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Module: Kward::ModelStreamParser

Defined in:
lib/kward/model/stream_parser.rb

Overview

Parses streaming provider responses into Kward assistant messages.

ModelStreamParser is intentionally provider-shape focused and side-effect light: it accumulates assistant text, reasoning summaries, tool calls, and normalized usage from SSE events. Network IO, retries, credentials, and telemetry stay in Client; frontend rendering stays in CLI/RPC event handlers. Keep parser methods deterministic and easy to unit test with raw response bodies.

Class Method Summary collapse

Class Method Details

.active_codex_item(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 697

def active_codex_item(state)
  key = state[:active_item_id]
  key ? state[:items_by_id][key] : nil
end

.active_or_known_codex_item(state, item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 682

def active_or_known_codex_item(state, item)
  key = codex_item_key(item)
  known = state[:items_by_id][key]
  return known if known

  active = active_codex_item(state)
  return active if active && (!codex_item_has_stable_key?(item) || codex_item_key(active) == key)

  nil
end

.anthropic_sse_error(data, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 256

def anthropic_sse_error(data, request_error_class: nil)
  if request_error_class
    request_error_class.new(provider: "Anthropic", code: 400, body: data)
  else
    data
  end
end

.anthropic_sse_message(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 278

def anthropic_sse_message(state)
  message = { "role" => "assistant", "content" => state[:content] }
  message["reasoning_summary"] = state[:reasoning_summary] unless state[:reasoning_summary].empty?
  message["tool_calls"] = state[:tool_calls] unless state[:tool_calls].empty?
  message["usage"] = state[:usage] if state[:usage]
  message
end

.anthropic_sse_state ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 203

def anthropic_sse_state
  { content: +"", reasoning_summary: +"", blocks: {}, tool_calls: [], usage: nil }
end

.anthropic_tool_call(block_data) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 264

def anthropic_tool_call(block_data)
  return nil unless block_data.is_a?(Hash) && block_data["type"] == "tool_use"

  name = from_claude_code_tool_name(block_data["name"])
  arguments = block_data["partial_json"].to_s
  arguments = JSON.dump(block_data["input"] || {}) if arguments.empty?
  arguments = "{}" if arguments.empty?
  {
    "id" => block_data["id"] || "call_#{name}",
    "type" => "function",
    "function" => { "name" => name, "arguments" => arguments }
  }
end

.append_codex_raw_reasoning_text(state, text, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 524

def append_codex_raw_reasoning_text(state, text, on_reasoning_delta: nil)
  text = compact_codex_reasoning_delta_spacing(state[:reasoning_summary], text)
  return if text.empty?

  state[:raw_reasoning_visible] << text
  state[:reasoning_summary] << text
  on_reasoning_delta&.call(text)
end

.append_codex_reasoning_text(state, text, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 510

def append_codex_reasoning_text(state, text, on_reasoning_delta: nil)
  text = compact_codex_reasoning_delta_spacing(state[:reasoning_summary], text)
  return if text.empty?

  item = active_codex_item(state)
  if item&.fetch("type", nil) == "reasoning"
    item["summary"] ||= []
    item["summary"] << { "type" => "summary_text", "text" => +"" } if item["summary"].empty?
    item["summary"].last["text"] = item["summary"].last["text"].to_s + text
  end
  state[:reasoning_summary] << text
  on_reasoning_delta&.call(text)
end

.codex_commentary_message_item?(item) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kward/model/stream_parser.rb', line 789

def codex_commentary_message_item?(item)
  codex_message_phase(item) == "commentary"
end

.codex_content_part_added(state, part) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 410

def codex_content_part_added(state, part)
  item = active_codex_item(state)
  return unless item&.fetch("type", nil) == "message" && part.is_a?(Hash)
  return unless ["output_text", "text", "refusal"].include?(part["type"])

  item["content"] ||= []
  item["content"] << deep_dup_hash(part)
  state[:current_text_content_part] = item["content"].last
end

.codex_item_has_stable_key?(item) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kward/model/stream_parser.rb', line 693

def codex_item_has_stable_key?(item)
  item.key?("id") || item.key?("call_id")
end

.codex_item_key(item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 713

def codex_item_key(item)
  item["id"] || item["call_id"] || "item_#{item.object_id}"
end

.codex_message_phase(item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 793

def codex_message_phase(item)
  item["phase"].to_s
end

.codex_output_item_added(state, item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 398

def codex_output_item_added(state, item)
  return unless item.is_a?(Hash)

  item = deep_dup_hash(item)
  item["content"] = [] if item["type"] == "message" && !item["content"].is_a?(Array)
  item["summary"] = [] if item["type"] == "reasoning" && !item["summary"].is_a?(Array)
  remember_codex_item(state, item)
  state[:active_item_id] = codex_item_key(item)
  state[:current_text_content_part] = nil
  state[:current_reasoning_content_part] = nil
end

