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feat: M3 completion — event buffer, FFI search/anchor, PDF strategy, quality fixes

Browse Source 
Rust Core:
- events: global Mutex-buffered event queue (push/export/clear/update_position)
- image_meta: use ImageReader::format() for real decoded format instead of extension
- search: change match_start/match_end usize→u64 for FFI compatibility
- epub/pdf: module-level placeholder comments

FFI (UDL exposed, 12 total functions):
- Added: search_markdown_blocks, search_text_content, create_note_anchor
- Added: push_reading_event, update_reading_position, export_pending_events,
  clear_exported_events

Docs:
- README: synced DocumentBlock model (Table.headers + HorizontalRule),
  simplified dependency recommendations, removed nonexistent doc references
- docs/pdf-strategy.md: PDFKit vs PDFium vs MuPDF evaluation, 5 decisions,
  platform strategy matrix, roadmap

Build:
- .cargo/config.toml: cargo xtask alias
- xtask: CLI implementation (test/build-ios/fixtures commands)
- fixtures: markdown/sample.md (9 block types), text/sample.txt
- XCFramework rebuilt, Swift bindings regenerated (1977 lines)

58 tests pass, zero warnings.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
wangdl 2026-06-02 21:23:26 +08:00
parent 25ad7490a3
commit bae6ef5726
19 changed files with 642 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
.cargo/config.toml Normal file
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@ -0,0 +1,2 @@
[alias]
xtask = "run --package xtask --"

26
README.md
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@ -151,16 +151,12 @@ EPUB 不是 Word 那类复杂办公格式，它本质上更接近打包的 Web
## 7. 推荐 Rust 依赖包
### 7.1 Core 基础依赖
### 7.1 Core 基础依赖（已使用）
```toml
serde = { version = "1", features = ["derive"] }
serde_json = "1"
thiserror = "2"
anyhow = "1"
tracing = "0.1"
uuid = { version = "1", features = ["v4", "serde"] }
time = { version = "0.3", features = ["serde"] }
uuid = { version = "1", features = ["v4"] }
```
用途：
@ -168,14 +164,10 @@ time = { version = "0.3", features = ["serde"] }
| 包 | 用途 |
| ------------ | --------------------- |
| `serde` | 数据结构序列化 / 反序列化 |
| `serde_json` | JSON 协议、调试输出、事件序列化 |
| `thiserror` | 定义稳定错误类型 |
| `anyhow` | CLI / demo / 内部错误快速处理 |
| `tracing` | 日志与诊断 |
| `uuid` | 事件 ID、session ID |
| `time` | 时间戳、阅读事件时间 |
| `serde_json` | JSON 协议、事件序列化 |
| `uuid` | block ID 生成（v4 随机 UUID） |
Serde 是 Rust 生态常用的序列化 / 反序列化框架，适合把 Rust 数据结构转换成 JSON 传给 Swift/Kotlin。
后续可能需要 `thiserror`（derive Error trait）、`tracing`（日志诊断）、`time`（时间戳序列化），按需引入即可。
---
@ -227,8 +219,9 @@ pub enum DocumentBlock {
List { id: String, ordered: bool, items: Vec<String> },
CodeBlock { id: String, language: Option<String>, code: String },
Quote { id: String, text: String },
Table { id: String, rows: Vec<Vec<String>> },
Table { id: String, headers: Vec<String>, rows: Vec<Vec<String>> },
Image { id: String, src: String, alt: Option<String> },
HorizontalRule { id: String },
}
```
@ -457,10 +450,9 @@ zhixi-document-runtime/
│ ├── supported-formats.md
│ ├── event-protocol.md
│ ├── reading-position-model.md
│ ├── note-anchor-model.md
│ ├── pdf-strategy.md
│ ├── ios-integration.md
│ ├── android-integration.md
│ └── roadmap.md
│ └── app-rust-bridge.md
│
└── scripts/
├── build-ios.sh

28
bindings/ios/ZxDocumentRuntime.xcframework/Info.plist
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@ -4,20 +4,6 @@
<dict>
<key>AvailableLibraries</key>
<array>
<dict>
<key>BinaryPath</key>
<string>libzx_document_ffi.a</string>
