1/* Copyright 2016 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include "tensorflow/tsl/platform/scanner.h"
17
18namespace tsl {
19namespace strings {
20
21void Scanner::ScanUntilImpl(char end_ch, bool escaped) {
22 for (;;) {
23 if (cur_.empty()) {
24 Error();
25 return;
26 }
27 const char ch = cur_[0];
28 if (ch == end_ch) {
29 return;
30 }
31
32 cur_.remove_prefix(1);
33 if (escaped && ch == '\\') {
34 // Escape character, skip next character.
35 if (cur_.empty()) {
36 Error();
37 return;
38 }
39 cur_.remove_prefix(1);
40 }
41 }
42}
43
44bool Scanner::GetResult(StringPiece* remaining, StringPiece* capture) {
45 if (error_) {
46 return false;
47 }
48 if (remaining != nullptr) {
49 *remaining = cur_;
50 }
51 if (capture != nullptr) {
52 const char* end = capture_end_ == nullptr ? cur_.data() : capture_end_;
53 *capture = StringPiece(capture_start_, end - capture_start_);
54 }
55 return true;
56}
57
58} // namespace strings
59} // namespace tsl
60