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;
}
 
} // namespace spanparsing