2 * Copyright 2015 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 #include <folly/String.h>
21 static inline bool is_oddspace(char c) {
22 return c == '\n' || c == '\t' || c == '\r';
25 StringPiece ltrimWhitespace(StringPiece sp) {
26 // Spaces other than ' ' characters are less common but should be
27 // checked. This configuration where we loop on the ' '
28 // separately from oddspaces was empirically fastest.
31 for (; !sp.empty() && sp.front() == ' '; sp.pop_front()) {
33 if (!sp.empty() && is_oddspace(sp.front())) {
41 StringPiece rtrimWhitespace(StringPiece sp) {
42 // Spaces other than ' ' characters are less common but should be
43 // checked. This configuration where we loop on the ' '
44 // separately from oddspaces was empirically fastest.
47 for (; !sp.empty() && sp.back() == ' '; sp.pop_back()) {
49 if (!sp.empty() && is_oddspace(sp.back())) {