Jon Staab
99 lines
2.7 KiB
Markdown
99 lines
2.7 KiB
Markdown
# Content Parser
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The content parser system in `@welshman/content` provides utilities for parsing Nostr content into structured elements.
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## Core Types
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### ParsedType Enum
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Defines all supported content types:
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- `Address` - naddr references to parameterized replaceable events
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- `Cashu` - Cashu token strings
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- `Code` - Code blocks and inline code
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- `Ellipsis` - Truncation indicators
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- `Emoji` - Custom emoji references
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- `Event` - Event references (note/nevent)
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- `Invoice` - Lightning invoices
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- `Link` - HTTP/HTTPS URLs
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- `LinkGrid` - Collections of adjacent links
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- `Newline` - Line breaks
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- `Profile` - Profile references (npub/nprofile)
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- `Text` - Plain text content
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- `Topic` - Hashtags
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## Main Functions
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### parse(options)
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Main parsing function that processes content into structured elements:
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```typescript
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parse({content?: string, tags?: string[][]}) => Parsed[]
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```
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Takes content string and optional tags array, returns array of parsed elements. Uses tags for emoji lookup and imeta information.
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### truncate(content, options)
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Truncates parsed content to specified length limits:
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```typescript
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truncate(content: Parsed[], {
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minLength?: number, // 500 - minimum before truncating
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maxLength?: number, // 700 - maximum total length
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mediaLength?: number, // 200 - assumed size for media
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entityLength?: number // 30 - assumed size for entities
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}) => Parsed[]
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```
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### reduceLinks(content)
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Combines adjacent links into `LinkGrid` elements for better presentation:
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```typescript
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reduceLinks(content: Parsed[]) => Parsed[]
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```
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## Type Guards
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Utility functions to check parsed element types:
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- `isAddress(parsed)`, `isCashu(parsed)`, `isCode(parsed)`, etc.
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- `isImage(parsed)` - special check for image links
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## Utilities
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- `urlIsMedia(url)` - Checks if URL points to media file
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- `fromNostrURI(s)` - Removes nostr: protocol prefix
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## Example Usage
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```typescript
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import { parse, truncate, reduceLinks } from '@welshman/content'
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const content = `Check out this cool #nostr client!
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https://github.com/coracle-social/welshman
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https://welshman.coracle.social
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Visit npub1jlrs53pkdfjnts29kveljul2sm0actt6n8dxrrzqcersttvcuv3qdjynqn for more info`
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// Parse the content into structured elements
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const parsed = parse({ content })
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// Combine adjacent links into grids
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const withLinkGrids = reduceLinks(parsed)
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// Truncate to reasonable length for preview
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const truncated = truncate(withLinkGrids, {
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minLength: 100,
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maxLength: 200
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})
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// Result contains structured elements:
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// - Text: "Check out this cool "
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// - Topic: "nostr"
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// - Text: " client!\n"
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// - LinkGrid: [github.com/..., welshman.coracle.social]
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// - Text: "Visit "
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// - Profile: npub1jlrs53pkdfjnts29kveljul2sm0actt6n8dxrrzqcersttvcuv3qdjynqn
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// - Text: " for more info"
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```
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