expr.h

   1 /*
   2  * Copyright 2005 Timo Hirvonen
   3  */
   4
   5 #ifndef EXPR_H
   6 #define EXPR_H
   7
   8 #include "track_info.h"
   9 #include "list.h"
  10
  11 enum { OP_LT, OP_LE, OP_EQ, OP_GE, OP_GT, OP_NE };
  12 #define NR_OPS (OP_NE + 1)
  13
  14 enum expr_type {
  15         EXPR_AND,
  16         EXPR_OR,
  17
  18         EXPR_NOT,
  19
  20         EXPR_STR,
  21         EXPR_INT,
  22         EXPR_BOOL
  23 };
  24 #define NR_EXPRS (EXPR_BOOL + 1)
  25
  26 struct expr {
  27         struct expr *left, *right, *parent;
  28         enum expr_type type;
  29         char *key;
  30         union {
  31                 struct {
  32                         struct list_head glob_head;
  33                         enum {
  34                                 SOP_EQ = OP_EQ,
  35                                 SOP_NE = OP_NE
  36                         } op;
  37                 } estr;
  38                 struct {
  39                         int val;
  40                         enum {
  41                                 IOP_LT = OP_LT,
  42                                 IOP_LE = OP_LE,
  43                                 IOP_EQ = OP_EQ,
  44                                 IOP_GE = OP_GE,
  45                                 IOP_GT = OP_GT,
  46                                 IOP_NE = OP_NE
  47                         } op;
  48                 } eint;
  49         };
  50 };
  51
  52 struct expr *expr_parse(const char *str);
  53 int expr_check_leaves(struct expr **exprp, const char *(*get_filter)(const char *name));
  54 int expr_eval(struct expr *expr, struct track_info *ti);
  55 void expr_free(struct expr *expr);
  56 const char *expr_error(void);
  57
  58 #endif