fix: 优化markdown解析器

This commit is contained in:
imeepos 2025-07-22 16:43:17 +08:00
parent ba2ff0a2b0
commit eb9ec73889
3 changed files with 478 additions and 58 deletions

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@ -0,0 +1,143 @@
# Markdown解析器byte_offset计算修复报告
## 问题描述
根据promptx/tauri-desktop-app-expert开发规范的要求检查了markdown解析逻辑中byte_offset的计算是否正确。发现了以下关键问题
### 1. 原始问题
**问题1错误的偏移量计算方式**
- 原代码在解析过程中手动累加`current_offset`,这种方式不准确
- 没有正确处理pulldown-cmark解析器的事件顺序和内容映射关系
- 对于UTF-8字符的字节长度计算不准确
**问题2缺乏UTF-8支持验证**
- 缺少针对UTF-8字符的byte_offset计算测试
- 没有验证字符偏移和字节偏移之间的转换正确性
## 修复方案
### 1. 使用pulldown-cmark的offset_iter
**修复前:**
```rust
let parser = CmarkParser::new(text);
let mut events = Vec::new();
let mut current_offset = 0;
for event in parser {
events.push((event.clone(), current_offset));
// 手动计算偏移量(不准确)
match &event {
Event::Text(text) => current_offset += text.len(),
// ...
}
}
```
**修复后:**
```rust
let parser = CmarkParser::new_with_broken_link_callback(
text,
pulldown_cmark::Options::all(),
None
);
let mut events = Vec::new();
// 使用pulldown-cmark提供的正确偏移量信息
for (event, range) in parser.into_offset_iter() {
events.push((event, range.start));
}
```
### 2. 正确的字节偏移计算
**修复前:**
```rust
// 使用不准确的字符串长度
end: self.calculate_position(source_text, current_offset + text.len())
```
**修复后:**
```rust
// 使用正确的字节长度
end: self.calculate_position_from_byte_offset(source_text, *byte_offset + text.as_bytes().len())
```
### 3. 增强的位置计算方法
添加了专门的方法来处理字节偏移和字符偏移之间的转换:
```rust
/// 根据字节偏移计算位置信息
fn calculate_position_from_byte_offset(&self, text: &str, byte_offset: usize) -> Position
/// 根据字符偏移计算位置信息
fn calculate_position_from_char_offset(&self, text: &str, char_offset: usize) -> Position
```
## 测试验证
### 1. ASCII字符测试
```rust
#[test]
fn test_byte_offset_calculation_ascii() {
let text = "Hello\nWorld";
// 验证各个位置的字节偏移计算正确性
}
```
### 2. UTF-8字符测试
```rust
#[test]
fn test_byte_offset_calculation_utf8() {
let text = "你好\n世界"; // UTF-8字符测试
// 验证中文字符的字节偏移计算正确性
}
```
### 3. 字符偏移转换测试
```rust
#[test]
fn test_char_offset_to_byte_offset_conversion() {
// 验证字符偏移和字节偏移之间的双向转换
}
```
### 4. 复杂markdown测试
```rust
#[test]
fn test_complex_markdown_byte_offsets() {
let markdown = "# 标题\n\n这是**粗体**和*斜体*文本。\n\n```rust\nfn main() {\n println!(\"你好\");\n}\n```";
// 验证复杂markdown结构的偏移量计算
}
```
## 修复结果
### 测试通过情况
- ✅ ASCII字符byte_offset计算正确
- ✅ UTF-8字符byte_offset计算正确
- ✅ 字符偏移与字节偏移转换正确
- ✅ 复杂markdown结构解析正确
- ✅ 位置一致性验证通过
- ✅ 所有原有测试继续通过
### 性能影响
- 使用pulldown-cmark的内置offset_iter性能更优
- 减少了手动计算的开销
- 提高了解析准确性
## 符合开发规范
根据promptx/tauri-desktop-app-expert规范要求
1. **类型安全**:✅ 使用Rust的类型系统确保偏移量计算的安全性
2. **性能优先**:✅ 使用高效的pulldown-cmark内置方法
3. **代码质量**:✅ 添加了全面的单元测试
4. **错误处理**:✅ 完善的边界检查和错误处理
5. **文档完整**:✅ 详细的代码注释和测试文档
## 总结
通过这次修复markdown解析器的byte_offset计算现在完全正确特别是对UTF-8字符的支持。修复遵循了Tauri开发规范确保了代码质量、性能和可维护性。所有测试都通过证明修复是成功的且没有破坏现有功能。

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@ -229,31 +229,17 @@ impl MarkdownParser {
return Err(anyhow!("Text too large: {} bytes", text.len()));
}
// 使用pulldown-cmark解析
let parser = CmarkParser::new(text);
// 使用pulldown-cmark解析带有偏移量信息
let parser = CmarkParser::new_with_broken_link_callback(
text,
pulldown_cmark::Options::all(),
None
);
let mut events = Vec::new();
let mut current_offset = 0;
// 收集所有事件和位置信息
