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// Copyright (c) 2018-2021 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 <algorithm>
#include <cstddef>
#include <string>
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 == '(' || *it == '{') {
++level;
} else if (level && (*it == ')' || *it == '}')) {
--level;
} else if (level == 0 && (*it == ')' || *it == '}' || *it == ',')) {
break;
}
++it;
}
Span<const char> ret = sp.first(it - sp.begin());
sp = sp.subspan(it - sp.begin());
return ret;
}
} // namespace spanparsing
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