1 files changed, 41 insertions, 0 deletions
diff --git a/value.h b/value.h
new file mode 100644
index 0000000..0236b42
--- /dev/null
+++ b/value.h
@@ -0,0 +1,41 @@
+#ifndef VALUE_H_
+#define VALUE_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "string_piece.h"
+
+using namespace std;
+
+class Evaluator;
+
+class Evaluable {
+ public:
+  virtual void Eval(Evaluator* ev, string* s) const = 0;
+  virtual shared_ptr<string> Eval(Evaluator*) const;
+
+ protected:
+  Evaluable();
+  virtual ~Evaluable();
+};
+
+class Value : public Evaluable {
+ public:
+  virtual ~Value();
+
+  virtual Value* Compact() { return this; }
+
+  string DebugString() const;
+
+ protected:
+  Value();
+  virtual string DebugString_() const = 0;
+};
+
+Value* ParseExpr(StringPiece s, bool is_command);
+
+string JoinValues(const vector<Value*> vals, const char* sep);
+
+#endif  // VALUE_H_