.codex_output_item_done(state, item, on_assistant_delta: nil, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 609

def codex_output_item_done(state, item, on_assistant_delta: nil, on_reasoning_delta: nil)
  return unless item.is_a?(Hash)

  item = merge_codex_item(active_or_known_codex_item(state, item), item)
  item = codex_visible_reasoning_item(state, item)
  remember_codex_item(state, item)
  collect_codex_item_output(state, item, on_assistant_delta: on_assistant_delta, on_reasoning_delta: on_reasoning_delta)
  state[:active_item_id] = nil if state[:active_item_id] == codex_item_key(item)
  state[:current_text_content_part] = nil
  state[:current_reasoning_content_part] = nil
end

.codex_output_text_delta(state, delta, on_reasoning_delta: nil, on_assistant_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 420

def codex_output_text_delta(state, delta, on_reasoning_delta: nil, on_assistant_delta: nil)
  text = delta.to_s
  return if text.empty?

  item = active_codex_item(state)
  if item&.fetch("type", nil) == "message"
    item["content"] ||= [{ "type" => "output_text", "text" => +"" }]
    part = state[:current_text_content_part] || item["content"].last
    part = item["content"].last unless part.is_a?(Hash)
    part["type"] ||= "output_text"
    text_key = part["type"] == "refusal" ? "refusal" : "text"
    part[text_key] = part[text_key].to_s + text
    if codex_streamable_message_item?(item)
      on_assistant_delta&.call(text)
      state[:emitted_message_keys] << codex_item_key(item)
    elsif codex_commentary_message_item?(item)
      on_reasoning_delta&.call(text)
      state[:emitted_message_keys] << codex_item_key(item)
    end
  end
  state[:raw_content] << text
end

.codex_raw_reasoning_delta(state, delta, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 459

def codex_raw_reasoning_delta(state, delta, on_reasoning_delta: nil)
  text = delta.to_s
  return if text.empty?

  item = active_codex_item(state)
  if item&.fetch("type", nil) == "reasoning" && state[:show_raw_reasoning]
    item["content"] ||= [{ "type" => "reasoning_text", "text" => +"" }]
    part = state[:current_reasoning_content_part] || item["content"].last
    part = item["content"].last unless part.is_a?(Hash)
    part["type"] ||= "reasoning_text"
    part["text"] = part["text"].to_s + text
    state[:current_reasoning_content_part] = part
  end
  return unless state[:show_raw_reasoning]

  visible = visible_codex_reasoning_delta(state, text)
  append_codex_raw_reasoning_text(state, visible, on_reasoning_delta: on_reasoning_delta) unless visible.empty?
end

.codex_raw_reasoning_done(state, text, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 478

def codex_raw_reasoning_done(state, text, on_reasoning_delta: nil)
  item = active_codex_item(state)
  full_text = text.to_s
  if item&.fetch("type", nil) == "reasoning" && state[:show_raw_reasoning]
    item["content"] ||= [{ "type" => "reasoning_text", "text" => +"" }]
    part = state[:current_reasoning_content_part] || item["content"].last
    part = item["content"].last unless part.is_a?(Hash)
    part["type"] ||= "reasoning_text"
    part["text"] = full_text
    state[:current_reasoning_content_part] = part
  end
  return unless state[:show_raw_reasoning]

  flush_codex_reasoning_delta(state, on_reasoning_delta: on_reasoning_delta)
  visible = sanitize_codex_reasoning_text(full_text)
  emitted = state[:raw_reasoning_visible]
  text = visible.start_with?(emitted) ? visible[emitted.length..].to_s : (emitted.empty? ? visible : +"")
  append_codex_raw_reasoning_text(state, text, on_reasoning_delta: on_reasoning_delta) unless text.empty?
end

.codex_reasoning_delta(state, delta, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 452

def codex_reasoning_delta(state, delta, on_reasoning_delta: nil)
  text = visible_codex_reasoning_delta(state, delta)
  return if text.empty?

  append_codex_reasoning_text(state, text, on_reasoning_delta: on_reasoning_delta)
end

.codex_reasoning_part_done(state, on_reasoning_delta: nil, on_reasoning_boundary: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 498

def codex_reasoning_part_done(state, on_reasoning_delta: nil, on_reasoning_boundary: nil)
  item = active_codex_item(state)
  return unless item&.fetch("type", nil) == "reasoning"
  return if item["summary"].to_a.empty?

  flush_codex_reasoning_delta(state, on_reasoning_delta: on_reasoning_delta)
  item["summary"].last["text"] = "#{item["summary"].last["text"].to_s.rstrip}\n\n"
  state[:reasoning_summary].rstrip!
  state[:reasoning_summary] << "\n\n"
  on_reasoning_boundary&.call
end

