILE *f)
+xgetc (FILE *f)

 {
 {

-  register int c = getc(f);
+  int c = getc (f);

   if (c == EOF)
     fatal (_("unexpected end of file"));
   return c;
 }
 
   if (c == EOF)
     fatal (_("unexpected end of file"));
   return c;
 }
 

-/* read one literal character from finput.  process \ escapes.
-   append the normalized string version of the char to *pp.
-   assign the character code to *pcode
-   return 1 unless the character is an unescaped `term' or \n
-       report error for \n
-*/
-int
-literalchar (char **pp, int *pcode, char term)
+
+/*---------------------------------------------------------------.
+| Read one literal character from FINPUT, process \-escapes, and |
+| return the character.                                          |
+`---------------------------------------------------------------*/
+
+char
+literalchar (void)

 {
 {

-  register int c;
-  register char *p;
-  register int code;
-  int wasquote = 0;
+  int c;
+  int res;

 
 

-  c = safegetc(finput);
+  c = xgetc (finput);

   if (c == '\n')
     {
       complain (_("unescaped newline in constant"));
   if (c == '\n')
     {
       complain (_("unescaped newline in constant"));

-      ungetc(c, finput);
-      code = '?';
-      wasquote = 1;
+      ungetc (c, finput);
+      res = '?';

     }
   else if (c != '\\')
     {
     }
   else if (c != '\\')
     {

-      code = c;
-      if (c == term)
-       wasquote = 1;
+      res = c;

     }
   else
     {
     }
   else
     {

-      c = safegetc(finput);
-      if (c == 't')  code = '\t';
-      else if (c == 'n')  code = '\n';
-      else if (c == 'a')  code = '\007';
-      else if (c == 'r')  code = '\r';
-      else if (c == 'f')  code = '\f';
-      else if (c == 'b')  code = '\b';
-      else if (c == 'v')  code = '\013';
-      else if (c == '\\')  code = '\\';
-      else if (c == '\'')  code = '\'';
-      else if (c == '\"')  code = '\"';
+      c = xgetc (finput);
+      if (c == 't')
+       res = '\t';
+      else if (c == 'n')
+       res = '\n';
+      else if (c == 'a')
+       res = '\007';
+      else if (c == 'r')
+       res = '\r';
+      else if (c == 'f')
+       res = '\f';
+      else if (c == 'b')
+       res = '\b';
+      else if (c == 'v')
+       res = '\013';
+      else if (c == '\\')
+       res = '\\';
+      else if (c == '\'')
+       res = '\'';
+      else if (c == '\"')
+       res = '\"';

       else if (c <= '7' && c >= '0')
        {
       else if (c <= '7' && c >= '0')
        {

-         code = 0;
+         res = 0;

          while (c <= '7' && c >= '0')
            {
          while (c <= '7' && c >= '0')
            {

-             code = (code * 8) + (c - '0');
-             if (code >= 256 || code < 0)
+             res = (res * 8) + (c - '0');
+             if (res >= 256 || res < 0)

                {
                  complain (_("octal value outside range 0...255: `\\%o'"),
                {
                  complain (_("octal value outside range 0...255: `\\%o'"),

-                           code);
-                 code &= 0xFF;
+                           res);
+                 res &= 0xFF;

                  break;
                }
                  break;
                }

-             c = safegetc(finput);
+             c = xgetc (finput);

            }
            }

-         ungetc(c, finput);
+         ungetc (c, finput);

        }
       else if (c == 'x')
        {
        }
       else if (c == 'x')
        {

-         c = safegetc(finput);
-         code = 0;
+         c = xgetc (finput);
+         res = 0;

          while (1)
            {
              if (c >= '0' && c <= '9')
          while (1)
            {
              if (c >= '0' && c <= '9')

-               code *= 16,  code += c - '0';
+               res *= 16, res += c - '0';

              else if (c >= 'a' && c <= 'f')
              else if (c >= 'a' && c <= 'f')

-               code *= 16,  code += c - 'a' + 10;
+               res *= 16, res += c - 'a' + 10;

              else if (c >= 'A' && c <= 'F')
              else if (c >= 'A' && c <= 'F')

-               code *= 16,  code += c - 'A' + 10;
+               res *= 16, res += c - 'A' + 10;

              else
                break;
              else
                break;

