Function GetSetting

src/common/settings.cpp:154–209

}

SettingsValue GetSetting(const Settings& settings,
    const std::string& section,
    const std::string& name,
    bool ignore_default_section_config,
    bool ignore_nonpersistent,
    bool get_chain_type)
{
    SettingsValue result;
    bool done = false; // Done merging any more settings sources.
    MergeSettings(settings, section, name, [&](SettingsSpan span, Source source) {
        // Weird behavior preserved for backwards compatibility: Apply negated
        // setting even if non-negated setting would be ignored. A negated
        // value in the default section is applied to network specific options,
        // even though normal non-negated values there would be ignored.
        const bool never_ignore_negated_setting = span.last_negated();

        // Weird behavior preserved for backwards compatibility: Take first
        // assigned value instead of last. In general, later settings take
        // precedence over early settings, but for backwards compatibility in
        // the config file the precedence is reversed for all settings except
        // chain type settings.
        const bool reverse_precedence =
            (source == Source::CONFIG_FILE_NETWORK_SECTION || source == Source::CONFIG_FILE_DEFAULT_SECTION) &&
            !get_chain_type;

        // Weird behavior preserved for backwards compatibility: Negated
        // -regtest and -testnet arguments which you would expect to override
        // values set in the configuration file are currently accepted but
        // silently ignored. It would be better to apply these just like other
        // negated values, or at least warn they are ignored.
        const bool skip_negated_command_line = get_chain_type;

        if (done) return;

        // Ignore settings in default config section if requested.
        if (ignore_default_section_config && source == Source::CONFIG_FILE_DEFAULT_SECTION &&
            !never_ignore_negated_setting) {
            return;
        }

        // Ignore nonpersistent settings if requested.
        if (ignore_nonpersistent && (source == Source::COMMAND_LINE || source == Source::FORCED)) return;

        // Skip negated command line settings.
        if (skip_negated_command_line && span.last_negated()) return;

        if (!span.empty()) {
            result = reverse_precedence ? span.begin()[0] : span.end()[-1];
            done = true;
        } else if (span.last_negated()) {
            result = false;
            done = true;
        }
    });
    return result;
}

std::vector<SettingsValue> GetSettingsList(const Settings& settings,