.codex_reasoning_summary_part_added(state, part) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 443

def codex_reasoning_summary_part_added(state, part)
  item = active_codex_item(state)
  return unless item&.fetch("type", nil) == "reasoning" && part.is_a?(Hash)

  item["summary"] ||= []
  item["summary"] << deep_dup_hash(part)
  state[:current_reasoning_content_part] = nil
end

.codex_response_items(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 797

def codex_response_items(state)
  state[:response_item_keys].filter_map { |key| state[:items_by_id][key] }
end

.codex_sse_error(event, provider_label: "Codex", request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 381

def codex_sse_error(event, provider_label: "Codex", request_error_class: nil)
  response = event["response"]
  error = event["error"] || (response["error"] if response.is_a?(Hash)) || {}
  message = if error.is_a?(Hash)
              [error["code"], error["message"]].compact.join(": ")
            else
              error.to_s
            end
  message = event["type"].to_s if message.empty?
  code = error.is_a?(Hash) && error["code"].to_s == "server_error" ? 500 : 400
  if request_error_class
    request_error_class.new(provider: provider_label, code: code, body: "#{event["type"]}: #{message}")
  else
    "#{event["type"]}: #{message}"
  end
end

.codex_sse_message(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 754

def codex_sse_message(state)
  message = { "role" => "assistant", "content" => codex_visible_content(state) }
  message["reasoning_summary"] = state[:reasoning_summary] unless state[:reasoning_summary].empty?
  message["tool_calls"] = state[:tool_calls] unless state[:tool_calls].empty?
  response_items = codex_response_items(state)
  message["response_items"] = response_items unless response_items.empty?
  message["usage"] = state[:usage] if state[:usage]
  message
end

.codex_sse_state(show_raw_reasoning: false) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 320

def codex_sse_state(show_raw_reasoning: false)
  {
    content: +"",
    raw_content: +"",
    emitted_message_keys: [],
    reasoning_summary: +"",
    raw_reasoning_visible: +"",
    pending_reasoning_delta: +"",
    show_raw_reasoning: show_raw_reasoning,
    tool_calls: [],
    response_item_keys: [],
    items_by_id: {},
    active_item_id: nil,
    current_text_content_part: nil,
    current_reasoning_content_part: nil,
    usage: nil
  }
end

.codex_streamable_message_item?(item) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kward/model/stream_parser.rb', line 784

def codex_streamable_message_item?(item)
  phase = codex_message_phase(item)
  phase.empty? || phase == "final_answer"
end

.codex_tool_arguments_delta(state, delta) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 594

def codex_tool_arguments_delta(state, delta)
  item = active_codex_item(state)
  return unless item && ["function_call", "custom_tool_call"].include?(item["type"])

  key = item["type"] == "custom_tool_call" ? "input" : "arguments"
  item[key] = item[key].to_s + delta.to_s
end

.codex_tool_arguments_done(state, arguments) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 602

def codex_tool_arguments_done(state, arguments)
  item = active_codex_item(state)
  return unless item&.fetch("type", nil) == "function_call"

  item["arguments"] = arguments.to_s
end

.codex_tool_call(item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 801

def codex_tool_call(item)
  return nil unless item.is_a?(Hash) && ["function_call", "custom_tool_call"].include?(item["type"])

  name = item["name"].to_s
  return nil if name.empty?

  arguments = item["arguments"] || item["input"] || "{}"
  arguments = JSON.dump(arguments) unless arguments.is_a?(String)
  {
    "id" => (item["call_id"] || item["id"] || "call_#{name}"),
    "type" => "function",
    "function" => { "name" => name, "arguments" => arguments }
  }
end

.codex_visible_content(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 764

def codex_visible_content(state)
  return state[:content] unless state[:content].empty?

  response_items = codex_response_items(state)
  visible_text = text_from_codex_items(visible_codex_message_items(response_items, tool_calls: state[:tool_calls]))
  return visible_text unless visible_text.empty?
  return "" unless state[:tool_calls].empty?

  state[:raw_content]
end

.codex_visible_reasoning_item(state, item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 621

def codex_visible_reasoning_item(state, item)
  return item unless item.is_a?(Hash) && item["type"] == "reasoning"

  visible = deep_dup_hash(item)
  sanitize_codex_reasoning_summary_item(visible)
  visible.delete("content") unless state[:show_raw_reasoning]
  return visible unless state[:show_raw_reasoning]
  return visible if visible["summary"].is_a?(Array) && !visible["summary"].empty?

  text = sanitize_codex_reasoning_text(raw_reasoning_from_codex_items([visible]))
  visible["summary"] = [{ "type" => "summary_text", "text" => text }] unless text.empty?
  visible
end

.collect_codex_item_output(state, item, on_assistant_delta: nil, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 649

def collect_codex_item_output(state, item, on_assistant_delta: nil, on_reasoning_delta: nil)
  case item["type"]
  when "message"
    text = text_from_codex_items([item])
    return if text.empty?

