prosperon/source/scripts/diff.js

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function deep_copy(from) {
if (typeof from !== 'object')
return from;
if (Array.isArray(from)) {
var c = [];
from.forEach(function(x,i) { c[i] = deep_copy(x); });
return c;
}
var obj = {};
for (var key in from)
obj[key] = deep_copy(from[key]);
return obj;
};
var walk_up_get_prop = function(obj, prop, endobj) {
var props = [];
var cur = obj;
while (cur !== Object.prototype) {
if (cur.hasOwn(prop))
props.push(cur[prop]);
cur = cur.__proto__;
}
return props;
};
function complete_assign(target, source) {
var descriptors = {};
var assigns = {};
if (typeof source === 'undefined') return target;
Object.keys(source).forEach(function (k) {
var desc = Object.getOwnPropertyDescriptor(source, k);
if (desc.value) {
if (typeof desc.value === 'object' && desc.value.hasOwn('value'))
descriptors[k] = desc.value;
else
assigns[k] = desc.value;
} else
descriptors[k] = desc;
});
Object.defineProperties(target, descriptors);
Object.assign(target, assigns);
return target;
};
/* Assigns properties from source to target, only if they exist in target */
function dainty_assign(target, source)
{
for (var key in source) {
if (typeof source[key] === 'function') {
target[key] = source[key];
continue;
}
if (!(key in target)) continue;
if (Array.isArray(target[key]))
target[key] = source[key];
else if (typeof target[key] === 'object')
dainty_assign(target[key], source[key]);
else
target[key] = source[key];
}
};
/* Deeply remove source keys from target, not removing objects */
function unmerge(target, source) {
for (var key in source) {
if (typeof source[key] === 'object' && !Array.isArray(source[key]))
unmerge(target[key], source[key]);
else
delete target[key];
}
};
/* Deeply merge two objects, not clobbering objects on target with objects on source */
function deep_merge(target, source)
{
for (var key in source) {
if (typeof source[key] === 'object' && !Array.isArray(source[key]))
deep_merge(target[key], source[key]);
else
target[key] = source[key];
}
};
function equal(x,y) {
if (typeof x === 'object')
for (var key in x)
return equal(x[key],y[key]);
return x === y;
};
function diffassign(target, from) {
if (from.empty) return;
for (var e in from) {
if (typeof from[e] === 'object') {
if (!target.hasOwnProperty(e))
target[e] = from[e];
else
diffassign(target[e], from[e]);
} else {
if (from[e] === "DELETE") {
delete target[e];
} else {
target[e] = from[e];
}
}
}
};
function diff(from, to) {
var obj = {};
for (var e in to) {
if (typeof to[e] === 'object' && from.hasOwnProperty(e)) {
obj[e] = diff(from[e], to[e]);
if (obj[e].empty)
delete obj[e];
} else {
if (from[e] !== to[e])
obj[e] = to[e];
}
}
for (var e in from) {
if (!to.hasOwnProperty(e))
obj[e] = "DELETE";
}
return obj;
};