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hopefully better explanation

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gorhill 2014-06-28 11:40:26 -04:00
parent c49baf7926
commit bcaa139362
1 changed files with 14 additions and 5 deletions
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19
js/abp-filters.js
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@ -1391,11 +1391,20 @@ FilterContainer.prototype.matchString = function(pageDetails, url, requestType,
// or equivalent
// allow = whitelisted || !blacklisted
// Since statistically a hit on a block filter is more likely than a hit
// on an allow filter, we test block filters first, and then if and only
// if there is a hit on a block filter do we test against allow filters.
// This helps performance compared to testing against both classes of
// filters in the same loop.
// Statistically, hits on a URL in order of likelihood:
// 1. No hit
// 2. Hit on a block filter
// 3. Hit on an allow filter
//
// High likelihood of "no hit" means to optimize we need to reduce as much
// as possible the number of filters to test.
//
// Then, because of the order of probabilities, we should test only
// block filters first, and test allow filters if and only if there is a
// hit on a block filter. Since there is a high likelihood of no hit,
// testing allow filter by default is likely wasted work, hence allow
// filters are tested *only* if there is a hit on a (unlikely) hit on a
// block filter.
var pageDomain = pageDetails.pageDomain || '';
var party = requestHostname.slice(-pageDomain.length) === pageDomain ?