    key = codex_item_key(item)
    if codex_commentary_message_item?(item)
      unless state[:emitted_message_keys].include?(key)
        on_reasoning_delta&.call(text)
        state[:emitted_message_keys] << key
      end
      return
    end
    return unless codex_streamable_message_item?(item)

    state[:content] << text
    unless state[:emitted_message_keys].include?(key)
      on_assistant_delta&.call(text)
      state[:emitted_message_keys] << key
    end
  when "reasoning"
    text = sanitize_codex_reasoning_text(reasoning_summary_from_codex_items([item]))
    if state[:reasoning_summary].empty? && !text.empty?
      state[:reasoning_summary] << text
      on_reasoning_delta&.call(text)
    end
  when "function_call", "custom_tool_call"
    tool_call = codex_tool_call(item)
    state[:tool_calls] << tool_call if tool_call && !state[:tool_calls].any? { |call| call["id"] == tool_call["id"] }
  end
end

.compact_blank_codex_reasoning_lines(text) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 580

def compact_blank_codex_reasoning_lines(text)
  text.to_s.gsub(/(?:[ \t]*\n){3,}/, "\n\n")
end

.compact_codex_reasoning_delta_spacing(existing, text) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 584

def compact_codex_reasoning_delta_spacing(existing, text)
  text = compact_blank_codex_reasoning_lines(text)
  trailing_newlines = existing.to_s[/\n+\z/].to_s.length
  leading_newlines = text[/\A\n+/].to_s.length
  excess_newlines = trailing_newlines + leading_newlines - 2
  return text unless excess_newlines.positive? && leading_newlines.positive?

  text[[excess_newlines, leading_newlines].min..].to_s
end

.deep_dup(value) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 741

def deep_dup(value)
  case value
  when Hash
    value.each_with_object({}) { |(key, entry), result| result[key] = deep_dup(entry) }
  when Array
    value.map { |entry| deep_dup(entry) }
  when String
    value.dup
  else
    value
  end
end

.deep_dup_hash(hash) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 737

def deep_dup_hash(hash)
  deep_dup(hash)
end

.finalized_streaming_tool_calls(tool_calls) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 310

def finalized_streaming_tool_calls(tool_calls)
  tool_calls.compact.each_with_index.map do |tool_call, index|
    tool_call["id"] ||= "call_#{index}"
    tool_call["type"] ||= "function"
    tool_call["function"] ||= { "name" => "", "arguments" => "{}" }
    tool_call["function"]["arguments"] = "{}" if tool_call["function"]["arguments"].to_s.empty?
    tool_call
  end
end

.flush_codex_reasoning_delta(state, on_reasoning_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 541

def flush_codex_reasoning_delta(state, on_reasoning_delta: nil)
  pending = state[:pending_reasoning_delta].to_s
  state[:pending_reasoning_delta].clear
  text = sanitize_codex_reasoning_text(pending)
  append_codex_raw_reasoning_text(state, text, on_reasoning_delta: on_reasoning_delta) unless text.empty?
end

.from_claude_code_tool_name(name) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 286

def from_claude_code_tool_name(name)
  case name.to_s
  when "Read" then "read_file"
  when "Write" then "write_file"
  when "Edit" then "edit_file"
  when "Bash" then "run_shell_command"
  when "WebSearch" then "web_search"
  when "WebFetch" then "fetch_content"
  when "AskUserQuestion" then "ask_user_question"
  else name.to_s
  end
end

.gemini_sse_message(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 191

def gemini_sse_message(state)
  message = { "role" => "assistant", "content" => state[:content] }
  unless state[:calls].empty?
    message["tool_calls"] = state[:calls].values.map do |call|
      arguments = call["args_buffer"].empty? ? JSON.dump(call["args"]) : call["args_buffer"]
      { "id" => call["id"], "type" => "function", "function" => { "name" => call["name"], "arguments" => arguments } }
    end
  end
  message["usage"] = state[:usage] if state[:usage]
  message
end

.merge_codex_item(existing, update) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 717

def merge_codex_item(existing, update)
  return deep_dup_hash(update) unless existing.is_a?(Hash)

  merged = deep_dup_hash(existing)
  update.each do |key, value|
    next if value.nil?

    merged[key] = if key == "content" && merged[key].is_a?(Array) && value.is_a?(Array)
                    value.empty? ? merged[key] : value
                  elsif key == "summary" && merged[key].is_a?(Array) && value.is_a?(Array)
                    value.empty? ? merged[key] : value
                  elsif key == "arguments" && value.to_s.empty? && !merged[key].to_s.empty?
                    merged[key]
                  else
                    deep_dup(value)
                  end
  end
  merged
end