-             if (code >= 256 || code<0)
+             if (res >= 256 || res < 0)

                {
                {

-                 complain (_("hexadecimal value above 255: `\\x%x'"),
-                           code);
-                 code &= 0xFF;
+                 complain (_("hexadecimal value above 255: `\\x%x'"), res);
+                 res &= 0xFF;

                  break;
                }
                  break;
                }

-             c = safegetc(finput);
+             c = xgetc (finput);

            }
            }

-         ungetc(c, finput);
+         ungetc (c, finput);

        }
       else
        {
        }
       else
        {

+         char badchar [] = "c";
+         badchar[0] = c;

          complain (_("unknown escape sequence: `\\' followed by `%s'"),
          complain (_("unknown escape sequence: `\\' followed by `%s'"),

-                   printable_version(c));
-         code = '?';
+                   quote (badchar));
+         res = '?';

        }
        }

-    } /* has \ */
-
-  /* now fill token_buffer with the canonical name for this character
-     as a literal token.  Do not use what the user typed,
-     so that `\012' and `\n' can be interchangeable.  */
-
-  p = *pp;
-  if (code == term && wasquote)
-    *p++ = code;
-  else if (code == '\\')  {*p++ = '\\'; *p++ = '\\';}
-  else if (code == '\'')  {*p++ = '\\'; *p++ = '\'';}
-  else if (code == '\"')  {*p++ = '\\'; *p++ = '\"';}
-  else if (code >= 040 && code < 0177)
-    *p++ = code;
-  else if (code == '\t')  {*p++ = '\\'; *p++ = 't';}
-  else if (code == '\n')  {*p++ = '\\'; *p++ = 'n';}
-  else if (code == '\r')  {*p++ = '\\'; *p++ = 'r';}
-  else if (code == '\v')  {*p++ = '\\'; *p++ = 'v';}
-  else if (code == '\b')  {*p++ = '\\'; *p++ = 'b';}
-  else if (code == '\f')  {*p++ = '\\'; *p++ = 'f';}
-  else
-    {
-      *p++ = '\\';
-      *p++ = code / 0100 + '0';
-      *p++ = ((code / 010) & 07) + '0';
-      *p++ = (code & 07) + '0';
-    }
-  *pp = p;
-  *pcode = code;
-  return  ! wasquote;
+    }                          /* has \ */
+
+  return res;

 }
 
 
 void
 }
 
 
 void

-unlex (int token)
+unlex (token_t token)

 {
   unlexed = token;
 {
   unlexed = token;

+  unlexed_token_buffer = token_buffer;

   unlexed_symval = symval;
 }
 
   unlexed_symval = symval;
 }
 

+/*-----------------------------------------------------------------.
+| We just read `<' from FIN.  Store in TOKEN_BUFFER, the type name |
+| specified between the `<...>'.                                   |
+`-----------------------------------------------------------------*/

 
 

-int
+void
+read_type_name (FILE *fin)
+{
+  int c = getc (fin);
+
+  while (c != '>')
+    {
+      if (c == EOF)
+       fatal (_("unterminated type name at end of file"));
+      if (c == '\n')
+       {
+         complain (_("unterminated type name"));
+         ungetc (c, fin);
+         break;
+       }
+
+      obstack_1grow (&token_obstack, c);
+      c = getc (fin);
+    }
+  obstack_1grow (&token_obstack, '\0');
+  token_buffer = obstack_finish (&token_obstack);
+}
+
+
+token_t

 lex (void)
 {
 lex (void)
 {

-  register int c;
-  char *p;
+  int c;
+
+  /* Just to make sure. */
+  token_buffer = NULL;

 
 

-  if (unlexed >= 0)
+  if (unlexed != tok_undef)

     {
     {

+      token_t res = unlexed;

       symval = unlexed_symval;
       symval = unlexed_symval;

-      c = unlexed;
-      unlexed = -1;
-      return c;
+      token_buffer = unlexed_token_buffer;
+      unlexed = tok_undef;
+      return res;

     }
 
     }
 

-  c = skip_white_space();
-  *token_buffer = c;   /* for error messages (token buffer always valid) */
-  token_buffer[1] = 0;
+  c = skip_white_space ();

 
   switch (c)
     {
     case EOF:
 
   switch (c)
     {
     case EOF:

