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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 584

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 569

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 159

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 181

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 106

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 167

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 420

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 406

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_content_part_added(state, part) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 313

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 580

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 600

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 675

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 301

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 505

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_assistant_delta: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 323

def codex_output_text_delta(state, delta, 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
  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 355

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 374

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 348

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) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 394

def codex_reasoning_part_done(state, on_reasoning_delta: 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)
  text = "\n\n"
  item["summary"].last["text"] = item["summary"].last["text"].to_s + text
  state[:reasoning_summary] << text
  on_reasoning_delta&.call(text)
end

.codex_reasoning_summary_part_added(state, part) ⇒ Object 



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

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 679

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

.codex_sse_error(event, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 284

def codex_sse_error(event, 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: "Codex", 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 641

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 223

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 671

def codex_streamable_message_item?(item)
  codex_message_phase(item) == "final_answer"
end

.codex_tool_arguments_delta(state, delta) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 490

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 498

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 683

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 651

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 517

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 545

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? || !codex_streamable_message_item?(item)

    state[:content] << text
    key = codex_item_key(item)
    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 476

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 480

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 628

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 624

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 213

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 437

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 189

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

.merge_codex_item(existing, update) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 604

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_streaming_tool_call(tool_calls, delta) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 202

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

.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 86

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, on_reasoning_delta: 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 48

def parse_codex_sse(body, on_reasoning_delta: 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, on_reasoning_delta: on_reasoning_delta, 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 "Codex OAuth returned invalid SSE JSON: #{e.message}"
end

.parse_codex_sse_stream(response, on_reasoning_delta: 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 64

def parse_codex_sse_stream(response, on_reasoning_delta: 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, 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_codex_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?
  flush_codex_reasoning_delta(state, on_reasoning_delta: on_reasoning_delta)
  codex_sse_message(state)
rescue JSON::ParserError => e
  raise "Codex OAuth returned invalid SSE JSON: #{e.message}"
end

.parse_openai_chat_sse(body, on_assistant_delta: nil, usage_normalizer: nil) ⇒ 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)
  content = +""
  tool_calls = []
  usage = nil
  body.split(/\r?\n\r?\n/).each do |block|
    data = block.lines.filter_map { |line| line.start_with?("data:") ? line.delete_prefix("data:").strip : nil }.join("\n")
    next if data.empty? || data == "[DONE]"

    event = JSON.parse(data)
    usage ||= usage_normalizer&.call(event["usage"])
    choice = Array(event["choices"]).first || {}
    delta = choice["delta"] || {}
    if delta["content"]
      text = delta["content"].to_s
      content << text
      on_assistant_delta&.call(text)
    end
    Array(delta["tool_calls"]).each do |tool_call|
      merge_streaming_tool_call(tool_calls, tool_call)
    end
    message = choice["message"] || {}
    content << message["content"].to_s if content.empty? && message["content"]
    Array(message["tool_calls"]).each { |tool_call| merge_streaming_tool_call(tool_calls, tool_call) }
  end
  result = { "role" => "assistant", "content" => content }
  result["tool_calls"] = finalized_streaming_tool_calls(tool_calls) unless tool_calls.empty?
  result["usage"] = usage if usage
  result
rescue JSON::ParserError => e
  raise "Copilot 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 110

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, 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 242

def process_codex_sse_block(block, state, on_reasoning_delta: 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_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)
  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, request_error_class: request_error_class)
  end
end

.raw_reasoning_from_codex_items(items) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 724

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 712

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 589

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 531

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 452

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 444

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 698

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 662

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 429

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