Class: TextAlignment::MixedAlignment

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str1, str2, mappings = []) ⇒ MixedAlignment

Returns a new instance of MixedAlignment.

Raises:

  • (ArgumentError) 


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# File 'lib/text_alignment/mixed_alignment.rb', line 22

def initialize(str1, str2, mappings = [])
	raise ArgumentError, "nil string" if str1.nil? || str2.nil?
	raise ArgumentError, "nil mappings" if mappings.nil?

	## preprocessing
	str1 = str1.dup
	str2 = str2.dup
	mappings = mappings.dup

	## find the first nomatch character
	TextAlignment::NOMATCH_CHARS.each_char do |c|
		if str2.index(c).nil?
			@nomatch_char1 = c
			break
		end
	end
	raise RuntimeError, "Cannot find nomatch character" if @nomatch_char1.nil?

	## find the first nomatch character
	TextAlignment::NOMATCH_CHARS.each_char do |c|
		if c != @nomatch_char1 && str1.index(c).nil?
			@nomatch_char2 = c
			break
		end
	end
	raise RuntimeError, "Cannot find nomatch character" if @nomatch_char2.nil?

	# single character mappings
	character_mappings = mappings.select{|m| m[0].length == 1 && m[1].length == 1}
	characters_from = character_mappings.collect{|m| m[0]}.join
	characters_to   = character_mappings.collect{|m| m[1]}.join
	characters_to.gsub!(/-/, '\-')

	str1.tr!(characters_from, characters_to)
	str2.tr!(characters_from, characters_to)

	mappings.delete_if{|m| m[0].length == 1 && m[1].length == 1}

	# ASCII foldings
	ascii_foldings = mappings.select{|m| m[0].length == 1 && m[1].length > 1}
	ascii_foldings.each do |f|
		from = f[1]

		if str2.index(f[0])
			to   = f[0] + (@nomatch_char1 * (f[1].length - 1))
			str1.gsub!(from, to)
		end

		if str1.index(f[0])
			to   = f[0] + (@nomatch_char2 * (f[1].length - 1))
			str2.gsub!(from, to)
		end
	end
	mappings.delete_if{|m| m[0].length == 1 && m[1].length > 1}

	_compute_mixed_alignment(str1, str2, mappings)
end

Instance Attribute Details

#common_elements ⇒ Object (readonly)

Returns the value of attribute common_elements.



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# File 'lib/text_alignment/mixed_alignment.rb', line 18

def common_elements
  @common_elements
end

#mapped_elements ⇒ Object (readonly)

Returns the value of attribute mapped_elements.



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# File 'lib/text_alignment/mixed_alignment.rb', line 18

def mapped_elements
  @mapped_elements
end

#position_map_begin ⇒ Object (readonly)

Returns the value of attribute position_map_begin.



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# File 'lib/text_alignment/mixed_alignment.rb', line 17

def position_map_begin
  @position_map_begin
end

#position_map_end ⇒ Object (readonly)

Returns the value of attribute position_map_end.



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# File 'lib/text_alignment/mixed_alignment.rb', line 17

def position_map_end
  @position_map_end
end

#sdiff ⇒ Object (readonly)

Returns the value of attribute sdiff.



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# File 'lib/text_alignment/mixed_alignment.rb', line 16

def sdiff
  @sdiff
end

#similarity ⇒ Object (readonly)

Returns the value of attribute similarity.



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# File 'lib/text_alignment/mixed_alignment.rb', line 19

def similarity
  @similarity
end

#str1_match_final ⇒ Object (readonly)

Returns the value of attribute str1_match_final.



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# File 'lib/text_alignment/mixed_alignment.rb', line 20

def str1_match_final
  @str1_match_final
end

#str1_match_initial ⇒ Object (readonly)

Returns the value of attribute str1_match_initial.



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# File 'lib/text_alignment/mixed_alignment.rb', line 20

def str1_match_initial
  @str1_match_initial
end

#str2_match_final ⇒ Object (readonly)

Returns the value of attribute str2_match_final.



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# File 'lib/text_alignment/mixed_alignment.rb', line 20

def str2_match_final
  @str2_match_final
end

#str2_match_initial ⇒ Object (readonly)

Returns the value of attribute str2_match_initial.



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# File 'lib/text_alignment/mixed_alignment.rb', line 20

def str2_match_initial
  @str2_match_initial
end

Instance Method Details

#transform_a_span(span) ⇒ Object 



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# File 'lib/text_alignment/mixed_alignment.rb', line 88

def transform_a_span(span)
	{begin: @position_map_begin[span[:begin]], end: @position_map_end[span[:end]]}
end

#transform_begin_position(begin_position) ⇒ Object 



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# File 'lib/text_alignment/mixed_alignment.rb', line 80

def transform_begin_position(begin_position)
	@position_map_begin[begin_position]
end

#transform_denotations!(denotations) ⇒ Object 



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# File 'lib/text_alignment/mixed_alignment.rb', line 96

def transform_denotations!(denotations)
	denotations.map!{|d| d.begin = @position_map_begin[d.begin]; d.end = @position_map_end[d.end]; d} unless denotations.nil?
end

#transform_end_position(end_position) ⇒ Object 



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# File 'lib/text_alignment/mixed_alignment.rb', line 84

def transform_end_position(end_position)
	@position_map_end[end_position]
end

#transform_hdenotations(hdenotations) ⇒ Object 



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# File 'lib/text_alignment/mixed_alignment.rb', line 100

def transform_hdenotations(hdenotations)
	return nil if hdenotations.nil?
	hdenotations.collect{|d| d.dup.merge({span:transform_a_span(d[:span])})}
end

#transform_spans(spans) ⇒ Object 



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# File 'lib/text_alignment/mixed_alignment.rb', line 92

def transform_spans(spans)
	spans.map{|span| transform_a_span(span)}
end