C++ string_view::remove_suffix方法代码示例

ShaderMaster::ref
ShadingSystemImpl::loadshader (string_view cname)
{
    if (Strutil::ends_with (cname, ".oso"))
        cname.remove_suffix (4);   // strip superfluous .oso
    if (! cname.size()) {
        error ("Attempt to load shader with empty name \"\".");
        return NULL;
    }
    ++m_stat_shaders_requested;
    ustring name (cname);
    lock_guard guard (m_mutex);  // Thread safety
    ShaderNameMap::const_iterator found = m_shader_masters.find (name);
    if (found != m_shader_masters.end()) {
        // if (debug())
        //     info ("Found %s in shader_masters", name.c_str());
        // Already loaded this shader, return its reference
        return (*found).second;
    }

    // Not found in the map
    OSOReaderToMaster oso (*this);
    std::string filename = OIIO::Filesystem::searchpath_find (name.string() + ".oso",
                                                        m_searchpath_dirs);
    if (filename.empty ()) {
        error ("No .oso file could be found for shader \"%s\"", name.c_str());
        return NULL;
    }
    OIIO::Timer timer;
    bool ok = oso.parse_file (filename);
    ShaderMaster::ref r = ok ? oso.master() : nullptr;
    m_shader_masters[name] = r;
    double loadtime = timer();
    {
        spin_lock lock (m_stat_mutex);
        m_stat_master_load_time += loadtime;
    }
    if (ok) {
        ++m_stat_shaders_loaded;
        info ("Loaded \"%s\" (took %s)", filename.c_str(),
              Strutil::timeintervalformat(loadtime, 2).c_str());
        ASSERT (r);
        r->resolve_syms ();
        // if (debug()) {
        //     std::string s = r->print ();
        //     if (s.length())
        //         info ("%s", s.c_str());
        // }
    } else {
        error ("Unable to read \"%s\"", filename.c_str());
    }

    return r;
}

void rtrim(string_view& s) noexcept
{
  const auto pos = s.find_last_not_of(Space);
  s.remove_suffix(s.size() - (pos != string_view::npos ? pos + 1 : 0));
}

// Add the attribute -- figure out the type
void
parse_param(string_view paramname, string_view val, ImageSpec& spec)
{
    TypeDesc type;  // start out unknown

    // If the param string starts with a type name, that's what it is
    if (size_t typeportion = type.fromstring(paramname)) {
        paramname.remove_prefix(typeportion);
        Strutil::skip_whitespace(paramname);
    }
    // If the value string starts with a type name, that's what it is
    else if (size_t typeportion = type.fromstring(val)) {
        val.remove_prefix(typeportion);
        Strutil::skip_whitespace(val);
    }

    if (type.basetype == TypeDesc::UNKNOWN) {
        // If we didn't find a type name, try to guess
        if (val.size() >= 2 && val.front() == '\"' && val.back() == '\"') {
            // Surrounded by quotes? it's a string (strip off the quotes)
            val.remove_prefix(1);
            val.remove_suffix(1);
            type = TypeDesc::TypeString;
        } else if (Strutil::string_is<int>(val)) {
            // Looks like an int, is an int
            type = TypeDesc::TypeInt;
        } else if (Strutil::string_is<float>(val)) {
            // Looks like a float, is a float
            type = TypeDesc::TypeFloat;
        } else {
            // Everything else is assumed a string
            type = TypeDesc::TypeString;
        }
    }

    // Read the values and set the attribute
    int n = type.numelements() * type.aggregate;
    if (type.basetype == TypeDesc::INT) {
        std::vector<int> values(n);
        for (int i = 0; i < n; ++i) {
            Strutil::parse_int(val, values[i]);
            Strutil::parse_char(val, ',');  // optional
        }
        if (n > 0)
            spec.attribute(paramname, type, &values[0]);
    }
    if (type.basetype == TypeDesc::FLOAT) {
        std::vector<float> values(n);
        for (int i = 0; i < n; ++i) {
            Strutil::parse_float(val, values[i]);
            Strutil::parse_char(val, ',');  // optional
        }
        if (n > 0)
            spec.attribute(paramname, type, &values[0]);
    } else if (type.basetype == TypeDesc::STRING) {
        std::vector<ustring> values(n);
        for (int i = 0; i < n; ++i) {
            string_view v;
            Strutil::parse_string(val, v);
            Strutil::parse_char(val, ',');  // optional
            values[i] = v;
        }
        if (n > 0)
            spec.attribute(paramname, type, &values[0]);
    }
}