# All files / src/lib/markdown-it/patches/custom-component htmlBlockRule.js

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     const blockNames = require('markdown-it/lib/common/html_blocks');
    const { HTML_OPEN_CLOSE_TAG_RE } = require('./htmlRe');
    const inlineTags = require('./inlineTags');

    function initCustomComponentHtmlBlockRule(tagsToIgnore) {
      // MODIFIED (MarkBind): Added 'special tags' and 'minimal panel' related rules

      /*
       * Set up special tags that we need to ignore for markdown parsing.
       * Custom patch for the api to escape content in certain special tags.
       *
       * script, pre, style are for Vue
       */
      const specialTagsRegex = Array.from(tagsToIgnore)
      .concat(['include|variable|site-nav|markdown|script|pre|style|textarea'])
      .join('|');

      // attr_name, unquoted ... attribute patterns adapted from markdown-it/lib/common/html_re
      // Construct self-closing negative lookahead for special tags,
      // because if matched, the endingSpecialTagRegex will roll down to find a non-existent closing tag
      const attr_name = '[a-zA-Z_:][a-zA-Z0-9:._-]*';
      const unquoted      = '[^"\'=<>`\\x00-\\x20]+';
      const single_quoted = "'[^']*'";
      const double_quoted = '"[^"]*"';
      const attr_value  = '(?:' + unquoted + '|' + single_quoted + '|' + double_quoted + ')';
      const attribute   = '(?:\\s+' + attr_name + '(?:\\s*=\\s*' + attr_value + ')?)';
      const selfClosingNegativeLookahead = `(?!${attribute}*\\s*\/>)`;

      const startingSpecialTagRegex = new RegExp(
      `^<(${specialTagsRegex})${selfClosingNegativeLookahead}(?=(\\s|>|$))`, 'i');
      const endingSpecialTagRegex = new RegExp(`<\\/(${specialTagsRegex})>`, 'i');

      /*
      * In MarkBind, we consider minimized panel components to be inline elements.
      * Thus, we have to ensure that markdown-it parses minimized panel as inline element
      * by using the regex below.
      */
      const minimizedPanelStringRegex = `(panel${attribute}* minimized)`;

      // Forked and modified from 'markdown-it/lib/rules_block/html_block.js'

      // An array of opening and corresponding closing sequences for html tags,
      // last argument defines whether it can terminate a paragraph or not
      const HTML_SEQUENCES = [
        // MODIFIED (MarkBind): ignore special tags
        [ startingSpecialTagRegex, endingSpecialTagRegex, true ],
        [/^<!--/, /-->/, true],
        [/^<\?/, /\?>/, true],
        [/^<![A-Z]/, />/, true],
        [/^<!\[CDATA\[/, /\]\]>/, true],
        // MODIFIED HERE: Treat unknown tags as block tags (custom components), excluding known inline tags
        [
          new RegExp(
            // MODIFIED (MarkBind): ignore panel tags with minimized attribute
            '^</?(?!(' + inlineTags.join('|') + `|${minimizedPanelStringRegex}` + ')(?![\\w-]))\\w[\\w-]*[\\s/>]'
          ),
          /^$/,
          true,
        ],
        [
          new RegExp('^</?(' + blockNames.join('|') + ')(?=(\\s|/?>|$))', 'i'),
          /^$/,
          true,
        ],
        [new RegExp(HTML_OPEN_CLOSE_TAG_RE.source + '\\s*$'), /^$/, false],
      ]

      function customComponentHtmlBlockRule(state, startLine, endLine, silent) {
        let i;
        let nextLine;
        let lineText;
        let pos = state.bMarks[startLine] + state.tShift[startLine];
        let max = state.eMarks[startLine];

        // if it's indented more than 3 spaces, it should be a code block
        if (state.sCount[startLine] - state.blkIndent >= 4) {
          return false
        }

        if (!state.md.options.html) {
          return false
        }

        if (state.src.charCodeAt(pos) !== 0x3c /* < */) {
          return false
        }

        lineText = state.src.slice(pos, max)

        for (i = 0; i < HTML_SEQUENCES.length; i++) {
          if (HTML_SEQUENCES[i][0].test(lineText)) {
            break
          }
        }

        if (i === HTML_SEQUENCES.length) {
          return false
        }

        if (silent) {
          // true if this sequence can be a terminator, false otherwise
          return HTML_SEQUENCES[i][2]
        }

        nextLine = startLine + 1

        // If we are here - we detected HTML block.
        // Let's roll down till block end.
        if (!HTML_SEQUENCES[i][1].test(lineText)) {
          for (; nextLine < endLine; nextLine++) {
            if (state.sCount[nextLine] < state.blkIndent) {
              break
            }

            pos = state.bMarks[nextLine] + state.tShift[nextLine]
            max = state.eMarks[nextLine]
            lineText = state.src.slice(pos, max)

            if (HTML_SEQUENCES[i][1].test(lineText)) {
              if (lineText.length !== 0) {
                nextLine++
              }
              break
            }
          }
        }

        state.line = nextLine

        const token = state.push('html_block', '', 0)
        token.map = [startLine, nextLine]
        token.content = state.getLines(startLine, nextLine, state.blkIndent, true)

        return true
      }

      return customComponentHtmlBlockRule;
    }

    module.exports = initCustomComponentHtmlBlockRule;