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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.

				#include <util/spanparsing.h>

				#include <span.h>

				#include <string>
				#include <vector>

				namespace spanparsing {

				bool Const(const std::string &str, Span<const char> &sp) {
				if (size_t(sp.size()) >= str.size() &&
				std::equal(str.begin(), str.end(), sp.begin())) {
				sp = sp.subspan(str.size());
				return true;
				}
				return false;
				}

				bool Func(const std::string &str, Span<const char> &sp) {
				if (size_t(sp.size()) >= str.size() + 2 && sp[str.size()] == '(' &&
				sp[sp.size() - 1] == ')' &&
				std::equal(str.begin(), str.end(), sp.begin())) {
				sp = sp.subspan(str.size() + 1, sp.size() - str.size() - 2);
				return true;
				}
				return false;
				}

				Span<const char> Expr(Span<const char> &sp) {
				int level = 0;
				auto it = sp.begin();
				while (it != sp.end()) {
				if (*it == '(') {
				++level;
				} else if (level && *it == ')') {
				--level;
				} else if (level == 0 && (it == ')' \|\| it == ',')) {
				break;
				}
				++it;
				}
				Span<const char> ret = sp.first(it - sp.begin());
				sp = sp.subspan(it - sp.begin());
				return ret;
				}

				std::vector<Span<const char>> Split(const Span<const char> &sp, char sep) {
				std::vector<Span<const char>> ret;
				auto it = sp.begin();
				auto start = it;
				while (it != sp.end()) {
				if (*it == sep) {
				ret.emplace_back(start, it);
				start = it + 1;
				}
				++it;
				}
				ret.emplace_back(start, it);
				return ret;
				}

				} // namespace spanparsing