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 StringPiece skipWhitespace(StringPiece sp) {
22 // Spaces other than ' ' characters are less common but should be
23 // checked. This configuration where we loop on the ' '
24 // separately from oddspaces was empirically fastest.
25 auto oddspace = [] (char c) {
26 return c == '\n' || c == '\t' || c == '\r';
30 for (; !sp.empty() && sp.front() == ' '; sp.pop_front()) {
32 if (!sp.empty() && oddspace(sp.front())) {