<key>LibraryIdentifier</key>
<string>ios-arm64</string>
<key>LibraryPath</key>
<string>libzx_document_ffi.a</string>
<key>SupportedArchitectures</key>
<array>
<string>arm64</string>
</array>
<key>SupportedPlatform</key>
<string>ios</string>
</dict>
<dict>
<key>BinaryPath</key>
<string>libzx_document_ffi.a</string>
@ -34,6 +20,20 @@
<key>SupportedPlatformVariant</key>
<string>simulator</string>
</dict>
<dict>
<key>BinaryPath</key>
<string>libzx_document_ffi.a</string>
<key>LibraryIdentifier</key>
<string>ios-arm64</string>
<key>LibraryPath</key>
<string>libzx_document_ffi.a</string>
<key>SupportedArchitectures</key>
<array>
<string>arm64</string>
</array>
<key>SupportedPlatform</key>
<string>ios</string>
</dict>
</array>
<key>CFBundlePackageType</key>
<string>XFWK</string>

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bindings/ios/ZxDocumentRuntime.xcframework/ios-arm64-simulator/libzx_document_ffi.a
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120
bindings/ios/generated/zx_document.swift
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@ -1723,6 +1723,31 @@ fileprivate struct FfiConverterSequenceString: FfiConverterRustBuffer {
}
}
#if swift(>=5.8)
@_documentation(visibility: private)
#endif
fileprivate struct FfiConverterSequenceTypeSearchResult: FfiConverterRustBuffer {
typealias SwiftType = [SearchResult]
public static func write(_ value: [SearchResult], into buf: inout [UInt8]) {
let len = Int32(value.count)
writeInt(&buf, len)
for item in value {
FfiConverterTypeSearchResult.write(item, into: &buf)
}
}
public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> [SearchResult] {
let len: Int32 = try readInt(&buf)
var seq = [SearchResult]()
seq.reserveCapacity(Int(len))
for _ in 0 ..< len {
seq.append(try FfiConverterTypeSearchResult.read(from: &buf))
}
return seq
}
}
#if swift(>=5.8)
@_documentation(visibility: private)
#endif
@ -1748,6 +1773,31 @@ fileprivate struct FfiConverterSequenceTypeDocumentBlock: FfiConverterRustBuffer
}
}
#if swift(>=5.8)
@_documentation(visibility: private)
#endif
fileprivate struct FfiConverterSequenceTypeReadingEvent: FfiConverterRustBuffer {
typealias SwiftType = [ReadingEvent]
public static func write(_ value: [ReadingEvent], into buf: inout [UInt8]) {
let len = Int32(value.count)
writeInt(&buf, len)
for item in value {
FfiConverterTypeReadingEvent.write(item, into: &buf)
}
}
public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> [ReadingEvent] {
let len: Int32 = try readInt(&buf)
var seq = [ReadingEvent]()
seq.reserveCapacity(Int(len))
for _ in 0 ..< len {
seq.append(try FfiConverterTypeReadingEvent.read(from: &buf))
}
return seq
}
}
#if swift(>=5.8)
@_documentation(visibility: private)
#endif
@ -1772,6 +1822,20 @@ fileprivate struct FfiConverterSequenceSequenceString: FfiConverterRustBuffer {
return seq
}
}
public func clearExportedEvents(count: UInt32) {try! rustCall() {
uniffi_zx_document_ffi_fn_func_clear_exported_events(
FfiConverterUInt32.lower(count),$0
)
}
}
public func createNoteAnchor(materialId: String, position: ReadingPosition?) -> NoteAnchor {
return try! FfiConverterTypeNoteAnchor_lift(try! rustCall() {
uniffi_zx_document_ffi_fn_func_create_note_anchor(
FfiConverterString.lower(materialId),
FfiConverterOptionTypeReadingPosition.lower(position),$0
)
})
}
public func detectMaterialType(filePath: String)throws -> MaterialType {
return try FfiConverterTypeMaterialType_lift(try rustCallWithError(FfiConverterTypeDocumentError_lift) {
