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| 1 | +/* stringlib: find/index implementation */ | |
| 2 | + | |
| 3 | +#ifndef STRINGLIB_FIND_H | |
| 4 | +#define STRINGLIB_FIND_H | |
| 5 | + | |
| 6 | +#ifndef STRINGLIB_FASTSEARCH_H | |
| 7 | +#error must include "stringlib/fastsearch.h" before including this module | |
| 8 | +#endif | |
| 9 | + | |
| 10 | +Py_LOCAL_INLINE(Py_ssize_t) | |
| 11 | +stringlib_find(const STRINGLIB_CHAR* str, Py_ssize_t str_len, | |
| 12 | + const STRINGLIB_CHAR* sub, Py_ssize_t sub_len, | |
| 13 | + Py_ssize_t offset) | |
| 14 | +{ | |
| 15 | + Py_ssize_t pos; | |
| 16 | + | |
| 17 | + if (sub_len == 0) { | |
| 18 | + if (str_len < 0) | |
| 19 | + return -1; | |
| 20 | + return offset; | |
| 21 | + } | |
| 22 | + | |
| 23 | + pos = fastsearch(str, str_len, sub, sub_len, FAST_SEARCH); | |
| 24 | + | |
| 25 | + if (pos >= 0) | |
| 26 | + pos += offset; | |
| 27 | + | |
| 28 | + return pos; | |
| 29 | +} | |
| 30 | + | |
| 31 | +Py_LOCAL_INLINE(Py_ssize_t) | |
| 32 | +stringlib_rfind(const STRINGLIB_CHAR* str, Py_ssize_t str_len, | |
| 33 | + const STRINGLIB_CHAR* sub, Py_ssize_t sub_len, | |
| 34 | + Py_ssize_t offset) | |
| 35 | +{ | |
| 36 | + /* XXX - create reversefastsearch helper! */ | |
| 37 | + if (sub_len == 0) { | |
| 38 | + if (str_len < 0) | |
| 39 | + return -1; | |
| 40 | + return str_len + offset; | |
| 41 | + } else { | |
| 42 | + Py_ssize_t j, pos = -1; | |
| 43 | + for (j = str_len - sub_len; j >= 0; --j) | |
| 44 | + if (STRINGLIB_CMP(str+j, sub, sub_len) == 0) { | |
| 45 | + pos = j + offset; | |
| 46 | + break; | |
| 47 | + } | |
| 48 | + return pos; | |
| 49 | + } | |
| 50 | +} | |
| 51 | + | |
| 52 | +Py_LOCAL_INLINE(Py_ssize_t) | |
| 53 | +stringlib_find_slice(const STRINGLIB_CHAR* str, Py_ssize_t str_len, | |
| 54 | + const STRINGLIB_CHAR* sub, Py_ssize_t sub_len, | |
| 55 | + Py_ssize_t start, Py_ssize_t end) | |
| 56 | +{ | |
| 57 | + if (start < 0) | |
| 58 | + start += str_len; | |
| 59 | + if (start < 0) | |
| 60 | + start = 0; | |
| 61 | + if (end > str_len) | |
| 62 | + end = str_len; | |
| 63 | + if (end < 0) | |
| 64 | + end += str_len; | |
| 65 | + if (end < 0) | |
| 66 | + end = 0; | |
| 67 | + | |
| 68 | + return stringlib_find( | |
| 69 | + str + start, end - start, | |
| 70 | + sub, sub_len, start | |
| 71 | + ); | |
| 72 | +} | |
| 73 | + | |
| 74 | +Py_LOCAL_INLINE(Py_ssize_t) | |
| 75 | +stringlib_rfind_slice(const STRINGLIB_CHAR* str, Py_ssize_t str_len, | |
| 76 | + const STRINGLIB_CHAR* sub, Py_ssize_t sub_len, | |
| 77 | + Py_ssize_t start, Py_ssize_t end) | |
| 78 | +{ | |
| 79 | + if (start < 0) | |
| 80 | + start += str_len; | |
| 81 | + if (start < 0) | |
| 82 | + start = 0; | |
| 83 | + if (end > str_len) | |
| 84 | + end = str_len; | |
| 85 | + if (end < 0) | |
| 86 | + end += str_len; | |
| 87 | + if (end < 0) | |
| 88 | + end = 0; | |
| 89 | + | |
| 90 | + return stringlib_rfind(str + start, end - start, sub, sub_len, start); | |
| 91 | +} | |
| 92 | + | |
| 93 | +#ifdef STRINGLIB_STR | |
| 94 | + | |
| 95 | +Py_LOCAL_INLINE(int) | |
| 96 | +stringlib_contains_obj(PyObject* str, PyObject* sub) | |
| 97 | +{ | |
| 98 | + return stringlib_find( | |
| 99 | + STRINGLIB_STR(str), STRINGLIB_LEN(str), | |
| 100 | + STRINGLIB_STR(sub), STRINGLIB_LEN(sub), 0 | |
| 101 | + ) != -1; | |
| 102 | +} | |
| 103 | + | |
| 104 | +#endif /* STRINGLIB_STR */ | |
| 105 | + | |
| 106 | +#endif /* STRINGLIB_FIND_H */ | |
| 107 | + | |
| 108 | +/* | |
| 109 | +Local variables: | |
| 110 | +c-basic-offset: 4 | |
| 111 | +indent-tabs-mode: nil | |
| 112 | +End: | |
| 113 | +*/ | |