validate an object by the presence of it's properties

gistfile1.txt

function validateObjStructure(obj, structure) {
	if (structure.length > 0)
		while (structure[0] == '.')
			structure = structure.substr(1)
	console.log('Call:', JSON.stringify(obj), structure)

	var dot = structure.indexOf('.')
	var bracket = structure.indexOf('[')
	var prop;
	if (dot === -1 && bracket === -1) { // a
		console.log('A-')
		return obj.hasOwnProperty(structure);
	}  else {  // a.b[ or a[].b
		console.log('B-')
		if (dot === -1) dot = structure.length + 1
		if (bracket === -1) bracket = structure.length + 1
		var smallest = dot < bracket ? dot : bracket;

		if (smallest == dot) { // a.
			prop = structure.substr(0, dot);
			console.log('B-A prop:', prop)
			return validateObjStructure(obj[prop], structure.substr(dot+1));
		} else {
			var endBracket = structure.indexOf(']')
			if (bracket === 0) { // [
				prop = structure.substr(bracket+1, endBracket-bracket-1)
				console.log('p1', prop, prop.length)
				if (prop.length === 0)
					prop = 0;
				console.log('B-B prop:', prop, obj) // [
				return validateObjStructure(obj[prop], structure.substr(endBracket+2));
			}  else { // a[
				prop = structure.substr(0, bracket)
				console.log('B-C prop:', prop, obj) // a[
				return validateObjStructure(obj[prop], structure.substr(bracket));
			}
		}
	}
}

//var positiveTestCases = {
//    'a': {a:1},
//    'a.b': {a: {b:1} },
//     'b[].c': {a:1, b:[{c:1}]},
//     'b[1].c': {a:1, b:[{d:1},{c:1}]}
//};

//for (var testCase in positiveTestCases) {
//    console.log(testCase, validateObjStructure(positiveTestCases[testCase], testCase) === true);
//}