Class: Diff::LCS::Block

Inherits:
Object
  • Object
show all
Defined in:
lib/diff/lcs/block.rb

Overview

A block is an operation removing, adding, or changing a group of items. Basically, this is just a list of changes, where each change adds or deletes a single item. Used by bin/ldiff.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(chunk) ⇒ Block

Returns a new instance of Block.



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# File 'lib/diff/lcs/block.rb', line 9

def initialize(chunk)
  @changes = []
  @insert = []
  @remove = []

  chunk.each do |item|
    @changes << item
    @remove << item if item.deleting?
    @insert << item if item.adding?
  end
end

Instance Attribute Details

#changes ⇒ Object (readonly)

Returns the value of attribute changes.



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# File 'lib/diff/lcs/block.rb', line 7

def changes
  @changes
end

#insert ⇒ Object (readonly)

Returns the value of attribute insert.



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# File 'lib/diff/lcs/block.rb', line 7

def insert
  @insert
end

#remove ⇒ Object (readonly)

Returns the value of attribute remove.



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# File 'lib/diff/lcs/block.rb', line 7

def remove
  @remove
end

Instance Method Details

#diff_size ⇒ Object 



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# File 'lib/diff/lcs/block.rb', line 21

def diff_size
  @insert.size - @remove.size
end

#op ⇒ Object 



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# File 'lib/diff/lcs/block.rb', line 25

def op
  case [@remove.empty?, @insert.empty?]
  when [false, false]
    "!"
  when [false, true]
    "-"
  when [true, false]
    "+"
  else # [true, true]
    "^"
  end
end