for event in parser {
events.push((event.clone(), current_offset));
// 根据事件类型正确计算字节偏移
match &event {
Event::Text(text) => {
current_offset += text.len();
}
Event::Code(code) => {
current_offset += code.len();
}
Event::SoftBreak | Event::HardBreak => {
current_offset += 1; // 换行符通常是1字节
}
_ => {
// 对于其他事件类型,不增加偏移量
// 因为它们通常是结构性的,不对应实际的文本内容
}
}
// 收集所有事件pulldown-cmark会提供正确的偏移量信息
for (event, range) in parser.into_offset_iter() {
events.push((event, range.start));
}
// 构建AST
@ -285,18 +271,16 @@ impl MarkdownParser {
attributes: HashMap::new(),
};
let mut current_offset = 0;
for (event, _) in events {
for (event, byte_offset) in events {
match event {
Event::Start(tag) => {
let node = self.create_node_from_tag(tag, current_offset, source_text)?;
let node = self.create_node_from_tag(tag, *byte_offset, source_text)?;
stack.push(node);
}
Event::End(_) => {
if let Some(mut node) = stack.pop() {
// 更新结束位置
node.range.end = self.calculate_position(source_text, current_offset);
// 更新结束位置 - 使用当前字节偏移
node.range.end = self.calculate_position_from_byte_offset(source_text, *byte_offset);
if let Some(parent) = stack.last_mut() {
parent.children.push(node);
@ -310,8 +294,8 @@ impl MarkdownParser {
node_type: MarkdownNodeType::Text,
content: text.to_string(),
range: Range {
start: self.calculate_position(source_text, current_offset),
end: self.calculate_position(source_text, current_offset + text.len()),
start: self.calculate_position_from_byte_offset(source_text, *byte_offset),
end: self.calculate_position_from_byte_offset(source_text, *byte_offset + text.as_bytes().len()),
},
children: Vec::new(),
attributes: HashMap::new(),
@ -328,8 +312,8 @@ impl MarkdownParser {
node_type: MarkdownNodeType::InlineCode,
content: code.to_string(),
range: Range {
start: self.calculate_position(source_text, current_offset),
end: self.calculate_position(source_text, current_offset + code.len()),
start: self.calculate_position_from_byte_offset(source_text, *byte_offset),
end: self.calculate_position_from_byte_offset(source_text, *byte_offset + code.as_bytes().len()),
},
children: Vec::new(),
attributes: HashMap::new(),
@ -346,8 +330,8 @@ impl MarkdownParser {
node_type: MarkdownNodeType::LineBreak,
content: "\n".to_string(),
range: Range {
start: self.calculate_position(source_text, current_offset),
end: self.calculate_position(source_text, current_offset + 1),
start: self.calculate_position_from_byte_offset(source_text, *byte_offset),
end: self.calculate_position_from_byte_offset(source_text, *byte_offset + 1),
},
children: Vec::new(),
attributes: HashMap::new(),
@ -370,7 +354,7 @@ impl MarkdownParser {
/// 从pulldown-cmark标签创建节点
fn create_node_from_tag(&self, tag: &Tag, offset: usize, source_text: &str) -> Result<MarkdownNode> {
let start_pos = self.calculate_position(source_text, offset);
let start_pos = self.calculate_position_from_byte_offset(source_text, offset);
let (node_type, attributes) = match tag {
Tag::Heading(level, _, _) => {
@ -895,6 +879,188 @@ mod tests {
assert!(parse_result.statistics.total_nodes > 1000);
}
#[test]
fn test_byte_offset_calculation_ascii() {
let parser = create_test_parser();
let text = "Hello\nWorld";
// Test position at start
let pos = parser.calculate_position_from_byte_offset(text, 0);
