{{- $content := .Content -}}

{{- if $content -}}

  {{- $content = dict "Content" .Content "Ruby" .Ruby "Fraction" .Fraction "Fontawesome" .Fontawesome | partial "function/content.html" }}

  {{- /* Keep only the first <pre class="mermaid">...</pre> inside a diagram-container */ -}}
  {{- $content = $content | replaceRE `(?s)<div[^>]*class="diagram-container"[^>]*>.*?(<pre[^>]*class="mermaid"[^>]*>.*?</pre>).*?</div>\s*(?:<template[^>]*>.*?</template>\s*)?` "$1" }}
  {{- $mermaidMatches := findRE `(?s)<pre[^>]*class="mermaid"[^>]*>.*?</pre>` $content -}}
  {{- if gt (len $mermaidMatches) 0 -}}
    {{- range $i, $m := $mermaidMatches -}}
      {{- $attrs := $m | replaceRE `(?s)<pre([^>]*)>.*?</pre>` "$1" -}}
      {{- $inner := $m | replaceRE `(?s)<pre[^>]*>(.*?)</pre>` "$1" -}}
      {{- $inner = replace $inner " " "&ensp;" -}}
      {{- $newPre := printf "<pre%s>%s</pre>" $attrs $inner -}}
      {{- $content = replace $content $m $newPre -}}
    {{- end -}}
  {{- end -}}

  {{- /* Remove echarts diagram containers entirely */ -}}
  {{- $content = $content | replaceRE `(?s)<div[^>]*class="diagram-container"[^>]*>.*?<div[^>]*class="echarts"[^>]*>.*?</div>\s*(?:<template[^>]*>.*?</template>\s*)?.*?</div>` "" -}}

  {{- /* Replace json-viewer components with JSON code blocks */ -}}
  {{- $matches := findRE `(?s)<json-viewer\b[^>]*\bvalue="[^"]*"[^>]*>(?:</json-viewer>)?` $content -}}
  {{- if gt (len $matches) 0 -}}
    {{- range $i, $m := $matches -}}
      {{- /* extract the value="...": use replaceRE on the full match to get the captured group */ -}}
      {{- $rawVal := $m | replaceRE `(?s).*value="([^"]*)".*` "$1" -}}
      {{- /* decode HTML entities, strip outer quotes if present, unescape JSON-style escapes */ -}}
      {{- $jsonStr := $rawVal | htmlUnescape | replaceRE `^"(.*)"$` "$1" | replaceRE `\\\\` `\` | replaceRE `\\\"` `"` | replaceRE `\\n` "\n" | replaceRE `\\r` "" | replaceRE `\\t` "\t" -}}
      {{- /* try to unmarshal into object */ -}}
      {{- $obj := transform.Unmarshal $jsonStr | default dict -}}
      {{- /* serialize back to JSON */ -}}
      {{- $pretty := $obj | jsonify (dict "indent" "&ensp;&ensp;") -}}
      {{- /* build replacement pre/code block */ -}}
      {{- $replacement := printf "<pre><code>%s</code></pre>" $pretty -}}
      {{- /* replace the full original match with the rendered block */ -}}
      {{- $content = replace $content $m $replacement -}}
    {{- end -}}
  {{- end -}}

  {{- with .FeaturedImage }}
    {{- $content = add (printf "<img src=%q alt=%q referrerpolicy=%q>" . "featured image" "no-referrer") $content }}
  {{- end }}

  {{- $content = $content | transform.XMLEscape | safeHTML -}}

{{- end }}

{{- return $content -}}