.merge_gemini_function_call(calls, function_call, candidate_index:, part_index:) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 177

def merge_gemini_function_call(calls, function_call, candidate_index:, part_index:)
  return unless function_call.is_a?(Hash)

  key = function_call["id"] || "#{candidate_index}:#{part_index}:#{function_call["name"]}"
  call = calls[key] ||= { "id" => function_call["id"] || "call_gemini_#{candidate_index}_#{part_index}", "name" => function_call["name"].to_s, "args" => {}, "args_buffer" => +"" }
  call["name"] = function_call["name"].to_s unless function_call["name"].to_s.empty?
  args = function_call["args"]
  if args.is_a?(Hash)
    call["args"].merge!(args)
  elsif !args.nil?
    call["args_buffer"] << args.to_s
  end
end

.merge_streaming_tool_call(tool_calls, delta) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 299

def merge_streaming_tool_call(tool_calls, delta)
  index = (delta["index"] || tool_calls.length).to_i
  tool_calls[index] ||= { "id" => nil, "type" => "function", "function" => { "name" => +"", "arguments" => +"" } }
  current = tool_calls[index]
  current["id"] = delta["id"] if delta["id"]
  current["type"] = delta["type"] if delta["type"]
  function = delta["function"] || {}
  current["function"]["name"] << function["name"].to_s if function["name"]
  current["function"]["arguments"] << function["arguments"].to_s if function["arguments"]
end

.openai_chat_sse_message(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 73

def openai_chat_sse_message(state)
  result = { "role" => "assistant", "content" => state[:content] }
  result["tool_calls"] = finalized_streaming_tool_calls(state[:tool_calls]) unless state[:tool_calls].empty?
  result["usage"] = state[:usage] if state[:usage]
  result
end

.openai_chat_sse_state ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 50

def openai_chat_sse_state
  { content: +"", tool_calls: [], usage: nil }
end

.parse_anthropic_sse_stream(response, on_reasoning_delta: nil, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 118

def parse_anthropic_sse_stream(response, on_reasoning_delta: nil, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil, request_error_class: nil)
  state = anthropic_sse_state
  buffer = +""
  response.read_body do |chunk|
    cancellation&.raise_if_cancelled!
    buffer << chunk
    while (index = buffer.index(/\r?\n\r?\n/))
      delimiter = Regexp.last_match[0]
      block = buffer[0...index]
      buffer = buffer[(index + delimiter.length)..] || +""
      process_anthropic_sse_block(block, state, on_reasoning_delta: on_reasoning_delta, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class)
    end
  end
  cancellation&.raise_if_cancelled!
  process_anthropic_sse_block(buffer, state, on_reasoning_delta: on_reasoning_delta, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class) unless buffer.empty?
  anthropic_sse_message(state)
rescue JSON::ParserError => e
  raise "Anthropic returned invalid SSE JSON: #{e.message}"
end

.parse_codex_sse(body, provider_label: "Codex", on_reasoning_delta: nil, on_reasoning_boundary: nil, on_assistant_delta: nil, show_raw_reasoning: false, usage_normalizer: nil, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 80

def parse_codex_sse(body, provider_label: "Codex", on_reasoning_delta: nil, on_reasoning_boundary: nil, on_assistant_delta: nil, show_raw_reasoning: false, usage_normalizer: nil, request_error_class: nil)
  state = codex_sse_state(show_raw_reasoning: show_raw_reasoning)
  body.split(/\r?\n\r?\n/).each do |block|
    process_codex_sse_block(block, state, provider_label: provider_label, on_reasoning_delta: on_reasoning_delta, on_reasoning_boundary: on_reasoning_boundary, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class)
  end
  flush_codex_reasoning_delta(state, on_reasoning_delta: on_reasoning_delta)
  codex_sse_message(state)
rescue JSON::ParserError => e
  raise "#{provider_label} returned invalid SSE JSON: #{e.message}"
end

.parse_codex_sse_stream(response, provider_label: "Codex", on_reasoning_delta: nil, on_reasoning_boundary: nil, on_assistant_delta: nil, cancellation: nil, show_raw_reasoning: false, usage_normalizer: nil, request_error_class: nil) ⇒ Object

Incrementally parses a Codex/Responses SSE HTTP response body.

Deltas are yielded as soon as complete SSE blocks arrive so interactive frontends can render streamed assistant and reasoning text without waiting for the provider to close the response.



