Walkthrough

The PR introduces streaming finish handling to reasoning parsers by adding finish() methods and reasoning_completed properties to parser classes. State tracking for incomplete reasoning segments is added, and the finished flag is propagated through post-processing and response utilities to finalize reasoning content when streaming ends.

Changes

Sequence Diagram(s)

sequenceDiagram
    participant Streaming as Streaming Handler
    participant PostProc as PostProcess Handler
    participant Parser as Reasoning Parser
    participant State as Parser State

    Streaming->>PostProc: apply_reasoning_parser(text, streaming=true, finished=false)
    PostProc->>Parser: parse_delta(text)
    Parser->>State: Accumulate reasoning segment
    Parser-->>PostProc: (content, reasoning_content)
    PostProc-->>Streaming: (processed_content, reasoning)

    Note over Streaming: Stream continues...

    Streaming->>PostProc: apply_reasoning_parser(text, streaming=true, finished=true)
    PostProc->>Parser: parse_delta(final_text)
    PostProc->>Parser: finish()
    Parser->>State: Flush accumulated_reasoning
    Parser->>State: Check closing tag status
    Parser-->>PostProc: ReasoningParserResult
    PostProc->>PostProc: Merge finish result
    PostProc-->>Streaming: (final_content, final_reasoning)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

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