Commit | Line | Data |
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6c6eaf9a | 1 | #ifndef lint |
7edc52ec | 2 | static char sccsid[] = "@(#)parser3.c 3.3 %G%"; |
6c6eaf9a EW |
3 | #endif |
4 | ||
5 | #include "parser.h" | |
6 | ||
7 | /* | |
8 | * = | |
9 | * ? : | |
10 | * || | |
11 | * && | |
12 | * | | |
13 | * ^ | |
14 | * & | |
15 | * == != | |
16 | * <= >= | |
17 | * << >> | |
18 | * + - | |
19 | * * / % | |
20 | * unary - + ~ ! | |
21 | */ | |
22 | p_expr(v, flag) | |
23 | register struct value *v; | |
24 | char flag; | |
25 | { | |
26 | struct value t; | |
27 | int ret; | |
28 | ||
6c6eaf9a EW |
29 | if (p_expr0(&t, flag) < 0) |
30 | return -1; | |
31 | ||
32 | if (token != T_ASSIGN) { | |
33 | *v = t; | |
34 | return 0; | |
35 | } | |
36 | switch (t.v_type) { | |
bb4a0c0b EW |
37 | case V_NUM: |
38 | p_error("%d: Not a variable.", t.v_num); | |
6c6eaf9a EW |
39 | case V_ERR: |
40 | t.v_str = 0; | |
41 | break; | |
6c6eaf9a EW |
42 | } |
43 | ret = p_assign(t.v_str, v, flag); | |
44 | if (t.v_str != 0) | |
45 | str_free(t.v_str); | |
46 | return ret; | |
47 | } | |
48 | ||
49 | /* | |
50 | * ? : | |
51 | */ | |
52 | p_expr0(v, flag) | |
53 | register struct value *v; | |
54 | char flag; | |
55 | { | |
56 | struct value t; | |
57 | char true; | |
58 | ||
59 | if (p_expr1(v, flag) < 0) | |
60 | return -1; | |
61 | if (token != T_QUEST) | |
62 | return 0; | |
63 | switch (v->v_type) { | |
64 | case V_NUM: | |
65 | true = v->v_num != 0; | |
66 | break; | |
67 | case V_STR: | |
68 | p_error("Numeric value required for ?."); | |
69 | str_free(v->v_str); | |
70 | v->v_type = V_ERR; | |
71 | case V_ERR: | |
72 | flag = 0; | |
73 | break; | |
74 | } | |
75 | (void) s_gettok(); | |
76 | v->v_type = V_ERR; | |
77 | if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0) | |
78 | return -1; | |
79 | if (token != T_COLON) { | |
80 | val_free(*v); | |
81 | p_synerror(); | |
82 | return -1; | |
83 | } | |
84 | (void) s_gettok(); | |
85 | return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0); | |
86 | } | |
87 | ||
88 | /* | |
89 | * || | |
90 | */ | |
91 | p_expr1(v, flag) | |
92 | register struct value *v; | |
93 | char flag; | |
94 | { | |
95 | char true = 0; | |
96 | ||
97 | if (p_expr2(v, flag) < 0) | |
98 | return -1; | |
99 | if (token != T_OROR) | |
100 | return 0; | |
101 | for (;;) { | |
102 | switch (v->v_type) { | |
103 | case V_NUM: | |
104 | v->v_num = true = true || v->v_num != 0; | |
105 | break; | |
106 | case V_STR: | |
107 | p_error("Numeric value required for ||."); | |
108 | str_free(v->v_str); | |
109 | v->v_type = V_ERR; | |
110 | case V_ERR: | |
111 | flag = 0; | |
112 | break; | |
113 | } | |
114 | if (token != T_OROR) | |
115 | return 0; | |
116 | (void) s_gettok(); | |
117 | if (p_expr2(v, flag && !true) < 0) | |
118 | return -1; | |
119 | } | |
120 | } | |
121 | ||
122 | /* | |
123 | * && | |
124 | */ | |
125 | p_expr2(v, flag) | |
126 | register struct value *v; | |
127 | char flag; | |
128 | { | |
129 | char true = 1; | |
130 | ||
131 | if (p_expr3_10(3, v, flag) < 0) | |
132 | return -1; | |
133 | if (token != T_ANDAND) | |
134 | return 0; | |
135 | for (;;) { | |
136 | switch (v->v_type) { | |
137 | case V_NUM: | |
138 | v->v_num = true = true && v->v_num != 0; | |
139 | break; | |
140 | case V_STR: | |
141 | p_error("Numeric value required for &&."); | |
142 | str_free(v->v_str); | |
143 | v->v_type = V_ERR; | |
144 | case V_ERR: | |
145 | flag = 0; | |
146 | break; | |
147 | } | |
148 | if (token != T_ANDAND) | |
149 | return 0; | |
150 | (void) s_gettok(); | |
151 | if (p_expr3_10(3, v, flag && true) < 0) | |
152 | return -1; | |
153 | } | |
154 | /*NOTREACHED*/ | |
155 | } |