assert_eq!(pos.line, 0);
assert_eq!(pos.column, 0);
assert_eq!(pos.offset, 0);
assert_eq!(pos.byte_offset, 0);
// Test position after "Hello"
let pos = parser.calculate_position_from_byte_offset(text, 5);
assert_eq!(pos.line, 0);
assert_eq!(pos.column, 5);
assert_eq!(pos.offset, 5);
assert_eq!(pos.byte_offset, 5);
// Test position after newline
let pos = parser.calculate_position_from_byte_offset(text, 6);
assert_eq!(pos.line, 1);
assert_eq!(pos.column, 0);
assert_eq!(pos.offset, 6);
assert_eq!(pos.byte_offset, 6);
// Test position at end
let pos = parser.calculate_position_from_byte_offset(text, text.len());
assert_eq!(pos.line, 1);
assert_eq!(pos.column, 5);
assert_eq!(pos.offset, 11);
assert_eq!(pos.byte_offset, 11);
}
#[test]
fn test_byte_offset_calculation_utf8() {
let parser = create_test_parser();
let text = "你好\n世界"; // UTF-8 characters: 你(3 bytes) 好(3 bytes) \n(1 byte) 世(3 bytes) 界(3 bytes)
// Test position at start
let pos = parser.calculate_position_from_byte_offset(text, 0);
assert_eq!(pos.line, 0);
assert_eq!(pos.column, 0);
assert_eq!(pos.offset, 0);
assert_eq!(pos.byte_offset, 0);
// Test position after first character "你" (3 bytes)
let pos = parser.calculate_position_from_byte_offset(text, 3);
assert_eq!(pos.line, 0);
assert_eq!(pos.column, 1);
assert_eq!(pos.offset, 1);
assert_eq!(pos.byte_offset, 3);
// Test position after "你好" (6 bytes)
let pos = parser.calculate_position_from_byte_offset(text, 6);
assert_eq!(pos.line, 0);
assert_eq!(pos.column, 2);
assert_eq!(pos.offset, 2);
assert_eq!(pos.byte_offset, 6);
// Test position after newline (7 bytes)
let pos = parser.calculate_position_from_byte_offset(text, 7);
assert_eq!(pos.line, 1);
assert_eq!(pos.column, 0);
assert_eq!(pos.offset, 3);
assert_eq!(pos.byte_offset, 7);
// Test position after "世" (10 bytes)
let pos = parser.calculate_position_from_byte_offset(text, 10);
assert_eq!(pos.line, 1);
assert_eq!(pos.column, 1);
assert_eq!(pos.offset, 4);
assert_eq!(pos.byte_offset, 10);
}
#[test]
fn test_char_offset_to_byte_offset_conversion() {
let parser = create_test_parser();
let text = "你好\n世界";
// Test char offset 0 -> byte offset 0
let pos = parser.calculate_position_from_char_offset(text, 0);
assert_eq!(pos.byte_offset, 0);
// Test char offset 1 -> byte offset 3 (after "你")
let pos = parser.calculate_position_from_char_offset(text, 1);
assert_eq!(pos.byte_offset, 3);
// Test char offset 2 -> byte offset 6 (after "你好")
let pos = parser.calculate_position_from_char_offset(text, 2);
assert_eq!(pos.byte_offset, 6);
// Test char offset 3 -> byte offset 7 (after newline)
let pos = parser.calculate_position_from_char_offset(text, 3);
assert_eq!(pos.byte_offset, 7);
// Test char offset 4 -> byte offset 10 (after "世")
let pos = parser.calculate_position_from_char_offset(text, 4);
assert_eq!(pos.byte_offset, 10);
// Test char offset 5 -> byte offset 13 (after "世界")
let pos = parser.calculate_position_from_char_offset(text, 5);
assert_eq!(pos.byte_offset, 13);
}
#[test]
fn test_markdown_parsing_with_utf8() {
let mut parser = create_test_parser();
let markdown = "# 中文标题\n\n这是一段**中文**内容。";
let result = parser.parse(markdown);
assert!(result.is_ok(), "Failed to parse UTF-8 markdown");
let parse_result = result.unwrap();
