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modelOperations.js
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modelOperations.js
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var memoiseCache = {};
// Lots of similarities between get and set, refactor later to reuse code.
function get(path, model) {
if (!path) {
return model;
}
var memoiseObject = memoiseCache[path];
if(memoiseObject && memoiseObject.model === model){
return memoiseObject.value;
}
var pathParts = path.split('.'),
reference = model,
index = 0,
pathLength = pathParts.length;
for(; index < pathLength; index++){
var key = pathParts[index];
if (reference == null) {
break;
} else if (typeof reference[key] === "object") {
reference = reference[key];
} else {
reference = reference[key];
// If there are still keys in the path that have not been accessed,
// return undefined.
if(index < pathLength - 1){
reference = undefined;
}
break;
}
}
memoiseCache[path] = {
model: model,
value: reference
};
return reference;
}
function overwriteModel(replacement, model){
if(replacement === model){
return;
}
for (var modelProp in model) {
delete model[modelProp];
}
for (var replacementProp in replacement) {
model[replacementProp] = replacement[replacementProp];
}
}
function set(path, value, model) {
// passed a null or undefined path, do nothing.
if (!path) {
return;
}
memoiseCache = {};
// If you just pass in an object, you are overwriting the model.
if (typeof path === "object") {
value = path;
path = paths.createRoot();
}
var pathParts = path.split('.'),
index = 0,
pathLength = pathParts.length;
var reference = model,
keysChanged;
for(; index < pathLength; index++){
var key = pathParts[index];
// if we have hit a non-object property on the reference and we have more keys after this one
// make an object (or array) here and move on.
if ((typeof reference[key] !== "object" || reference[key] === null) && index < pathLength - 1) {
if (!isNaN(key)) {
reference[key] = [];
}
else {
reference[key] = {};
}
}
if (index === pathLength - 1) {
// if we are at the end of the line, set to the model
if(!(key in reference)){
keysChanged = true;
}
reference[key] = value;
}
//otherwise, dig deeper
else {
reference = reference[key];
}
}
return keysChanged;
}
module.exports = {
get: get,
set: set
};