-      strcpy(token_buffer, "EOF");
-      return ENDFILE;
-
-    case 'A':  case 'B':  case 'C':  case 'D':  case 'E':
-    case 'F':  case 'G':  case 'H':  case 'I':  case 'J':
-    case 'K':  case 'L':  case 'M':  case 'N':  case 'O':
-    case 'P':  case 'Q':  case 'R':  case 'S':  case 'T':
-    case 'U':  case 'V':  case 'W':  case 'X':  case 'Y':
+      token_buffer = "EOF";
+      return tok_eof;
+
+    case 'A':    case 'B':    case 'C':    case 'D':    case 'E':
+    case 'F':    case 'G':    case 'H':    case 'I':    case 'J':
+    case 'K':    case 'L':    case 'M':    case 'N':    case 'O':
+    case 'P':    case 'Q':    case 'R':    case 'S':    case 'T':
+    case 'U':    case 'V':    case 'W':    case 'X':    case 'Y':

     case 'Z':
     case 'Z':

-    case 'a':  case 'b':  case 'c':  case 'd':  case 'e':
-    case 'f':  case 'g':  case 'h':  case 'i':  case 'j':
-    case 'k':  case 'l':  case 'm':  case 'n':  case 'o':
-    case 'p':  case 'q':  case 'r':  case 's':  case 't':
-    case 'u':  case 'v':  case 'w':  case 'x':  case 'y':
+    case 'a':    case 'b':    case 'c':    case 'd':    case 'e':
+    case 'f':    case 'g':    case 'h':    case 'i':    case 'j':
+    case 'k':    case 'l':    case 'm':    case 'n':    case 'o':
+    case 'p':    case 'q':    case 'r':    case 's':    case 't':
+    case 'u':    case 'v':    case 'w':    case 'x':    case 'y':

     case 'z':
     case 'z':

-    case '.':  case '_':
-      p = token_buffer;
-      while (isalnum(c) || c == '_' || c == '.')
-       {
-         if (p == token_buffer + maxtoken)
-           p = grow_token_buffer(p);
+    case '.':    case '_':

 
 

-         *p++ = c;
-         c = getc(finput);
+      while (isalnum (c) || c == '_' || c == '.')
+       {
+         obstack_1grow (&token_obstack, c);
+         c = getc (finput);

        }
        }

-
-      *p = 0;
-      ungetc(c, finput);
-      symval = getsym(token_buffer);
-      return IDENTIFIER;
-
-    case '0':  case '1':  case '2':  case '3':  case '4':
-    case '5':  case '6':  case '7':  case '8':  case '9':
+      obstack_1grow (&token_obstack, '\0');
+      token_buffer = obstack_finish (&token_obstack);
+      ungetc (c, finput);
+      symval = getsym (token_buffer);
+      return tok_identifier;
+
+    case '0':    case '1':    case '2':    case '3':    case '4':
+    case '5':    case '6':    case '7':    case '8':    case '9':

       {
        numval = 0;
 
       {
        numval = 0;
 

-       p = token_buffer;
-       while (isdigit(c))
+       while (isdigit (c))

          {
          {

-           if (p == token_buffer + maxtoken)
-             p = grow_token_buffer(p);
-
-           *p++ = c;
-           numval = numval*10 + c - '0';
-           c = getc(finput);
+           obstack_1grow (&token_obstack, c);
+           numval = numval * 10 + c - '0';
+           c = getc (finput);

          }
          }

-       *p = 0;
-       ungetc(c, finput);
-       return NUMBER;
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);
+       ungetc (c, finput);
+       return tok_number;

       }
 
     case '\'':
       }
 
     case '\'':

-

       /* parse the literal token and compute character code in  code  */
 
       /* parse the literal token and compute character code in  code  */
 

-      translations = -1;

       {
       {

-       int code, discode;
-       char discard[10], *dp;
+       int code = literalchar ();

 
 

-       p = token_buffer;
-       *p++ = '\'';
-       literalchar(&p, &code, '\'');
+       obstack_1grow (&token_obstack, '\'');
+       obstack_1grow (&token_obstack, code);

