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   #define DEFAULT_VARIANT (uint8_t*)"default"
  35 }
  36 %define parse.error verbose
  37 %define parse.lac full
  38 %define lr.type ielr
  39 %define api.pure full
  40 %define api.push-pull push
  41 %parse-param {yycstate* cs}
  42 %union {
  43   uint32_t   ref;
  44   int        val;
  45   apc_facing face;
  46   uint8_t*   str;
  47   ir_class   class;
  48   ir_set     set;
  49   ir_setld   ld;
  50   ir_setdata data;
  51   struct frame_spec_t frame_spec;
  52 }
  53 /* Operators */
  54 %token        CLOPEN    //(
  55 %token        CLCLOSE   //)
  56 %token        MAP       //~
  57 %token        AUDIO     //AUDIO
  58 %token        SS        //SS
  59 %token        LINK      //#
  60 /* Terminals */
  61 %token <val>  NUM
  62 %token <str>  PATH
  63 %token <ref>  REF
  64 %token <face> FACING
  65 %token <str>  NAME
  66 /* Types */
  67 %type<data>       data_spec
  68 %type<set>        set_spec
  69 %type<ld>         set_ld set_link
  70 %type<frame_spec> frame_spec
  71 %%
  72 /* Syntax Directed Translation Scheme of the APC grammar */
  73 progn:
  74   class_list
  75 | class_list statement_list
  76 | statement_list class_list
  77 | statement_list
  78 ;
  79
  80 class_list:
  81   class_list class
  82 | class
  83 ;
  84
  85 class:
  86   NAME CLOPEN   { yyclass_push(cs,ir_class_addchild(yyclass(cs), $1)); }
  87   progn
  88   CLCLOSE       { yyclass_pop(cs); }
  89 ;
  90
  91 statement_list:
  92   statement_list statement
  93 | statement
  94 ;
  95
  96    statement:
  97   set_spec data_spec REF PATH { ir_data_assign_path($2,$4); ir_set_assign_data($1,$2); ir_set_assign_ref($1,$3); }
  98 | set_spec data_spec PATH     { ir_data_assign_path($2,$3); ir_set_assign_data($1,$2); }
  99 | set_spec REF PATH           { ir_set_assign_ref($1,$2); }
 100 ;
 101
 102 data_spec:
 103   SS NAME frame_spec     { $$ = ir_framesheet($2,$3.d,$3.w,$3.h); }
 104 | SS frame_spec          { $$ = ir_framesheet(DEFAULT_VARIANT,$2.d,$2.w,$2.h); }
 105 | MAP NAME frame_spec    { $$ = ir_mapsheet($2,$3.d,$3.w,$3.h); }
 106 | MAP frame_spec         { $$ = ir_mapsheet(DEFAULT_VARIANT,$2.d,$2.w,$2.h); }
 107 | AUDIO NAME             { $$ = ir_audio($2); }
 108 | LINK set_ld            { $$ = ir_link(OLINK, $2, NULL); }
 109 | LINK set_ld MAP        { $$ = ir_link(MLINK, $2,NULL); }
 110 | LINK set_ld MAP NAME   { $$ = ir_link(MLINK, $2,$4); }
 111 | LINK set_ld SS         { $$ = ir_link(VLINK, $2,NULL); }
 112 | LINK set_ld SS NAME    { $$ = ir_link(VLINK, $2,$4); }
 113 | LINK set_ld AUDIO      { $$ = ir_link(ALINK, $2,NULL); }
 114 | LINK set_ld AUDIO NAME { $$ = ir_link(ALINK, $2,$4); }
 115 ;
 116
 117 set_spec:
 118   set_spec NAME          { $$ = ir_set_addchild($1,$2); }
 119 | NAME                   { $$ = ir_class_addset(yyclass(cs),$1); }
 120 ;
 121
 122 set_link:
 123   set_link NAME          { $$ = ir_setld_addchild($1,$2); }
 124 | NAME                   { $$ = ir_setld_from_classld(yyclassld(cs),$1); }
 125 ;
 126
 127 set_ld:
 128   set_link               { $$ = $1; }
 129 | REF                    { $$ = ir_setld_from_ref($1); }
 130 ;
 131
 132 frame_spec:
 133   NUM NUM                { $$ = (struct frame_spec_t) {SFACE,$1,$2}; }
 134 | FACING                 { $$ = (struct frame_spec_t) {$1,0,0}; }
 135 | FACING NUM NUM         { $$ = (struct frame_spec_t) {$1,$2,$3}; }
 136 | %empty                 { $$ = (struct frame_spec_t) {SFACE,0,0}; }
 137 ;
 138
 139 %%
 140
 141 static
 142 void yyerror
 143 ( yycstate* cs,
 144   char const *s
 145 )
 146 { ir_class* iter;
 147   fprintf(stderr, "[class->");
 148   for (iter = cs->class_stack; iter <= cs->csp; iter++)
 149     fprintf(stderr, "%s/", ir_class_name(*iter));
 150   if (strstr(s,"unexpected CLCLOSE") != NULL)
 151     yyclass_pop(cs);
 152   fprintf(stderr, "]\n\t");
 153   fprintf(stderr, "%s\n", s);
 154 }
 155
 156 yycstate* yycstate_new
 157 ( void )
 158 { yycstate* class_state;
 159   class_state = (yycstate*) malloc((size_t) sys_pagesize);
 160   if(class_state == NULL)
 161     { yyerror(class_state, "Memory allocation error.");
 162       return NULL;
 163     }
 164   class_state->csp = class_state->class_stack;
 165   *(class_state->csp) = ir_class_root();
 166   return class_state;
 167 }
 168
 169 static inline
 170 ir_class yyclass_pop
 171 ( yycstate* cs )
 172 { return *cs->csp--; }
 173
 174 static inline
 175 ir_class yyclass_push
 176 ( yycstate* cs,
 177   ir_class class
 178 )
 179 { return *++(cs->csp) = class; }
 180
 181 void yycstate_delete
 182 ( yycstate* class_state )
 183 { free(class_state); }