Abstract out some of the descriptor Span-parsing helpers

1 files changed, 29 insertions, 0 deletions

diff --git a/src/util/spanparsing.h b/src/util/spanparsing.h
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index 0000000000..a2eb24b1fb
--- /dev/null
+++ b/src/util/spanparsing.h
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+// Copyright (c) 2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_SPANPARSING_H
+#define BITCOIN_UTIL_SPANPARSING_H
+
+#include <span.h>
+
+#include <string>
+#include <vector>
+
+namespace spanparsing {
+
+/** Parse a constant. If successful, sp is updated to skip the constant and return true. */
+bool Const(const std::string& str, Span<const char>& sp);
+
+/** Parse a function call. If successful, sp is updated to be the function's argument(s). */
+bool Func(const std::string& str, Span<const char>& sp);
+
+/** Return the expression that sp begins with, and update sp to skip it. */
+Span<const char> Expr(Span<const char>& sp);
+
+/** Split a string on every instance of sep, returning a vector. */
+std::vector<Span<const char>> Split(const Span<const char>& sp, char sep);
+
+} // namespace spanparsing
+
+#endif // BITCOIN_UTIL_SPANPARSING_H