1 /**

     2  * ShaderShark

     3  * Copyright © 2023 František Kučera (Frantovo.cz, GlobalCode.info)

     4  *

     5  * This program is free software: you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation, version 3 of the License.

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

    12  * GNU General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU General Public License

    15  * along with this program. If not, see <http://www.gnu.org/licenses/>.

    16  */

    17 

    18 #pragma once

    19 

    20 #include <vector>

    21 #include <string>

    22 

    23 #include "Configuration.h"

    24 

    25 class CLIParser {

    26 private:

    27 

    28 	static const std::string OPTION_TEXTURE;

    29 	static const std::string OPTION_BACKGROUND_COLOR;

    30 	static const std::string OPTION_ROOT_WINDOW;

    31 

    32 	const std::string

    33 	readNext(const std::vector<std::string>& arguments, int& i) {

    34 		if (i < arguments.size()) return arguments[i++];

    35 		else throw std::logic_error("Missing CLI argument"

    36 				+ (i > 0 ? (" after " + arguments[i - 1]) : ""));

    37 	}

    38 

    39 	bool parseBoolean(const std::string& value) {

    40 		if (value == "true") return true;

    41 		else if (value == "false") return false;

    42 		else throw std::logic_error("Unable to parse boolean value: "

    43 				+ value + " (expecting true or false)");

    44 	}

    45 

    46 	unsigned long

    47 	parseHexColor(const std::string& hex) {

    48 		int r, g, b;

    49 		int count = sscanf(hex.c_str(), "%02x%02x%02x", &r, &g, &b);

    50 		if (count == 3) {

    51 			unsigned long lr, lg, lb;

    52 			lr = r;

    53 			lg = g;

    54 			lb = b;

    55 			return (lr << 16 | lg << 8 | lb);

    56 		} else {

    57 			throw std::logic_error("Invalid hex color string");

    58 		}

    59 	}

    60 

    61 public:

    62 

    63 	const Configuration parse(const std::vector<std::string>& arguments) {

    64 		Configuration c;

    65 

    66 		for (int i = 0; i < arguments.size();) {

    67 			const std::string& option = readNext(arguments, i);

    68 

    69 			if (option == OPTION_TEXTURE) {

    70 				Configuration::Texture tex;

    71 				tex.fileName = readNext(arguments, i);

    72 				c.textures.push_back(tex);

    73 			} else if (option == OPTION_BACKGROUND_COLOR) {

    74 				c.backgroundColor = parseHexColor(readNext(arguments, i));

    75 			} else if (option == OPTION_ROOT_WINDOW) {

    76 				c.rootWindow = std::stoul(readNext(arguments, i));

    77 			} else throw std::logic_error("Unsupported CLI option: " + option);

    78 		}

    79 

    80 		return c;

    81 	}

    82 };

    83 

    84 const std::string CLIParser::OPTION_TEXTURE = "--texture";

    85 const std::string CLIParser::OPTION_BACKGROUND_COLOR = "--background-color";

    86 const std::string CLIParser::OPTION_ROOT_WINDOW = "--root-window";