Class: Raif::PromptDiff

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

Overview

Line-level diff of two prompts, with word-level highlighting inside changed line pairs. Returns plain data so views can render (and escape) the text themselves.

Defined Under Namespace

Classes: Line, Segment

Constant Summary collapse

WORD_DIFF_TOKEN_LIMIT =

Lines with more tokens than this skip the word diff and are highlighted as a whole.

2_000
WORD_DIFF_MIN_SIMILARITY =

Line pairs that share less than this fraction of their words are highlighted as a whole.

0.5

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(original, current) ⇒ PromptDiff

Returns a new instance of PromptDiff.



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# File 'lib/raif/prompt_diff.rb', line 20

def initialize(original, current)
  @original_lines = original.to_s.strip.lines(chomp: true)
  @current_lines = current.to_s.strip.lines(chomp: true)
end

Class Method Details

.build(original, current) ⇒ Object 



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# File 'lib/raif/prompt_diff.rb', line 16

def self.build(original, current)
  new(original, current).lines
end

Instance Method Details

#lines ⇒ Object 



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# File 'lib/raif/prompt_diff.rb', line 25

def lines
  result = []
  deleted = []
  added = []

  Diff::LCS.sdiff(@original_lines, @current_lines).each do |change|
    case change.action
    when "="
      result.concat(deleted).concat(added)
      deleted = []
      added = []
      result << Line.new(:unchanged, [Segment.new(change.old_element, false)])
    when "-"
      deleted << Line.new(:deleted, [Segment.new(change.old_element, true)])
    when "+"
      added << Line.new(:added, [Segment.new(change.new_element, true)])
    when "!"
      old_segments, new_segments = word_diff(change.old_element, change.new_element)
      deleted << Line.new(:deleted, old_segments)
      added << Line.new(:added, new_segments)
    end
  end

  result.concat(deleted).concat(added)
end