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✏️ Editing: closetag.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

/**
 * Tag-closer extension for CodeMirror.
 *
 * This extension adds an "autoCloseTags" option that can be set to
 * either true to get the default behavior, or an object to further
 * configure its behavior.
 *
 * These are supported options:
 *
 * `whenClosing` (default true)
 *   Whether to autoclose when the '/' of a closing tag is typed.
 * `whenOpening` (default true)
 *   Whether to autoclose the tag when the final '>' of an opening
 *   tag is typed.
 * `dontCloseTags` (default is empty tags for HTML, none for XML)
 *   An array of tag names that should not be autoclosed.
 * `indentTags` (default is block tags for HTML, none for XML)
 *   An array of tag names that should, when opened, cause a
 *   blank line to be added inside the tag, and the blank line and
 *   closing line to be indented.
 * `emptyTags` (default is none)
 *   An array of XML tag names that should be autoclosed with '/>'.
 *
 * See demos/closetag.html for a usage example.
 */

var htmlDontClose = ["area", "base", "br", "col", "command", "embed", "hr", "img", "input", "keygen", "link", "meta", "param",
                       "source", "track", "wbr"];
  var htmlIndent = ["applet", "blockquote", "body", "button", "div", "dl", "fieldset", "form", "frameset", "h1", "h2", "h3", "h4",
                    "h5", "h6", "head", "html", "iframe", "layer", "legend", "object", "ol", "p", "select", "table", "ul"];

function autoCloseGT(cm) {
    if (cm.getOption("disableInput")) return CodeMirror.Pass;
    var ranges = cm.listSelections(), replacements = [];
    var opt = cm.getOption("autoCloseTags");
    for (var i = 0; i < ranges.length; i++) {
      if (!ranges[i].empty()) return CodeMirror.Pass;
      var pos = ranges[i].head, tok = cm.getTokenAt(pos);
      var inner = CodeMirror.innerMode(cm.getMode(), tok.state), state = inner.state;
      var tagInfo = inner.mode.xmlCurrentTag && inner.mode.xmlCurrentTag(state)
      var tagName = tagInfo && tagInfo.name
      if (!tagName) return CodeMirror.Pass

var html = inner.mode.configuration == "html";
      var dontCloseTags = (typeof opt == "object" && opt.dontCloseTags) || (html && htmlDontClose);
      var indentTags = (typeof opt == "object" && opt.indentTags) || (html && htmlIndent);

if (tok.end > pos.ch) tagName = tagName.slice(0, tagName.length - tok.end + pos.ch);
      var lowerTagName = tagName.toLowerCase();
      // Don't process the '>' at the end of an end-tag or self-closing tag
      if (!tagName ||
          tok.type == "string" && (tok.end != pos.ch || !/[\"\']/.test(tok.string.charAt(tok.string.length - 1)) || tok.string.length == 1) ||
          tok.type == "tag" && tagInfo.close ||
          tok.string.indexOf("/") == (pos.ch - tok.start - 1) || // match something like <someTagName />
          dontCloseTags && indexOf(dontCloseTags, lowerTagName) > -1 ||
          closingTagExists(cm, inner.mode.xmlCurrentContext && inner.mode.xmlCurrentContext(state) || [], tagName, pos, true))
        return CodeMirror.Pass;

var emptyTags = typeof opt == "object" && opt.emptyTags;
      if (emptyTags && indexOf(emptyTags, tagName) > -1) {
        replacements[i] = { text: "/>", newPos: CodeMirror.Pos(pos.line, pos.ch + 2) };
        continue;
      }

var indent = indentTags && indexOf(indentTags, lowerTagName) > -1;
      replacements[i] = {indent: indent,
                         text: ">" + (indent ? "\n\n" : "") + "</" + tagName + ">",
                         newPos: indent ? CodeMirror.Pos(pos.line + 1, 0) : CodeMirror.Pos(pos.line, pos.ch + 1)};
    }

function autoCloseSlash(cm) {
    if (cm.getOption("disableInput")) return CodeMirror.Pass;
    return autoCloseCurrent(cm, true);
  }

CodeMirror.commands.closeTag = function(cm) { return autoCloseCurrent(cm); };

function indexOf(collection, elt) {
    if (collection.indexOf) return collection.indexOf(elt);
    for (var i = 0, e = collection.length; i < e; ++i)
      if (collection[i] == elt) return i;
    return -1;
  }

// If xml-fold is loaded, we use its functionality to try and verify
  // whether a given tag is actually unclosed.
  function closingTagExists(cm, context, tagName, pos, newTag) {
    if (!CodeMirror.scanForClosingTag) return false;
    var end = Math.min(cm.lastLine() + 1, pos.line + 500);
    var nextClose = CodeMirror.scanForClosingTag(cm, pos, null, end);
    if (!nextClose || nextClose.tag != tagName) return false;
    // If the immediate wrapping context contains onCx instances of
    // the same tag, a closing tag only exists if there are at least
    // that many closing tags of that type following.
    var onCx = newTag ? 1 : 0
    for (var i = context.length - 1; i >= 0; i--) {
      if (context[i] == tagName) ++onCx
      else break
    }
    pos = nextClose.to;
    for (var i = 1; i < onCx; i++) {
      var next = CodeMirror.scanForClosingTag(cm, pos, null, end);
      if (!next || next.tag != tagName) return false;
      pos = next.to;
    }
    return true;
  }
});

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