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# File 'lib/kward/model/stream_parser.rb', line 96

def parse_codex_sse_stream(response, provider_label: "Codex", on_reasoning_delta: nil, on_reasoning_boundary: nil, on_assistant_delta: nil, cancellation: nil, show_raw_reasoning: false, usage_normalizer: nil, request_error_class: nil)
  state = codex_sse_state(show_raw_reasoning: show_raw_reasoning)
  buffer = +""

  response.read_body do |chunk|
    cancellation&.raise_if_cancelled!
    buffer << chunk
    while (index = buffer.index(/\r?\n\r?\n/))
      delimiter = Regexp.last_match[0]
      block = buffer[0...index]
      buffer = buffer[(index + delimiter.length)..] || +""
      process_codex_sse_block(block, state, provider_label: provider_label, on_reasoning_delta: on_reasoning_delta, on_reasoning_boundary: on_reasoning_boundary, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class)
    end
  end
  cancellation&.raise_if_cancelled!
  process_codex_sse_block(buffer, state, provider_label: provider_label, on_reasoning_delta: on_reasoning_delta, on_reasoning_boundary: on_reasoning_boundary, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class) unless buffer.empty?
  flush_codex_reasoning_delta(state, on_reasoning_delta: on_reasoning_delta)
  codex_sse_message(state)
rescue JSON::ParserError => e
  raise "#{provider_label} returned invalid SSE JSON: #{e.message}"
end

.parse_gemini_sse_stream(response, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 138

def parse_gemini_sse_stream(response, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil)
  state = { content: +"", calls: {}, usage: nil }
  buffer = +""
  response.read_body do |chunk|
    cancellation&.raise_if_cancelled!
    buffer << chunk
    while (index = buffer.index(/\r?\n\r?\n/))
      delimiter = Regexp.last_match[0]
      block = buffer[0...index]
      buffer = buffer[(index + delimiter.length)..] || +""
      process_gemini_sse_block(block, state, on_assistant_delta: on_assistant_delta, cancellation: cancellation, usage_normalizer: usage_normalizer)
    end
  end
  cancellation&.raise_if_cancelled!
  process_gemini_sse_block(buffer, state, on_assistant_delta: on_assistant_delta, cancellation: cancellation, usage_normalizer: usage_normalizer) unless buffer.empty?
  gemini_sse_message(state)
rescue JSON::ParserError => e
  raise "Google Gemini returned invalid SSE JSON: #{e.message}"
end

.parse_openai_chat_sse(body, on_assistant_delta: nil, usage_normalizer: nil, provider_label: "OpenAI-compatible provider") ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 16

def parse_openai_chat_sse(body, on_assistant_delta: nil, usage_normalizer: nil, provider_label: "OpenAI-compatible provider")
  state = openai_chat_sse_state
  body.split(/\r?\n\r?\n/).each do |block|
    process_openai_chat_sse_block(block, state, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer)
  end
  openai_chat_sse_message(state)
rescue JSON::ParserError => e
  raise "#{provider_label} returned invalid SSE JSON: #{e.message}"
end

.parse_openai_chat_sse_stream(response, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil, provider_label: "OpenAI-compatible provider") ⇒ Object

Incrementally parses a Chat Completions SSE HTTP response body. Local OpenAI-compatible servers stream this shape, so emit assistant deltas as complete SSE blocks arrive rather than waiting for connection close.



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# File 'lib/kward/model/stream_parser.rb', line 29

def parse_openai_chat_sse_stream(response, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil, provider_label: "OpenAI-compatible provider")
  state = openai_chat_sse_state
  buffer = +""

  response.read_body do |chunk|
    cancellation&.raise_if_cancelled!
    buffer << chunk
    while (index = buffer.index(/\r?\n\r?\n/))
      delimiter = Regexp.last_match[0]
      block = buffer[0...index]
      buffer = buffer[(index + delimiter.length)..] || +""
      process_openai_chat_sse_block(block, state, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer)
    end
  end
  cancellation&.raise_if_cancelled!
  process_openai_chat_sse_block(buffer, state, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer) unless buffer.empty?
  openai_chat_sse_message(state)
rescue JSON::ParserError => e
  raise "#{provider_label} returned invalid SSE JSON: #{e.message}"
end

.process_anthropic_sse_block(block, state, on_reasoning_delta: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 207

def process_anthropic_sse_block(block, state, on_reasoning_delta: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil)
  event_name = nil
  data = block.lines.filter_map do |line|
    event_name = line.delete_prefix("event:").strip if line.start_with?("event:")
    line.start_with?("data:") ? line.delete_prefix("data:").strip : nil
  end.join("\n")
  return if data.empty? || data == "[DONE]"
  raise anthropic_sse_error(data, request_error_class: request_error_class) if event_name == "error"