 
 

-       c = getc(finput);
+       c = getc (finput);

        if (c != '\'')
          {
            complain (_("use \"...\" for multi-character literal tokens"));
        if (c != '\'')
          {
            complain (_("use \"...\" for multi-character literal tokens"));

-           while (1)
-             {
-               dp = discard;
-               if (! literalchar(&dp, &discode, '\''))
-                 break;
-             }
+           while (literalchar () != '\'')
+             /* Skip. */;

          }
          }

-       *p++ = '\'';
-       *p = 0;
-       symval = getsym(token_buffer);
-       symval->class = STOKEN;
-       if (! symval->user_token_number)
+       obstack_1grow (&token_obstack, '\'');
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);
+       symval = getsym (token_buffer);
+       symval->class = token_sym;
+       if (symval->user_token_number == SUNDEF)

          symval->user_token_number = code;
          symval->user_token_number = code;

-       return IDENTIFIER;
+       return tok_identifier;

       }
 
     case '\"':
       }
 
     case '\"':

-

       /* parse the literal string token and treat as an identifier */
 
       /* parse the literal string token and treat as an identifier */
 

-      translations = -1;

       {
       {

-       int code;       /* ignored here */
-       p = token_buffer;
-       *p++ = '\"';
-       while (literalchar(&p, &code, '\"'))  /* read up to and including " */
+       int code;               /* ignored here */
+
+       obstack_1grow (&token_obstack, '\"');
+       /* Read up to and including ".  */
+       do

          {
          {

-           if (p >= token_buffer + maxtoken - 4)
-             p = grow_token_buffer(p);
+           code = literalchar ();
+           obstack_1grow (&token_obstack, code);

          }
          }

-       *p = 0;
+       while (code != '\"');
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);

 
 

-       symval = getsym(token_buffer);
-       symval->class = STOKEN;
+       symval = getsym (token_buffer);
+       symval->class = token_sym;

 
 

-       return IDENTIFIER;
+       return tok_identifier;

       }
 
     case ',':
       }
 
     case ',':

-      return COMMA;
+      token_buffer = ",";
+      return tok_comma;

 
     case ':':
 
     case ':':

-      return COLON;
+      token_buffer = ":";
+      return tok_colon;

 
     case ';':
 
     case ';':

-      return SEMICOLON;
+      token_buffer = ";";
+      return tok_semicolon;

 
     case '|':
 
     case '|':

-      return BAR;
+      token_buffer = "|";
+      return tok_bar;

 
     case '{':
 
     case '{':

-      return LEFT_CURLY;
+      token_buffer = "{";
+      return tok_left_curly;

 
     case '=':
 
     case '=':

+      obstack_1grow (&token_obstack, c);

       do
        {
       do
        {

-         c = getc(finput);
-         if (c == '\n') lineno++;
+         c = getc (finput);
+         obstack_1grow (&token_obstack, c);
+         if (c == '\n')
+           lineno++;

        }
        }

-      while(c==' ' || c=='\n' || c=='\t');
+      while (c == ' ' || c == '\n' || c == '\t');
+      obstack_1grow (&token_obstack, '\0');
+      token_buffer = obstack_finish (&token_obstack);

 
       if (c == '{')
        {
 
       if (c == '{')
        {

-         strcpy(token_buffer, "={");
-         return LEFT_CURLY;
+         return tok_left_curly;

        }
       else
        {
        }
       else
        {

-         ungetc(c, finput);
-         return ILLEGAL;
+         ungetc (c, finput);
+         return tok_illegal;

        }
 
     case '<':
        }
 
     case '<':

-      p = token_buffer;
-      c = getc(finput);
-      while (c != '>')
-       {
-         if (c == EOF)
-           fatal (_("unterminated type name at end of file"));
-         if (c == '\n')
-           {
-             complain (_("unterminated type name"));
-             ungetc(c, finput);
-             break;
-           }
-
-         if (p == token_buffer + maxtoken)
-           p = grow_token_buffer(p);
-
-         *p++ = c;
-         c = getc(finput);
-       }
-      *p = 0;
-      return TYPENAME;
-
+      read_type_name (finput);
+      return tok_typename;

 
     case '%':
 
     case '%':