assert_eq!(parse_result.source_text, markdown);
// Verify that positions are calculated correctly
let root = &parse_result.root;
assert_eq!(root.range.start.byte_offset, 0);
assert_eq!(root.range.end.byte_offset, markdown.len());
// Check that child nodes have valid byte offsets
for child in &root.children {
assert!(child.range.start.byte_offset <= child.range.end.byte_offset);
assert!(child.range.end.byte_offset <= markdown.len());
}
}
#[test]
fn test_complex_markdown_byte_offsets() {
let mut parser = create_test_parser();
let markdown = "# 标题\n\n这是**粗体**和*斜体*文本。\n\n```rust\nfn main() {\n println!(\"你好\");\n}\n```\n\n- 列表项1\n- 列表项2";
let result = parser.parse(markdown);
assert!(result.is_ok(), "Failed to parse complex UTF-8 markdown");
let parse_result = result.unwrap();
// 验证所有节点的字节偏移量都在有效范围内
fn validate_node_offsets(node: &MarkdownNode, source_len: usize) {
assert!(node.range.start.byte_offset <= node.range.end.byte_offset,
"Start offset should be <= end offset for node: {:?}", node.node_type);
assert!(node.range.end.byte_offset <= source_len,
"End offset should be <= source length for node: {:?}", node.node_type);
// 验证行列号与字节偏移的一致性
assert!(node.range.start.line <= node.range.end.line,
"Start line should be <= end line for node: {:?}", node.node_type);
if node.range.start.line == node.range.end.line {
assert!(node.range.start.column <= node.range.end.column,
"Start column should be <= end column on same line for node: {:?}", node.node_type);
}
// 递归验证子节点
for child in &node.children {
validate_node_offsets(child, source_len);
}
}
validate_node_offsets(&parse_result.root, markdown.len());
}
#[test]
fn test_position_consistency() {
let parser = create_test_parser();
let text = "Hello 世界\nNew line";
// 测试字节偏移和字符偏移之间的一致性
for i in 0..text.chars().count() {
let pos_from_char = parser.calculate_position_from_char_offset(text, i);
let pos_from_byte = parser.calculate_position_from_byte_offset(text, pos_from_char.byte_offset);
assert_eq!(pos_from_char.line, pos_from_byte.line,
"Line mismatch at char offset {}", i);
assert_eq!(pos_from_char.column, pos_from_byte.column,
"Column mismatch at char offset {}", i);
assert_eq!(pos_from_char.offset, pos_from_byte.offset,
"Char offset mismatch at char offset {}", i);
}
}
#[test]
fn test_parser_config() {
let config = MarkdownParserConfig {

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@ -7,6 +7,8 @@ import {
MarkdownNodeType,
ValidationResult
} from '../types/markdown';
import ImageCard from './ImageCard';
import ImagePreviewModal from './ImagePreviewModal';
/**
* Markdown渲染器属性接口
@ -45,6 +47,9 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
const [isLoading, setIsLoading] = useState(false);
const [error, setError] = useState<string | null>(null);
const [validation, setValidation] = useState<ValidationResult | null>(null);
const [selectedGrounding, setSelectedGrounding] = useState<any>(null);
const [showGroundingModal, setShowGroundingModal] = useState(false);
const [previewSource, setPreviewSource] = useState<any>(null);
// 解析Markdown内容
const parseContent = useCallback(async () => {
@ -93,6 +98,28 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
}
}, [parseContent, enableRealTimeParsing]);
// 显示grounding详情
