// Copyright (c) 2021, OpenEmu Team
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the OpenEmu Team nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY OpenEmu Team ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL OpenEmu Team BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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import Foundation
import OpenEmuKitPrivate

extension PKVScanner {
    enum Error: Swift.Error {
        case malformed
    }
    
    static func parse<T: StringProtocol>(text: T) throws -> [(KVToken, String)] {
        let sc = Self()
        defer { kv_scanner_free(sc) }
        
        return try text.withFastUTF8IfAvailable { bp throws -> [(KVToken, String)] in
            sc.setData(bp.baseAddress!, length: bp.count)
            
            var tokens = [(KVToken, String)]()
            
            while true {
                let tok = sc.scan()
                guard tok != .error else { throw Error.malformed }
                guard tok != .eof else { break }
                tokens.append((tok, String(sc.text)))
            }
            
            return tokens
        }
    }
}