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annotate lwlib/lw_expr.h @ 350:f0910d85f7db

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Remove extraneous PWD reference from Makefile. It's not clear why the $PWD reference was even present. It was possibly a historical artifact from a previous Makefile structure. Thank you to Tormod Volden for recommending the fix.
author William Astle <lost@l-w.ca>
date Mon, 13 Apr 2015 08:46:17 -0600
parents 6138e304ab9a
children 4130ffdeb5c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #include <stdio.h>
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26
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27 enum
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28 {
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29 lw_expr_type_oper, // operator term
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30 lw_expr_type_int, // integer
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31 lw_expr_type_var, // a "variable" (string for the name)
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32 lw_expr_type_special // a "special" reference (user defined)
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33 };
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34
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35 enum
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36 {
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37 lw_expr_oper_plus = 1, // addition
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38 lw_expr_oper_minus, // subtraction
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39 lw_expr_oper_times, // multiplication
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40 lw_expr_oper_divide, // division
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41 lw_expr_oper_mod, // modulus
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42 lw_expr_oper_intdiv, // integer division
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43 lw_expr_oper_bwand, // bitwise and
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44 lw_expr_oper_bwor, // bitwise or
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45 lw_expr_oper_bwxor, // bitwise xor
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46 lw_expr_oper_and, // boolean and
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47 lw_expr_oper_or, // boolean or
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48 lw_expr_oper_neg, // unary negation, 2's complement
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49 lw_expr_oper_com, // unary 1's complement
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50 lw_expr_oper_none = 0
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51 };
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52
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53 #ifdef ___lw_expr_c_seen___
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54
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55 typedef struct lw_expr_priv * lw_expr_t;
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56
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57 struct lw_expr_opers
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58 {
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59 lw_expr_t p;
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60 struct lw_expr_opers *next;
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61 };
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62
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63 struct lw_expr_priv
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64 {
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65 int type; // type of term
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66 int value; // integer value
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67 void *value2; // misc pointer value
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68 struct lw_expr_opers *operands; // ptr to list of operands (for operators)
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69 };
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70
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71 typedef lw_expr_t lw_expr_fn_t(int t, void *ptr, void *priv);
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72 typedef lw_expr_t lw_expr_fn2_t(char *var, void *priv);
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73 typedef lw_expr_t lw_expr_fn3_t(char **p, void *priv);
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74 typedef int lw_expr_testfn_t(lw_expr_t e, void *priv);
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75
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76 #else /* def ___lw_expr_c_seen___ */
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77
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78 typedef void * lw_expr_t;
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79
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80 extern lw_expr_t lwexpr_create(void);
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81 extern void lw_expr_destroy(lw_expr_t E);
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82 extern lw_expr_t lw_expr_copy(lw_expr_t E);
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83 extern void lw_expr_add_operand(lw_expr_t E, lw_expr_t O);
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84 extern lw_expr_t lw_expr_build(int exprtype, ...);
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85 extern char *lw_expr_print(lw_expr_t E);
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86 extern int lw_expr_compare(lw_expr_t E1, lw_expr_t E2);
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87 extern void lw_expr_simplify(lw_expr_t E, void *priv);
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88
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89 typedef lw_expr_t lw_expr_fn_t(int t, void *ptr, void *priv);
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90 typedef lw_expr_t lw_expr_fn2_t(char *var, void *priv);
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91 typedef lw_expr_t lw_expr_fn3_t(char **p, void *priv);
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92
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93 extern void lw_expr_set_special_handler(lw_expr_fn_t *fn);
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94 extern void lw_expr_set_var_handler(lw_expr_fn2_t *fn);
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95 extern void lw_expr_set_term_parser(lw_expr_fn3_t *fn);
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96
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97 extern lw_expr_t lw_expr_parse(char **p, void *priv);
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98 extern int lw_expr_istype(lw_expr_t e, int t);
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99 extern int lw_expr_intval(lw_expr_t e);
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100 extern int lw_expr_specint(lw_expr_t e);
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101 extern void *lw_expr_specptr(lw_expr_t e);
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102 extern int lw_expr_whichop(lw_expr_t e);
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103
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104 extern int lw_expr_type(lw_expr_t e);
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105
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106 typedef int lw_expr_testfn_t(lw_expr_t e, void *priv);
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107
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108 extern int lw_expr_operandcount(lw_expr_t e);
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109
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110 // run a function on all terms in an expression; if the function
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111 // returns non-zero for any term, return non-zero, else return
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112 // zero
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113 extern int lw_expr_testterms(lw_expr_t e, lw_expr_testfn_t *fn, void *priv);
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114
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115 extern void lw_expr_setdivzero(void (*fn)(void *priv));
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116
0
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117 #endif /* def ___lw_expr_c_seen___ */
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118
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119 #endif /* ___lw_expr_h_seen___ */