Class: Kward::SessionDiff

Inherits:
Object
  • Object
show all
Defined in:
lib/kward/session_diff.rb

Overview

Counts unified-diff additions and deletions for summaries.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(additions: 0, deletions: 0) ⇒ SessionDiff

Returns a new instance of SessionDiff.



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# File 'lib/kward/session_diff.rb', line 9

def initialize(additions: 0, deletions: 0)
  @additions = additions.to_i
  @deletions = deletions.to_i
end

Instance Attribute Details

#additions ⇒ Object (readonly)

Returns the value of attribute additions.



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# File 'lib/kward/session_diff.rb', line 7

def additions
  @additions
end

#deletions ⇒ Object (readonly)

Returns the value of attribute deletions.



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# File 'lib/kward/session_diff.rb', line 7

def deletions
  @deletions
end

Class Method Details

.common_line_count(left, right) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 100

def self.common_line_count(left, right)
  previous = Array.new(right.length + 1, 0)
  left.each do |left_line|
    current = Array.new(right.length + 1, 0)
    right.each_with_index do |right_line, index|
      current[index + 1] = if left_line == right_line
                             previous[index] + 1
                           else
                             [current[index], previous[index + 1]].max
                           end
    end
    previous = current
  end
  previous.last
end

.count(diff) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 35

def self.count(diff)
  if (stats = truncated_diff_stats(diff))
    return stats
  elsif truncated_diff?(diff)
    return { additions: 0, deletions: 0 }
  end

  additions = 0
  deletions = 0
  removed = []
  added = []
  flush = lambda do
    common = common_line_count(removed, added)
    additions += added.length - common
    deletions += removed.length - common
    removed.clear
    added.clear
  end

  diff.to_s.each_line do |line|
    if line.start_with?("+") && !line.start_with?("+++")
      added << line[1..]
    elsif line.start_with?("-") && !line.start_with?("---")
      removed << line[1..]
    else
      flush.call
    end
  end
  flush.call
  { additions: additions, deletions: deletions }
end

.from_records(records) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 21

def self.from_records(records)
  execution_records = records.select { |record| record["type"] == "tool_execution_end" }
  source_records = execution_records.empty? ? records : execution_records
  source_records.each_with_object(new) do |record, diff|
    if record["type"] == "tool_execution_end"
      next if record["isError"] || record.dig("result", "isError")

      diff.add_diff(record.dig("result", "diff"))
    elsif record["type"] == "message" && (record.dig("message", "role") == "tool" || record.dig("message", :role) == "tool")
      diff.add_tool_result(record.dig("message", "content") || record.dig("message", :content))
    end
  end
end

.from_session_file(path) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 14

def self.from_session_file(path)
  records = File.readlines(path, chomp: true).filter_map { |line| parse_record(line) }
  from_records(records)
rescue Errno::ENOENT, Errno::EACCES
  new
end

.parse_record(line) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 116

def self.parse_record(line)
  JSON.parse(line)
rescue JSON::ParserError
  nil
end

.truncated_diff?(diff) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kward/session_diff.rb', line 96

def self.truncated_diff?(diff)
  diff.to_s.match?(/^\.\.\. diff truncated to \d+ bytes;/)
end

.truncated_diff_stats(diff) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 89

def self.truncated_diff_stats(diff)
  match = diff.to_s.match(/^\.\.\. diff truncated to \d+ bytes; full diff stats: \+(\d+)\|-(\d+)\./)
  return nil unless match

  { additions: match[1].to_i, deletions: match[2].to_i }
end

Instance Method Details

#add_diff(diff) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 78

def add_diff(diff)
  counts = self.class.count(diff)
  return false if counts[:additions].zero? && counts[:deletions].zero?

  @additions += counts[:additions]
  @deletions += counts[:deletions]
  true
end

#add_tool_result(content) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 71

def add_tool_result(content)
  text = content.to_s
  return false if text.start_with?("Error:", "Declined:")

  add_diff(extract_unified_diff(text))
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kward/session_diff.rb', line 67

def empty?
  @additions.zero? && @deletions.zero?
end