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Diffstat (limited to 'src/base/string_utils.h')
-rw-r--r-- | src/base/string_utils.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/base/string_utils.h b/src/base/string_utils.h new file mode 100644 index 0000000..c450b27 --- /dev/null +++ b/src/base/string_utils.h @@ -0,0 +1,68 @@ +// Copyright 2018 Google LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#ifndef ASTC_CODEC_BASE_STRING_UTILS_H_ +#define ASTC_CODEC_BASE_STRING_UTILS_H_ + +#include <limits> +#include <string> + +namespace astc_codec { +namespace base { + +// Iterates over a string's parts using |splitBy| as a delimiter. +// |splitBy| must be a nonempty string well, or it's a no-op. +// Otherwise, |func| is called on each of the splits, excluding the +// characters that are part of |splitBy|. If two |splitBy|'s occur in a row, +// |func| will be called on a StringView("") in between. See +// StringUtils_unittest.cpp for the full story. +template<class Func> +void Split(const std::string& str, const std::string& splitBy, Func func) { + if (splitBy.empty()) { + return; + } + + size_t splitSize = splitBy.size(); + size_t begin = 0; + size_t end = str.find(splitBy); + + while (true) { + func(str.substr(begin, end - begin)); + if (end == std::string::npos) { + return; + } + + begin = end + splitSize; + end = str.find(splitBy, begin); + } +} + +static int32_t ParseInt32(const char* str, int32_t deflt) { + using std::numeric_limits; + + char* error = nullptr; + int64_t value = strtol(str, &error, 0); + // Limit long values to int32 min/max. Needed for lp64; no-op on 32 bits. + if (value > std::numeric_limits<int32_t>::max()) { + value = std::numeric_limits<int32_t>::max(); + } else if (value < std::numeric_limits<int32_t>::min()) { + value = std::numeric_limits<int32_t>::min(); + } + return (error == str) ? deflt : static_cast<int32_t>(value); +} + +} // namespace base +} // namespace astc_codec + +#endif // ASTC_CODEC_BASE_STRING_UTILS_H_ |