use crate::CitationStreamParser;use crate::ProposedPlanParser;use crate::ProposedPlanSegment;use crate::StreamTextChunk;use crate::StreamTextParser;#[derive(Debug, Clone, PartialEq, Eq, Default)]pub struct AssistantTextChunk {    pub visible_text: String,    pub citations: Vec<String>,    pub plan_segments: Vec<ProposedPlanSegment>,}impl AssistantTextChunk {    pub fn is_empty(&self) -> bool {        self.visible_text.is_empty() && self.citations.is_empty() && self.plan_segments.is_empty()    }}/// Parses assistant text streaming markup in one pass:/// - strips `<oai-mem-citation>` tags and extracts citation payloads/// - in plan mode, also strips `<proposed_plan>` blocks and emits plan segments#[derive(Debug, Default)]pub struct AssistantTextStreamParser {    plan_mode: bool,    citations: CitationStreamParser,    plan: ProposedPlanParser,}impl AssistantTextStreamParser {    pub fn new(plan_mode: bool) -> Self {        Self {            plan_mode,            ..Self::default()        }    }    pub fn push_str(&mut self, chunk: &str) -> AssistantTextChunk {        let citation_chunk = self.citations.push_str(chunk);        let mut out = self.parse_visible_text(citation_chunk.visible_text);        out.citations = citation_chunk.extracted;        out    }    pub fn finish(&mut self) -> AssistantTextChunk {        let citation_chunk = self.citations.finish();        let mut out = self.parse_visible_text(citation_chunk.visible_text);        if self.plan_mode {            let mut tail = self.plan.finish();            if !tail.is_empty() {                out.visible_text.push_str(&tail.visible_text);                out.plan_segments.append(&mut tail.extracted);            }        }        out.citations = citation_chunk.extracted;        out    }    fn parse_visible_text(&mut self, visible_text: String) -> AssistantTextChunk {        if !self.plan_mode {            return AssistantTextChunk {                visible_text,                ..AssistantTextChunk::default()            };        }        let plan_chunk: StreamTextChunk<ProposedPlanSegment> = self.plan.push_str(&visible_text);        AssistantTextChunk {            visible_text: plan_chunk.visible_text,            plan_segments: plan_chunk.extracted,            ..AssistantTextChunk::default()        }    }}#[cfg(test)]mod tests {    use super::AssistantTextStreamParser;    use crate::ProposedPlanSegment;    use pretty_assertions::assert_eq;    #[test]    fn parses_citations_across_seed_and_delta_boundaries() {        let mut parser = AssistantTextStreamParser::new(/*plan_mode*/ false);        let seeded = parser.push_str("hello <oai-mem-citation>doc");        let parsed = parser.push_str("1</oai-mem-citation> world");        let tail = parser.finish();        assert_eq!(seeded.visible_text, "hello ");        assert_eq!(seeded.citations, Vec::<String>::new());        assert_eq!(parsed.visible_text, " world");        assert_eq!(parsed.citations, vec!["doc1".to_string()]);        assert_eq!(tail.visible_text, "");        assert_eq!(tail.citations, Vec::<String>::new());    }    #[test]    fn parses_plan_segments_after_citation_stripping() {        let mut parser = AssistantTextStreamParser::new(/*plan_mode*/ true);        let seeded = parser.push_str("Intro\n<proposed");        let parsed = parser.push_str("_plan>\n- step <oai-mem-citation>doc</oai-mem-citation>\n");        let tail = parser.push_str("</proposed_plan>\nOutro");        let finish = parser.finish();        assert_eq!(seeded.visible_text, "Intro\n");        assert_eq!(            seeded.plan_segments,            vec![ProposedPlanSegment::Normal("Intro\n".to_string())]        );        assert_eq!(parsed.visible_text, "");        assert_eq!(parsed.citations, vec!["doc".to_string()]);        assert_eq!(            parsed.plan_segments,            vec![                ProposedPlanSegment::ProposedPlanStart,                ProposedPlanSegment::ProposedPlanDelta("- step \n".to_string()),            ]        );        assert_eq!(tail.visible_text, "Outro");        assert_eq!(            tail.plan_segments,            vec![                ProposedPlanSegment::ProposedPlanEnd,                ProposedPlanSegment::Normal("Outro".to_string()),            ]        );        assert!(finish.is_empty());    }}