  event = JSON.parse(data)
  case event["type"]
  when "message_start"
    state[:usage] ||= usage_normalizer&.call(event.dig("message", "usage"))
  when "content_block_start"
    block_data = event["content_block"] || {}
    state[:blocks][event["index"].to_i] = block_data.merge("partial_json" => "")
    if block_data["type"] == "text"
      text = block_data["text"].to_s
      state[:content] << text
      on_assistant_delta&.call(text) unless text.empty?
    elsif block_data["type"] == "thinking"
      text = block_data["thinking"].to_s
      state[:reasoning_summary] << text
      on_reasoning_delta&.call(text) unless text.empty?
    end
  when "content_block_delta"
    current = state[:blocks][event["index"].to_i] ||= { "partial_json" => "" }
    delta = event["delta"] || {}
    case delta["type"]
    when "text_delta"
      text = delta["text"].to_s
      state[:content] << text
      on_assistant_delta&.call(text)
    when "thinking_delta"
      text = delta["thinking"].to_s
      state[:reasoning_summary] << text
      on_reasoning_delta&.call(text)
    when "input_json_delta"
      current["partial_json"] = current["partial_json"].to_s + delta["partial_json"].to_s
    end
  when "content_block_stop"
    block_data = state[:blocks][event["index"].to_i]
    tool_call = anthropic_tool_call(block_data)
    state[:tool_calls] << tool_call if tool_call
  when "message_delta"
    state[:usage] = usage_normalizer&.call(event["usage"]) || state[:usage]
  end
end

.process_codex_sse_block(block, state, provider_label: "Codex", on_reasoning_delta: nil, on_reasoning_boundary: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 339

def process_codex_sse_block(block, state, provider_label: "Codex", on_reasoning_delta: nil, on_reasoning_boundary: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil)
  data = block.lines.filter_map { |line| line.start_with?("data:") ? line.delete_prefix("data:").strip : nil }.join("\n")
  return if data.empty? || data == "[DONE]"

  event = JSON.parse(data)
  case event["type"]
  when "response.output_item.added"
    codex_output_item_added(state, event["item"])
  when "response.content_part.added"
    codex_content_part_added(state, event["part"])
  when "response.output_text.delta", "response.refusal.delta"
    codex_output_text_delta(state, event["delta"], on_reasoning_delta: on_reasoning_delta, on_assistant_delta: on_assistant_delta)
  when "response.reasoning_summary_part.added"
    codex_reasoning_summary_part_added(state, event["part"])
  when "response.reasoning_summary_text.delta"
    codex_reasoning_delta(state, event["delta"], on_reasoning_delta: on_reasoning_delta)
  when "response.reasoning_summary_part.done"
    codex_reasoning_part_done(state, on_reasoning_delta: on_reasoning_delta, on_reasoning_boundary: on_reasoning_boundary)
  when "response.reasoning_text.delta"
    codex_raw_reasoning_delta(state, event["delta"], on_reasoning_delta: on_reasoning_delta)
  when "response.reasoning_text.done"
    codex_raw_reasoning_done(state, event["text"], on_reasoning_delta: on_reasoning_delta)
  when "response.function_call_arguments.delta", "response.custom_tool_call_input.delta"
    codex_tool_arguments_delta(state, event["delta"])
  when "response.function_call_arguments.done"
    codex_tool_arguments_done(state, event["arguments"])
  when "response.output_item.done"
    codex_output_item_done(state, event["item"], on_assistant_delta: on_assistant_delta, on_reasoning_delta: on_reasoning_delta)
  when "response.completed"
    response = event["response"]
    state[:usage] ||= usage_normalizer&.call(response["usage"]) if response.is_a?(Hash)
    state[:usage] ||= usage_normalizer&.call(event["usage"])
    if response.is_a?(Hash) && response["output"].is_a?(Array) && state[:response_item_keys].empty?
      response["output"].each do |item|
        codex_output_item_done(state, item, on_assistant_delta: on_assistant_delta, on_reasoning_delta: on_reasoning_delta)
      end
    end
  when "response.failed", "response.incomplete"
    raise codex_sse_error(event, provider_label: provider_label, request_error_class: request_error_class)
  end
end

.process_gemini_sse_block(block, state, on_assistant_delta:, cancellation:, usage_normalizer:) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 158

def process_gemini_sse_block(block, state, on_assistant_delta:, cancellation:, usage_normalizer:)
  data = block.lines.filter_map { |line| line.start_with?("data:") ? line.delete_prefix("data:").strip : nil }.join("\n")
  return if data.empty? || data == "[DONE]"

  cancellation&.raise_if_cancelled!
  event = JSON.parse(data)
  Array(event["candidates"]).each_with_index do |candidate, candidate_index|
    Array(candidate.dig("content", "parts")).each_with_index do |part, part_index|
      text = part["text"].to_s
      unless text.empty?
        state[:content] << text
        on_assistant_delta&.call(text)
      end
      merge_gemini_function_call(state[:calls], part["functionCall"], candidate_index: candidate_index, part_index: part_index)
    end
  end
  state[:usage] = usage_normalizer&.call(event["usageMetadata"]) || state[:usage]
end

