xchess/lib/meta-map.js

Chess Engine

export {MetaMap}

// import {PGNWriter} from '../pgn/writer.js'
import {INVALID_META_TAG, INVALID_META_VALUE} from './errors.js'

// const pgn = new PGNWriter();

function KEY(keyArg){
	const key = String(keyArg);
	if(/^[a-z0-9_]+$/i.test(key))
		return key;
	throw INVALID_META_TAG(key);
}

function VALUE(valueArg){
	const value = String(valueArg);
	if(value.includes('"'))
		throw INVALID_META_VALUE(value);
	return value;
}

class MetaMap extends Map {

	toString(){
		return this.pgn;
	}

	get pgn(){
		// pgn.headers(this);
		// return pgn.stream.release();
	}

	get(name){
		return super.get(String(name));
	}

	has(name){
		return super.has(String(name));
	}

	set(name, value){
		return super.set(KEY(name), VALUE(value));
	}

	delete(name){
		return super.delete(String(name));
	}
}