brum.h

   1 /* cond.h */
   2 int yylex (void);
   3 void yyerror (char const *);
   4
   5 struct tree {
   6         enum {
   7                 ST_IF,
   8                 ST_COND,
   9                 ST_BLOCK,
  10                 ST_ASS,
  11                 ST_LEAF,
  12                 ST_EMPTY,
  13                 ST_ARROW,
  14                 ST_OP
  15         } st;   /* subtree type */
  16         union {
  17                 struct {
  18                         struct tree* c; /* condition */
  19                         struct tree* i; /* if */
  20                         struct tree* e; /* else */
  21                 } tif;
  22
  23                 struct {
  24                         int op;
  25                         struct tree* left;
  26                         struct tree* right;
  27                 } cond; /* binary operator */
  28
  29                 struct {
  30                         struct tree* head;
  31                         struct tree* tail;
  32                 } block;
  33
  34                 struct {
  35                         struct tree* left;
  36                         struct tree* right;
  37                 } ass;
  38
  39                 struct {
  40                         enum {
  41                                 L_VAR,
  42                                 L_CONST,
  43                                 L_NUM
  44                         } type;
  45                         union {
  46                                 char* s;
  47                                 int n;
  48                         } value;
  49                 } leaf;
  50
  51                 struct {
  52                         char* kw_left;
  53                         char* kw_right;
  54                         struct tree* s;
  55                 } arrow;
  56
  57                 struct {
  58                         int op;
  59                         struct tree* left;
  60                         struct tree* right;
  61                 } op;
  62
  63         } pt;
  64 };
  65
  66 struct tree* input_tree;
  67
  68 /* lex.c */
  69 void* xmalloc(size_t size);
  70 char* xstrdup(char* s);
  71 int line;
  72
  73 /* int.c */
  74 void print_tree(struct tree* t, int ind);
  75 void interp(struct tree* t);