1 /* This file is part of the 'stringi' project.
2 * Copyright (c) 2013-2021, Marek Gagolewski <https://www.gagolewski.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
28 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
29 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32
33 #include "stri_stringi.h"
34 #include "stri_container_utf8.h"
35 #include "stri_container_charclass.h"
36
37
38 /**
39 * Trim characters from a charclass from left AND/OR right side of the string
40 *
41 * @param str character vector
42 * @param pattern character vector
43 * @param left from left?
44 * @param right from left?
45 * @return character vector
46 *
47 * @version 0.1-?? (Bartek Tartanus)
48 *
49 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
50 * Use StriContainerUTF8 and CharClass
51 *
52 * @version 0.1-?? (Marek Gagolewski, 2013-06-16)
53 * make StriException-friendly & Use StrContainerCharClass
54 *
55 * @version 0.2-1 (Marek Gagolewski, 2014-04-03)
56 * detects invalid UTF-8 byte stream
57 *
58 * @version 0.2-1 (Marek Gagolewski, 2014-04-05)
59 * StriContainerCharClass now relies on UnicodeSet
60 *
61 * @version 0.3-1 (Marek Gagolewski, 2014-11-04)
62 * Issue #112: str_prepare_arg* retvals were not PROTECTed from gc
63 *
64 * @version 1.6.3 (Marek Gagolewski, 2021-06-10) negate
65 */
stri__trim_leftright(SEXP str,SEXP pattern,bool left,bool right,bool negate)66 SEXP stri__trim_leftright(SEXP str, SEXP pattern, bool left, bool right, bool negate)
67 {
68 PROTECT(str = stri__prepare_arg_string(str, "str"));
69 PROTECT(pattern = stri__prepare_arg_string(pattern, "pattern"));
70 R_len_t vectorize_length =
71 stri__recycling_rule(true, 2, LENGTH(str), LENGTH(pattern));
72
73 STRI__ERROR_HANDLER_BEGIN(2)
74 StriContainerUTF8 str_cont(str, vectorize_length);
75 StriContainerCharClass pattern_cont(pattern, vectorize_length, negate);
76
77 SEXP ret;
78 STRI__PROTECT(ret = Rf_allocVector(STRSXP, vectorize_length));
79
80 for (R_len_t i = pattern_cont.vectorize_init();
81 i != pattern_cont.vectorize_end();
82 i = pattern_cont.vectorize_next(i))
83 {
84 if (str_cont.isNA(i) || pattern_cont.isNA(i)) {
85 SET_STRING_ELT(ret, i, NA_STRING);
86 continue;
87 }
88
89 const UnicodeSet* pattern_cur = &pattern_cont.get(i);
90 R_len_t str_cur_n = str_cont.get(i).length();
91 const char* str_cur_s = str_cont.get(i).c_str();
92 R_len_t jlast1 = 0;
93 R_len_t jlast2 = str_cur_n;
94
95 if (left) {
96 UChar32 chr;
97 for (R_len_t j=0; j<str_cur_n; ) {
98 U8_NEXT(str_cur_s, j, str_cur_n, chr); // "look ahead"
99 if (chr < 0) // invalid UTF-8 sequence
100 throw StriException(MSG__INVALID_UTF8);
101 if (pattern_cur->contains(chr)) {
102 break; // break at first occurrence
103 }
104 jlast1 = j;
105 }
106 }
107
108 if (right && jlast1 < str_cur_n) {
109 UChar32 chr;
110 for (R_len_t j=str_cur_n; j>0; ) {
111 U8_PREV(str_cur_s, 0, j, chr); // "look behind"
112 if (chr < 0) // invalid utf-8 sequence
113 throw StriException(MSG__INVALID_UTF8);
114 if (pattern_cur->contains(chr)) {
115 break; // break at first occurrence
116 }
117 jlast2 = j;
118 }
119 }
120
121 // now jlast is the index, from which we start copying
122 SET_STRING_ELT(ret, i,
123 Rf_mkCharLenCE(str_cur_s+jlast1, (jlast2-jlast1), CE_UTF8));
124 }
125
126 STRI__UNPROTECT_ALL
127 return ret;
128 STRI__ERROR_HANDLER_END(;/* nothing special to be done on error */)
129 }
130
131
132 /**
133 * Trim characters from a charclass from both sides of the string
134 *
135 * @param str character vector
136 * @param pattern character vector
137 * @return character vector
138 *
139 * @version 0.1-?? (Bartek Tartanus)
140 *
141 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
142 * Use stri__trim_leftright
143 *
144 * @version 0.1-?? (Marek Gagolewski, 2013-06-16)
145 * make StriException-friendly
146 *
147 * @version 1.6.3 (Marek Gagolewski, 2021-06-10) negate
148 */
stri_trim_both(SEXP str,SEXP pattern,SEXP negate)149 SEXP stri_trim_both(SEXP str, SEXP pattern, SEXP negate)
150 {
151 bool negate_val = stri__prepare_arg_logical_1_notNA(negate, "negate");
152 return stri__trim_leftright(str, pattern, true, true, negate_val);
153 }
154
155
156 /**
157 * Trim characters from a charclass from the left of the string
158 *
159 * @param str character vector
160 * @param pattern character vector
161 * @return character vector
162 *
163 * @version 0.1-?? (Bartek Tartanus)
164 *
165 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
166 * Use stri__trim_leftright
167 *
168 * @version 1.6.3 (Marek Gagolewski, 2021-06-10) negate
169 */
stri_trim_left(SEXP str,SEXP pattern,SEXP negate)170 SEXP stri_trim_left(SEXP str, SEXP pattern, SEXP negate)
171 {
172 bool negate_val = stri__prepare_arg_logical_1_notNA(negate, "negate");
173 return stri__trim_leftright(str, pattern, true, false, negate_val);
174 }
175
176
177 /**
178 * Trim characters from a charclass from the right of the string
179 *
180 * @param str character vector
181 * @param pattern character vector
182 * @return character vector
183 *
184 * @version 0.1-?? (Bartek Tartanus)
185 *
186 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
187 * Use stri__trim_leftright
188 *
189 * @version 1.6.3 (Marek Gagolewski, 2021-06-10) negate
190 */
stri_trim_right(SEXP str,SEXP pattern,SEXP negate)191 SEXP stri_trim_right(SEXP str, SEXP pattern, SEXP negate)
192 {
193 bool negate_val = stri__prepare_arg_logical_1_notNA(negate, "negate");
194 return stri__trim_leftright(str, pattern, false, true, negate_val);
195 }
196