docparser-pdf 0.2.1

//! PDF 两种版式模式对照：`auto`（行归并 + 表格 + 分栏）与 `raw`（按内容流顺序）。
//!
//! ```bash
//! cargo run -p docparser-pdf --example layout_modes -- doc.pdf
//! ```
//!
//! 无 PDFium 时自动回退 `pdf-extract` 兜底后端（无 bbox，版式模式退化为 raw 语义）。

use docparser_core::engine::DocumentEngine;
use docparser_core::plugins;
use docparser_core::registry::Registry;
use docparser_pdf::{LayoutMode, PdfOptions};

fn engine_with(mode: LayoutMode, max_pages: Option<usize>) -> DocumentEngine {
    let mut registry = Registry::new();
    plugins::text::register_defaults(&mut registry);
    let mut options = PdfOptions::new().with_layout_mode(mode);
    options.max_pages = max_pages;
    // 与 CLI 同一条装配路径：register_with 把选项注入 worker / 兜底后端 / 插件
    docparser_pdf::register_with(&mut registry, &options);
    DocumentEngine::new(registry)
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let path = std::env::args()
        .nth(1)
        .unwrap_or_else(|| "doc.pdf".to_string());

    for mode in [LayoutMode::Auto, LayoutMode::Raw] {
        match engine_with(mode, Some(3)).parse(&path) {
            Ok(doc) => {
                let blocks: usize = doc.pages.iter().map(|p| p.blocks.len()).sum();
                println!(
                    "{:>7}: {} 页 / {} 块 / {} 字符",
                    mode.as_str(),
                    doc.pages.len(),
                    blocks,
                    doc.meta.text_length
                );
                if let Some(page) = doc.pages.first() {
                    for block in page.blocks.iter().take(3) {
                        println!("         {:?}: {}", block.kind, block.content);
                    }
                }
            }
            Err(e) => println!("{:>7}: 失败 [{}] {}", mode.as_str(), e.code, e.message),
        }
    }
    Ok(())
}