在 Markdown-it 中渲染令牌？答案

【问题标题】：Render tokens in Markdown-it?在 Markdown-it 中渲染令牌？
【发布时间】：2020-09-21 09:36:01
【问题描述】：

我想有条件地忽略一些标记，所以我写道：

var md = require("markdown-it")();
var mk = require("@iktakahiro/markdown-it-katex");
var mkit = require("markdown-it");
md.use(mk);

import Renderer from "markdown-it/lib/renderer";
let renderer = new Renderer()

markdown = `
# Title
## Ignored section
I am ignored...
## Other section
...
`
tokens = md.parse(markdown)
tokens = process_tokens(tokens)

console.log(renderer.render(token)) // <-----

我得到了错误：

Error TypeError: Cannot read property 'breaks' of undefined

在renderer.js:108

default_rules.softbreak = function (tokens, idx, options /*, env */) {
  return options.breaks ? (options.xhtmlOut ? '<br />\n' : '<br>\n') : '\n'; // <----
};

是否可以分两步渲染markdown？

markdown -1-> tokens -2-> html

在这个例子中，我将有以下标记：

0: Token {type: "heading_open", tag: "h1", attrs: null, map: Array(2), nesting: 1, …}
1: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
2: Token {type: "heading_close", tag: "h1", attrs: null, map: null, nesting: -1, …}
3: Token {type: "heading_open", tag: "h2", attrs: null, map: Array(2), nesting: 1, …}
4: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
5: Token {type: "heading_close", tag: "h2", attrs: null, map: null, nesting: -1, …}
6: Token {type: "paragraph_open", tag: "p", attrs: null, map: Array(2), nesting: 1, …}
7: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
8: Token {type: "paragraph_close", tag: "p", attrs: null, map: null, nesting: -1, …}
9: Token {type: "heading_open", tag: "h2", attrs: null, map: Array(2), nesting: 1, …}
10: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
11: Token {type: "heading_close", tag: "h2", attrs: null, map: null, nesting: -1, …}
12: Token {type: "paragraph_open", tag: "p", attrs: null, map: Array(2), nesting: 1, …}
13: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
14: Token {type: "paragraph_close", tag: "p", attrs: null, map: null, nesting: -1, …}

在检测到我要删除的h2 后，我得到了这个：

0: Token {type: "heading_open", tag: "h1", attrs: null, map: Array(2), nesting: 1, …}
1: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
2: Token {type: "heading_close", tag: "h1", attrs: null, map: null, nesting: -1, …}
3: Token {type: "heading_open", tag: "h2", attrs: null, map: Array(2), nesting: 1, …}
4: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
5: Token {type: "heading_close", tag: "h2", attrs: null, map: null, nesting: -1, …}
6: Token {type: "paragraph_open", tag: "p", attrs: null, map: Array(2), nesting: 1, …}
7: Token {type: "inline", tag: "", attrs: null, map: Array(2), nesting: 0, …}
8: Token {type: "paragraph_close", tag: "p", attrs: null, map: null, nesting: -1, …}

【问题讨论】：

标签： javascript markdown markdown-it

【解决方案1】：

您不需要实例化另一个渲染器。您的问题是 render 需要来自 md 的选项：

tokens = md.parse(markdown)
md.renderer.render(tokens, md.options)

【讨论】：