656d54e945
When given two regexps, Regexp.union preserves the options set (or not set) on each regex; this meant that none of the multiline (m), case-insensitivity (i), or extended syntax (x) options were set. Our regexps are written expecting the m, i, and x options were set on all of them, so we need to make sure that we preserve that behavior.
67 lines
1.6 KiB
Ruby
67 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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# == Schema Information
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#
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# Table name: glitch_keyword_mutes
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#
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# id :integer not null, primary key
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# account_id :integer not null
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# keyword :string not null
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# whole_word :boolean default(TRUE), not null
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# created_at :datetime not null
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# updated_at :datetime not null
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#
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class Glitch::KeywordMute < ApplicationRecord
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belongs_to :account, required: true
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validates_presence_of :keyword
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after_commit :invalidate_cached_matcher
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def self.matcher_for(account_id)
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Matcher.new(account_id)
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end
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private
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def invalidate_cached_matcher
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Rails.cache.delete("keyword_mutes:regex:#{account_id}")
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end
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class Matcher
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attr_reader :account_id
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attr_reader :regex
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def initialize(account_id)
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@account_id = account_id
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regex_text = Rails.cache.fetch("keyword_mutes:regex:#{account_id}") { regex_text_for_account }
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@regex = /#{regex_text}/
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end
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def =~(str)
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regex =~ str
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end
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private
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def keywords
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Glitch::KeywordMute.where(account_id: account_id).select(:keyword, :id, :whole_word)
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end
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def regex_text_for_account
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kws = keywords.find_each.with_object([]) do |kw, a|
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a << (kw.whole_word ? boundary_regex_for_keyword(kw.keyword) : kw.keyword)
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end
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Regexp.union(kws).source
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end
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def boundary_regex_for_keyword(keyword)
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sb = keyword =~ /\A[[:word:]]/ ? '\b' : ''
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eb = keyword =~ /[[:word:]]\Z/ ? '\b' : ''
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/(?mix:#{sb}#{Regexp.escape(keyword)}#{eb})/
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end
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end
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end
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