84 lines
2.3 KiB
TypeScript
84 lines
2.3 KiB
TypeScript
/* 文件：markdown/footnote.ts — 支持 markdown 脚注的解析规则与渲染。 */
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import { Tokens, MarkedExtension } from "marked";
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import { Extension } from "./extension";
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const refRule = /^\[\^([^\]]+)\]/; // 匹配 [^label]
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const defRule = /^ *\[\^([^\]]+)\]:/; // 匹配 [^label]:
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export class FootnoteRenderer extends Extension {
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allDefs: any[] = [];
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defCounter = 0;
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async prepare() {
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this.allDefs = [];
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this.defCounter = 0;
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}
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async postprocess(html: string) {
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if (this.allDefs.length == 0) {
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return html;
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}
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let body = '';
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for (const def of this.allDefs) {
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const {label, content} = def;
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const html = await this.marked.parse(content);
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const id = `fn-${label}`;
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body += `<li id="${id}">${html}</li>`;
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}
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return html + `<section class="footnotes"><hr><ol>${body}</ol></section>`;
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}
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markedExtension(): MarkedExtension {
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return {
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extensions: [
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{
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name: 'FootnoteRef',
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level: 'inline',
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start(src) {
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const index = src.indexOf('[^');
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return index > 0 ? index : -1;
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},
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tokenizer: (src) => {
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const match = src.match(refRule);
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if (match) {
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return {
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type: 'FootnoteRef',
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raw: match[0],
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text: match[1],
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};
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}
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},
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renderer: (token: Tokens.Generic) => {
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this.defCounter += 1;
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const id = `fnref-${this.defCounter}`;
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return `<sup id="${id}">${this.defCounter}</sup>`;
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}
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},
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{
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name: 'FootnoteDef',
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level: 'block',
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tokenizer: (src) => {
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const match = src.match(defRule);
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if (match) {
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const label = match[1].trim();
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const end = src.indexOf('\n');
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const raw = end === -1 ? src: src.substring(0, end + 1);
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const content = raw.substring(match[0].length);
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this.allDefs.push({label, content});
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return {
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type: 'FootnoteDef',
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raw: raw,
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text: content,
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};
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}
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},
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renderer: (token: Tokens.Generic) => {
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return '';
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}
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}
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]
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}
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}
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} |