Package org.codehaus.groovy.tools.groovydoc

# Class PreLanguageRewriter

java.lang.Object
org.codehaus.groovy.tools.groovydoc.PreLanguageRewriter

public final class PreLanguageRewriter extends Object
Post-process pass that retrofits syntax-highlighting classes onto bare `<pre>` blocks in generated HTML. Used by both the Ant Groovydoc task and the `groovydoc` CLI so their outputs stay identical.

Bare `<pre>...</pre>` blocks — openings with no attributes at all — are rewritten to `<pre class="language-xxx"><code>...</code></pre>` so Prism's highlighter picks them up (Prism only walks `<code>` descendants of language-classed elements). A `<pre>` whose body already contains a `<code>` element (e.g. the canonical form emitted by `{@snippet}`) only receives the class on its opening tag, to avoid nested `<code><code>`. Any `<pre>` with an existing attribute — `class`, `id`, or other — is left untouched.

Since:
  6.0.0

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static void`
  `rewriteDirectory(File dir, String preLanguage)`
  Walks `dir` recursively and applies `rewriteTags(java.lang.String, java.lang.String)` to every `.html` file in place.
  `static String`
  `rewriteTags(String html, String preLanguage)`
  Returns `html` with `<pre>` blocks rewritten so Prism can highlight them.

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Method Details

  - ### rewriteTags

    public static String rewriteTags(String html, String preLanguage)
    Returns `html` with `<pre>` blocks rewritten so Prism can highlight them. Three cases:
    - Bare `<pre>body</pre>` with no attributes becomes `<pre class="language-xxx"><code>body</code></pre>`.
    - `<pre class="...language-...">body</pre>` that lacks an inner `<code>` gets its body wrapped in `<code>` (Prism walks `<code>` descendants, so a language-classed `<pre>` without a `<code>` child is skipped by the highlighter).
    - All other cases — `<pre>` with an existing `<code>` descendant, or with a class that doesn't mention `language-*` — are left untouched.
    No-op when `preLanguage` is `null` or empty.

  - ### rewriteDirectory

    public static void rewriteDirectory(File dir, String preLanguage)
    Walks `dir` recursively and applies `rewriteTags(java.lang.String, java.lang.String)` to every `.html` file in place. A no-op when `preLanguage` is `null` or empty.