78 lines
2.3 KiB
TypeScript
78 lines
2.3 KiB
TypeScript
import { diffLines, diffWords } from 'diff';
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import DOMPurify from 'dompurify';
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import { POST_CONTENT_PURIFY_CONFIG } from './postContent';
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export interface PostSnapshot {
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title: string;
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content: string;
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tags: string;
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}
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export interface RevisionChangeSummary {
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titleChanged: boolean;
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tagsChanged: boolean;
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contentChanged: boolean;
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hasChanges: boolean;
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}
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export interface DiffPart {
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value: string;
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added?: boolean;
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removed?: boolean;
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}
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/** 将 HTML 正文转为适合 diff 的纯文本（保留段落换行） */
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export function htmlToDiffText(html: string): string {
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if (!html.trim()) return '';
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const doc = new DOMParser().parseFromString(
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DOMPurify.sanitize(html, POST_CONTENT_PURIFY_CONFIG),
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'text/html',
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);
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doc.querySelectorAll('br').forEach(br => br.replaceWith('\n'));
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const blocks = doc.querySelectorAll('p, div, li, h1, h2, h3, h4, h5, h6, blockquote, pre, members-only, reply-only');
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blocks.forEach(el => {
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el.prepend(doc.createTextNode('\n'));
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el.append(doc.createTextNode('\n'));
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});
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return (doc.body.textContent ?? '')
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.replace(/\r\n/g, '\n')
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.replace(/\n{3,}/g, '\n\n')
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.trim();
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}
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export function summarizeChange(before: PostSnapshot, after: PostSnapshot): RevisionChangeSummary {
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const titleChanged = before.title.trim() !== after.title.trim();
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const tagsChanged = normalizeTags(before.tags) !== normalizeTags(after.tags);
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const contentChanged = htmlToDiffText(before.content) !== htmlToDiffText(after.content);
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return {
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titleChanged,
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tagsChanged,
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contentChanged,
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hasChanges: titleChanged || tagsChanged || contentChanged,
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};
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}
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function normalizeTags(tags: string) {
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return tags.split(/[,，]/).map(t => t.trim()).filter(Boolean).join(',');
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}
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export function diffTextLines(before: string, after: string): DiffPart[] {
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return diffLines(before || '', after || '');
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}
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export function diffTextWords(before: string, after: string): DiffPart[] {
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return diffWords(before || '', after || '');
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}
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/** 统计 diff 片段中的增删行数 */
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export function countLineChanges(parts: DiffPart[]) {
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let added = 0;
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let removed = 0;
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for (const p of parts) {
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const lines = p.value.split('\n').filter(l => l.length > 0);
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if (p.added) added += lines.length;
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else if (p.removed) removed += lines.length;
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}
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return { added, removed };
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}
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