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334
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1 /*
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2 lwexpr.h
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #ifndef ___lw_expr_h_seen___
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23 #define ___lw_expr_h_seen___
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24
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25
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26 enum
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27 {
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28 lw_expr_type_oper, // operator term
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29 lw_expr_type_int, // integer
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30 lw_expr_type_var, // a "variable" (string for the name)
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31 lw_expr_type_special // a "special" reference (user defined)
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32 };
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33
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34 enum
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35 {
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36 lw_expr_oper_plus = 1, // addition
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37 lw_expr_oper_minus, // subtraction
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38 lw_expr_oper_times, // multiplication
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39 lw_expr_oper_divide, // division
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40 lw_expr_oper_mod, // modulus
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41 lw_expr_oper_intdiv, // integer division
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42 lw_expr_oper_bwand, // bitwise and
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43 lw_expr_oper_bwor, // bitwise or
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44 lw_expr_oper_bwxor, // bitwise xor
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45 lw_expr_oper_and, // boolean and
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46 lw_expr_oper_or, // boolean or
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47 lw_expr_oper_neg, // unary negation, 2's complement
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48 lw_expr_oper_com // unary 1's complement
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49 };
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50
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51 #ifdef ___lw_expr_c_seen___
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52
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53 typedef struct lw_expr_priv * lw_expr_t;
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54
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55 struct lw_expr_opers
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56 {
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57 lw_expr_t p;
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58 struct lw_expr_opers *next;
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59 };
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60
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61 struct lw_expr_priv
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62 {
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63 int type; // type of term
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64 int value; // integer value
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65 void *value2; // misc pointer value
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66 int refcount; // reference count
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67 struct lw_expr_opers *operands; // ptr to list of operands (for operators)
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68 };
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69
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70
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71 #else /* def ___lw_expr_c_seen___ */
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72
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73 typedef void * lw_expr_t;
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74
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75 extern lw_expr_t lwexpr_create(void);
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76 extern void lwexpr_destroy(lw_expr_t E);
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77 extern lw_expr_t lw_expr_deref(lw_expr_t r);
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78 extern lw_expr_t lw_expr_copy(lw_expr_t E);
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79 extern void lw_expr_add_operand(lw_expr_t E, lw_expr_t O);
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80 extern lw_expr_t lw_expr_deepcopy(lw_expr_t E);
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81 extern lw_expr_t lw_expr_build(int exprtype, ...);
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82 extern void lw_expr_print(lw_expr_t E);
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83 extern int lw_expr_compare(lw_expr_t E1, lw_expr_t E2);
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84
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85 #endif /* def ___lw_expr_c_seen___ */
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86
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87 #endif /* ___lw_expr_h_seen___ */
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