readseek 0.7.8

structural source reader with stable line hashes
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// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (c) 2026 Jarkko Sakkinen

//! Format-neutral indexed document model.

use std::path::{Path, PathBuf};

use anyhow::{Result, bail};
use serde::{Deserialize, Serialize};

#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
#[serde(rename_all = "lowercase")]
pub(crate) enum DocumentFormat {
    Pdf,
}

impl DocumentFormat {
    pub(crate) fn as_str(self) -> &'static str {
        match self {
            Self::Pdf => "pdf",
        }
    }

    pub(crate) fn parse(value: &str) -> Result<Self> {
        match value {
            "pdf" => Ok(Self::Pdf),
            _ => bail!("unsupported indexed document format: {value}"),
        }
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub(crate) struct Document {
    pub(crate) id: String,
    pub(crate) format: DocumentFormat,
    pub(crate) source: PathBuf,
    pub(crate) title: String,
    pub(crate) pages: usize,
    pub(crate) nodes: Vec<Node>,
    pub(crate) assets: Vec<Asset>,
}

impl Document {
    pub(crate) fn rebind_source(&mut self, path: &Path) {
        self.source = path.to_path_buf();
        path.file_stem()
            .and_then(|name| name.to_str())
            .unwrap_or("document")
            .clone_into(&mut self.title);
    }
}

#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize)]
#[serde(rename_all = "snake_case")]
pub(crate) enum NodeKind {
    Artifact,
    Footer,
    Header,
    Heading,
    MarginalLabel,
    Page,
    PageNumber,
    Paragraph,
    Section,
    StructuralSection,
}

impl NodeKind {
    pub(crate) fn as_str(self) -> &'static str {
        match self {
            Self::Artifact => "artifact",
            Self::Footer => "footer",
            Self::Header => "header",
            Self::Heading => "heading",
            Self::MarginalLabel => "marginal_label",
            Self::Page => "page",
            Self::PageNumber => "page_number",
            Self::Paragraph => "paragraph",
            Self::Section => "section",
            Self::StructuralSection => "structural_section",
        }
    }

    pub(crate) fn parse(value: &str) -> Result<Self> {
        match value {
            "artifact" => Ok(Self::Artifact),
            "footer" => Ok(Self::Footer),
            "header" => Ok(Self::Header),
            "heading" => Ok(Self::Heading),
            "marginal_label" => Ok(Self::MarginalLabel),
            "page" => Ok(Self::Page),
            "page_number" => Ok(Self::PageNumber),
            "paragraph" => Ok(Self::Paragraph),
            "section" => Ok(Self::Section),
            "structural_section" => Ok(Self::StructuralSection),
            _ => bail!("unsupported indexed node kind: {value}"),
        }
    }
}

impl argh::FromArgValue for NodeKind {
    fn from_arg_value(value: &str) -> std::result::Result<Self, String> {
        Self::parse(value).map_err(|error| error.to_string())
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub(crate) struct Node {
    pub(crate) id: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) parent_id: Option<String>,
    pub(crate) kind: NodeKind,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) title: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) text: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) level: Option<u8>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) column: Option<usize>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) source_anchor: Option<SourceAnchor>,
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub(crate) struct SourceAnchor {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) page: Option<usize>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) destination: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) bbox: Option<BoundingBox>,
}

#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
pub(crate) struct BoundingBox {
    pub(crate) x: f32,
    pub(crate) y: f32,
    pub(crate) width: f32,
    pub(crate) height: f32,
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub(crate) struct Asset {
    pub(crate) id: String,
    pub(crate) mime: String,
    pub(crate) path: PathBuf,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) source_anchor: Option<SourceAnchor>,
}