fix: set language on CodeNode for markdown fenced code blocks
#1302
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`CodeBlockParser::parse()` stored the fenced code info string in
`options['caption']` via `withOptions()`, but nothing ever read that
value — `CodeNode::getCaption()` returns the typed `$caption` property,
not `getOption('caption')`. As a result, `CodeNode::getLanguage()`
always returned `null` for markdown code blocks, producing
`class="language-"` in the rendered HTML and preventing syntax
highlighting.
Replace the dead `withOptions(['caption' => ...])` call with
`setLanguage()` using `getInfoWords()[0]` from the CommonMark
`FencedCode` node, matching both the RST parser's behavior
(`CodeBlockDirective`) and league/commonmark's own `FencedCodeRenderer`.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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CodeBlockParser::parse()stored the fenced code info string inoptions['caption']viawithOptions(), but nothing ever read that value —CodeNode::getCaption()returns the typed$captionproperty, notgetOption('caption'). As a result,CodeNode::getLanguage()always returnednullfor markdown code blocks, producingclass="language-"in the rendered HTML and preventing syntax highlighting.Replace the dead
withOptions(['caption' => ...])call withsetLanguage()usinggetInfoWords()[0]from the CommonMarkFencedCodenode, matching both the RST parser's behavior (CodeBlockDirective) and league/commonmark's ownFencedCodeRenderer.