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// Copyright (c) 2018-2019 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 <string_view>
#include <vector>
namespace spanparsing {
/** Parse a constant.
*
* If sp's initial part matches str, sp is updated to skip that part, and true is returned.
* Otherwise sp is unmodified and false is returned.
*/
bool Const(const std::string& str, Span<const char>& sp);
/** Parse a function call.
*
* If sp's initial part matches str + "(", and sp ends with ")", sp is updated to be the
* section between the braces, and true is returned. Otherwise sp is unmodified and false
* is returned.
*/
bool Func(const std::string& str, Span<const char>& sp);
/** Extract the expression that sp begins with.
*
* This function will return the initial part of sp, up to (but not including) the first
* comma or closing brace, skipping ones that are surrounded by braces. So for example,
* for "foo(bar(1),2),3" the initial part "foo(bar(1),2)" will be returned. sp will be
* updated to skip the initial part that is returned.
*/
Span<const char> Expr(Span<const char>& sp);
/** Split a string on any char found in separators, returning a vector.
*
* If sep does not occur in sp, a singleton with the entirety of sp is returned.
*
* Note that this function does not care about braces, so splitting
* "foo(bar(1),2),3) on ',' will return {"foo(bar(1)", "2)", "3)"}.
*/
template <typename T = Span<const char>>
std::vector<T> Split(const Span<const char>& sp, std::string_view separators)
{
std::vector<T> ret;
auto it = sp.begin();
auto start = it;
while (it != sp.end()) {
if (separators.find(*it) != std::string::npos) {
ret.emplace_back(start, it);
start = it + 1;
}
++it;
}
ret.emplace_back(start, it);
return ret;
}
/** Split a string on every instance of sep, returning a vector.
*
* If sep does not occur in sp, a singleton with the entirety of sp is returned.
*
* Note that this function does not care about braces, so splitting
* "foo(bar(1),2),3) on ',' will return {"foo(bar(1)", "2)", "3)"}.
*/
template <typename T = Span<const char>>
std::vector<T> Split(const Span<const char>& sp, char sep)
{
return Split<T>(sp, std::string_view{&sep, 1});
}
} // namespace spanparsing
#endif // BITCOIN_UTIL_SPANPARSING_H
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