const showGroundingDetails = useCallback((groundingAnalysis: any) => {
setSelectedGrounding(groundingAnalysis);
setShowGroundingModal(true);
}, []);
// 关闭grounding详情
const closeGroundingDetails = useCallback(() => {
setShowGroundingModal(false);
setSelectedGrounding(null);
}, []);
// 查看大图
const handleViewLarge = useCallback((source: any) => {
setPreviewSource(source);
}, []);
// 关闭图片预览
const handleClosePreview = useCallback(() => {
setPreviewSource(null);
}, []);
// 分析节点与引用资源的关联
const analyzeNodeGrounding = useCallback((node: MarkdownNode) => {
if (!groundingMetadata?.grounding_supports || !parseResult) {
@ -102,31 +129,31 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
// 计算节点在原始文本中的字节偏移位置与grounding数据的字节偏移匹配
const nodeStartOffset = node.range?.start?.byte_offset || 0;
const nodeEndOffset = node.range?.end?.byte_offset || 0;
const nodeStartOffset1 = node.range?.start?.offset || 0;
const nodeEndOffset1 = node.range?.end?.offset || 0;
// 查找与当前节点位置重叠的grounding支持信息
const relatedSupports = groundingMetadata.grounding_supports.filter(support => {
// grounding数据使用字节偏移
const segmentStart = support.segment.startIndex;
const segmentEnd = support.segment.endIndex;
const hasOverlap = (nodeEndOffset <= segmentEnd && nodeStartOffset >= segmentStart);
const hasOverlap = (nodeStartOffset <= segmentEnd && nodeEndOffset >= segmentStart);
// 检查节点范围与grounding片段是否有重叠
return hasOverlap;
});
console.log({
relatedSupports,
nodeStartOffset,
nodeEndOffset,
nodeStartOffset1,
nodeEndOffset1
})
if (relatedSupports.length > 0) {
// 获取相关的来源信息
console.log('🔍 Related supports:', relatedSupports);
const relatedSources = relatedSupports.flatMap(support =>
support.groundingChunkIndices.map(index => groundingMetadata.sources[index])
).filter(Boolean);
console.log('📚 Related sources:', relatedSources);
console.log('🖼️ Source content examples:', relatedSources.map(s => ({
title: s.title,
uri: s.uri,
contentType: typeof s.content,
contentKeys: s.content ? Object.keys(s.content) : null,
contentSample: s.content
})));
const analysisResult = {
node: {
type: node.node_type,
@ -141,11 +168,39 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
groundingInfo: {
supportCount: relatedSupports.length,
sourceCount: relatedSources.length,
sources: relatedSources.map(source => ({
title: source.title,
uri: source.uri,
snippet: source.content?.snippet || 'No snippet available'
})),
sources: relatedSources.map(source => {
// 解析content字段中的图片信息
let imageData = null;
if (source.content) {
// 如果content是字符串尝试解析为JSON
if (typeof source.content === 'string') {
try {
imageData = JSON.parse(source.content);
} catch {
imageData = { description: source.content };
}
} else if (source.content.text) {
// 如果content有text字段使用text字段
try {
imageData = typeof source.content.text === 'string'
? JSON.parse(source.content.text)
: source.content.text;
} catch {
imageData = { description: source.content.text };
}
} else {
// 直接使用content对象
imageData = source.content;
}
}
return {
title: source.title,
uri: source.uri,
content: imageData,
snippet: imageData?.description || imageData?.snippet || 'No description available'
};
}),
segments: relatedSupports.map(support => ({
start: support.segment.startIndex,
end: support.segment.endIndex,
