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var untilde = function(str) {
return str.replace(/~./g, function(m) {
switch (m) {
case "~0":
return "~";
case "~1":
return "/";
}
throw new Error("Invalid tilde escape: " + m);
});
}
var traverse = function(obj, pointer, value) {
// assert(isArray(pointer))
var part = untilde(pointer.shift());
if(!obj.hasOwnProperty(part)) {
return null;
}
if(pointer.length !== 0) { // keep traversin!
return traverse(obj[part], pointer, value);
}
// we're done
if(typeof value === "undefined") {
// just reading
return obj[part];
}
// set new value, return old value
var old_value = obj[part];
if(value === null) {
delete obj[part];
} else {
obj[part] = value;
}
return old_value;
}
var validate_input = function(obj, pointer) {
if(typeof obj !== "object") {
throw new Error("Invalid input object.");
}
if(pointer === "") {
return [];
}
if(!pointer) {
throw new Error("Invalid JSON pointer.");
}
pointer = pointer.split("/");
var first = pointer.shift();
if (first !== "") {
throw new Error("Invalid JSON pointer.");
}
return pointer;
}
var get = function(obj, pointer) {
pointer = validate_input(obj, pointer);
if (pointer.length === 0) {
return obj;
}
return traverse(obj, pointer);
}
var set = function(obj, pointer, value) {
pointer = validate_input(obj, pointer);
if (pointer.length === 0) {
throw new Error("Invalid JSON pointer for set.")
}
return traverse(obj, pointer, value);
}
exports.get = get
exports.set = set
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