-      return parse_percent_token();
+      return parse_percent_token ();

 
     default:
 
     default:

-      return ILLEGAL;
+      obstack_1grow (&token_obstack, c);
+      obstack_1grow (&token_obstack, '\0');
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_illegal;

     }
 }
 
     }
 }
 

-/* the following table dictates the action taken for the various
-       % directives.  A setflag value causes the named flag to be
-       set.  A retval action returns the code.
-*/
-struct percent_table_struct {
-       char *name;
-       void *setflag;
-       int retval;
-} percent_table[] =
+/* This function is a strcmp, which doesn't differentiate `-' and `_'
+   chars.  */
+
+static int
+option_strcmp (const char *left, const char *right)

 {
 {

-  {"token", NULL, TOKEN},
-  {"term", NULL, TOKEN},
-  {"nterm", NULL, NTERM},
-  {"type", NULL, TYPE},
-  {"guard", NULL, GUARD},
-  {"union", NULL, UNION},
-  {"expect", NULL, EXPECT},
-  {"thong", NULL, THONG},
-  {"start", NULL, START},
-  {"left", NULL, LEFT},
-  {"right", NULL, RIGHT},
-  {"nonassoc", NULL, NONASSOC},
-  {"binary", NULL, NONASSOC},
-  {"semantic_parser", NULL, SEMANTIC_PARSER},
-  {"pure_parser", NULL, PURE_PARSER},
-  {"prec", NULL, PREC},
-
-  {"no_lines", &nolinesflag, NOOP}, /* -l */
-  {"raw", &rawtoknumflag, NOOP}, /* -r */
-  {"token_table", &toknumflag, NOOP}, /* -k */
-
-#if 0
-  /* These can be utilized after main is reoganized so
-     open_files() is deferred 'til after read_declarations().
-     But %{ and %union both put information into files
-     that have to be opened before read_declarations().
-     */
-  {"yacc", &fixed_outfiles, NOOP}, /* -y */
-  {"fixed_output_files", &fixed_outfiles, NOOP}, /* -y */
-  {"defines", &definesflag, NOOP}, /* -d */
-  {"no_parser", &noparserflag, NOOP}, /* -n */
-  {"output_file", &spec_outfile, SETOPT}, /* -o */
-  {"file_prefix", &spec_file_prefix, SETOPT}, /* -b */
-  {"name_prefix", &spec_name_prefix, SETOPT}, /* -p */
-
-  /* These would be acceptable, but they do not affect processing */
-  {"verbose", &verboseflag, NOOP}, /* -v */
-  {"debug", &debugflag, NOOP}, /* -t */
-  /*   {"help", <print usage stmt>, NOOP},*/   /* -h */
-  /*   {"version", <print version number> ,  NOOP},*/  /* -V */
-#endif
-
-  {NULL, NULL, ILLEGAL}
-};
+  const unsigned char *l, *r;
+  int c;
+
+  assert (left);
+  assert (right);
+  l = (const unsigned char *)left;
+  r = (const unsigned char *)right;
+  while (((c = *l - *r++) == 0 && *l != '\0')
+        || ((*l == '-' || *l == '_') && (*r == '_' || *r == '-')))
+    l++;
+  return c;
+}

 
 /* Parse a token which starts with %.
    Assumes the % has already been read and discarded.  */
 
 
 /* Parse a token which starts with %.
    Assumes the % has already been read and discarded.  */
 

-int
+token_t

 parse_percent_token (void)
 {
 parse_percent_token (void)
 {

-  register int c;
-  register char *p;
-  register struct percent_table_struct *tx;
+  const struct option_table_struct *tx = NULL;
+  const char *arg = NULL;
+  /* Where the ARG was found in token_buffer. */
+  size_t arg_offset = 0;

 
 

-  p = token_buffer;
-  c = getc(finput);
-  *p++ = '%';
-  *p++ = c;    /* for error msg */
-  *p = 0;
+  int c = getc (finput);
+  obstack_1grow (&token_obstack, '%');
+  obstack_1grow (&token_obstack, c);

 
   switch (c)
     {
     case '%':
 
   switch (c)
     {
     case '%':

-      return TWO_PERCENTS;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_two_percents;

 
     case '{':
 
     case '{':

