/*
 * Copyright (c) 2014 Fredy Wijaya
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include "PropertiesUtils.h"

namespace cppproperties {
namespace PropertiesUtils {

namespace {
const std::string TRIM_DELIMITERS = " \f\n\r\t\v";
std::string ltrim(const std::string& str) {
    std::string::size_type s = str.find_first_not_of(TRIM_DELIMITERS);
    if (s == std::string::npos) {
        return "";
    }
    return str.substr(s);
}
}

std::string RightTrim(const std::string& str) {
    std::string::size_type s = str.find_last_not_of(TRIM_DELIMITERS);
    if (s == std::string::npos) {
        return "";
    }
    return str.substr(0, s+1);
}

std::string LeftTrim(const std::string& str) {
    std::string rstr = ltrim(str);

    while (rstr != ltrim(rstr)) {
        rstr = ltrim(rstr);
    }

    return rstr;
}

std::string Trim(const std::string& str) {
    return RightTrim(LeftTrim(str));
}

bool IsProperty(const std::string& str) {
    std::string trimmedStr = LeftTrim(str);
    std::string::size_type s = trimmedStr.find_first_of("=");
    if (s == std::string::npos) {
        return false;
    }
    std::string key = Trim(trimmedStr.substr(0, s));
    // key can't be empty
    if (key == "") {
        return false;
    }
    return true;
}

std::pair<std::string, std::string> ParseProperty(const std::string& str) {
    std::string trimmedStr = LeftTrim(str);
    std::string::size_type s = trimmedStr.find_first_of("=");
    std::string key = Trim(trimmedStr.substr(0, s));
    std::string value = LeftTrim(trimmedStr.substr(s+1));

    return std::pair<std::string, std::string>(key, value);
}

bool IsComment(const std::string& str) {
    std::string trimmedStr = LeftTrim(str);
    return trimmedStr[0] == '#';
}

bool IsEmptyLine(const std::string& str) {
    std::string trimmedStr = LeftTrim(str);
    return trimmedStr == "";
}

} // namespace PropertiesUtils
} // namespace cppproperties