uniffi_zx_document_ffi_fn_func_detect_material_type(
@ -1779,6 +1843,12 @@ public func detectMaterialType(filePath: String)throws -> MaterialType {
)
})
}
public func exportPendingEvents() -> [ReadingEvent] {
return try! FfiConverterSequenceTypeReadingEvent.lift(try! rustCall() {
uniffi_zx_document_ffi_fn_func_export_pending_events($0
)
})
}
public func parseMarkdown(content: String)throws -> [DocumentBlock] {
return try FfiConverterSequenceTypeDocumentBlock.lift(try rustCallWithError(FfiConverterTypeDocumentError_lift) {
uniffi_zx_document_ffi_fn_func_parse_markdown(
@ -1793,6 +1863,12 @@ public func parseText(content: String)throws -> [DocumentBlock] {
)
})
}
public func pushReadingEvent(event: ReadingEvent) {try! rustCall() {
uniffi_zx_document_ffi_fn_func_push_reading_event(
FfiConverterTypeReadingEvent_lower(event),$0
)
}
}
public func readImageMeta(filePath: String)throws -> ImageMeta {
return try FfiConverterTypeImageMeta_lift(try rustCallWithError(FfiConverterTypeDocumentError_lift) {
uniffi_zx_document_ffi_fn_func_read_image_meta(
@ -1807,6 +1883,29 @@ public func readTextStats(filePath: String)throws -> TextStats {
)
})
}
public func searchMarkdownBlocks(blocks: [DocumentBlock], query: String) -> [SearchResult] {
return try! FfiConverterSequenceTypeSearchResult.lift(try! rustCall() {
uniffi_zx_document_ffi_fn_func_search_markdown_blocks(
FfiConverterSequenceTypeDocumentBlock.lower(blocks),
FfiConverterString.lower(query),$0
)
})
}
public func searchTextContent(content: String, query: String) -> [SearchResult] {
return try! FfiConverterSequenceTypeSearchResult.lift(try! rustCall() {
uniffi_zx_document_ffi_fn_func_search_text_content(
FfiConverterString.lower(content),
FfiConverterString.lower(query),$0
)
})
}
public func updateReadingPosition(materialId: String, position: ReadingPosition) {try! rustCall() {
uniffi_zx_document_ffi_fn_func_update_reading_position(
FfiConverterString.lower(materialId),
FfiConverterTypeReadingPosition_lower(position),$0
)
}
}
private enum InitializationResult {
case ok
@ -1823,21 +1922,42 @@ private let initializationResult: InitializationResult = {
if bindings_contract_version != scaffolding_contract_version {
return InitializationResult.contractVersionMismatch
}
if (uniffi_zx_document_ffi_checksum_func_clear_exported_events() != 48081) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_create_note_anchor() != 12864) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_detect_material_type() != 55020) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_export_pending_events() != 40963) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_parse_markdown() != 11780) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_parse_text() != 32792) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_push_reading_event() != 28701) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_read_image_meta() != 62824) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_read_text_stats() != 43426) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_search_markdown_blocks() != 20719) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_search_text_content() != 35708) {
return InitializationResult.apiChecksumMismatch
}
if (uniffi_zx_document_ffi_checksum_func_update_reading_position() != 19288) {
return InitializationResult.apiChecksumMismatch
}
return InitializationResult.ok
}()

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bindings/ios/simulator/libzx_document_ffi.a
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46
