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# frozen_string_literal: true
# == Schema Information
#
# Table name: glitch_keyword_mutes
#
# id :integer not null, primary key
# account_id :integer not null
# keyword :string not null
# whole_word :boolean default(TRUE), not null
# created_at :datetime not null
# updated_at :datetime not null
#
class Glitch::KeywordMute < ApplicationRecord
belongs_to :account, required: true
validates_presence_of :keyword
after_commit :invalidate_cached_matcher
def self.matcher_for(account_id)
Matcher.new(account_id)
end
private
def invalidate_cached_matcher
Rails.cache.delete("keyword_mutes:regex:#{account_id}")
end
class Matcher
attr_reader :account_id
attr_reader :regex
def initialize(account_id)
@account_id = account_id
regex_text = Rails.cache.fetch("keyword_mutes:regex:#{account_id}") { regex_text_for_account }
@regex = /#{regex_text}/i
end
def =~(str)
regex =~ str
end
private
def keywords
Glitch::KeywordMute.where(account_id: account_id).select(:keyword, :id, :whole_word)
end
def regex_text_for_account
kws = keywords.find_each.with_object([]) do |kw, a|
a << (kw.whole_word ? boundary_regex_for_keyword(kw.keyword) : kw.keyword)
end
Regexp.union(kws).source
end
def boundary_regex_for_keyword(keyword)
sb = keyword =~ /\A[[:word:]]/ ? '\b' : ''
eb = keyword =~ /[[:word:]]\Z/ ? '\b' : ''
/#{sb}#{Regexp.escape(keyword)}#{eb}/
end
end
end
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