JetCore/jetc/JetAST.h

#ifndef __JetAST_h__
#define __JetAST_h__

#include <string>
#include <vector>
#include <memory>

namespace jetc {

   enum class NodeKind {
      TEXT, VAR, SET, IF, FOR, WHILE, FALLBACK, TAGDEF, CONTAINER_SLOT
   };

   enum class CondMode { VALUES, EXPR };

   struct Node;
   using NodePtr = std::shared_ptr<Node>;

   struct Cond {
      CondMode mode = CondMode::EXPR;
      std::string value1, value2, type;   // VALUES mode
      std::string expr;                   // EXPR mode
   };

   struct Node {
      NodeKind kind;

      // TEXT
      std::string text;

      // VAR - raw source slice, e.g. "$[@greeting]" or "#[foo]"
      std::string varText;

      // SET
      std::string setName;
      bool setHasValue = false;
      std::string setValue;
      bool setHasExpr = false;
      std::string setExpr;
      std::string setScope;   // "" = default/global

      // IF
      Cond cond;
      std::vector<NodePtr> thenBody;
      std::vector<NodePtr> elseBody;
      bool hasElse = false;

      // FOR
      bool forHasStart = false;
      std::string forStart;
      std::string forEnd;
      std::string forStep;
      bool forHasName = false;
      std::string forName;
      std::string forScope;
      std::vector<NodePtr> body;   // also used by WHILE

      // TAGDEF - a top-level <tag name="X">...</tag> custom-tag definition
      // (only recognized at the file's true top level - see Parser::topLevel;
      // one nested inside another tag's own definition body stays FALLBACK,
      // unchanged). tagDefName is already lowercased, matching __tag.cpp's
      // own registration key. tagDefBody is the compiled definition body
      // (may itself contain CONTAINER_SLOT nodes for <container> markers,
      // and FALLBACK leaves for anything still unsupported). rawSpan
      // (shared with FALLBACK, below) still holds the exact original source
      // text - codegen still emits the same raw interpretSpan-based
      // registration into global.tags alongside the new compiled fast path,
      // so anything that reaches this tag some other way keeps working
      // exactly as it does today.
      std::string tagDefName;
      std::vector<NodePtr> tagDefBody;

      // CONTAINER_SLOT - a <container> marker (see Tag::renderContainer) -
      // a pure leaf, no extra fields.

      // FALLBACK - exact original source text of one unsupported tag
      std::string rawSpan;
   };

}

#endif