Refactor page content generators

CHDataManagement/Generator/Markdown/MarkdownCodeProcessor.swift

@@ -0,0 +1,32 @@
+import Ink
+
+struct MarkdownCodeProcessor: MarkdownProcessor {
+
+    static let modifier: Modifier.Target = .codeBlocks
+
+    private let results: PageGenerationResults
+
+    private let blocks: [ContentBlock : BlockProcessor]
+
+    private let other: OtherCodeProcessor
+
+    init(content: Content, results: PageGenerationResults, language: ContentLanguage) {
+        self.results = results
+        self.other = .init(results: results)
+
+        self.blocks = ContentBlock.allCases.reduce(into: [:]) { blocks, block in
+            blocks[block] = block.processor.init(content: content, results: results, language: language)
+        }
+    }
+
+    private let codeHighlightFooter = "<script>hljs.highlightAll();</script>"
+
+    func process(html: String, markdown: Substring) -> String {
+        let input = String(markdown)
+        let rawBlockId = input.dropAfterFirst("\n").dropBeforeFirst("```").trimmed
+        guard let blockId = ContentBlock(rawValue: rawBlockId) else {
+            return other.process(html: html)
+        }
+        return blocks[blockId]!.process(markdown)
+    }
+}