openflow build environment setup

openflow/include/click/variableenv.hh

@@ -0,0 +1,50 @@
+// -*- c-basic-offset: 4; related-file-name: "../../lib/variableenv.cc" -*-
+#ifndef CLICK_VARIABLEENVIRONMENT_HH
+#define CLICK_VARIABLEENVIRONMENT_HH
+#include <click/string.hh>
+#include <click/vector.hh>
+CLICK_DECLS
+class StringAccum;
+
+class VariableExpander { public:
+
+    VariableExpander()			{ }
+    virtual ~VariableExpander()		{ }
+
+    virtual int expand(const String &var, String &expansion, int vartype, int depth) const = 0;
+
+};
+
+class VariableEnvironment : public VariableExpander { public:
+
+    VariableEnvironment(VariableEnvironment *parent);
+
+    int depth() const			{ return _depth; }
+    int size() const			{ return _names.size(); }
+
+    bool defines(const String &name) const;
+    const String &name(int i) const	{ return _names[i]; }
+    const Vector<String> &values() const { return _values; }
+    const String &value(int i) const	{ return _values[i]; }
+    const String &value(const String &name, bool &found) const;
+
+    void clear()			{ _names.clear(); _values.clear(); }
+
+    VariableEnvironment *parent_of(int depth) const;
+    bool define(const String &name, const String &value, bool override);
+    int expand(const String &var, String &expansion, int vartype, int depth) const;
+
+  private:
+
+    Vector<String> _names;
+    Vector<String> _values;
+    int _depth;
+    VariableEnvironment *_parent;
+
+};
+
+String cp_expand(const String &str, const VariableExpander &env,
+		 bool expand_quote = false, int depth = 0);
+
+CLICK_ENDDECLS
+#endif