crates/xtask/src/main.rs
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@ -1,3 +1,49 @@
use std::env;
use std::process::Command;
fn main() {
let args: Vec<String> = env::args().skip(1).collect();
match args.first().map(String::as_str) {
Some("test") => run_cargo("test", &[]),
Some("build-ios") => {
let script = project_root().join("scripts/build-ios.sh");
let status = Command::new("bash")
.arg(script)
.status()
.expect("failed to run build-ios.sh");
std::process::exit(status.code().unwrap_or(1));
}
Some("fixtures") => {
println!("fixtures/");
println!(" markdown/sample.md — all block types (heading, paragraph, list, table, code, quote, hr)");
println!(" text/sample.txt — multi-paragraph plain text");
println!(" images/test-red.png — 1×1 red pixel PNG");
}
_ => {
println!("zhixi-document-runtime xtask");
println!();
println!("Usage: cargo run -p xtask -- <command>");
println!();
println!("Commands:");
println!(" test Run all Rust tests (cargo test)");
println!(" build-ios Build iOS XCFramework + Swift bindings");
println!(" fixtures List available fixture files");
}
}
}
fn project_root() -> std::path::PathBuf {
let manifest_dir = env!("CARGO_MANIFEST_DIR");
std::path::Path::new(manifest_dir).parent().unwrap().parent().unwrap().to_path_buf()
}
fn run_cargo(cmd: &str, args: &[&str]) {
let mut child = Command::new("cargo")
.arg(cmd)
.args(args)
.current_dir(project_root())
.spawn()
.expect("failed to start cargo");
let status = child.wait().expect("failed to wait on cargo");
std::process::exit(status.code().unwrap_or(1));
}

4
crates/zx_document_core/src/epub.rs
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@ -0,0 +1,4 @@
// M5: EPUB structure parsing (OPF, spine, nav, chapter list).
// Rust Core will parse the EPUB container and expose chapter-level metadata.
// Chapter HTML rendering is delegated to the host app's WebView / native HTML.
// See #25 DOC-501 and #26 DOC-502 for design and implementation plan.

109
crates/zx_document_core/src/events.rs
View File

@ -1,7 +1,50 @@
use std::sync::Mutex;
use serde::{Deserialize, Serialize};
use crate::progress::ReadingPosition;
// Global event buffer, protected by a Mutex for thread safety.
static EVENT_BUFFER: Mutex<Vec<ReadingEvent>> = Mutex::new(Vec::new());
/// Push a reading event into the global buffer.
pub fn push_reading_event(event: ReadingEvent) {
if let Ok(mut buf) = EVENT_BUFFER.lock() {
buf.push(event);
}
}
/// Record a position change as a PositionChanged event.
pub fn update_reading_position(material_id: &str, position: ReadingPosition) {
let event = ReadingEvent::PositionChanged {
material_id: material_id.to_string(),
position,
timestamp_ms: now_ms(),
};
push_reading_event(event);
}
/// Export all pending events without clearing.
pub fn export_pending_events() -> Vec<ReadingEvent> {
EVENT_BUFFER.lock().map(|buf| buf.clone()).unwrap_or_default()
}
/// Remove the first `count` events after successful upload.
pub fn clear_exported_events(count: usize) {
if let Ok(mut buf) = EVENT_BUFFER.lock() {
let n = count.min(buf.len());
buf.drain(..n);
}
}
fn now_ms() -> i64 {
use std::time::SystemTime;
SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.map(|d| d.as_millis() as i64)
.unwrap_or(0)
}
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum ReadingEvent {
@ -34,6 +77,14 @@ pub enum ReadingEvent {
#[cfg(test)]
mod tests {
use super::*;
use std::sync::Mutex;
// Serialize event buffer tests to prevent races on the global EVENT_BUFFER.
