spanparsing.cpp
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spanparsing.cpp
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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