73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
var traverse = require('traverse');
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var objectKeys = require('./keys');
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var forEach = require('./foreach');
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function indexOf (xs, x) {
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if (xs.indexOf) return xs.indexOf(x);
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for (var i = 0; i < xs.length; i++) if (xs[i] === x) return i;
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return -1;
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}
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// scrub callbacks out of requests in order to call them again later
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module.exports = function (callbacks) {
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return new Scrubber(callbacks);
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};
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function Scrubber (callbacks) {
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this.callbacks = callbacks;
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}
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// Take the functions out and note them for future use
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Scrubber.prototype.scrub = function (obj) {
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var self = this;
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var paths = {};
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var links = [];
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var args = traverse(obj).map(function (node) {
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if (typeof node === 'function') {
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var i = indexOf(self.callbacks, node);
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if (i >= 0 && !(i in paths)) {
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// Keep previous function IDs only for the first function
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// found. This is somewhat suboptimal but the alternatives
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// are worse.
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paths[i] = this.path;
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}
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else {
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var id = self.callbacks.length;
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self.callbacks.push(node);
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paths[id] = this.path;
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}
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this.update('[Function]');
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}
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else if (this.circular) {
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links.push({ from : this.circular.path, to : this.path });
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this.update('[Circular]');
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}
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});
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return {
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arguments : args,
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callbacks : paths,
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links : links
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};
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};
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// Replace callbacks. The supplied function should take a callback id and
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// return a callback of its own.
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Scrubber.prototype.unscrub = function (msg, f) {
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var args = msg.arguments || [];
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forEach(objectKeys(msg.callbacks || {}), function (sid) {
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var id = parseInt(sid, 10);
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var path = msg.callbacks[id];
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traverse.set(args, path, f(id));
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});
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forEach(msg.links || [], function (link) {
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var value = traverse.get(args, link.from);
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traverse.set(args, link.to, value);
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});
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return args;
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};
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