ADD file via upload

highlighter.h

@@ -0,0 +1,29 @@
+#pragma once
+#include <string>
+#include <vector>
+
+class Highlighter {
+public:
+    struct HighlightSpan {
+        size_t start;
+        size_t length;
+    };
+    
+    static std::string highlight_text(
+        const std::string& text,
+        const std::vector<std::string>& keywords,
+        const std::string& pre_tag = "<em>",
+        const std::string& post_tag = "</em>"
+    );
+    
+    static std::vector<HighlightSpan> find_keyword_positions(
+        const std::string& text,
+        const std::vector<std::string>& keywords
+    );
+    
+    static std::string extract_snippet(
+        const std::string& text,
+        const std::vector<HighlightSpan>& spans,
+        size_t context_size = 50
+    );
+};