Function parseCommand

bililiteRange.ex.js:167–217

(command, defaultaddress)

const idRE = /^\s*([!=&~><]|[a-zA-Z]+)/; 

function parseCommand(command, defaultaddress){
	return {
		addresses: parseAddresses(),
		command: commandCompletion(parseCommandWord()),
		variant: parseVariant(),
		parameter: parseParameter()
	};
	
	function parseAddresses(){
		var addresses = [defaultaddress];
		// basic addresses
		command = command.replace(addressRE, function(match, c){
			addresses = [c];
			return '';
		});
		// relative addresses
		command = command.replace(/^\s*[-+\d]+/, function (match){
			addresses[0] += match;
			return '';
		});
		// a comma separates addresses
		if (/^\s*[,;]\s*/.test(command)){
			if (/^\s*;/.test(command)) addresses.push(';'); // need to track semicolons since they change the value of '.'
			command = command.replace(/^\s*[,;]\s*/, '');
			addresses.push.apply(addresses, parseAddresses()); // recursively parse the whole list
		}
		return addresses;
	}

	function parseCommandWord(){
		if (/^\s*$/.test(command)) return 'print'; // blank line just goes to the addressed line, which is what we do with print
		var ret;
		command = command.replace(idRE, function (match, c){
			ret = c;
			return '';
		});
		if (!ret) throw new Error("No command string");
		return ret;
	}
	function parseVariant(){
		var variant = false;
		command = command.replace(/^\s*!/, function (){
			variant = true;
			return '';
		});
		return variant;
	}
	function parseParameter(){
		return (string(command));
	}
}

function string(text){
	// we use JSON strings if it is necessary to include special characters