Function ParseScript

src/script/descriptor.cpp:2335–2756

Parse a script in a particular context. */ NOLINTNEXTLINE(misc-no-recursion)

/** Parse a script in a particular context. */
// NOLINTNEXTLINE(misc-no-recursion)
std::vector<std::unique_ptr<DescriptorImpl>> ParseScript(uint32_t& key_exp_index, std::span<const char>& sp, ParseScriptContext ctx, FlatSigningProvider& out, std::string& error)
{
    using namespace script;
    Assume(ctx == ParseScriptContext::TOP || ctx == ParseScriptContext::P2SH || ctx == ParseScriptContext::P2WSH || ctx == ParseScriptContext::P2TR);
    std::vector<std::unique_ptr<DescriptorImpl>> ret;
    auto expr = Expr(sp);
    if (Func("pk", expr)) {
        auto pubkeys = ParsePubkey(key_exp_index, expr, ctx, out, error);
        if (pubkeys.empty()) {
            error = strprintf("pk(): %s", error);
            return {};
        }
        for (auto& pubkey : pubkeys) {
            ret.emplace_back(std::make_unique<PKDescriptor>(std::move(pubkey), ctx == ParseScriptContext::P2TR));
        }
        return ret;
    }
    if ((ctx == ParseScriptContext::TOP || ctx == ParseScriptContext::P2SH || ctx == ParseScriptContext::P2WSH) && Func("pkh", expr)) {
        auto pubkeys = ParsePubkey(key_exp_index, expr, ctx, out, error);
        if (pubkeys.empty()) {
            error = strprintf("pkh(): %s", error);
            return {};
        }
        for (auto& pubkey : pubkeys) {
            ret.emplace_back(std::make_unique<PKHDescriptor>(std::move(pubkey)));
        }
        return ret;
    }
    if (ctx == ParseScriptContext::TOP && Func("combo", expr)) {
        auto pubkeys = ParsePubkey(key_exp_index, expr, ctx, out, error);
        if (pubkeys.empty()) {
            error = strprintf("combo(): %s", error);
            return {};
        }
        for (auto& pubkey : pubkeys) {
            ret.emplace_back(std::make_unique<ComboDescriptor>(std::move(pubkey)));
        }
        return ret;
    } else if (Func("combo", expr)) {
        error = "Can only have combo() at top level";
        return {};
    }
    const bool multi = Func("multi", expr);
    const bool sortedmulti = !multi && Func("sortedmulti", expr);
    const bool multi_a = !(multi || sortedmulti) && Func("multi_a", expr);
    const bool sortedmulti_a = !(multi || sortedmulti || multi_a) && Func("sortedmulti_a", expr);
    if (((ctx == ParseScriptContext::TOP || ctx == ParseScriptContext::P2SH || ctx == ParseScriptContext::P2WSH) && (multi || sortedmulti)) ||
        (ctx == ParseScriptContext::P2TR && (multi_a || sortedmulti_a))) {
        auto threshold = Expr(expr);
        uint32_t thres;
        std::vector<std::vector<std::unique_ptr<PubkeyProvider>>> providers; // List of multipath expanded pubkeys
        if (const auto maybe_thres{ToIntegral<uint32_t>(std::string_view{threshold.begin(), threshold.end()})}) {
            thres = *maybe_thres;
        } else {
            error = strprintf("Multi threshold '%s' is not valid", std::string(threshold.begin(), threshold.end()));
            return {};
        }
        size_t script_size = 0;