Class: Gemlings::Memory

Inherits:
Object
  • Object
show all
Defined in:
lib/gemlings/memory.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(system_prompt:, task:) ⇒ Memory

Returns a new instance of Memory.



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# File 'lib/gemlings/memory.rb', line 38

def initialize(system_prompt:, task:)
  @system_prompt = system_prompt
  @task = task
  @steps = []
  @total_tokens = TokenUsage.new(input_tokens: 0, output_tokens: 0)
  @total_duration = 0.0
end

Instance Attribute Details

#steps ⇒ Object (readonly)

Returns the value of attribute steps.



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# File 'lib/gemlings/memory.rb', line 36

def steps
  @steps
end

#system_prompt ⇒ Object (readonly)

Returns the value of attribute system_prompt.



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# File 'lib/gemlings/memory.rb', line 36

def system_prompt
  @system_prompt
end

#task ⇒ Object (readonly)

Returns the value of attribute task.



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# File 'lib/gemlings/memory.rb', line 36

def task
  @task
end

#total_duration ⇒ Object (readonly)

Returns the value of attribute total_duration.



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# File 'lib/gemlings/memory.rb', line 36

def total_duration
  @total_duration
end

#total_tokens ⇒ Object (readonly)

Returns the value of attribute total_tokens.



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# File 'lib/gemlings/memory.rb', line 36

def total_tokens
  @total_tokens
end

Instance Method Details

#action_steps ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 70

def action_steps
  @steps.select { |s| s.is_a?(ActionStep) }
end

#add_plan(plan:, duration: 0.0, token_usage: nil) ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 61

def add_plan(plan:, duration: 0.0, token_usage: nil)
  step = PlanningStep.new(plan: plan, duration: duration, token_usage: token_usage)
  record_step(step, duration, token_usage)
end

#add_step(thought:, code: nil, tool_calls: nil, observation: nil, error: nil, duration: 0.0, token_usage: nil) ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 46

def add_step(thought:, code: nil, tool_calls: nil, observation: nil, error: nil,
             duration: 0.0, token_usage: nil)
  step = ActionStep.new(
    step_number: action_steps.size + 1,
    thought: thought,
    code: code,
    tool_calls: tool_calls,
    observation: observation,
    error: error,
    duration: duration,
    token_usage: token_usage
  )
  record_step(step, duration, token_usage)
end

#add_user_message(message) ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 66

def add_user_message(message)
  @steps << UserMessage.new(content: message)
end

#last_step ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 135

def last_step
  @steps.last
end

#progress_summary ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 74

def progress_summary
  completed = action_steps
  return "No steps completed yet." if completed.empty?

  lines = ["Steps completed so far:"]
  completed.each do |step|
    status = step.error ? "failed" : "done"
    summary = step.thought || step.observation || "no details"
    lines << "  #{step.step_number}. [#{status}] #{summary.to_s[0, 100]}"
  end
  lines.join("\n")
end

#replay(io: $stdout) ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 158

def replay(io: $stdout)
  io.puts UI::Styles.final_answer.render("Task: ") + task.to_s
  io.puts

  steps.each do |step|
    case step
    when ActionStep
      replay_action_step(step, io)
    when PlanningStep
      io.puts UI::Styles.plan_label.render(" Plan ")
      io.puts UI::Styles.plan_box.render(step.plan)
      replay_metrics(step, io)
    when UserMessage
      io.puts UI::Styles.label.render("User: ") + step.content.to_s
      io.puts
    end
  end

  count = action_steps.size
  parts = ["#{count} #{count == 1 ? "step" : "steps"}", format("%.1fs total", total_duration)]
  parts << total_tokens.to_s if total_tokens.total_tokens > 0
  io.puts UI::Styles.dim.render(parts.join(" | "))
end

#return_full_code ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 139

def return_full_code
  action_steps.filter_map(&:code).join("\n\n")
end

#to_h ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 143

def to_h
  {
    system_prompt: system_prompt,
    task: task,
    steps: steps.map(&:to_h),
    total_tokens: total_tokens.to_h,
    total_duration: total_duration
  }
end

#to_json(*args) ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 153

def to_json(*args)
  require "json"
  to_h.to_json(*args)
end

#to_messages ⇒ Object 



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# File 'lib/gemlings/memory.rb', line 87

def to_messages
  messages = [
    { role: "system", content: system_prompt },
    { role: "user", content: task }
  ]

  steps.each do |step|
    case step
    when UserMessage
      messages << { role: "user", content: step.content }
    when PlanningStep
      messages << { role: "assistant", content: "Plan:\n#{step.plan}" }
      messages << { role: "user", content: "Now proceed and carry out this plan." }
    when ActionStep
      assistant_msg = build_assistant_message(step)
      messages << assistant_msg if assistant_msg

      if step.observation
        if step.tool_calls&.any?
          # Some LLM APIs (e.g. Anthropic) require that every tool_use block in an
          # assistant message is immediately followed by a tool_result block in the
          # next user message — a plain text "Observation:" message is rejected.
          # Build a structured tool_result entry for each tool call in this step.
          tool_results = step.tool_calls.map do |tc|
            { type: "tool_result", tool_use_id: tc.id, content: step.observation }
          end
          messages << { role: "user", content: tool_results }
        else
          messages << { role: "user", content: "Observation: #{step.observation}" }
        end
      elsif step.error
        messages << {
          role: "user",
          content: "Error: #{step.error}\nNow let's retry: take care not to repeat previous errors! " \
                   "If you have retried several times, try a completely different approach."
        }
      end
    end
  end

  # Some LLM APIs (e.g. Anthropic) reject messages whose string content ends with
  # trailing whitespace. Strip it from every message to avoid API errors.
  messages.each do |m|
    m[:content] = sanitize_utf8(m[:content]) if m[:content].is_a?(String)
    m[:content] = m[:content].rstrip if m[:content].is_a?(String)
  end
end