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 lr.type ielr
  37 %define api.pure full
  38 %define api.push-pull push
  39 %parse-param {yycstate* cs}
  40 %union {
  41   long long  ref;
  42   int        val;
  43   apc_facing  face;
  44   uint8_t*   str;
  45   ir_class   class;
  46   ir_set     set;
  47   ir_setld   ld;
  48   ir_setdata data;
  49   struct frame_spec_t frame_spec;
  50 }
  51 /* Operators */
  52 %token        CLOPEN    //(
  53 %token        CLCLOSE   //)
  54 %token        MAP       //~
  55 %token        AUDIO     //AUDIO
  56 %token        SS        //SS
  57 %token        LINK      //#
  58 /* Terminals */
  59 %token <val>  NUM
  60 %token <str>  PATH
  61 %token <ref>  REF
  62 %token <face> FACING
  63 %token <str>  NAME
  64 /* Types */
  65 %type<data>       data_spec
  66 %type<set>        set_spec
  67 %type<ld>         set_ld set_link
  68 %type<frame_spec> frame_spec
  69 %%
  70 /* Syntax Directed Translation Scheme of the APC grammar */
  71 progn:
  72   class_list
  73 | class_list statement_list
  74 | statement_list
  75 ;
  76
  77 class_list:
  78   class_list class
  79 | class
  80 ;
  81
  82 class:
  83   NAME CLOPEN   { yyclass_push(cs,ir_class_addchild(yyclass(cs), $1)); }
  84   progn
  85   CLCLOSE       { yyclass_pop(cs); }
  86 ;
  87
  88 statement_list:
  89   statement_list statement
  90 | statement
  91 ;
  92
  93 statement:
  94   set_spec data_spec REF PATH { ir_data_assign_path($2,$4); ir_set_assign_data($1,$2); ir_set_assign_ref($1,$3); }
  95 | set_spec data_spec PATH     { ir_data_assign_path($2,$3); ir_set_assign_data($1,$2); }
  96 | set_spec REF PATH           { ir_set_assign_ref($1,$2); }
  97 ;
  98
  99 data_spec:
 100   SS NAME frame_spec     { $$ = ir_framesheet($2,$3.d,$3.w,$3.h); }
 101 | MAP NAME frame_spec    { $$ = ir_mapsheet($2,$3.d,$3.w,$3.h); }
 102 | AUDIO NAME             { $$ = ir_audio($2); }
 103 | LINK set_ld            { $$ = ir_link(OLINK, $2, NULL); }
 104 | LINK set_ld MAP        { $$ = ir_link(MLINK, $2,NULL); }
 105 | LINK set_ld MAP NAME   { $$ = ir_link(MLINK, $2,$4); }
 106 | LINK set_ld SS         { $$ = ir_link(VLINK, $2,NULL); }
 107 | LINK set_ld SS NAME    { $$ = ir_link(VLINK, $2,$4); }
 108 | LINK set_ld AUDIO      { $$ = ir_link(ALINK, $2,NULL); }
 109 | LINK set_ld AUDIO NAME { $$ = ir_link(ALINK, $2,$4); }
 110 ;
 111
 112 set_spec:
 113   set_spec NAME          { $$ = ir_set_addchild($1,$2); }
 114 | NAME                   { $$ = ir_class_addset(yyclass(cs),$1); }
 115 ;
 116
 117 set_link:
 118   set_link NAME          { $$ = ir_setld_addchild($1,$2); }
 119 | NAME                   { $$ = ir_setld_from_classld(yyclassld(cs),$1); }
 120 ;
 121
 122 set_ld:
 123   set_link               { $$ = $1; }
 124 | REF                    { $$ = ir_setld_from_ref($1); }
 125 ;
 126
 127 frame_spec:
 128   NUM NUM                { $$ = (struct frame_spec_t) {SFACE,$1,$2}; }
 129 | FACING                 { $$ = (struct frame_spec_t) {$1,0,0}; }
 130 | FACING NUM NUM         { $$ = (struct frame_spec_t) {$1,$2,$3}; }
 131 ;
 132
 133 %%
 134
 135 static
 136 void yyerror
 137 ( yycstate* cs,
 138   char const *s
 139 )
 140 { fprintf(stderr, "%s\n", s); }
 141
 142 yycstate* yycstate_new
 143 ( void )
 144 { yycstate* class_state;
 145   class_state = (yycstate*) malloc((size_t) sys_pagesize);
 146   if(class_state == NULL)
 147     { yyerror(class_state, "Memory allocation error.");
 148       return NULL;
 149     }
 150   class_state->csp = class_state->class_stack;
 151   *(class_state->csp) = ir_class_root();
 152   return class_state;
 153 }
 154
 155 static inline
 156 ir_class yyclass_pop
 157 ( yycstate* cs )
 158 { return *((cs->csp)--); }
 159
 160 static inline
 161 ir_class yyclass_push
 162 ( yycstate* cs,
 163   ir_class class
 164 )
 165 { return *++(cs->csp) = class; }
 166
 167 void yycstate_delete
 168 ( yycstate* class_state )
 169 { free(class_state); }