Class: Slack::Messenger::Util::UntrustedRegexp

Inherits:
Object
  • Object
show all
Defined in:
lib/slack-messenger/util/untrusted_regexp.rb

Instance Method Summary collapse

Constructor Details

#initialize(pattern, multiline: false) ⇒ UntrustedRegexp

Returns a new instance of UntrustedRegexp.

Raises:

  • (RegexpError) 


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# File 'lib/slack-messenger/util/untrusted_regexp.rb', line 23

def initialize(pattern, multiline: false)
  if multiline
    pattern = "(?m)#{pattern}"
  end

  @regexp = RE2::Regexp.new(pattern, log_errors: false)
  @scan_regexp = initialize_scan_regexp

  raise RegexpError, regexp.error unless regexp.ok?
end

Instance Method Details

#match(text) ⇒ Object 



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# File 'lib/slack-messenger/util/untrusted_regexp.rb', line 55

def match(text)
  scan_regexp.match(text)
end

#replace_gsub(text) ⇒ Object

There is no built-in replace with block support (like ‘gsub`). We can accomplish the same thing by parsing and rebuilding the string with the substitutions.



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# File 'lib/slack-messenger/util/untrusted_regexp.rb', line 36

def replace_gsub(text)
  new_text = +''
  remainder = text

  matched = match(remainder)

  until matched.nil? || matched.to_a.compact.empty?
    partitioned = remainder.partition(matched.to_s)
    new_text << partitioned.first
    remainder = partitioned.last

    new_text << yield(matched)

    matched = match(remainder)
  end

  new_text << remainder
end