From bf61871271971aa45237fb9ba7fa4c63ae083ff2 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Mon, 20 Jul 2020 17:42:34 +0000
Subject: parser.hh -> split.hh

---
 src/libutil/split.hh | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 src/libutil/split.hh

(limited to 'src/libutil/split.hh')

diff --git a/src/libutil/split.hh b/src/libutil/split.hh
new file mode 100644
index 000000000..d19d7d8ed
--- /dev/null
+++ b/src/libutil/split.hh
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <optional>
+#include <string_view>
+
+#include "util.hh"
+
+namespace nix {
+
+// If `separator` is found, we return the portion of the string before the
+// separator, and modify the string argument to contain only the part after the
+// separator. Otherwise, wer return `std::nullopt`, and we leave the argument
+// string alone.
+static inline std::optional<std::string_view> splitPrefixTo(std::string_view & string, char separator) {
+    auto sepInstance = string.find(separator);
+
+    if (sepInstance != std::string_view::npos) {
+        auto prefix = string.substr(0, sepInstance);
+        string.remove_prefix(sepInstance+1);
+        return prefix;
+    }
+
+    return std::nullopt;
+}
+
+static inline bool splitPrefix(std::string_view & string, std::string_view prefix) {
+    bool res = hasPrefix(string, prefix);
+    if (res)
+        string.remove_prefix(prefix.length());
+    return res;
+}
+
+}
-- 
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