1 files changed, 83 insertions, 0 deletions
diff --git a/src/pyinterp.h b/src/pyinterp.h
new file mode 100644
index 00000000..a75ef78b
--- /dev/null
+++ b/src/pyinterp.h
@@ -0,0 +1,83 @@
+#ifndef _PY_EVAL_H
+#define _PY_EVAL_H
+
+#include "xpath.h"
+
+#if defined(USE_BOOST_PYTHON)
+
+#include <boost/python.hpp>
+#include <boost/python/detail/api_placeholder.hpp>
+#include <boost/python/exception_translator.hpp>
+#include <boost/python/suite/indexing/map_indexing_suite.hpp>
+
+#include <Python.h>
+
+#include "pyfstream.h"
+
+using namespace boost::python;
+
+namespace ledger {
+
+class python_interpreter_t : public xml::xpath_t::scope_t
+{
+  handle<> mmodule;
+
+ public:
+  dict     nspace;
+
+  python_interpreter_t(xml::xpath_t::scope_t * parent);
+
+  virtual ~python_interpreter_t() {
+    Py_Finalize();
+  }
+
+  object import(const string& name);
+
+  enum py_eval_mode_t {
+    PY_EVAL_EXPR,
+    PY_EVAL_STMT,
+    PY_EVAL_MULTI
+  };
+
+  object eval(std::istream& in,       py_eval_mode_t mode = PY_EVAL_EXPR);
+  object eval(const string& str, py_eval_mode_t mode = PY_EVAL_EXPR);
+  object eval(const char * c_str,     py_eval_mode_t mode = PY_EVAL_EXPR) {
+    string str(c_str);
+    return eval(str, mode);
+  }
+
+  class functor_t : public xml::xpath_t::functor_t {
+   protected:
+    object func;
+   public:
+    functor_t(const string& name, object _func)
+      : xml::xpath_t::functor_t(name), func(_func) {}
+
+    virtual void operator()(value_t& result, xml::xpath_t::scope_t * locals);
+  };
+
+  virtual void define(const string& name, xml::xpath_t::op_t * def) {
+    // Pass any definitions up to our parent
+    parent->define(name, def);
+  }
+
+  virtual xml::xpath_t::op_t * lookup(const string& name) {
+    object func = eval(name);
+    if (! func)
+      return parent ? parent->lookup(name) : NULL;
+    return xml::xpath_t::wrap_functor(new functor_t(name, func));
+  }
+
+  class lambda_t : public functor_t {
+   public:
+    lambda_t(object code) : functor_t("<lambda>", code) {}
+
+    virtual void operator()(value_t& result, xml::xpath_t::scope_t * locals);
+  };
+};
+
+} // namespace ledger
+
+#endif // USE_BOOST_PYTHON
+
+#endif // _PY_EVAL_H