Commit | Line | Data |
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6c6eaf9a | 1 | #ifndef lint |
60de5df9 | 2 | static char sccsid[] = "@(#)parser3.c 3.5 %G%"; |
6c6eaf9a EW |
3 | #endif |
4 | ||
60de5df9 EW |
5 | /* |
6 | * Copyright (c) 1983 Regents of the University of California, | |
7 | * All rights reserved. Redistribution permitted subject to | |
8 | * the terms of the Berkeley Software License Agreement. | |
9 | */ | |
10 | ||
6c6eaf9a EW |
11 | #include "parser.h" |
12 | ||
13 | /* | |
14 | * = | |
15 | * ? : | |
16 | * || | |
17 | * && | |
18 | * | | |
19 | * ^ | |
20 | * & | |
21 | * == != | |
22 | * <= >= | |
23 | * << >> | |
24 | * + - | |
25 | * * / % | |
26 | * unary - + ~ ! | |
27 | */ | |
28 | p_expr(v, flag) | |
29 | register struct value *v; | |
30 | char flag; | |
31 | { | |
32 | struct value t; | |
33 | int ret; | |
34 | ||
6c6eaf9a EW |
35 | if (p_expr0(&t, flag) < 0) |
36 | return -1; | |
37 | ||
38 | if (token != T_ASSIGN) { | |
39 | *v = t; | |
40 | return 0; | |
41 | } | |
42 | switch (t.v_type) { | |
bb4a0c0b EW |
43 | case V_NUM: |
44 | p_error("%d: Not a variable.", t.v_num); | |
6c6eaf9a EW |
45 | case V_ERR: |
46 | t.v_str = 0; | |
47 | break; | |
6c6eaf9a EW |
48 | } |
49 | ret = p_assign(t.v_str, v, flag); | |
50 | if (t.v_str != 0) | |
51 | str_free(t.v_str); | |
52 | return ret; | |
53 | } | |
54 | ||
55 | /* | |
56 | * ? : | |
57 | */ | |
58 | p_expr0(v, flag) | |
59 | register struct value *v; | |
60 | char flag; | |
61 | { | |
62 | struct value t; | |
63 | char true; | |
64 | ||
65 | if (p_expr1(v, flag) < 0) | |
66 | return -1; | |
67 | if (token != T_QUEST) | |
68 | return 0; | |
69 | switch (v->v_type) { | |
70 | case V_NUM: | |
71 | true = v->v_num != 0; | |
72 | break; | |
73 | case V_STR: | |
fbbe9777 | 74 | p_error("?: Numeric left operand required."); |
6c6eaf9a EW |
75 | str_free(v->v_str); |
76 | v->v_type = V_ERR; | |
77 | case V_ERR: | |
78 | flag = 0; | |
79 | break; | |
80 | } | |
81 | (void) s_gettok(); | |
82 | v->v_type = V_ERR; | |
83 | if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0) | |
84 | return -1; | |
85 | if (token != T_COLON) { | |
86 | val_free(*v); | |
87 | p_synerror(); | |
88 | return -1; | |
89 | } | |
90 | (void) s_gettok(); | |
91 | return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0); | |
92 | } | |
93 | ||
94 | /* | |
95 | * || | |
96 | */ | |
97 | p_expr1(v, flag) | |
98 | register struct value *v; | |
99 | char flag; | |
100 | { | |
101 | char true = 0; | |
102 | ||
103 | if (p_expr2(v, flag) < 0) | |
104 | return -1; | |
105 | if (token != T_OROR) | |
106 | return 0; | |
107 | for (;;) { | |
108 | switch (v->v_type) { | |
109 | case V_NUM: | |
110 | v->v_num = true = true || v->v_num != 0; | |
111 | break; | |
112 | case V_STR: | |
fbbe9777 | 113 | p_error("||: Numeric operands required."); |
6c6eaf9a EW |
114 | str_free(v->v_str); |
115 | v->v_type = V_ERR; | |
116 | case V_ERR: | |
117 | flag = 0; | |
118 | break; | |
119 | } | |
120 | if (token != T_OROR) | |
121 | return 0; | |
122 | (void) s_gettok(); | |
123 | if (p_expr2(v, flag && !true) < 0) | |
124 | return -1; | |
125 | } | |
126 | } | |
127 | ||
128 | /* | |
129 | * && | |
130 | */ | |
131 | p_expr2(v, flag) | |
132 | register struct value *v; | |
133 | char flag; | |
134 | { | |
135 | char true = 1; | |
136 | ||
137 | if (p_expr3_10(3, v, flag) < 0) | |
138 | return -1; | |
139 | if (token != T_ANDAND) | |
140 | return 0; | |
141 | for (;;) { | |
142 | switch (v->v_type) { | |
143 | case V_NUM: | |
144 | v->v_num = true = true && v->v_num != 0; | |
145 | break; | |
146 | case V_STR: | |
fbbe9777 | 147 | p_error("&&: Numeric operands required."); |
6c6eaf9a EW |
148 | str_free(v->v_str); |
149 | v->v_type = V_ERR; | |
150 | case V_ERR: | |
151 | flag = 0; | |
152 | break; | |
153 | } | |
154 | if (token != T_ANDAND) | |
155 | return 0; | |
156 | (void) s_gettok(); | |
157 | if (p_expr3_10(3, v, flag && true) < 0) | |
158 | return -1; | |
159 | } | |
160 | /*NOTREACHED*/ | |
161 | } |