lib/sl/parse.y

   1 %{
   2 /*
   3  * Copyright (c) 1998 - 2000 Kungliga Tekniska Högskolan
   4  * (Royal Institute of Technology, Stockholm, Sweden).
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of the Institute nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "make_cmds.h"
  36 RCSID("$Id$");
  37
  38 static void yyerror (char *s);
  39
  40 struct string_list* append_string(struct string_list*, char*);
  41 void free_string_list(struct string_list *list);
  42 unsigned string_to_flag(const char *);
  43
  44 /* This is for bison */
  45
  46 #if !defined(alloca) && !defined(HAVE_ALLOCA)
  47 #define alloca(x) malloc(x)
  48 #endif
  49
  50 %}
  51
  52 %union {
  53   char *string;
  54   unsigned number;
  55   struct string_list *list;
  56 }
  57
  58 %token TABLE REQUEST UNKNOWN UNIMPLEMENTED END
  59 %token <string> STRING
  60 %type <number> flag flags
  61 %type <list> aliases
  62
  63 %%
  64
  65 file            : /* */
  66                 | statements
  67                 ;
  68
  69 statements      : statement
  70                 | statements statement
  71                 ;
  72
  73 statement       : TABLE STRING ';'
  74                 {
  75                     table_name = $2;
  76                 }
  77                 | REQUEST STRING ',' STRING ',' aliases ',' '(' flags ')' ';'
  78                 {
  79                     add_command($2, $4, $6, $9);
  80                 }
  81                 | REQUEST STRING ',' STRING ',' aliases ';'
  82                 {
  83                     add_command($2, $4, $6, 0);
  84                 }
  85                 | UNIMPLEMENTED STRING ',' STRING ',' aliases ';'
  86                 {
  87                     free($2);
  88                     free($4);
  89                     free_string_list($6);
  90                 }
  91                 | UNKNOWN aliases ';'
  92                 {
  93                     free_string_list($2);
  94                 }
  95                 | END ';'
  96                 {
  97                     YYACCEPT;
  98                 }
  99                 ;
 100
 101 aliases         : STRING
 102                 {
 103                     $$ = append_string(NULL, $1);
 104                 }
 105                 | aliases ',' STRING
 106                 {
 107                     $$ = append_string($1, $3);
 108                 }
 109                 ;
 110
 111 flags           : flag
 112                 {
 113                     $$ = $1;
 114                 }
 115                 | flags ',' flag
 116                 {
 117                     $$ = $1 | $3;
 118                 }
 119                 ;
 120 flag            : STRING
 121                 {
 122                     $$ = string_to_flag($1);
 123                     free($1);
 124                 }
 125                 ;
 126
 127
 128
 129 %%
 130
 131 static void
 132 yyerror (char *s)
 133 {
 134     error_message ("%s\n", s);
 135 }
 136
 137 struct string_list*
 138 append_string(struct string_list *list, char *str)
 139 {
 140     struct string_list *sl = malloc(sizeof(*sl));
 141     if (sl == NULL)
 142         return sl;
 143     sl->string = str;
 144     sl->next = NULL;
 145     if(list) {
 146         *list->tail = sl;
 147         list->tail = &sl->next;
 148         return list;
 149     }
 150     sl->tail = &sl->next;
 151     return sl;
 152 }
 153
 154 void
 155 free_string_list(struct string_list *list)
 156 {
 157     while(list) {
 158         struct string_list *sl = list->next;
 159         free(list->string);
 160         free(list);
 161         list = sl;
 162     }
 163 }
 164
 165 unsigned
 166 string_to_flag(const char *string)
 167 {
 168     return 0;
 169 }