kuyua9
96 lines
2.4 KiB
JavaScript
96 lines
2.4 KiB
JavaScript
export const READING_BOOKMARK_VERSION = 1
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export const READING_BOOKMARK_KEY_PREFIX = 'ev-reading-bookmark:'
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export const getReadingBookmarkKey = (path) =>
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`${READING_BOOKMARK_KEY_PREFIX}${path || '/'}`
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const clampNumber = (value, min, max, fallback = min) => {
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const numeric = Number(value)
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if (!Number.isFinite(numeric)) return fallback
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return Math.min(max, Math.max(min, numeric))
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}
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export const createReadingBookmark = ({
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path,
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title = '',
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section = '',
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scrollY = 0,
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progress = 0,
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now = () => Date.now()
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}) => ({
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version: READING_BOOKMARK_VERSION,
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path: path || '/',
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title: String(title || '').trim(),
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section: String(section || '').trim(),
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scrollY: Math.max(0, Math.round(Number(scrollY) || 0)),
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progress: Math.round(clampNumber(progress, 0, 100, 0)),
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updatedAt: now()
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})
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export const createReadingBookmarkSnapshot = ({
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path,
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getTitle = () => '',
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getSection = () => '',
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getScrollY = () => 0,
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getProgress = () => 0,
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now = () => Date.now()
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}) =>
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createReadingBookmark({
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path,
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title: getTitle(),
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section: getSection(),
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scrollY: getScrollY(),
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progress: getProgress(),
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now
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})
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const normalizeBookmark = (
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value,
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expectedPath,
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maxScrollY = Number.MAX_SAFE_INTEGER
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) => {
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if (!value || typeof value !== 'object') return null
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if (value.version !== READING_BOOKMARK_VERSION) return null
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if (value.path !== expectedPath) return null
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return {
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version: READING_BOOKMARK_VERSION,
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path: value.path,
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title: String(value.title || '').trim(),
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section: String(value.section || '').trim(),
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scrollY: Math.round(
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clampNumber(value.scrollY, 0, Math.max(0, maxScrollY), 0)
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),
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progress: Math.round(clampNumber(value.progress, 0, 100, 0)),
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updatedAt: Number(value.updatedAt) || 0
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}
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}
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export const readReadingBookmark = (storage, path, maxScrollY) => {
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if (!storage) return null
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try {
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const expectedPath = path || '/'
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const raw = storage.getItem(getReadingBookmarkKey(expectedPath))
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if (!raw) return null
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return normalizeBookmark(JSON.parse(raw), expectedPath, maxScrollY)
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} catch {
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return null
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}
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}
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export const writeReadingBookmark = (storage, bookmark) => {
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if (!storage || !bookmark?.path) return false
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try {
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storage.setItem(
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getReadingBookmarkKey(bookmark.path),
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JSON.stringify(bookmark)
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)
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return true
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} catch {
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return false
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}
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}
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