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/* "Optimizes" nodes and edges by dropping uninteresting ones. (for example,
* nodes with no edges).
*/
/* jshint devel:true */
'use strict';
/* find user nodes and remove invalid edges */
function filterEdges(data, ratelimit_max) {
// map userID to nodes
var users = {};
data.nodes.forEach(function (user, i) {
users[user.group] = user;
});
var ratelimit_count = 0;
function ratelimit() {
return ++ratelimit_count <= ratelimit_max;
}
// filter away invalid edges
data.edges = data.edges.filter(function (link, i) {
var invalid = false;
if (!(link.source in users)) {
if (ratelimit()) console.warn('Dropping invalid source user',
link.source, 'at line', (i + 1), link);
invalid = true;
}
if (!(link.target in users)) {
if (ratelimit()) console.warn('Dropping invalid target user',
link.target, 'at line', (i + 1), link);
invalid = true;
}
if (link.source === link.target) {
if (ratelimit()) console.warn('Dropping self-referencing user',
link.target, 'at line', (i + 1), link);
invalid = true;
}
return !invalid;
});
if (ratelimit_max > 0 && ratelimit_count > ratelimit_max) {
console.log('Supressed', ratelimit_count, 'messages');
}
}
function preprocess(data, options) {
console.log('Initial nodes count:', data.nodes.length);
console.log('Initial edges count:', data.edges.length);
filterEdges(data, 10);
console.log('Valid edges count:', data.edges.length);
if (options.minTweetCount > 0) {
/* filter away users with almost no tweets */
data.nodes = data.nodes.filter(function (node) {
return node.tweetCount >= options.minTweetCount;
});
console.log('Nodes count (ignoring users with fewer than',
options.minTweetCount, 'tweets):', data.nodes.length);
filterEdges(data, 0);
}
// find all related users by userID
var hasRelations = {};
data.edges.forEach(function (link) {
hasRelations[link.target] = 1;
hasRelations[link.source] = 1;
});
if (options.kill_loners) {
var hasRelated = {};
data.nodes = data.nodes.filter(function (d) {
return d.group in hasRelations;
});
console.log('Nodes count (after dropping loners):', data.nodes.length);
}
// prepare data for force layout: map user IDs to indices
var userIds_indices = {};
data.nodes.forEach(function (user, i) {
userIds_indices[user.group] = i;
});
console.log('UserID to index map:', userIds_indices);
// change userID of relation edges to indices
data.edges.map(function (link) {
link.source = userIds_indices[link.source];
link.target = userIds_indices[link.target];
// for faster lookup, store neighboring nodes per node
data.nodes[link.source].relatedTo.push(link.target);
data.nodes[link.target].relatedFrom.push(link.source);
});
}
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