mirror of
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58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
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* Copyright 2016 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/String.h>
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namespace folly {
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static inline bool is_oddspace(char c) {
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return c == '\n' || c == '\t' || c == '\r';
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}
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StringPiece ltrimWhitespace(StringPiece sp) {
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// Spaces other than ' ' characters are less common but should be
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// checked. This configuration where we loop on the ' '
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// separately from oddspaces was empirically fastest.
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loop:
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for (; !sp.empty() && sp.front() == ' '; sp.pop_front()) {
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}
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if (!sp.empty() && is_oddspace(sp.front())) {
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sp.pop_front();
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goto loop;
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}
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return sp;
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}
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StringPiece rtrimWhitespace(StringPiece sp) {
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// Spaces other than ' ' characters are less common but should be
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// checked. This configuration where we loop on the ' '
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// separately from oddspaces was empirically fastest.
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loop:
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for (; !sp.empty() && sp.back() == ' '; sp.pop_back()) {
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}
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if (!sp.empty() && is_oddspace(sp.back())) {
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sp.pop_back();
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goto loop;
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}
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return sp;
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}
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}
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