src/parser.y

   1 /* Asset Package Compiler */
   2
   3 %code requires {
   4   #include <unitypes.h>
   5   #include "ir.h"
   6   #include "apc.h"
   7   typedef struct class_state_t yycstate;
   8   struct frame_spec_t { apc_facing d; int w, h; };
   9 }
  10 %code provides {
  11   yycstate* yycstate_new(void);
  12   void      yycstate_delete(yycstate*);
  13 }
  14 %code {
  15   #include <stdio.h>
  16   #include <string.h>
  17   #include <dirent.h>
  18   #include <unitypes.h>
  19   #include "ir.h"
  20
  21   struct class_state_t {
  22     ir_class *csp;
  23     ir_class class_stack[];
  24   };
  25
  26   extern long     sys_pagesize;
  27   extern int      lexer();
  28   static void     yyerror(yycstate*, char const*);
  29   static inline ir_class yyclass_push(yycstate*, ir_class);
  30   static inline ir_class yyclass_pop(yycstate*);
  31   /* Stack-based class handler */
  32   #define yyclass(CS)   (*(CS->csp))
  33   #define yyclassld(CS) (ir_classld_from_class(yyclass(CS)))
  34 }
  35 %define parse.error verbose
  36 %define parse.lac full
  37 %define lr.type ielr
  38 %define api.pure full
  39 %define api.push-pull push
  40 %parse-param {yycstate* cs}
  41 %union {
  42   long long  ref;
  43   int        val;
  44   apc_facing  face;
  45   uint8_t*   str;
  46   ir_class   class;
  47   ir_set     set;
  48   ir_setld   ld;
  49   ir_setdata data;
  50   struct frame_spec_t frame_spec;
  51 }
  52 /* Operators */
  53 %token        CLOPEN    //(
  54 %token        CLCLOSE   //)
  55 %token        MAP       //~
  56 %token        AUDIO     //AUDIO
  57 %token        SS        //SS
  58 %token        LINK      //#
  59 /* Terminals */
  60 %token <val>  NUM
  61 %token <str>  PATH
  62 %token <ref>  REF
  63 %token <face> FACING
  64 %token <str>  NAME
  65 /* Types */
  66 %type<data>       data_spec
  67 %type<set>        set_spec
  68 %type<ld>         set_ld set_link
  69 %type<frame_spec> frame_spec
  70 %%
  71 /* Syntax Directed Translation Scheme of the APC grammar */
  72 progn:
  73   class_list
  74 | class_list statement_list
  75 | statement_list
  76 ;
  77
  78 class_list:
  79   class_list class
  80 | class
  81 ;
  82
  83 class:
  84   NAME CLOPEN   { yyclass_push(cs,ir_class_addchild(yyclass(cs), $1)); }
  85   progn
  86   CLCLOSE       { yyclass_pop(cs); }
  87 ;
  88
  89 statement_list:
  90   statement_list statement
  91 | statement
  92 ;
  93
  94 statement:
  95   set_spec data_spec REF PATH { ir_data_assign_path($2,$4); ir_set_assign_data($1,$2); ir_set_assign_ref($1,$3); }
  96 | set_spec data_spec PATH     { ir_data_assign_path($2,$3); ir_set_assign_data($1,$2); }
  97 | set_spec REF PATH           { ir_set_assign_ref($1,$2); }
  98 ;
  99
 100 data_spec:
 101   SS NAME frame_spec     { $$ = ir_framesheet($2,$3.d,$3.w,$3.h); }
 102 | MAP NAME frame_spec    { $$ = ir_mapsheet($2,$3.d,$3.w,$3.h); }
 103 | AUDIO NAME             { $$ = ir_audio($2); }
 104 | LINK set_ld            { $$ = ir_link(OLINK, $2, NULL); }
 105 | LINK set_ld MAP        { $$ = ir_link(MLINK, $2,NULL); }
 106 | LINK set_ld MAP NAME   { $$ = ir_link(MLINK, $2,$4); }
 107 | LINK set_ld SS         { $$ = ir_link(VLINK, $2,NULL); }
 108 | LINK set_ld SS NAME    { $$ = ir_link(VLINK, $2,$4); }
 109 | LINK set_ld AUDIO      { $$ = ir_link(ALINK, $2,NULL); }
 110 | LINK set_ld AUDIO NAME { $$ = ir_link(ALINK, $2,$4); }
 111 ;
 112
 113 set_spec:
 114   set_spec NAME          { $$ = ir_set_addchild($1,$2); }
 115 | NAME                   { $$ = ir_class_addset(yyclass(cs),$1); }
 116 ;
 117
 118 set_link:
 119   set_link NAME          { $$ = ir_setld_addchild($1,$2); }
 120 | NAME                   { $$ = ir_setld_from_classld(yyclassld(cs),$1); }
 121 ;
 122
 123 set_ld:
 124   set_link               { $$ = $1; }
 125 | REF                    { $$ = ir_setld_from_ref($1); }
 126 ;
 127
 128 frame_spec:
 129   NUM NUM                { $$ = (struct frame_spec_t) {SFACE,$1,$2}; }
 130 | FACING                 { $$ = (struct frame_spec_t) {$1,0,0}; }
 131 | FACING NUM NUM         { $$ = (struct frame_spec_t) {$1,$2,$3}; }
 132 ;
 133
 134 %%
 135
 136 static
 137 void yyerror
 138 ( yycstate* cs,
 139   char const *s
 140 )
 141 { ir_class* iter;
 142   for (iter = cs->class_stack; iter < cs->csp; iter++)
 143     fprintf(stderr, "%s/", ir_class_name(*iter));
 144   fprintf(stderr, "\n\t");
 145   fprintf(stderr, "%s\n", s);
 146 }
 147
 148 yycstate* yycstate_new
 149 ( void )
 150 { yycstate* class_state;
 151   class_state = (yycstate*) malloc((size_t) sys_pagesize);
 152   if(class_state == NULL)
 153     { yyerror(class_state, "Memory allocation error.");
 154       return NULL;
 155     }
 156   class_state->csp = class_state->class_stack;
 157   *(class_state->csp) = ir_class_root();
 158   return class_state;
 159 }
 160
 161 static inline
 162 ir_class yyclass_pop
 163 ( yycstate* cs )
 164 { cs->csp--;
 165   return *(cs->csp + 1);
 166 }
 167
 168 static inline
 169 ir_class yyclass_push
 170 ( yycstate* cs,
 171   ir_class class
 172 )
 173 { return *++(cs->csp) = class; }
 174
 175 void yycstate_delete
 176 ( yycstate* class_state )
 177 { free(class_state); }