// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

// This file is copied from

// https://github.com/ClickHouse/ClickHouse/blob/master/src/Functions/URL/protocol.h

// and modified by Doris

#pragma once

#include "exec/common/string_utils/string_utils.h"

#include "exprs/function/url/functions_url.h"

namespace doris {

/// Extracts scheme from given url.

inline StringRef get_url_scheme(const char* data, size_t size) {

    // scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )

    const char* pos = data;

    const char* end = data + size;

    if (is_alpha_ascii(*pos)) {

        for (++pos; pos < end; ++pos) {

            if (!(is_alpha_numeric_ascii(*pos) || *pos == '+' || *pos == '-' || *pos == '.')) {

                break;

            }

        }

        return StringRef(data, pos - data);

    }

    return {};

}

struct ExtractProtocol {

    static size_t get_reserve_length_for_element() { return strlen("https") + 1; }

    static void execute(Pos data, size_t size, Pos& res_data, size_t& res_size) {

        res_data = data;

        res_size = 0;

        StringRef scheme = get_url_scheme(data, size);

        Pos pos = data + scheme.size;

        if (scheme.size == 0 || (data + size) - pos < 4) return;

        if (pos[0] == ':') res_size = pos - data;

    }

};

} // namespace doris