4

我正在使用 node.js 从代码中生成静态html 文件，并使用 prismjs 对其进行格式化。在我的应用程序中，我无法访问支持 Javascript 的 HTML 渲染器（我使用的是“htmllite”）。所以我需要能够生成不需要 Javascript 的 HTML。

const Prism = require('prismjs');
const loadLanguages = require('prismjs/components/');
loadLanguages(['csharp']);
const code = '<a bunch of C# code>';
const html = Prism.highlight(code, Prism.languages.csharp, 'csharp');

这很好用。但我想使用该line-numbers插件，但不知道如何使它工作。我<pre>的line-numbers班级，我的左边距更大，但没有行号。

4

3 回答 3

7

PrismJS需要 DOM 才能使大多数插件工作。查看plugins/line-numbers/prism-line-numbers.js#L109中的代码后，我们可以看到行号只是一个span元素，其中每一行都class="line-numbers-rows"包含一个空元素span。我们可以在没有 DOM 的情况下模拟这种行为，只需使用用于获取行号的相同正则表达式，prism-line-numbers然后编写一个包含 html 代码的字符串，span.line-numbers-rows并为每行添加一个空字符串<span></span>。

Prism.highlight只运行 2 个钩子，before-tokenize并且after-tokenize. 我们将after-tokenize用来组成一个lineNumbersWrapper包含span.line-numbers-rows元素和空span行元素的字符串：

const Prism = require('prismjs');
const loadLanguages = require('prismjs/components/');
loadLanguages(['csharp']);

const code = `Console.WriteLine();
Console.WriteLine("Demo: Prism line-numbers plugin with nodejs");`;

// https://github.com/PrismJS/prism/blob/master/plugins/line-numbers/prism-line-numbers.js#L109
var NEW_LINE_EXP = /\n(?!$)/g;
var lineNumbersWrapper;

Prism.hooks.add('after-tokenize', function (env) {
  var match = env.code.match(NEW_LINE_EXP);
  var linesNum = match ? match.length + 1 : 1;
  var lines = new Array(linesNum + 1).join('<span></span>');

  lineNumbersWrapper = `<span aria-hidden="true" class="line-numbers-rows">${lines}</span>`;
});

const formated = Prism.highlight(code, Prism.languages.csharp, 'csharp');
const html = formated + lineNumbersWrapper;

console.log(html);

这将输出：

Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span><span class="token string">"Demo: Generate invalid numbers"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span>

最后有span.line-numbers-rows：

<span aria-hidden="true" class="line-numbers-rows">
  <span></span>
  <span></span>
</span>

现在，如果我们在元素中使用该输出pre.language-csharp.line-numbers code.language-csharp，我们将得到正确的行号结果。检查此Codepenthemes/prism.css，它仅plugins/line-numbers/prism-line-numbers.css使用上述输出代码正确显示行号。

请注意，每一行（第一行除外）都必须是用于代码正确显示的标记，这是因为我们在一个pre.code块内，但我想你已经知道了。

更新

如果您不依赖 CSS，并且只希望在每行之前有一个行号，那么您可以通过拆分所有行来添加一个，并index + 1在开始时使用空格填充添加每行padStart：

const Prism = require('prismjs');
const loadLanguages = require('prismjs/components/');
loadLanguages(['csharp']);

const code = `Console.WriteLine();
Console.WriteLine("Demo: Prism line-numbers plugin with nodejs");`;

const formated = Prism.highlight(code, Prism.languages.csharp, 'csharp');

const html = formated
  .split('\n')
  .map((line, num) => `${(num + 1).toString().padStart(4, ' ')}. ${line}`)
  .join('\n');

console.log(html);

将输出：

   1. Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   2. Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span><span class="token string">"Demo: Prism line-numbers plugin with nodejs"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
于 2020-01-03T10:55:31.243 回答
1

我有一个带有代码片段的 React 网站，我使用了这样的 prismjs 节点模块：

源码.js

import * as Prism from "prismjs";
export default function SourceCode(props) {
    return (
        <div>
            <div style={{ maxWidth: 900 }}>
                <pre className="language-javascript" style={{ backgroundColor: "#272822", fontSize: "0.8em" }}>
                    <code
                        style={{ fontFamily: "Consolas,Monaco,'Andale Mono','Ubuntu Mono',monospace" }}
                        dangerouslySetInnerHTML={{
                            __html: Prism.highlight(props.code, Prism.languages.javascript, "javascript"),
                        }}
                    />
                </pre>
            </div>
        </div>
    );
};

然后我决定添加行号插件，我很难弄清楚如何让它与 Node.js 和 React 一起工作。问题是行号使用了 DOM，而在 Node.js 中并没有简单地使用 DOM。

我最终做了什么。我卸载了 prismjs 模块并以旧方式进行了:)。

索引.html

<html lang="en-us">
    <head>
        <meta charset="utf-8" />
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
        <title>SciChart Web Demo</title>
        <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap" />
        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.21.0/themes/prism-okaidia.min.css" />
        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.21.0/plugins/line-numbers/prism-line-numbers.min.css" />
        <script async type="text/javascript" src="bundle.js"></script>
    </head>
    <body>
        <div id="react-root"></div>
        <script>
            window.Prism = window.Prism || {};
            Prism.manual = true;
        </script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.21.0/prism.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.21.0/plugins/line-numbers/prism-line-numbers.min.js"></script>
    </body>
</html>

源码.js

import * as React from "react";

export default function SourceCode(props) {
    React.useEffect(() => {
        window.Prism.highlightAll();
    }, []);
    return (
        <div>
            <div style={{ maxWidth: 900 }}>
                <pre
                    className="language-javascript line-numbers"
                    style={{ backgroundColor: "#272822", fontSize: "0.8em" }}
                >
                    <code style={{ fontFamily: "Consolas,Monaco,'Andale Mono','Ubuntu Mono',monospace" }}>
                        {props.code}
                    </code>
                </pre>
            </div>
        </div>
    );
};
于 2020-09-27T14:20:43.313 回答
0

也许这可以帮助你：

Codepen 出现错误：

关联

（codepen 行超出了 stack-overflow 的限制！）

在此处输入图像描述

Codepen 工作正常：

关联

（codepen 行超出了 stack-overflow 的限制！）

在此处输入图像描述

两者之间的变化：

pre.line-numbers {
	position: relative;
	padding-left: 3.8em;
	counter-reset: linenumber;
}

pre.line-numbers>code {
	position: relative;
}

.line-numbers .line-numbers-rows {
	position: absolute;
	pointer-events: none;
	top: 0;
	font-size: 100%;
	left: -3.8em;
	width: 3em;
	/* works for line-numbers below 1000 lines */
	letter-spacing: -1px;
	border-right: 1px solid #999;
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
}

.line-numbers-rows>span {
	pointer-events: none;
	display: block;
	counter-increment: linenumber;
}

.line-numbers-rows>span:before {
	content: counter(linenumber);
	color: #999;
	display: block;
	padding-right: 0.8em;
	text-align: right;
}

于 2020-01-03T01:09:13.713 回答