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comparison directive.c @ 16:9dda765ee85c

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expression evaluator
author David A. Holland
date Mon, 20 Dec 2010 00:32:20 -0500 (2010-12-20)
parents f6177d3ed5c2
children c08a947d8f30
comparison
equal deleted inserted replaced
15:f6177d3ed5c2 16:9dda765ee85c
9 #include "files.h" 9 #include "files.h"
10 #include "directive.h" 10 #include "directive.h"
11 #include "macro.h" 11 #include "macro.h"
12 #include "eval.h" 12 #include "eval.h"
13 13
14 static const char ws[] = " \t\f\v";
15
16 struct ifstate { 14 struct ifstate {
17 struct ifstate *prev; 15 struct ifstate *prev;
18 struct place startplace; 16 struct place startplace;
19 bool curtrue; 17 bool curtrue;
20 bool evertrue; 18 bool evertrue;
92 void 90 void
93 d_if(struct place *p, struct place *p2, char *line, size_t len) 91 d_if(struct place *p, struct place *p2, char *line, size_t len)
94 { 92 {
95 char *expr; 93 char *expr;
96 bool val; 94 bool val;
95 struct place p3 = *p2;
97 96
98 expr = macroexpand(p2, line, len, true); 97 expr = macroexpand(p2, line, len, true);
99 val = eval(expr); 98 val = eval(&p3, expr);
100 ifstate_push(p, val); 99 ifstate_push(p, val);
101 free(expr); 100 free(expr);
102 } 101 }
103 102
104 static 103 static
120 static 119 static
121 void 120 void
122 d_elif(struct place *p, struct place *p2, char *line, size_t len) 121 d_elif(struct place *p, struct place *p2, char *line, size_t len)
123 { 122 {
124 char *expr; 123 char *expr;
124 struct place p3 = *p2;
125 125
126 if (ifstate->seenelse) { 126 if (ifstate->seenelse) {
127 complain(p, "#elif after #else"); 127 complain(p, "#elif after #else");
128 complain_fail(); 128 complain_fail();
129 } 129 }
130 130
131 if (ifstate->evertrue) { 131 if (ifstate->evertrue) {
132 ifstate->curtrue = false; 132 ifstate->curtrue = false;
133 } else { 133 } else {
134 expr = macroexpand(p2, line, len, true); 134 expr = macroexpand(p2, line, len, true);
135 ifstate->curtrue = eval(expr); 135 ifstate->curtrue = eval(&p3, expr);
136 ifstate->evertrue = ifstate->curtrue; 136 ifstate->evertrue = ifstate->curtrue;
137 free(expr); 137 free(expr);
138 } 138 }
139 } 139 }
140 140