28 lines
1.3 KiB
TypeScript
28 lines
1.3 KiB
TypeScript
import type { AdfNode } from '../../adf/document.ts'
|
|
import { carriesOnly, nodeAttrs, nodeContent } from '../../adf/document.ts'
|
|
import type { ConvertErrorPath } from '../../result.ts'
|
|
import { serializeCanonicalJson } from '../../canonical-json.ts'
|
|
import { tryImageLine } from './inline-line.ts'
|
|
|
|
const centeredMediaSingle = '{"layout":"center"}'
|
|
const imageAttributes = ['alt', 'type', 'url']
|
|
|
|
export function tryImage(node: AdfNode, path: ConvertErrorPath): string | undefined {
|
|
const image = imageShape(node)
|
|
if (image === undefined) return undefined
|
|
return tryImageLine(image.alt, image.url, [...path, 'content', 0])
|
|
}
|
|
|
|
function imageShape(node: AdfNode): { alt: string | undefined; url: string } | undefined {
|
|
const content = nodeContent(node)
|
|
const media = content[0]
|
|
if (!carriesOnly(node, ['layout']) || serializeCanonicalJson(nodeAttrs(node), 'compact') !== centeredMediaSingle) return undefined
|
|
if (media === undefined || content.length !== 1 || media.type !== 'media' || !carriesOnly(media, imageAttributes) || nodeContent(media).length > 0) return undefined
|
|
const attrs = nodeAttrs(media)
|
|
const alt = attrs['alt']
|
|
const url = attrs['url']
|
|
if (attrs['type'] !== 'external' || typeof url !== 'string') return undefined
|
|
if (alt !== undefined && (typeof alt !== 'string' || alt === '')) return undefined
|
|
return { alt, url }
|
|
}
|