.process_openai_chat_sse_block(block, state, on_assistant_delta: nil, usage_normalizer: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 54

def process_openai_chat_sse_block(block, state, on_assistant_delta: nil, usage_normalizer: nil)
  data = block.lines.filter_map { |line| line.start_with?("data:") ? line.delete_prefix("data:").strip : nil }.join("\n")
  return if data.empty? || data == "[DONE]"

  event = JSON.parse(data)
  state[:usage] ||= usage_normalizer&.call(event["usage"])
  choice = Array(event["choices"]).first || {}
  delta = choice["delta"] || {}
  if delta["content"]
    text = delta["content"].to_s
    state[:content] << text
    on_assistant_delta&.call(text)
  end
  Array(delta["tool_calls"]).each { |tool_call| merge_streaming_tool_call(state[:tool_calls], tool_call) }
  message = choice["message"] || {}
  state[:content] << message["content"].to_s if state[:content].empty? && message["content"]
  Array(message["tool_calls"]).each { |tool_call| merge_streaming_tool_call(state[:tool_calls], tool_call) }
end

.raw_reasoning_from_codex_items(items) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 842

def raw_reasoning_from_codex_items(items)
  items.flat_map do |item|
    next [] unless item.is_a?(Hash) && item["type"] == "reasoning" && item["content"].is_a?(Array)

    item["content"].filter_map { |part| part["text"] if part.is_a?(Hash) && part["type"] == "reasoning_text" }
  end.join
end

.reasoning_summary_from_codex_items(items) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 830

def reasoning_summary_from_codex_items(items)
  items.flat_map do |item|
    next [] unless item.is_a?(Hash)

    if item["type"] == "reasoning" && item["summary"].is_a?(Array)
      item["summary"].filter_map { |part| part["text"] if part.is_a?(Hash) }
    else
      []
    end
  end.join
end

.remember_codex_item(state, item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 702

def remember_codex_item(state, item)
  key = codex_item_key(item)
  if state[:items_by_id].key?(key)
    stored = state[:items_by_id][key]
    stored.replace(merge_codex_item(stored, item))
  else
    state[:items_by_id][key] = item
    state[:response_item_keys] << key
  end
end

.sanitize_codex_reasoning_summary_item(item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 635

def sanitize_codex_reasoning_summary_item(item)
  return unless item["summary"].is_a?(Array)

  pending = +""
  item["summary"].each do |part|
    next unless part.is_a?(Hash) && part.key?("text")

    pending << part["text"].to_s
    sanitized = sanitize_codex_reasoning_text(pending, keep_incomplete_comment: true)
    part["text"] = sanitized[:text]
    pending.replace(sanitized[:pending])
  end
end

.sanitize_codex_reasoning_text(text, keep_incomplete_comment: false) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 556

def sanitize_codex_reasoning_text(text, keep_incomplete_comment: false)
  string = text.to_s
  visible = +""
  index = 0

  while (start_index = string.index("<!--", index))
    end_index = string.index("-->", start_index + 4)
    if end_index
      visible << string[index...start_index]
      index = end_index + 3
    elsif keep_incomplete_comment
      visible << string[index...start_index]
      return { text: visible, pending: string[start_index..] }
    else
      visible << string[index..]
      index = string.length
    end
  end

  visible << string[index..].to_s
  visible = compact_blank_codex_reasoning_lines(visible)
  keep_incomplete_comment ? { text: visible, pending: +"" } : visible
end

.split_trailing_comment_prefix(text) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 548

def split_trailing_comment_prefix(text)
  string = text.to_s
  prefix = ["<!-", "<!", "<"].find { |candidate| string.end_with?(candidate) }
  return [string, +""] unless prefix

  [string[0...-prefix.length], prefix.dup]
end

.text_from_codex_items(items) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 816

def text_from_codex_items(items)
  items.flat_map do |item|
    next [] unless item.is_a?(Hash)

    if ["output_text", "text"].include?(item["type"])
      item["text"].to_s
    elsif item["type"] == "message" && item["content"].is_a?(Array)
      item["content"].filter_map { |part| part["text"] if part.is_a?(Hash) && ["output_text", "text"].include?(part["type"]) }
    else
      []
    end
  end.join
end

.visible_codex_message_items(items, tool_calls: []) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 775

def visible_codex_message_items(items, tool_calls: [])
  messages = Array(items).select { |item| item.is_a?(Hash) && item["type"] == "message" }
  final_messages = messages.select { |item| codex_message_phase(item) == "final_answer" }
  return final_messages unless final_messages.empty?
  return [] unless tool_calls.empty?

  messages.reject { |item| codex_message_phase(item) == "commentary" }
end

.visible_codex_reasoning_delta(state, delta) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 533

def visible_codex_reasoning_delta(state, delta)
  state[:pending_reasoning_delta] << delta.to_s
  sanitized = sanitize_codex_reasoning_text(state[:pending_reasoning_delta], keep_incomplete_comment: true)
  text, pending_prefix = split_trailing_comment_prefix(sanitized[:text])
  state[:pending_reasoning_delta].replace(pending_prefix + sanitized[:pending])
  text
end