src/cfg_parser.y

   1 /*--- cfg_parser.y -------------------------------------------------------------
   2 Copyright (C) 2004, 2005, 2006 Sylvain Fourmanoit <syfou@users.sourceforge.net>
   3
   4 Permission is hereby granted, free of charge, to any person obtaining a copy
   5 of this software and associated documentation files (the "Software"), to
   6 deal in the Software without restriction, including without limitation the
   7 rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   8 sell copies of the Software, and to permit persons to whom the Software is
   9 furnished to do so, subject to the following conditions:
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies of the Software and its documentation and acknowledgment shall be
  13 given in the documentation and software packages that this Software was
  14 used.
  15
  16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  20 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 ------------------------------------------------------------------------------*/
  23 /* Configuration file parser (bison)
  24 */
  25
  26 /*----------------------------------------------------------------------------*/
  27
  28 %{
  29   #include "cfgfile.h"                                  /* Configuration file
  30                                                            routines */
  31
  32   int cfglex(void);                                     /* Scanner exports */
  33   extern int cfg_lineno;
  34
  35   void cfgerror(char * str)                             /* Error message */
  36   {
  37     fprintf(stderr,
  38             "Configuration file parsing error `%s', stopped at line %d.\n",
  39             str, cfg_lineno);
  40   }
  41
  42   int cfgparse_alloc(void);                             /* Space allocation */
  43   cfgfile_item * cfg_item;                              /* Item reference
  44                                                            to be pushed back
  45                                                            on vector */
  46   vector * cfg_vec;                                     /* Callback vector */
  47
  48   #define CFG_ITEM_ALLOC \
  49   if(!cfg_item) if (!cfgparse_alloc()) {\
  50         cfgerror("memory allocation problem"); \
  51         YYABORT; \
  52   }
  53
  54 %}
  55
  56 /*----------------------------------------------------------------------------*/
  57 %union {
  58   int cfg_int;
  59   char cfg_char[256];
  60 }
  61
  62 %token <cfg_int> INTEGER
  63 %token <cfg_char> APPLET
  64 %token ID SCREEN X Y UNKNOWN
  65
  66 /*----------------------------------------------------------------------------*/
  67 %%
  68
  69 cfgfile: /* empty */ |
  70          cfgfile item
  71 ;
  72
  73 item:  APPLET body
  74         {
  75           strncpy(cfg_item->applet,$1,CFGFILE_NAME_SIZE-1);
  76           if (!vector_push(cfg_vec,cfg_item))
  77             YYABORT;
  78           cfg_item=NULL;
  79         }
  80 | UNKNOWN { cfgerror("unknown token encountered"); YYABORT; }
  81 ;
  82
  83 body: body_elem |
  84         body body_elem
  85 ;
  86
  87 body_elem:
  88         id_elem |
  89         screen_elem |
  90         x_elem |
  91         y_elem
  92 ;
  93
  94 id_elem: ID INTEGER
  95         {CFG_ITEM_ALLOC; cfg_item->id=$2;}
  96
  97 screen_elem: SCREEN INTEGER
  98         {CFG_ITEM_ALLOC; cfg_item->scr=$2;}
  99 ;
 100
 101 x_elem: X INTEGER
 102         {CFG_ITEM_ALLOC; cfg_item->x=$2;}
 103 ;
 104
 105 y_elem: Y INTEGER
 106         {CFG_ITEM_ALLOC; cfg_item->y=$2;}
 107 ;
 108
 109 %%
 110 /*----------------------------------------------------------------------------*/
 111 /* Instanciate a new item space
 112 */
 113 int
 114 cfgparse_alloc()
 115 {
 116   TRY_CATCH(cfg_item = malloc(sizeof(cfgfile_item)));
 117   cfg_item->applet[0]=0;
 118   cfg_item->id=0;
 119   cfg_item->scr=0;
 120   cfg_item->x=0;
 121   cfg_item->y=0;
 122   cfg_item->no_update=0;
 123   return 1;
 124 }
 125
 126 /*----------------------------------------------------------------------------*/
 127 /* Initialise external variables used by the parser
 128 */
 129 int
 130 cfgparse_init(vector * vec)
 131 {
 132   if (vec)
 133     cfg_vec=vec;
 134   cfg_item=NULL;
 135   return vec!=NULL;
 136 }