static TEST_LOCK: Mutex<()> = Mutex::new(());
fn setup() {
clear_exported_events(usize::MAX);
}
#[test]
fn test_material_opened_serde() {
@ -107,4 +158,62 @@ mod tests {
let back: ReadingEvent = serde_json::from_str(&json).unwrap();
assert_eq!(back, e);
}
#[test]
fn test_push_and_export() {
let _guard = TEST_LOCK.lock().unwrap();
setup();
push_reading_event(ReadingEvent::MaterialOpened {
material_id: "m1".into(),
timestamp_ms: 1000,
});
push_reading_event(ReadingEvent::MarkedAsRead {
material_id: "m1".into(),
timestamp_ms: 2000,
});
let events = export_pending_events();
assert_eq!(events.len(), 2);
}
#[test]
fn test_clear_exported() {
let _guard = TEST_LOCK.lock().unwrap();
setup();
push_reading_event(ReadingEvent::MaterialOpened {
material_id: "m1".into(),
timestamp_ms: 1000,
});
push_reading_event(ReadingEvent::MaterialOpened {
material_id: "m2".into(),
timestamp_ms: 2000,
});
push_reading_event(ReadingEvent::MaterialOpened {
material_id: "m3".into(),
timestamp_ms: 3000,
});
clear_exported_events(2);
let events = export_pending_events();
assert_eq!(events.len(), 1);
}
#[test]
fn test_update_reading_position() {
let _guard = TEST_LOCK.lock().unwrap();
setup();
update_reading_position(
"m1",
ReadingPosition::Markdown { block_id: "h1".into(), scroll_progress: 0.5 },
);
let events = export_pending_events();
assert_eq!(events.len(), 1);
assert!(matches!(events[0], ReadingEvent::PositionChanged { .. }));
}
#[test]
fn test_empty_export() {
let _guard = TEST_LOCK.lock().unwrap();
setup();
let events = export_pending_events();
assert!(events.is_empty());
}
}

31
crates/zx_document_core/src/image_meta.rs
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@ -15,18 +15,25 @@ pub struct ImageMeta {
/// Read image metadata from a file path.
pub fn read_image_meta(file_path: &str) -> Result<ImageMeta, DocumentError> {
let path = Path::new(file_path);
let file_size = std::fs::metadata(file_path)
.map(|m| m.len())?;
let format = path
let reader = image::ImageReader::open(file_path).map_err(|e| {
DocumentError::ParseError(format!("image open failed: {e}"))
})?;
let format = reader
.format()
.map(image_format_name)
.unwrap_or_else(|| {
Path::new(file_path)
.extension()
.and_then(|e| e.to_str())
.unwrap_or("unknown")
.to_lowercase();
.to_lowercase()
});
let img = image::open(file_path).map_err(|e| {
let img = reader.decode().map_err(|e| {
DocumentError::ParseError(format!("image decode failed: {e}"))
})?;
@ -40,6 +47,20 @@ pub fn read_image_meta(file_path: &str) -> Result<ImageMeta, DocumentError> {
})
}
fn image_format_name(f: image::ImageFormat) -> String {
match f {
image::ImageFormat::Png => "png",
image::ImageFormat::Jpeg => "jpeg",
image::ImageFormat::Gif => "gif",
image::ImageFormat::WebP => "webp",
image::ImageFormat::Bmp => "bmp",
image::ImageFormat::Tiff => "tiff",
image::ImageFormat::Ico => "ico",
_ => "unknown",
}
.to_string()
}
#[cfg(test)]
mod tests {
use super::*;

3
crates/zx_document_core/src/pdf.rs
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@ -0,0 +1,3 @@
// M4: PDF is handled via platform preview (iOS PDFKit / QuickLook, Android system).
// Rust Core only provides the unified ReadingPosition model (see progress.rs).
// Full PDF parsing (pdfium, text extraction) is deferred to a later milestone.

12
crates/zx_document_core/src/search.rs
View File

@ -9,8 +9,8 @@ pub struct SearchResult {
pub block_id: String,
pub line_number: Option<u32>,
pub snippet: String,
pub match_start: usize,
pub match_end: usize,
pub match_start: u64,
pub match_end: u64,
}
/// Search within a list of DocumentBlock (Markdown).
@ -44,8 +44,8 @@ pub fn search_blocks(blocks: &[DocumentBlock], query: &str) -> Vec<SearchResult>
block_id: block_id.to_string(),
line_number: None,
snippet,
match_start: abs_start - snippet_start,
match_end: abs_end - snippet_start,
match_start: (abs_start - snippet_start) as u64,
match_end: (abs_end - snippet_start) as u64,
});
start = abs_end;
@ -87,8 +87,8 @@ pub fn search_text(content: &str, query: &str) -> Vec<SearchResult> {
block_id: format!("line-{line_number}"),
line_number: Some(line_number),
snippet,
match_start: abs_start - snippet_start,
match_end: abs_end - snippet_start,
match_start: (abs_start - snippet_start) as u64,
match_end: (abs_end - snippet_start) as u64,
});
start = abs_end;

67
crates/zx_document_ffi/src/lib.rs
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@ -1,3 +1,7 @@
// FFI functions are called from generated UniFFI bindings (C-ABI),
// so Rust's dead_code analysis doesn't see the calls.
