Class: PrettierPrint::Buffer::ArrayBuffer

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

Overview

This is an output buffer that wraps an array output object. It provides a trim! method that trims off trailing whitespace from the last element in the array if it’s an unfrozen string using the same method as the StringBuffer.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(output = []) ⇒ ArrayBuffer

Returns a new instance of ArrayBuffer.



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# File 'lib/prettier_print.rb', line 306

def initialize(output = [])
  @output = output
end

Instance Attribute Details

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/prettier_print.rb', line 304

def output
  @output
end

Instance Method Details

#<<(object) ⇒ Object 



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# File 'lib/prettier_print.rb', line 310

def <<(object)
  @output << object
end

#trim! ⇒ Object 



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# File 'lib/prettier_print.rb', line 314

def trim!
  return 0 if output.empty?

  trimmed = 0

  while output.any? && output.last.is_a?(String) &&
          output.last.match?(/\A[\t ]*\z/)
    trimmed += output.pop.length
  end

  if output.any? && output.last.is_a?(String) && !output.last.frozen?
    length = output.last.length
    output.last.gsub!(/[\t ]*\z/, "")
    trimmed += length - output.last.length
  end

  trimmed
end