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|---|---|---|---|
| 1 | // -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | ||
| 2 | // vi: set et ts=4 sw=4 sts=4: | ||
| 3 | // | ||
| 4 | // SPDX-FileCopyrightInfo: Copyright © DuMux Project contributors, see AUTHORS.md in root folder | ||
| 5 | // SPDX-License-Identifier: GPL-3.0-or-later | ||
| 6 | // | ||
| 7 | |||
| 8 | /*! | ||
| 9 | * \file | ||
| 10 | * \ingroup Core | ||
| 11 | * \brief Helpers for working with strings | ||
| 12 | */ | ||
| 13 | |||
| 14 | #ifndef DUMUX_COMMON_STRING_UTILITIES_HH | ||
| 15 | #define DUMUX_COMMON_STRING_UTILITIES_HH | ||
| 16 | |||
| 17 | #include <vector> | ||
| 18 | #include <string> | ||
| 19 | #include <string_view> | ||
| 20 | #include <tuple> | ||
| 21 | |||
| 22 | namespace Dumux { | ||
| 23 | |||
| 24 | /* | ||
| 25 | * \brief Tokenize a string splitting at a given delimiter | ||
| 26 | * \ingroup Core | ||
| 27 | * \param str a string to be tokenized | ||
| 28 | * \param delim a set of delimiter characters separating the tokens | ||
| 29 | * \note this works without copying the original string, make sure that string | ||
| 30 | * does not go out of scope! | ||
| 31 | * \note The delimiter characters cannot appear within any of the tokens | ||
| 32 | * | ||
| 33 | * Examples: | ||
| 34 | * - tokenize("bla&foo&&&bar", "&") -> {"bla", "foo", "bar"} | ||
| 35 | * - tokenize(" a b ", " ") -> {"a", "b"} | ||
| 36 | * - tokenize(str, " \n\t") -> split at whitespace (and removes all whitespace) | ||
| 37 | */ | ||
| 38 | 31 | std::vector<std::string_view> tokenize(std::string_view str, std::string_view delim) | |
| 39 | { | ||
| 40 | 213 | const auto token = [&](std::size_t pos){ | |
| 41 | 182 | const auto start = str.find_first_not_of(delim, pos); | |
| 42 | 182 | const auto end = str.find_first_of(delim, start); | |
| 43 | 364 | return std::make_pair(start, end); | |
| 44 | 213 | }; | |
| 45 | |||
| 46 | 31 | std::vector<std::string_view> tokens; | |
| 47 |
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273 | for (auto [start, end] = token(0); start != end; std::tie(start, end) = token(end)) |
| 48 |
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60 | tokens.emplace_back(str.substr(start, end-start)); |
| 49 | 31 | return tokens; | |
| 50 | } | ||
| 51 | |||
| 52 | /* | ||
| 53 | * \brief Split a string at a given separator string | ||
| 54 | * \ingroup Core | ||
| 55 | * \param str a string to be split | ||
| 56 | * \param delim a set of delimiter characters separating the tokens | ||
| 57 | * \param removeEmpty if empty string between two separator should be removed from the result | ||
| 58 | * \note this works without copying the original string, make sure that string | ||
| 59 | * does not go out of scope! | ||
| 60 | * | ||
| 61 | * Examples: | ||
| 62 | * - split("| Hello | world |", "|") -> {"", " Hello ", " world ", ""} | ||
| 63 | * - split("| Hello | world |", "|", true) -> {" Hello ", " world "} | ||
| 64 | * - split("blafoobla", "foo") -> {"bla", "bla"} | ||
| 65 | * - split("blafoobla", "bla") -> {"", "foo", ""} | ||
| 66 | * - split("blafoobla", "bla", true) -> {"foo"} | ||
| 67 | */ | ||
| 68 | 92 | std::vector<std::string_view> split(std::string_view str, std::string_view delim, bool removeEmpty = false) | |
| 69 | { | ||
| 70 | 92 | const auto token = [&](std::size_t pos){ | |
| 71 | ✗ | const auto end = str.find(delim, pos); | |
| 72 | 279 | return std::make_pair(pos, end); | |
| 73 | 279 | }; | |
| 74 | |||
| 75 | 92 | std::vector<std::string_view> split; | |
| 76 |
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653 | for (auto [start, end] = token(0); start != std::string::npos; std::tie(start, end) = token(start)) |
| 77 | { | ||
| 78 |
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187 | if (auto&& sub = str.substr(start, end-start); !removeEmpty || !sub.empty()) |
| 79 |
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185 | split.emplace_back(std::move(sub)); |
| 80 | |||
| 81 | // skip to after the delimiter | ||
| 82 |
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187 | start = (end != std::string::npos) ? end + delim.size() : end; |
| 83 | } | ||
| 84 | 92 | return split; | |
| 85 | } | ||
| 86 | |||
| 87 | } // end namespace Dumux | ||
| 88 | |||
| 89 | #endif | ||
| 90 |