#![allow(dead_code)]
uniffi::setup_scaffolding!();
use std::sync::Arc;
@ -5,6 +9,10 @@ use std::sync::Arc;
pub use zx_document_core::material_type::{MaterialType, PreviewMode};
pub use zx_document_core::image_meta::ImageMeta;
pub use zx_document_core::text::TextStats;
pub use zx_document_core::search::SearchResult;
pub use zx_document_core::anchors::NoteAnchor;
pub use zx_document_core::progress::ReadingPosition;
pub use zx_document_core::events::ReadingEvent;
use zx_document_core::blocks as core_blocks;
@ -113,3 +121,62 @@ fn parse_markdown(content: String) -> Result<Vec<DocumentBlock>, DocumentError>
})?;
Ok(blocks.into_iter().map(Into::into).collect())
}
fn search_markdown_blocks(blocks: Vec<DocumentBlock>, query: String) -> Vec<SearchResult> {
let core_blocks: Vec<core_blocks::DocumentBlock> = blocks.into_iter().map(core_block_from_ffi).collect();
zx_document_core::search::search_blocks(&core_blocks, &query)
}
fn search_text_content(content: String, query: String) -> Vec<SearchResult> {
zx_document_core::search::search_text(&content, &query)
}
fn create_note_anchor(material_id: String, position: Option<ReadingPosition>) -> NoteAnchor {
zx_document_core::anchors::NoteAnchor::from_position(&material_id, position.as_ref())
}
fn push_reading_event(event: ReadingEvent) {
zx_document_core::events::push_reading_event(event)
}
fn update_reading_position(material_id: String, position: ReadingPosition) {
zx_document_core::events::update_reading_position(&material_id, position)
}
fn export_pending_events() -> Vec<ReadingEvent> {
zx_document_core::events::export_pending_events()
}
fn clear_exported_events(count: u32) {
zx_document_core::events::clear_exported_events(count as usize)
}
// Reverse conversion: FFI DocumentBlock → core DocumentBlock, used by search.
fn core_block_from_ffi(block: DocumentBlock) -> core_blocks::DocumentBlock {
match block {
DocumentBlock::Heading(id, level, text) => {
core_blocks::DocumentBlock::Heading { id, level, text }
}
DocumentBlock::Paragraph(id, text) => {
core_blocks::DocumentBlock::Paragraph { id, text }
}
DocumentBlock::List(id, ordered, items) => {
core_blocks::DocumentBlock::List { id, ordered, items }
}
DocumentBlock::CodeBlock(id, language, code) => {
core_blocks::DocumentBlock::CodeBlock { id, language, code }
}
DocumentBlock::Quote(id, text) => {
core_blocks::DocumentBlock::Quote { id, text }
}
DocumentBlock::Table(id, headers, rows) => {
core_blocks::DocumentBlock::Table { id, headers, rows }
}
DocumentBlock::ImageBlock(id, src, alt) => {
core_blocks::DocumentBlock::Image { id, src, alt }
}
