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60de5df9 | 1 | /* |
46e9ea25 KB |
2 | * Copyright (c) 1983 Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
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6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
60de5df9 EW |
16 | */ |
17 | ||
46e9ea25 | 18 | #ifndef lint |
5e8b0e60 | 19 | static char sccsid[] = "@(#)parser3.c 3.7 (Berkeley) %G%"; |
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20 | #endif /* not lint */ |
21 | ||
6c6eaf9a EW |
22 | #include "parser.h" |
23 | ||
24 | /* | |
25 | * = | |
26 | * ? : | |
27 | * || | |
28 | * && | |
29 | * | | |
30 | * ^ | |
31 | * & | |
32 | * == != | |
33 | * <= >= | |
34 | * << >> | |
35 | * + - | |
36 | * * / % | |
37 | * unary - + ~ ! | |
38 | */ | |
39 | p_expr(v, flag) | |
40 | register struct value *v; | |
41 | char flag; | |
42 | { | |
43 | struct value t; | |
44 | int ret; | |
45 | ||
6c6eaf9a EW |
46 | if (p_expr0(&t, flag) < 0) |
47 | return -1; | |
48 | ||
49 | if (token != T_ASSIGN) { | |
50 | *v = t; | |
51 | return 0; | |
52 | } | |
53 | switch (t.v_type) { | |
bb4a0c0b EW |
54 | case V_NUM: |
55 | p_error("%d: Not a variable.", t.v_num); | |
6c6eaf9a EW |
56 | case V_ERR: |
57 | t.v_str = 0; | |
58 | break; | |
6c6eaf9a EW |
59 | } |
60 | ret = p_assign(t.v_str, v, flag); | |
61 | if (t.v_str != 0) | |
62 | str_free(t.v_str); | |
63 | return ret; | |
64 | } | |
65 | ||
66 | /* | |
67 | * ? : | |
68 | */ | |
69 | p_expr0(v, flag) | |
70 | register struct value *v; | |
71 | char flag; | |
72 | { | |
73 | struct value t; | |
74 | char true; | |
75 | ||
76 | if (p_expr1(v, flag) < 0) | |
77 | return -1; | |
78 | if (token != T_QUEST) | |
79 | return 0; | |
80 | switch (v->v_type) { | |
81 | case V_NUM: | |
82 | true = v->v_num != 0; | |
83 | break; | |
84 | case V_STR: | |
fbbe9777 | 85 | p_error("?: Numeric left operand required."); |
6c6eaf9a EW |
86 | str_free(v->v_str); |
87 | v->v_type = V_ERR; | |
88 | case V_ERR: | |
89 | flag = 0; | |
90 | break; | |
91 | } | |
92 | (void) s_gettok(); | |
93 | v->v_type = V_ERR; | |
94 | if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0) | |
95 | return -1; | |
96 | if (token != T_COLON) { | |
97 | val_free(*v); | |
98 | p_synerror(); | |
99 | return -1; | |
100 | } | |
101 | (void) s_gettok(); | |
102 | return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0); | |
103 | } | |
104 | ||
105 | /* | |
106 | * || | |
107 | */ | |
108 | p_expr1(v, flag) | |
109 | register struct value *v; | |
110 | char flag; | |
111 | { | |
112 | char true = 0; | |
113 | ||
114 | if (p_expr2(v, flag) < 0) | |
115 | return -1; | |
116 | if (token != T_OROR) | |
117 | return 0; | |
118 | for (;;) { | |
119 | switch (v->v_type) { | |
120 | case V_NUM: | |
121 | v->v_num = true = true || v->v_num != 0; | |
122 | break; | |
123 | case V_STR: | |
fbbe9777 | 124 | p_error("||: Numeric operands required."); |
6c6eaf9a EW |
125 | str_free(v->v_str); |
126 | v->v_type = V_ERR; | |
127 | case V_ERR: | |
128 | flag = 0; | |
129 | break; | |
130 | } | |
131 | if (token != T_OROR) | |
132 | return 0; | |
133 | (void) s_gettok(); | |
134 | if (p_expr2(v, flag && !true) < 0) | |
135 | return -1; | |
136 | } | |
137 | } | |
138 | ||
139 | /* | |
140 | * && | |
141 | */ | |
142 | p_expr2(v, flag) | |
143 | register struct value *v; | |
144 | char flag; | |
145 | { | |
146 | char true = 1; | |
147 | ||
148 | if (p_expr3_10(3, v, flag) < 0) | |
149 | return -1; | |
150 | if (token != T_ANDAND) | |
151 | return 0; | |
152 | for (;;) { | |
153 | switch (v->v_type) { | |
154 | case V_NUM: | |
155 | v->v_num = true = true && v->v_num != 0; | |
156 | break; | |
157 | case V_STR: | |
fbbe9777 | 158 | p_error("&&: Numeric operands required."); |
6c6eaf9a EW |
159 | str_free(v->v_str); |
160 | v->v_type = V_ERR; | |
161 | case V_ERR: | |
162 | flag = 0; | |
163 | break; | |
164 | } | |
165 | if (token != T_ANDAND) | |
166 | return 0; | |
167 | (void) s_gettok(); | |
168 | if (p_expr3_10(3, v, flag && true) < 0) | |
169 | return -1; | |
170 | } | |
171 | /*NOTREACHED*/ | |
172 | } |