discourse/lib/text_cleaner.rb

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# frozen_string_literal: true
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#
# Clean up a text
#
# We use ActiveSupport mb_chars from here to properly support non ascii downcase
require 'active_support/core_ext/string/multibyte'
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class TextCleaner
def self.title_options
# cf. http://meta.discourse.org/t/should-we-have-auto-replace-rules-in-titles/5687
{
deduplicate_exclamation_marks: SiteSetting.title_prettify,
deduplicate_question_marks: SiteSetting.title_prettify,
replace_all_upper_case: SiteSetting.title_prettify && !SiteSetting.allow_uppercase_posts,
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capitalize_first_letter: SiteSetting.title_prettify,
remove_all_periods_from_the_end: SiteSetting.title_prettify,
remove_extraneous_space: SiteSetting.title_prettify && SiteSetting.title_remove_extraneous_space,
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fixes_interior_spaces: true,
strip_whitespaces: true,
strip_zero_width_spaces: true,
case_option: SiteSetting.default_locale == "tr_TR" ? :turkic : nil
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}
end
def self.clean_title(title)
TextCleaner.clean(title, TextCleaner.title_options)
end
def self.clean(text, opts = {})
text = text.dup
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# Remove invalid byte sequences
text.scrub!("")
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# Replace !!!!! with a single !
text.gsub!(/!+/, '!') if opts[:deduplicate_exclamation_marks]
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# Replace ????? with a single ?
text.gsub!(/\?+/, '?') if opts[:deduplicate_question_marks]
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# Replace all-caps text with regular case letters
text = downcase(text.mb_chars, opts).to_s if opts[:replace_all_upper_case] && (text == upcase(text.mb_chars, opts))
# Capitalize first letter, but only when entire first word is lowercase
first, rest = text.split(' ', 2)
if first && opts[:capitalize_first_letter] && first == downcase(first.mb_chars, opts)
text = +"#{capitalize(first.mb_chars, opts)}#{rest ? ' ' + rest : ''}"
end
# Remove unnecessary periods at the end
text.sub!(/([^.])\.+(\s*)\z/, '\1\2') if opts[:remove_all_periods_from_the_end]
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# Remove extraneous space before the end punctuation
text.sub!(/\s+([!?]\s*)\z/, '\1') if opts[:remove_extraneous_space]
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# Fixes interior spaces
text.gsub!(/ +/, ' ') if opts[:fixes_interior_spaces]
# Normalize whitespaces
text = normalize_whitespaces(text)
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# Strip whitespaces
text.strip! if opts[:strip_whitespaces]
# Strip zero width spaces
text.gsub!(/\u200b/, '') if opts[:strip_zero_width_spaces]
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text
end
@@whitespaces_regexp = Regexp.new("(\u00A0|\u1680|\u180E|[\u2000-\u200A]|\u2028|\u2029|\u202F|\u205F|\u3000)", Regexp::IGNORECASE).freeze
def self.normalize_whitespaces(text)
text&.gsub(@@whitespaces_regexp, ' ')
end
def self.downcase(text, opts)
opts[:case_option] ? text.downcase(opts[:case_option]) : text.downcase
end
def self.upcase(text, opts)
opts[:case_option] ? text.upcase(opts[:case_option]) : text.upcase
end
def self.capitalize(text, opts)
opts[:case_option] ? text.capitalize(opts[:case_option]) : text.capitalize
end
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end