From c83e3eba10930373bdade606d6d54fb5615cbe74 Mon Sep 17 00:00:00 2001
From: Timo Koch <timo.koch@iws.uni-stuttgart.de>
Date: Thu, 3 Dec 2020 15:18:18 +0100
Subject: [PATCH] [common][string] Implement split function for splitting
strings
---
dumux/common/stringutilities.hh | 35 +++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/dumux/common/stringutilities.hh b/dumux/common/stringutilities.hh
index 21f05661f8..60cd68f990 100644
--- a/dumux/common/stringutilities.hh
+++ b/dumux/common/stringutilities.hh
@@ -60,6 +60,41 @@ std::vector<std::string_view> tokenize(std::string_view str, std::string_view de
return tokens;
}
+/*
+ * \brief Split a string at a given seperator string
+ * \ingroup Common
+ * \param str a string to be split
+ * \param delim a set of delimiter characters separating the tokens
+ * \param removeEmpty if empty string between two separator should be removed from the result
+ * \note this works without copying the original string, make sure that string
+ * does not go out of scope!
+ *
+ * Examples:
+ * - split("| Hello | world |", "|") -> {"", " Hello ", " world ", ""}
+ * - split("| Hello | world |", "|", true) -> {" Hello ", " world "}
+ * - split("blafoobla", "foo") -> {"bla", "bla"}
+ * - split("blafoobla", "bla") -> {"", "foo", ""}
+ * - split("blafoobla", "bla", true) -> {"foo"}
+ */
+std::vector<std::string_view> split(std::string_view str, std::string_view delim, bool removeEmpty = false)
+{
+ const auto token = [&](std::size_t pos){
+ const auto end = str.find(delim, pos);
+ return std::make_pair(pos, end);
+ };
+
+ std::vector<std::string_view> split;
+ for (auto [start, end] = token(0); start != std::string::npos; std::tie(start, end) = token(start))
+ {
+ if (auto&& sub = str.substr(start, end-start); !removeEmpty || !sub.empty())
+ split.emplace_back(std::move(sub));
+
+ // skip to after the delimiter
+ start = (end != std::string::npos) ? end + delim.size() : end;
+ }
+ return split;
+}
+
} // end namespace Dumux
#endif
--
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