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Kward

Class: Kward::SessionDiff

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

Overview

Counts unified-diff additions and deletions for summaries.

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 7

def initialize(additions: 0, deletions: 0)
  @base_additions = additions.to_i
  @base_deletions = deletions.to_i
  @file_changes = Hash.new { |changes, path| changes[path] = { removed: [], added: [] } }
end

Class Method Details

.changed_lines_by_file(diff) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 131

def self.changed_lines_by_file(diff)
  current_path = nil
  changes = Hash.new { |file_changes, path| file_changes[path] = { removed: [], added: [] } }
  removed = []
  added = []
  flush = lambda do
    unmatched = unmatched_lines(removed, added)
    changes[current_path][:removed].concat(unmatched[:removed]) if current_path
    changes[current_path][:added].concat(unmatched[:added]) if current_path
    removed.clear
    added.clear
  end

  diff.to_s.each_line do |line|
    if line.start_with?("--- ")
      flush.call
      current_path = line[4..].to_s.chomp
    elsif 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
  changes.reject { |_path, lines| lines[:removed].empty? && lines[:added].empty? }
end

.common_line_count(left, right) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 115

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

.common_line_indexes(left, right) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 170

def self.common_line_indexes(left, right)
  lengths = Array.new(left.length + 1) { Array.new(right.length + 1, 0) }
  left.each_with_index do |left_line, left_index|
    right.each_with_index do |right_line, right_index|
      lengths[left_index + 1][right_index + 1] = if left_line == right_line
                                                    lengths[left_index][right_index] + 1
                                                  else
                                                    [lengths[left_index + 1][right_index], lengths[left_index][right_index + 1]].max
                                                  end
    end
  end

  indexes = []
  left_index = left.length
  right_index = right.length
  while left_index.positive? && right_index.positive?
    if left[left_index - 1] == right[right_index - 1]
      indexes.unshift([left_index - 1, right_index - 1])
      left_index -= 1
      right_index -= 1
    elsif lengths[left_index - 1][right_index] >= lengths[left_index][right_index - 1]
      left_index -= 1
    else
      right_index -= 1
    end
  end
  indexes
end

.count(diff) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 42

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 28

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 21

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 199

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 111

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 104

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

.unmatched_lines(left, right) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 160

def self.unmatched_lines(left, right)
  matches = common_line_indexes(left, right)
  left_matches = matches.map(&:first)
  right_matches = matches.map(&:last)
  {
    removed: left.each_index.reject { |index| left_matches.include?(index) }.map { |index| left[index] },
    added: right.each_index.reject { |index| right_matches.include?(index) }.map { |index| right[index] }
  }
end

Instance Method Details

#add_diff(diff) ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 85

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

    @base_additions += counts[:additions]
    @base_deletions += counts[:deletions]
    return true
  end

  changes = self.class.changed_lines_by_file(diff)
  return false if changes.empty?

  changes.each { |path, lines| apply_file_change(path, lines) }
  true
end

#add_tool_result(content) ⇒ Object 



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

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

  add_diff(extract_unified_diff(text))
end

#additions ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 13

def additions
  @base_additions + @file_changes.values.sum { |changes| changes[:added].length }
end

#deletions ⇒ Object 



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# File 'lib/kward/session_diff.rb', line 17

def deletions
  @base_deletions + @file_changes.values.sum { |changes| changes[:removed].length }
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kward/session_diff.rb', line 74

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