keyword mute: Store keywords as a list

This has a couple of advantages over the regex approach:

- Keywords are individually addressable, which makes it easier to gather
  statistics (#363)
- Keywords can be individually applied to different feeds, e.g. skipping
  mentions (#454)

It *does* end up creating many more Regexp objects.  I'm not yet sure if
the difference is significant.
This commit is contained in:
David Yip 2018-06-03 18:12:55 -05:00
parent 5dd2a78034
commit 37d495eeeb
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@ -33,68 +33,74 @@ class Glitch::KeywordMute < ApplicationRecord
Rails.cache.delete(TagMatcher.cache_key(account_id))
end
class RegexpMatcher
attr_reader :account_id
attr_reader :regex
class CachedKeywordMute
attr_reader :keyword
attr_reader :whole_word
def initialize(account_id)
@account_id = account_id
regex_text = Rails.cache.fetch(self.class.cache_key(account_id)) { make_regex_text }
@regex = /#{regex_text}/
def initialize(keyword, whole_word)
@keyword = keyword
@whole_word = whole_word
end
protected
def keywords
Glitch::KeywordMute.where(account_id: account_id).pluck(:whole_word, :keyword)
end
def boundary_regex_for_keyword(keyword)
def boundary_regex_for_keyword
sb = keyword =~ /\A[[:word:]]/ ? '\b' : ''
eb = keyword =~ /[[:word:]]\Z/ ? '\b' : ''
/(?mix:#{sb}#{Regexp.escape(keyword)}#{eb})/
end
def matches?(str)
str =~ (whole_word ? boundary_regex_for_keyword : /#{keyword}/i)
end
end
class TextMatcher < RegexpMatcher
class Matcher
attr_reader :account_id
attr_reader :words
def initialize(account_id)
@account_id = account_id
@words = Rails.cache.fetch(self.class.cache_key(account_id)) { fetch_keywords }
end
protected
def fetch_keywords
Glitch::KeywordMute.where(account_id: account_id).pluck(:whole_word, :keyword).map do |whole_word, keyword|
CachedKeywordMute.new(transform_keyword(keyword), whole_word)
end
end
def transform_keyword(keyword)
keyword
end
end
class TextMatcher < Matcher
def self.cache_key(account_id)
format('keyword_mutes:regex:text:%s', account_id)
end
def matches?(str)
!!(regex =~ str)
end
private
def make_regex_text
kws = keywords.map! do |whole_word, keyword|
whole_word ? boundary_regex_for_keyword(keyword) : /(?i:#{Regexp.escape(keyword)})/
end
Regexp.union(kws).source
words.any? { |w| w.matches?(str) }
end
end
class TagMatcher < RegexpMatcher
class TagMatcher < Matcher
def self.cache_key(account_id)
format('keyword_mutes:regex:tag:%s', account_id)
end
def matches?(tags)
tags.pluck(:name).any? { |n| regex =~ n }
tags.pluck(:name).any? do |n|
words.any? { |w| w.matches?(n) }
end
end
private
protected
def make_regex_text
kws = keywords.map! do |whole_word, keyword|
term = (Tag::HASHTAG_RE =~ keyword) ? $1 : keyword
whole_word ? boundary_regex_for_keyword(term) : term
end
Regexp.union(kws).source
def transform_keyword(kw)
Tag::HASHTAG_RE =~ kw ? $1 : kw
end
end
end