@ -172,10 +227,11 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
title={`引用了 ${groundingAnalysis.groundingInfo.sourceCount} 个来源`}
onClick={() => {
console.log('📚 点击查看引用详情:', groundingAnalysis);
// 这里可以添加弹窗或侧边栏显示详细引用信息
// 显示详细的引用信息,包括图片
showGroundingDetails(groundingAnalysis);
}}
>
📚 {groundingAnalysis.groundingInfo.sourceCount}
{groundingAnalysis.groundingInfo.sourceCount}
</span>
) : null;
@ -201,7 +257,6 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
return (
<HeadingTag key={key} className={headingClasses[level as keyof typeof headingClasses] || headingClasses[3]}>
{node.children.map((child, childIndex) => renderNode(child, depth + 1, childIndex))}
{GroundingIndicator}
</HeadingTag>
);
@ -209,7 +264,6 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
return (
<p key={key} className="mb-2">
{node.children.map((child, childIndex) => renderNode(child, depth + 1, childIndex))}
{GroundingIndicator}
</p>
);
@ -297,7 +351,7 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
);
case MarkdownNodeType.Text:
return <span key={key}>{node.content}</span>;
return <span key={key}>{node.content} {GroundingIndicator}</span>;
case MarkdownNodeType.LineBreak:
return <br key={key} />;
@ -381,8 +435,14 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
{groundingMetadata.sources.slice(0, 5).map((source, index) => (
<span
key={index}
className="inline-flex items-center px-2 py-1 text-xs bg-blue-50 text-blue-700 rounded-full"
className="inline-flex items-center px-2 py-1 text-xs bg-blue-50 text-blue-700 rounded-full cursor-pointer hover:bg-blue-100"
title={source.title || `来源 ${index + 1}`}
onClick={() => showGroundingDetails({
groundingInfo: {
sourceCount: 1,
sources: [source]
}
})}
>
{index + 1}
</span>
@ -395,6 +455,57 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
</div>
</div>
)}
{/* Grounding详情模态框 */}
{showGroundingModal && selectedGrounding && (
<div className="fixed inset-0 z-50 flex items-center justify-center bg-black bg-opacity-50">
<div className="bg-white rounded-lg shadow-xl max-w-4xl max-h-[90vh] overflow-hidden">
{/* 模态框头部 */}
<div className="flex items-center justify-between p-4 border-b border-gray-200">
<h3 className="text-lg font-semibold text-gray-900"></h3>
<button
onClick={closeGroundingDetails}
className="text-gray-400 hover:text-gray-600 transition-colors"
>
<svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
</svg>
</button>
</div>
{/* 模态框内容 */}
<div className="p-4 overflow-y-auto max-h-[calc(90vh-8rem)]">
<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
{selectedGrounding.groundingInfo?.sources?.map((source: any, index: number) => (
<div key={index} className="relative">
<ImageCard
source={source}
showDetails={true}
onViewLarge={handleViewLarge}
className="shadow-lg border border-gray-200 hover:shadow-xl transition-shadow"
/>
</div>
))}
</div>
{/* 如果没有图片,显示提示信息 */}
{(!selectedGrounding.groundingInfo?.sources || selectedGrounding.groundingInfo.sources.length === 0) && (
<div className="text-center py-8 text-gray-500">
<div className="text-4xl mb-2">🖼</div>
<p></p>
</div>
)}
</div>
</div>
</div>
)}
{/* 图片预览模态框 */}
<ImagePreviewModal
isOpen={!!previewSource}
source={previewSource}
onClose={handleClosePreview}
/>
</div>
);
};