1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <google/protobuf/util/internal/field_mask_utility.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/stubs/status_macros.h>
namespace google {
namespace protobuf {
namespace util {
namespace converter {
namespace {
inline util::Status CallPathSink(PathSinkCallback path_sink,
StringPiece arg) {
return path_sink->Run(arg);
}
// Appends a FieldMask path segment to a prefix.
string AppendPathSegmentToPrefix(StringPiece prefix, StringPiece segment) {
if (prefix.empty()) {
return segment.ToString();
}
if (segment.empty()) {
return prefix.ToString();
}
// If the segment is a map key, appends it to the prefix without the ".".
if (segment.starts_with("[\"")) {
return StrCat(prefix, segment);
}
return StrCat(prefix, ".", segment);
}
} // namespace
string ConvertFieldMaskPath(const StringPiece path,
ConverterCallback converter) {
string result;
result.reserve(path.size() << 1);
bool is_quoted = false;
bool is_escaping = false;
int current_segment_start = 0;
// Loops until 1 passed the end of the input to make handling the last
// segment easier.
for (size_t i = 0; i <= path.size(); ++i) {
// Outputs quoted string as-is.
if (is_quoted) {
if (i == path.size()) {
break;
}
result.push_back(path[i]);
if (is_escaping) {
is_escaping = false;
} else if (path[i] == '\\') {
is_escaping = true;
} else if (path[i] == '\"') {
current_segment_start = i + 1;
is_quoted = false;
}
continue;
}
if (i == path.size() || path[i] == '.' || path[i] == '(' ||
path[i] == ')' || path[i] == '\"') {
result += converter(
path.substr(current_segment_start, i - current_segment_start));
if (i < path.size()) {
result.push_back(path[i]);
}
current_segment_start = i + 1;
}
if (i < path.size() && path[i] == '\"') {
is_quoted = true;
}
}
return result;
}
util::Status DecodeCompactFieldMaskPaths(StringPiece paths,
PathSinkCallback path_sink) {
std::stack<string> prefix;
int length = paths.length();
int previous_position = 0;
bool in_map_key = false;
bool is_escaping = false;
// Loops until 1 passed the end of the input to make the handle of the last
// segment easier.
for (int i = 0; i <= length; ++i) {
if (i != length) {
// Skips everything in a map key until we hit the end of it, which is
// marked by an un-escaped '"' immediately followed by a ']'.
if (in_map_key) {
if (is_escaping) {
is_escaping = false;
continue;
}
if (paths[i] == '\\') {
is_escaping = true;
continue;
}
if (paths[i] != '\"') {
continue;
}
// Un-escaped '"' must be followed with a ']'.
if (i >= length - 1 || paths[i + 1] != ']') {
return util::Status(
util::error::INVALID_ARGUMENT,
StrCat("Invalid FieldMask '", paths,
"'. Map keys should be represented as [\"some_key\"]."));
}
// The end of the map key ("\"]") has been found.
in_map_key = false;
// Skips ']'.
i++;
// Checks whether the key ends at the end of a path segment.
if (i < length - 1 && paths[i + 1] != '.' && paths[i + 1] != ',' &&
paths[i + 1] != ')' && paths[i + 1] != '(') {
return util::Status(
util::error::INVALID_ARGUMENT,
StrCat("Invalid FieldMask '", paths,
"'. Map keys should be at the end of a path segment."));
}
is_escaping = false;
continue;
}
// We are not in a map key, look for the start of one.
if (paths[i] == '[') {
if (i >= length - 1 || paths[i + 1] != '\"') {
return util::Status(
util::error::INVALID_ARGUMENT,
StrCat("Invalid FieldMask '", paths,
"'. Map keys should be represented as [\"some_key\"]."));
}
// "[\"" starts a map key.
in_map_key = true;
i++; // Skips the '\"'.
continue;
}
// If the current character is not a special character (',', '(' or ')'),
// continue to the next.
if (paths[i] != ',' && paths[i] != ')' && paths[i] != '(') {
continue;
}
}
// Gets the current segment - sub-string between previous position (after
// '(', ')', ',', or the beginning of the input) and the current position.
StringPiece segment =
paths.substr(previous_position, i - previous_position);
string current_prefix = prefix.empty() ? "" : prefix.top();
if (i < length && paths[i] == '(') {
// Builds a prefix and save it into the stack.
prefix.push(AppendPathSegmentToPrefix(current_prefix, segment));
} else if (!segment.empty()) {
// When the current charactor is ')', ',' or the current position has
// passed the end of the input, builds and outputs a new paths by
// concatenating the last prefix with the current segment.
RETURN_IF_ERROR(CallPathSink(
path_sink, AppendPathSegmentToPrefix(current_prefix, segment)));
}
// Removes the last prefix after seeing a ')'.
if (i < length && paths[i] == ')') {
if (prefix.empty()) {
return util::Status(
util::error::INVALID_ARGUMENT,
StrCat("Invalid FieldMask '", paths,
"'. Cannot find matching '(' for all ')'."));
}
prefix.pop();
}
previous_position = i + 1;
}
if (in_map_key) {
return util::Status(util::error::INVALID_ARGUMENT,
StrCat("Invalid FieldMask '", paths,
"'. Cannot find matching ']' for all '['."));
}
if (!prefix.empty()) {
return util::Status(util::error::INVALID_ARGUMENT,
StrCat("Invalid FieldMask '", paths,
"'. Cannot find matching ')' for all '('."));
}
return util::Status();
}
} // namespace converter
} // namespace util
} // namespace protobuf
} // namespace google
|
