2 * Copyright 2013 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef FOLLY_STRINGGEN_H_
18 #define FOLLY_STRINGGEN_H_
20 #include "folly/Range.h"
26 class StringResplitter;
27 class SplitStringSource;
29 template<class Delimiter, class Output>
32 template<class Delimiter, class OutputBuffer>
37 * Split the output from a generator into StringPiece "lines" delimited by
38 * the given delimiter. Delimters are NOT included in the output.
40 * resplit() behaves as if the input strings were concatenated into one long
41 * string and then split.
43 // make this a template so we don't require StringResplitter to be complete
45 template <class S=detail::StringResplitter>
46 S resplit(char delimiter) {
50 template <class S=detail::SplitStringSource>
51 S split(const StringPiece& source, char delimiter) {
52 return S(source, delimiter);
56 * Joins a sequence of tokens into a string, with the chosen delimiter.
59 * fbstring result = split("a,b,c", ",") | unsplit(",");
60 * assert(result == "a,b,c");
62 * std::string result = split("a,b,c", ",") | unsplit<std::string>(" ");
63 * assert(result == "a b c");
67 // NOTE: The template arguments are reversed to allow the user to cleanly
68 // specify the output type while still inferring the type of the delimiter.
69 template<class Output = folly::fbstring,
71 class Unsplit = detail::Unsplit<Delimiter, Output>>
72 Unsplit unsplit(const Delimiter& delimiter) {
73 return Unsplit(delimiter);
77 * Joins a sequence of tokens into a string, appending them to the output
78 * buffer. If the output buffer is empty, an initial delimiter will not be
79 * inserted at the start.
83 * split("a,b,c", ",") | unsplit(",", &buffer);
84 * assert(buffer == "a,b,c");
86 * std::string anotherBuffer("initial");
87 * split("a,b,c", ",") | unsplit(",", &anotherbuffer);
88 * assert(anotherBuffer == "initial,a,b,c");
90 template<class Delimiter,
92 class UnsplitBuffer = detail::UnsplitBuffer<Delimiter, OutputBuffer>>
93 UnsplitBuffer unsplit(const Delimiter& delimiter, OutputBuffer* outputBuffer) {
94 return UnsplitBuffer(delimiter, outputBuffer);
100 #include "folly/experimental/StringGen-inl.h"
102 #endif /* FOLLY_STRINGGEN_H_ */