Guido van Rossum | e270b43 | 1992-09-03 20:21:07 +0000 | [diff] [blame^] | 1 | /*********************************************************** |
| 2 | Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The |
| 3 | Netherlands. |
| 4 | |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
| 9 | provided that the above copyright notice appear in all copies and that |
| 10 | both that copyright notice and this permission notice appear in |
| 11 | supporting documentation, and that the names of Stichting Mathematisch |
| 12 | Centrum or CWI not be used in advertising or publicity pertaining to |
| 13 | distribution of the software without specific, written prior permission. |
| 14 | |
| 15 | STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO |
| 16 | THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| 17 | FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE |
| 18 | FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 19 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 20 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 21 | OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 22 | |
| 23 | ******************************************************************/ |
| 24 | |
| 25 | /* strop module */ |
| 26 | |
| 27 | #include "allobjects.h" |
| 28 | #include "modsupport.h" |
| 29 | |
| 30 | |
| 31 | static object * |
| 32 | strop_split(self, args) |
| 33 | object *self; /* Not used */ |
| 34 | object *args; |
| 35 | { |
| 36 | int len, i, j; |
| 37 | char *s; |
| 38 | char c; |
| 39 | object *list, *item; |
| 40 | |
| 41 | if (!getargs(args, "s#", &s, &len)) |
| 42 | return NULL; |
| 43 | list = newlistobject(0); |
| 44 | if (list == NULL) |
| 45 | return NULL; |
| 46 | |
| 47 | i = 0; |
| 48 | while (i < len) { |
| 49 | while (i < len && |
| 50 | ((c = s[i]) == ' ' || c == '\t' || c == '\n')) { |
| 51 | i = i+1; |
| 52 | } |
| 53 | j = i; |
| 54 | while (i < len && |
| 55 | !((c = s[i]) == ' ' || c == '\t' || c == '\n')) { |
| 56 | i = i+1; |
| 57 | } |
| 58 | if (j < i) { |
| 59 | item = newsizedstringobject(s+j, (int)(i-j)); |
| 60 | if (item == NULL || addlistitem(list, item) < 0) { |
| 61 | DECREF(list); |
| 62 | return NULL; |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | return list; |
| 68 | } |
| 69 | |
| 70 | |
| 71 | static object * |
| 72 | strop_splitfields(self, args) |
| 73 | object *self; /* Not used */ |
| 74 | object *args; |
| 75 | { |
| 76 | int len, n, i, j; |
| 77 | char *s, *sub; |
| 78 | char c; |
| 79 | object *list, *item; |
| 80 | |
| 81 | if (!getargs(args, "(s#s#)", &s, &len, &sub, &n)) |
| 82 | return NULL; |
| 83 | if (n == 0) { |
| 84 | err_setstr(ValueError, "empty separator"); |
| 85 | return NULL; |
| 86 | } |
| 87 | |
| 88 | list = newlistobject(0); |
| 89 | if (list == NULL) |
| 90 | return NULL; |
| 91 | |
| 92 | i = j = 0; |
| 93 | while (i+n <= len) { |
| 94 | if (s[i] == sub[0] && (n == 1 || strncmp(s+i, sub, n) == 0)) { |
| 95 | item = newsizedstringobject(s+j, (int)(i-j)); |
| 96 | if (item == NULL || addlistitem(list, item) < 0) { |
| 97 | DECREF(list); |
| 98 | return NULL; |
| 99 | } |
| 100 | i = j = i + n; |
| 101 | } |
| 102 | else |
| 103 | i++; |
| 104 | } |
| 105 | item = newsizedstringobject(s+j, (int)(len-j)); |
| 106 | if (item == NULL || addlistitem(list, item) < 0) { |
| 107 | DECREF(list); |
| 108 | return NULL; |
| 109 | } |
| 110 | |
| 111 | return list; |
| 112 | } |
| 113 | |
| 114 | |
| 115 | static object * |
| 116 | strop_index(self, args) |
| 117 | object *self; /* Not used */ |
| 118 | object *args; |
| 119 | { |
| 120 | char *s, *sub; |
| 121 | int len, n, i; |
| 122 | |
| 123 | if (getargs(args, "(s#s#i)", &s, &len, &sub, &n, &i)) { |
| 124 | if (i < 0 || i+n > len) { |
| 125 | err_setstr(ValueError, "start offset out of range"); |
| 126 | return NULL; |
| 127 | } |
| 128 | } |
| 129 | else { |
| 130 | err_clear(); |
| 131 | if (!getargs(args, "(s#s#)", &s, &len, &sub, &n)) |
| 132 | return NULL; |
| 133 | i = 0; |
| 134 | } |
| 135 | |
| 136 | if (n == 0) |
| 137 | return newintobject((long)i); |
| 138 | |
| 139 | len -= n; |
| 140 | for (; i <= len; i++) { |
| 141 | if (s[i] == sub[0]) { |
| 142 | if (n == 1 || strncmp(s+i, sub, n) == 0) |
| 143 | return newintobject((long)i); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | err_setstr(ValueError, "substring not found"); |
| 148 | return NULL; |
| 149 | } |
| 150 | |
| 151 | |
| 152 | static object * |
| 153 | strop_strip(self, args) |
| 154 | object *self; /* Not used */ |
| 155 | object *args; |
| 156 | { |
| 157 | char *s; |
| 158 | int len, i, j; |
| 159 | char c; |
| 160 | |
| 161 | if (!getargs(args, "s#", &s, &len)) |
| 162 | return NULL; |
| 163 | |
| 164 | i = 0; |
| 165 | while (i < len && ((c = s[i]) == ' ' || c == '\t' || c == '\n')) { |
| 166 | i++; |
| 167 | } |
| 168 | |
| 169 | j = len; |
| 170 | do { |
| 171 | j--; |
| 172 | } while (j >= i && ((c = s[j]) == ' ' || c == '\t' || c == '\n')); |
| 173 | j++; |
| 174 | |
| 175 | if (i == 0 && j == len) { |
| 176 | INCREF(args); |
| 177 | return args; |
| 178 | } |
| 179 | else |
| 180 | return newsizedstringobject(s+i, j-i); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | /* List of functions defined in the module */ |
| 185 | |
| 186 | static struct methodlist strop_methods[] = { |
| 187 | {"index", strop_index}, |
| 188 | {"split", strop_split}, |
| 189 | {"splitfields", strop_splitfields}, |
| 190 | {"strip", strop_strip}, |
| 191 | {NULL, NULL} /* sentinel */ |
| 192 | }; |
| 193 | |
| 194 | |
| 195 | /* Initialization function for the module (*must* be called initstrop) */ |
| 196 | |
| 197 | void |
| 198 | initstrop() |
| 199 | { |
| 200 | initmodule("strop", strop_methods); |
| 201 | } |