-      return PERCENT_LEFT_CURLY;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_percent_left_curly;

 
 

+      /* The following guys are here for backward compatibility with
+        very ancient Yacc versions.  The paper of Johnson mentions
+        them (as ancient :).  */

     case '<':
     case '<':

-      return LEFT;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_left;

 
     case '>':
 
     case '>':

-      return RIGHT;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_right;

 
     case '2':
 
     case '2':

-      return NONASSOC;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_nonassoc;

 
     case '0':
 
     case '0':

-      return TOKEN;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_token;

 
     case '=':
 
     case '=':

-      return PREC;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_prec;

     }
     }

-  if (!isalpha(c))
-    return ILLEGAL;

 
 

-  p = token_buffer;
-  *p++ = '%';
-  while (isalpha(c) || c == '_' || c == '-')
+  if (!isalpha (c))

     {
     {

-      if (p == token_buffer + maxtoken)
-       p = grow_token_buffer(p);
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_illegal;
+    }

 
 

-      if (c == '-') c = '_';
-      *p++ = c;
-      c = getc(finput);
+  while (c = getc (finput), isalpha (c) || c == '_' || c == '-')
+    {
+      if (c == '_')
+       c = '-';
+      obstack_1grow (&token_obstack, c);

     }
 
     }
 

-  ungetc(c, finput);
+  /* %DIRECTIVE="ARG".  Separate into
+     TOKEN_BUFFER = `%DIRECTIVE\0ARG\0'.
+     This is a bit hackish, but once we move to a Bison parser,
+     things will be cleaned up.  */
+  if (c == '=')
+    {
+      /* End of the directive.  We skip the `='. */
+      obstack_1grow (&token_obstack, '\0');
+      /* Fetch the ARG if present. */
+      c = getc (finput);
+      if (c == '"')
+       {
+         int code;
+         arg_offset = obstack_object_size (&token_obstack);
+         /* Read up to and including `"'.  Do not append the closing
+            `"' in the output: it's not part of the ARG.  */
+         while ((code = literalchar ()) != '"')
+           obstack_1grow (&token_obstack, code);
+       }
+      /* else: should be an error. */
+    }
+  else
+    ungetc (c, finput);

 
 

-  *p = 0;
+  obstack_1grow (&token_obstack, '\0');
+  token_buffer = obstack_finish (&token_obstack);
+  if (arg_offset)
+    arg = token_buffer + arg_offset;

 
   /* table lookup % directive */
 
   /* table lookup % directive */

-  for (tx = percent_table; tx->name; tx++)
-    if (strcmp(token_buffer+1, tx->name) == 0)
+  for (tx = option_table; tx->name; tx++)
+    if ((tx->access == opt_percent || tx->access == opt_both)
+       && option_strcmp (token_buffer + 1, tx->name) == 0)

       break;
       break;

-  if (tx->retval == SETOPT)
-    {
-      *((char **)(tx->setflag)) = optarg;
-      return NOOP;
-    }
-  if (tx->setflag)
+
+  if (arg && tx->ret_val != tok_stropt)
+    fatal (_("`%s' supports no argument: %s"), token_buffer, quote (arg));
+
+
+  switch (tx->ret_val)

     {
     {

-      *((int *)(tx->setflag)) = 1;
-      return NOOP;
+    case tok_stropt:
+      assert (tx->set_flag);
+      if (arg)
+       {
+         /* Keep only the first assignment: command line options have
+            already been processed, and we want them to have
+            precedence.  Side effect: if this %-option is used
+            several times, only the first is honored.  Bah.  */
+         if (!*((char **) (tx->set_flag)))
+           *((char **) (tx->set_flag)) = xstrdup (arg);
+       }
+      else
+       fatal (_("`%s' requires an argument"), token_buffer);
+      return tok_noop;
+      break;
+
+    case tok_intopt:
+      assert (tx->set_flag);
+      *((int *) (tx->set_flag)) = 1;
+      return tok_noop;
+      break;
+
+    case tok_obsolete:
+      fatal (_("`%s' is no longer supported"), token_buffer);
+      return tok_noop;
+      break;
+
+    default:
+      return tx->ret_val;
+      break;

     }
     }

-  return tx->retval;
+  abort ();

 }
 }