Class: Packr::RegexpGroup::Item

Inherits:
Object
  • Object
show all
Defined in:
lib/packr/regexp_group.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expression, replacement) ⇒ Item

Returns a new instance of Item.



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# File 'lib/packr/regexp_group.rb', line 82

def initialize(expression, replacement)
  @expression = expression.is_a?(Regexp) ? expression.source : expression.to_s
  
  if replacement.is_a?(Numeric)
    replacement = "\\" + replacement.to_s
  elsif replacement.nil?
    replacement = ""
  end
  
  # does the pattern use sub-expressions?
  if replacement.is_a?(String) and replacement =~ /\\(\d+)/
    # a simple lookup? (e.g. "\2")
    if replacement.gsub(/\n/, " ") =~ /^\\\d+$/
      # store the index (used for fast retrieval of matched strings)
      replacement = replacement[1..-1].to_i
    else # a complicated lookup (e.g. "Hello \2 \1")
      # build a function to do the lookup
      q = (replacement.gsub(/\\./, "") =~ /'/) ? '"' : "'"
      replacement = replacement.gsub(/\r/, "\\r").gsub(/\\(\d+)/,
          q + "+(args[\\1]||" + q+q + ")+" + q)
      replacement_string = q + replacement.gsub(/(['"])\1\+(.*)\+\1\1$/, '\1') + q
      replacement = lambda { |*args| eval(replacement_string) }
    end
  end
  
  @length = RegexpGroup.count(@expression)
  @replacement = replacement
end

Instance Attribute Details

#expression ⇒ Object

Returns the value of attribute expression.



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# File 'lib/packr/regexp_group.rb', line 80

def expression
  @expression
end

#length ⇒ Object

Returns the value of attribute length.



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# File 'lib/packr/regexp_group.rb', line 80

def length
  @length
end

#replacement ⇒ Object

Returns the value of attribute replacement.



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# File 'lib/packr/regexp_group.rb', line 80

def replacement
  @replacement
end

Instance Method Details

#to_s ⇒ Object 



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# File 'lib/packr/regexp_group.rb', line 111

def to_s
  @expression
end