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diff --git a/helm/DEVEL/mathml_editor/src/TCharStreamString.hh b/helm/DEVEL/mathml_editor/src/TCharStreamString.hh
new file mode 100644
index 000000000..36306272b
--- /dev/null
+++ b/helm/DEVEL/mathml_editor/src/TCharStreamString.hh
@@ -0,0 +1,22 @@
+
+#ifndef __TCharStreamString_hh__
+#define __TCharStreamString_hh__
+
+#include "TCharStream.hh"
+
+class TCharStreamString : public TCharStream
+{
+public:
+  TCharStreamString(const TString& s) : buffer(s), idx(0) { };
+  virtual ~TCharStreamString() { };
+
+  virtual bool  more(void) const { return idx < buffer.length(); };
+  virtual TChar look(void) const { if (more()) return buffer[idx]; else throw EmptyStream(); };
+  virtual TChar next(void) { if (more()) return buffer[idx++]; else throw EmptyStream(); };
+
+private:
+  unsigned long idx; 
+  TString buffer;
+};
+
+#endif // __TCharStreamString_hh__