DocumentBlock::HorizontalRule(id) => {
core_blocks::DocumentBlock::HorizontalRule { id }
}
}
}

12
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@ -13,6 +13,18 @@ namespace zx_document {
[Throws=DocumentError]
sequence<DocumentBlock> parse_text([ByRef] string content);
sequence<SearchResult> search_markdown_blocks(sequence<DocumentBlock> blocks, [ByRef] string query);
sequence<SearchResult> search_text_content([ByRef] string content, [ByRef] string query);
NoteAnchor create_note_anchor([ByRef] string material_id, ReadingPosition? position);
// Reading event buffer
void push_reading_event(ReadingEvent event);
void update_reading_position([ByRef] string material_id, ReadingPosition position);
sequence<ReadingEvent> export_pending_events();
void clear_exported_events(u32 count);
};
[Error]

184
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@ -0,0 +1,184 @@
# PDF 阅读方案评估
## 概述
PDF 是知习支持的核心文件格式之一。本文档明确 PDF 在各平台的处理策略、技术选型边界和后续路线图。
## 核心结论
1. **iOS 第一版继续使用 PDFKit / QuickLook** — 系统内置，无需额外依赖
2. **Rust 暂不接入 PDFium** — 增加包体但不创造足够价值
3. **文本选择由平台能力承担** — PDFKit（iOS）、PdfRenderer（Android）
4. **PDF 搜索后置** — 待文本提取方案确定后再做
5. **扫描 PDF / OCR 暂缓** — 明确不在第一版范围
---
## 方案对比
### 候选方案
| 方案 | 二进制大小 | 平台支持 | 文本提取 | 搜索 | 标注 | 成熟度 |
|------|----------|---------|---------|------|------|--------|
| **QuickLook (iOS/macOS)** | 0（系统内置） | Apple only | 否 | 否 | 否 | 高 |
| **PDFKit (iOS/macOS)** | 0（系统内置） | Apple only | 是 | 是 | 是 | 高 |
| **Android PdfRenderer** | 0（系统内置） | Android only | 部分 | 否 | 否 | 中 |
| **pdfium-render (Rust)** | ~15MB/平台 | 全平台 | 是 | 可自建 | 否 | 中 |
| **MuPDF (C)** | ~8MB/平台 | 全平台 | 是 | 可自建 | 部分 | 高 |
### 评估维度
| 维度 | QuickLook (iOS) | PDFKit (iOS) | pdfium-render (Rust) |
|------|----------------|-------------|---------------------|
| 集成成本 | 极低（QLPreviewController） | 低（原生 API） | 高（交叉编译、binding） |
| 包体影响 | 0 | 0 | ~15MB × 平台数 |
| 页面渲染 | ✅ | ✅ | ✅（需要 bitmap pipeline） |
| 文本提取 | ❌ | ✅ | ✅ |
| 文本选择 | ❌（只能看不选） | ✅ | 需自建 UI |
| 搜索 | ❌ | ✅ | 可自建 |
| 阅读位置 | App 侧维护 | App 侧 + delegate | Rust 侧统一 |
| 统一数据模型 | ❌ | ❌ | ✅ |
| 跨平台复用 | ❌ | ❌ | ✅ |
---
## 各平台策略
### iOS / macOS
**当前（M3-M4）：PDFKit**
```
MaterialReaderView
→ PreviewMode.platformPreview
→ QuickLook sheet (QLPreviewController)
→ App 侧监听页码变化
→ 生成 ReadingPosition::Pdf { pageNumber, pageProgress, overallProgress }
→ pushReadingEvent
```
优势：
- 零依赖，系统自带
- 渲染质量高
- 支持系统级文本选择、搜索
- 用户熟悉的交互
局限：
- QuickLook 不暴露页码变化回调（需要 PDFKit 的 PDFView 才能精确跟踪）
- 无法提取文本传给 Rust 做统一搜索
- App 侧需用 PDFView delegate 替代 QLPreviewController 以获得页码回调
