Check in all changes made so far toward 3.0.

1 files changed, 77 insertions, 0 deletions

diff --git a/py_eval.h b/py_eval.h
new file mode 100644
index 00000000..109f5fc4
--- /dev/null
+++ b/py_eval.h
@@ -0,0 +1,77 @@
+#ifndef _PY_EVAL_H
+#define _PY_EVAL_H
+
+#include "valexpr.h"
+#include "pyfstream.h"
+
+#include <string>
+#include <iostream>
+
+#include <boost/python.hpp>
+
+using namespace boost::python;
+
+namespace ledger {
+
+void shutdown_ledger_for_python();
+
+class python_interpreter_t : public valexpr_t::scope_t
+{
+  handle<> mmodule;
+  dict     nspace;
+
+ public:
+  python_interpreter_t(valexpr_t::scope_t * parent);
+
+  virtual ~python_interpreter_t() {
+    Py_Finalize();
+  }
+
+  object import(const std::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 std::string& str, py_eval_mode_t mode = PY_EVAL_EXPR);
+  object eval(const char * c_str,     py_eval_mode_t mode = PY_EVAL_EXPR) {
+    std::string str(c_str);
+    return eval(str, mode);
+  }
+
+  class functor_t : public valexpr_t::functor_t {
+   protected:
+    object func;
+   public:
+    python_functor_t(const std::string& name, object _func)
+      : valexpr_t::functor_t(name), func(_func) {}
+
+    virtual void operator()(value_t& result, valexpr_t::scope_t * locals);
+  };
+
+  virtual void define(const std::string& name, valexpr_t::node_t * def) {
+    // Pass any definitions up to our parent
+    parent->define(name, def);
+  }
+
+  virtual node_t * lookup(const std::string& name) {
+    object func = eval(name);
+    if (! func)
+      return parent ? parent->lookup(name) : NULL;
+    return valexpr_t::wrap_functor(new python_functor_t(name, func));
+  }
+
+  class lambda_t : public functor_t {
+   public:
+    python_lambda_t(object code) : python_functor_t("<lambda>"> code) {}
+
+    virtual void operator()(value_t& result, valexpr_t::scope_t * locals);
+  };
+;
+
+} // namespace ledger
+
+#endif // _PY_EVAL_H