Class: Specdiff::Differ::Text

Inherits:
Object
  • Object
show all
Extended by:
Colorize
Defined in:
lib/specdiff/differ/text.rb

Constant Summary collapse

NEWLINE = 
"\n".freeze
CONTEXT_LINES = 
3

Class Method Summary collapse

Methods included from Colorize

blue, colorize_by_line, cyan, green, red, reset_color, yellow

Class Method Details

.diff(a, b) ⇒ Object

this implementation is based on RSpec::Support::Differ github.com/rspec/rspec-support/blob/main/lib/rspec/support/differ.rb and also the hunk generator it uses



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# File 'lib/specdiff/differ/text.rb', line 13

def self.diff(a, b)
  a_value = a.value
  b_value = b.value

  if a_value.encoding != b_value.encoding
    return colorize_by_line("      Strings have different encodings:\n        \#{a.value.encoding.inspect} != \#{b.value.encoding.inspect}\n    MSG\n      # makes it stand out a bit more from the red of rspec output\n      reset_color(line)\n    end\n  end\n\n  diff = \"\"\n\n  # if there are no newlines then the text differ doesn't produce any valuable\n  # output. \"word diffing\" would improve this case.\n  if a_value.count(NEWLINE) <= 1 && b_value.count(NEWLINE) <= 1\n    return diff\n  end\n\n  a_lines = a_value.split(NEWLINE).map! { _1.chomp }\n  b_lines = b_value.split(NEWLINE).map! { _1.chomp }\n\n  file_length_difference = 0\n\n  hunks = ::Diff::LCS.diff(a_lines, b_lines).map do |piece|\n    ::Diff::LCS::Hunk.new(\n      a_lines, b_lines, piece, CONTEXT_LINES, file_length_difference,\n    ).tap { |hunk| file_length_difference = hunk.file_length_difference }\n  end\n\n  hunks.each_cons(2) do |prev_hunk, current_hunk|\n    begin\n      if current_hunk.overlaps?(prev_hunk)\n        current_hunk.merge(prev_hunk)\n      else\n        diff << prev_hunk.diff(:unified)\n      end\n    ensure\n      diff << NEWLINE\n    end\n  end\n\n  if hunks.last\n    diff << NEWLINE\n    diff << hunks.last.diff(:unified)\n  end\n\n  return diff if diff == \"\"\n\n  diff << NEWLINE\n  diff.lstrip!\n\n  return colorize_by_line(diff) do |line|\n    case line[0].chr\n    when \"+\"\n      green(line)\n    when \"-\"\n      red(line)\n    when \"@\"\n      if line[1].chr == \"@\"\n        cyan(line)\n      else\n        reset_color(line)\n      end\n    else\n      reset_color(line)\n    end\n  end\nend\n") do |line|

.empty?(diff) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/specdiff/differ/text.rb', line 86

def self.empty?(diff)
  diff.raw == ""
end

.stringify(diff) ⇒ Object 



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# File 'lib/specdiff/differ/text.rb', line 90

def self.stringify(diff)
  diff.raw
end