Class: PatienceDiff::Formatter

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

Overview

Formats a plaintext unified diff.

Direct Known Subclasses

Html::Formatter

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(differ, title = nil) ⇒ Formatter

Returns a new instance of Formatter.



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# File 'lib/patience_diff/formatter.rb', line 9

def initialize(differ, title = nil)
  @differ = differ
  @names = []
  @title = title || "Diff generated on #{Time.now.strftime('%c')}"
end

Instance Attribute Details

#left_name ⇒ Object

Returns the value of attribute left_name.



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# File 'lib/patience_diff/formatter.rb', line 7

def left_name
  @left_name
end

#left_timestamp ⇒ Object

Returns the value of attribute left_timestamp.



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# File 'lib/patience_diff/formatter.rb', line 7

def left_timestamp
  @left_timestamp
end

#names ⇒ Object (readonly)

Returns the value of attribute names.



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# File 'lib/patience_diff/formatter.rb', line 6

def names
  @names
end

#right_name ⇒ Object

Returns the value of attribute right_name.



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# File 'lib/patience_diff/formatter.rb', line 7

def right_name
  @right_name
end

#right_timestamp ⇒ Object

Returns the value of attribute right_timestamp.



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# File 'lib/patience_diff/formatter.rb', line 7

def right_timestamp
  @right_timestamp
end

#title ⇒ Object

Returns the value of attribute title.



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# File 'lib/patience_diff/formatter.rb', line 7

def title
  @title
end

Instance Method Details

#format {|context| ... } ⇒ Object

Yields:

  • (context) 


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# File 'lib/patience_diff/formatter.rb', line 15

def format
  context = FormattingContext.new(@differ, self)
  yield context
  context.format
end

#render_header(left_name = nil, right_name = nil, left_timestamp = nil, right_timestamp = nil) ⇒ Object 



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# File 'lib/patience_diff/formatter.rb', line 21

def render_header(left_name=nil, right_name=nil, left_timestamp=nil, right_timestamp=nil)
  @names << right_name
  @left_name = left_name || "Original"
  @right_name = right_name || "Current"
  @left_timestamp = left_timestamp || Time.now
  @right_timestamp = right_timestamp || Time.now
  [
    left_header_line(@left_name, @left_timestamp),
    right_header_line(@right_name, @right_timestamp)
  ]
end

#render_hunk(a, b, opcodes, last_line_shown) ⇒ Object 



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# File 'lib/patience_diff/formatter.rb', line 42

def render_hunk(a, b, opcodes, last_line_shown)
  lines = [render_hunk_marker(opcodes)]
  lines << opcodes.collect do |(code, a_start, a_end, b_start, b_end)|
    case code
    when :equal 
      b[b_start..b_end].map { |line| ' ' + line }
    when :delete
      a[a_start..a_end].map { |line| '-' + line }
    when :insert
      b[b_start..b_end].map { |line| '+' + line }
    end
  end
  lines
end

#render_hunk_marker(opcodes) ⇒ Object 



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# File 'lib/patience_diff/formatter.rb', line 33

def render_hunk_marker(opcodes)
  a_start = opcodes.first[1] + 1
  a_end = opcodes.last[2] + 2
  b_start = opcodes.first[3] + 1
  b_end = opcodes.last[4] + 2
  
  "@@ -%d,%d +%d,%d @@" % [a_start, a_end-a_start, b_start, b_end-b_start]
end