rsclaw 2026.5.20

AI Agent Engine Compatible with OpenClaw
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//! Where inside a doc a chunk lives. Renders to a human-readable
//! citation string for retrieval responses (`p.12`, `§A > B`, …).

use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum KbLocator {
    PdfPage {
        page: u32,
        bbox: Option<(f32, f32, f32, f32)>,
    },
    MdSection {
        heading_path: Vec<String>,
    },
    UrlAnchor {
        fragment: Option<String>,
    },
    ChatMsgs {
        first_ts: i64,
        last_ts: i64,
    },
    Image {
        bbox: Option<(f32, f32, f32, f32)>,
    },
    Offset {
        start: usize,
        end: usize,
    },
}

impl KbLocator {
    pub fn human(&self) -> String {
        match self {
            Self::PdfPage { page, .. } => format!("p.{page}"),
            Self::MdSection { heading_path } => {
                if heading_path.is_empty() {
                    String::from("§")
                } else {
                    format!("§{}", heading_path.join(" > "))
                }
            }
            Self::UrlAnchor { fragment } => fragment
                .as_deref()
                .map(|f| format!("#{f}"))
                .unwrap_or_default(),
            Self::ChatMsgs { first_ts, last_ts } => format!("{first_ts}..{last_ts}"),
            Self::Image { .. } => String::from("image"),
            Self::Offset { start, end } => format!("bytes {start}..{end}"),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn human_format() {
        assert_eq!(
            KbLocator::PdfPage {
                page: 12,
                bbox: None
            }
            .human(),
            "p.12"
        );
        assert_eq!(
            KbLocator::MdSection {
                heading_path: vec!["A".into(), "B".into()]
            }
            .human(),
            "§A > B"
        );
        assert_eq!(
            KbLocator::MdSection {
                heading_path: vec![]
            }
            .human(),
            "§"
        );
        assert_eq!(
            KbLocator::UrlAnchor {
                fragment: Some("s1".into())
            }
            .human(),
            "#s1"
        );
        assert_eq!(KbLocator::UrlAnchor { fragment: None }.human(), "");
        assert_eq!(KbLocator::Image { bbox: None }.human(), "image");
        assert_eq!(KbLocator::Offset { start: 0, end: 5 }.human(), "bytes 0..5");
        assert_eq!(
            KbLocator::ChatMsgs {
                first_ts: 100,
                last_ts: 200
            }
            .human(),
            "100..200"
        );
    }

    #[test]
    fn serde_roundtrip() {
        let l = KbLocator::PdfPage {
            page: 7,
            bbox: Some((1.0, 2.0, 3.0, 4.0)),
        };
        let s = serde_json::to_string(&l).unwrap();
        let back: KbLocator = serde_json::from_str(&s).unwrap();
        assert_eq!(l, back);
    }
}