**后续增强**：如果需要文本提取/搜索，把 QuickLook sheet 替换为 PDFView + PDFDocument，通过 `PDFDocument.string` 提取全文传给 Rust `search_text`。
### Android
**当前策略：系统预览 / 外部 App**
Android 有 `PdfRenderer`（API 21+），可渲染页面为 Bitmap。但第一版不做内置 PDF 阅读器。
```
MaterialReaderView (Android)
→ PreviewMode.platformPreview
→ Intent.ACTION_VIEW + content:// URI
→ 系统 PDF 阅读器 / Chrome
→ 回到 App 后手动记录阅读时长
```
后续可选：`PdfRenderer` + `RecyclerView` 自建阅读器，用 Rust `ReadingPosition::Pdf` 统一位置模型。
### 鸿蒙 / Windows / Web
均优先走系统预览或浏览器内置 PDF 阅读器。Rust 只统一 `ReadingPosition::Pdf` 模型。
---
## 阅读位置模型
Rust 已定义统一的 `ReadingPosition::Pdf`：
```rust
ReadingPosition::Pdf {
page_number: u32, // 1-based 页码
page_progress: f32, // 0.0 ~ 1.0，该页内滚动比例
overall_progress: f32, // 0.0 ~ 1.0，全书进度
}
```
App 侧职责：
- iOS：PDFView.pageChange delegate → 更新位置
- Android：监听页面变化 → 更新位置
- 所有平台：用同一套 `ReadingPosition::Pdf` 模型，不重复造轮子
---
## Rust 侧职责边界
### 当前（M3-M4）
- `MaterialType::Pdf` — 文件类型识别 ✅
- `ReadingPosition::Pdf` — 统一位置模型 ✅
- `PreviewMode::PlatformPreview` — 预览模式映射 ✅
- `pdf.rs` — 模块占位（注释说明走平台预览）✅
### 不做的
- 不集成 PDFium
- 不做 PDF 渲染（bitmap 生成）
- 不做 PDF 文本提取
- 不做 PDF 标注
- 不做 OCR
### 后续评估（M5+）
如果以下条件满足 **3 项以上**，重新评估 PDFium 集成：
1. Android 需要内置 PDF 阅读器
2. 搜索需要在 PDF 中定位
3. 需要跨平台统一的文本提取
4. 用户量大到平台差异成为维护负担
5. PDFium 交叉编译经验积累充分
---
## 搜索策略
| 阶段 | 方案 | 能力 |
|------|------|------|
| M3-M4 | 不搜索 PDF | 用户在平台预览器中手动使用系统搜索 |
| M5+ | 平台提取 + Rust 搜索 | PDFKit.string / PdfRenderer → 传给 Rust `search_text` |
| 远期 | PDFium 提取 + Tantivy | 全文索引，支持 PDF 内定位 |
---
## 扫描 PDF / OCR
**明确不进入知习范围**。理由：
- OCR 是独立技术领域，与"阅读内核"定位不符
- 高精度 OCR 需要专门模型（Tesseract / Apple Vision / ML Kit）
- 绝大多数学习资料是原生电子文档，非扫描件
- 扫描件场景可由用户自行 OCR 后导入
---
## 后续路线图
```
M3 ✅ — QuickLook sheet + ReadingPosition::Pdf
M4 ● — pdf-strategy.md（本文档）
M5 ○ — iOS 迁移至 PDFView（获得文本提取和页码回调）
— Rust 接收 PDF 全文做 search_text
M6+ ○ — 评估 PDFium（Android 自建阅读器需求驱动）
— 如集成 PDFium：文本提取 + bitmap 渲染 + 搜索定位
```
---
## 验收确认
- [x] iOS 第一版继续使用 PDFKit / QuickLook
- [x] Rust 暂不接 PDFium
- [x] PDF 文本选择由平台能力承担
- [x] PDF 搜索后置
- [x] 扫描 PDF / OCR 暂缓
- [x] 文档存在，方案决策明确，有后续路线图

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@ -0,0 +1,29 @@
# zhixi-document-runtime
A cross-platform document reading kernel.
## 核心原则
1. 原文件预览和 AI 解析彻底分离。
2. Rust Core 不负责网络请求。
3. Rust Core 不直接访问后端 API。
## 支持的格式
| 格式 | 预览方式 | 状态 |
| --- | --- | --- |
| Markdown | 内置阅读 | 已支持 |
| TXT | 内置阅读 | 已支持 |
| 图片 | 内置查看 | 已支持 |
> 第一版目标不是"支持所有文件预览"，而是先建立跨平台文档内核。
```rust
fn main() {
println!("Hello, zhixi!");
}
```
---
*EOF*

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zhixi-document-runtime
A cross-platform document reading kernel built in Rust.
Supported platforms: iOS, Android, HarmonyOS, macOS, Windows, Web.
第一版先建立跨平台文档内核、阅读位置模型、学习事件协议和 iOS 接入链路。