CodeMirror 对 XML 文档熟悉及元素控制自定义

CodeMirror 是一个网络代码编辑器组件。它可以在网站中用于实现支持多种编辑功能的文本输入字段，并具有丰富的编程接口以允许进一步扩展。

本文为 xml 格式的代码提示约束格式规范的自定义示例内容。

先看效果，如下：

在这里插入图片描述

官方 Demo 的完整代码如下（重点看代码中 tags 的配置）：

<!doctype html>

<title>CodeMirror: XML Autocomplete Demo</title>
<meta charset="utf-8"/>
<link rel=stylesheet href="../doc/docs.css">

<link rel="stylesheet" href="../lib/codemirror.css">
<link rel="stylesheet" href="../addon/hint/show-hint.css">
<script src="../lib/codemirror.js"></script>
<script src="../addon/hint/show-hint.js"></script>
<script src="../addon/hint/xml-hint.js"></script>
<script src="../mode/xml/xml.js"></script>
<style>
      .CodeMirror {
      
       border: 1px solid #eee; }
    </style>
<div id=nav>
  <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>

  <ul>
    <li><a href="../index.html">Home</a>
    <li><a href="../doc/manual.html">Manual</a>
    <li><a href="https://github.com/codemirror/codemirror5">Code</a>
  </ul>
  <ul>
    <li><a class=active href="#">XML Autocomplete</a>
  </ul>
</div>

<article>
<h2>XML Autocomplete Demo</h2>
<form><textarea id="code" name="code"><!-- write some xml below -->
</textarea></form>

    <p>Press <strong>ctrl-space</strong>, or type a '&lt;' character to
    activate autocompletion. This demo defines a simple schema that
    guides completion. The schema can be customized—see
    the <a href="../doc/manual.html#addon_xml-hint">manual</a>.</p>

    <p>Development of the <code>xml-hint</code> addon was kindly
    sponsored
    by <a href="http://www.xperiment.mobi">www.xperiment.mobi</a>.</p>

    <script>
      var dummy = {
      
      
        attrs: {
      
      
          color: ["red", "green", "blue", "purple", "white", "black", "yellow"],
          size: ["large", "medium", "small"],
          description: null
        },
        children: []
      };

      var tags = {
      
      
        "!top": ["top"],
        "!attrs": {
      
      
          id: null,
          class: ["A", "B", "C"]
        },
        top: {
      
      
          attrs: {
      
      
            lang: ["en", "de", "fr", "nl"],
            freeform: null
          },
          children: ["animal", "plant"]
        },
        animal: {
      
      
          attrs: {
      
      
            name: null,
            isduck: ["yes", "no"]
          },
          children: ["wings", "feet", "body", "head", "tail"]
        },
        plant: {
      
      
          attrs: {
      
      name: null},
          children: ["leaves", "stem", "flowers"]
        },
        wings: dummy, feet: dummy, body: dummy, head: dummy, tail: dummy,
        leaves: dummy, stem: dummy, flowers: dummy
      };

      function completeAfter(cm, pred) {
      
      
        var cur = cm.getCursor();
        if (!pred || pred()) setTimeout(function() {
      
      
          if (!cm.state.completionActive)
            cm.showHint({
      
      completeSingle: false});
        }, 100);
        return CodeMirror.Pass;
      }

      function completeIfAfterLt(cm) {
      
      
        return completeAfter(cm, function() {
      
      
          var cur = cm.getCursor();
          return cm.getRange(CodeMirror.Pos(cur.line, cur.ch - 1), cur) == "<";
        });
      }

      function completeIfInTag(cm) {
      
      
        return completeAfter(cm, function() {
      
      
          var tok = cm.getTokenAt(cm.getCursor());
          if (tok.type == "string" && (!/['"]/.test(tok.string.charAt(tok.string.length - 1)) || tok.string.length == 1)) return false;
          var inner = CodeMirror.innerMode(cm.getMode(), tok.state).state;
          return inner.tagName;
        });
      }

      var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
      
      
        mode: "xml",
        lineNumbers: true,
        extraKeys: {
      
      
          "'<'": completeAfter,
          "'/'": completeIfAfterLt,
          "' '": completeIfInTag,
          "'='": completeIfInTag,
          "Ctrl-Space": "autocomplete"
        },
        hintOptions: {
      
      schemaInfo: tags}
      });
    </script>
  </article>

在线地址：https://codemirror.net/5/demo/xmlcomplete.html

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CodeMirror 对 XML 文档熟悉及元素控制自定义

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