1 files changed, 42 insertions, 0 deletions
diff --git a/src/tag.hh b/src/tag.hh
new file mode 100644
index 0000000..ce7f149
--- /dev/null
+++ b/src/tag.hh
@@ -0,0 +1,42 @@
+#ifndef TAG_HH
+#define TAG_HH
+
+#include <memory>
+#include <string>
+#include <string_view>
+
+class Renderable {
+public:
+  virtual ~Renderable() = default;
+
+  virtual void render(std::string* out) const = 0;
+
+protected:
+  Renderable() = default;
+};
+
+class Tag : public virtual Renderable {
+public:
+  static std::unique_ptr<Tag> create(std::string name,
+                                     std::string content = std::string());
+
+  virtual std::string_view name() const = 0;
+  virtual bool empty() const = 0;
+  virtual bool has_attr(std::string const& name) const = 0;
+
+  virtual Tag* attr(std::string name, std::string value) = 0;
+  virtual Tag* add(std::string content) = 0;
+  // Does not clear attributes.
+  virtual Tag* clear_content() = 0;
+
+  // These return the new child tag, not this.
+  virtual Tag* add(std::unique_ptr<Tag> tag) = 0;
+  virtual Tag* add_tag(std::string name, std::string content = std::string());
+
+protected:
+  Tag() = default;
+  Tag(Tag const&) = delete;
+  Tag& operator=(Tag const&) = delete;
+};
+
+#endif  // TAG_HH