From 5bb376b3f9d0d103f7d7d5568a4985ea99df2e5c Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Tue, 10 Nov 2009 20:52:36 -0500
Subject: Added implicit Python conversion of time_duration_t

---
 src/py_times.cc | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 86 insertions(+), 12 deletions(-)

(limited to 'src/py_times.cc')

diff --git a/src/py_times.cc b/src/py_times.cc
index e140a23c..a62bb9b6 100644
--- a/src/py_times.cc
+++ b/src/py_times.cc
@@ -33,6 +33,7 @@
 
 #include "pyinterp.h"
 #include "pyutils.h"
+#include "times.h"
 
 // jww (2007-05-04): Convert time duration objects to PyDelta
 
@@ -40,8 +41,6 @@ namespace ledger {
 
 using namespace boost::python;
 
-typedef boost::gregorian::date date;
-
 #define MY_PyDateTime_IMPORT				\
   PyDateTimeAPI = (PyDateTime_CAPI*)			\
   PyCObject_Import(const_cast<char *>("datetime"),	\
@@ -49,7 +48,7 @@ typedef boost::gregorian::date date;
 
 struct date_to_python
 {
-  static PyObject* convert(const date& dte)
+  static PyObject* convert(const date_t& dte)
   {
     MY_PyDateTime_IMPORT;
     return PyDate_FromDate(dte.year(), dte.month(), dte.day());
@@ -77,13 +76,13 @@ struct date_from_python
     date::day_type d =
       static_cast<date::day_type>(PyDateTime_GET_DAY(obj_ptr));
 
-    date * dte = new date(y, m, d);
+    date_t * dte = new date_t(y, m, d);
 
     data->convertible = (void *) dte;
   }
 };
 
-typedef register_python_conversion<date, date_to_python, date_from_python>
+typedef register_python_conversion<date_t, date_to_python, date_from_python>
   date_python_conversion;
 
 
@@ -93,7 +92,7 @@ struct datetime_to_python
   {
     MY_PyDateTime_IMPORT;
 
-    date dte = moment.date();
+    date_t dte = moment.date();
     datetime_t::time_duration_type tod = moment.time_of_day();
 
     return PyDateTime_FromDateAndTime
@@ -127,28 +126,102 @@ struct datetime_from_python
 
     datetime_t::time_duration_type::hour_type h =
       static_cast<datetime_t::time_duration_type::hour_type>
-        (PyDateTime_DATE_GET_HOUR(obj_ptr));
+      (PyDateTime_DATE_GET_HOUR(obj_ptr));
     datetime_t::time_duration_type::min_type min =
       static_cast<datetime_t::time_duration_type::min_type>
-        (PyDateTime_DATE_GET_MINUTE(obj_ptr));
+      (PyDateTime_DATE_GET_MINUTE(obj_ptr));
     datetime_t::time_duration_type::sec_type s =
       static_cast<datetime_t::time_duration_type::sec_type>
-        (PyDateTime_DATE_GET_SECOND(obj_ptr));
+      (PyDateTime_DATE_GET_SECOND(obj_ptr));
     datetime_t::time_duration_type::fractional_seconds_type ms =
       static_cast<datetime_t::time_duration_type::fractional_seconds_type>
-        (PyDateTime_DATE_GET_MICROSECOND(obj_ptr)) * 1000000;
+      (PyDateTime_DATE_GET_MICROSECOND(obj_ptr)) * 1000000;
 
     datetime_t * moment
-      = new datetime_t(date(y, m, d),
+      = new datetime_t(date_t(y, m, d),
 		       datetime_t::time_duration_type(h, min, s, ms));
 
     data->convertible = (void *) moment;
   }
 };
 
-typedef register_python_conversion<datetime_t, datetime_to_python, datetime_from_python>
+typedef register_python_conversion<datetime_t,
+				   datetime_to_python, datetime_from_python>
   datetime_python_conversion;
 
+
+/* Convert time_duration to/from python */
+struct duration_to_python
+{
+  static int get_usecs(boost::posix_time::time_duration const& d)
+  {
+    static int64_t resolution =
+      boost::posix_time::time_duration::ticks_per_second();
+    int64_t fracsecs = d.fractional_seconds();
+    if (resolution > 1000000)
+      return static_cast<int>(fracsecs / (resolution / 1000000));
+    else
+      return static_cast<int>(fracsecs * (1000000 / resolution));
+  }
+
+  static PyObject * convert(posix_time::time_duration d)
+  {
+    int days = d.hours() / 24;
+    if (days < 0)
+      days --;
+    int seconds = d.total_seconds() - days*(24*3600);
+    int usecs = get_usecs(d);
+    if (days < 0)
+      usecs = 1000000-1 - usecs;
+    return PyDelta_FromDSU(days, seconds, usecs);
+  }
+};
+
+/* Should support the negative values, but not the special boost time
+   durations */
+struct duration_from_python
+{
+  static void* convertible(PyObject * obj_ptr)
+  {
+    if ( ! PyDelta_Check(obj_ptr))
+      return 0;
+    return obj_ptr;
+  }
+
+  static void construct(PyObject* obj_ptr,
+			python::converter::rvalue_from_python_stage1_data * data)
+  {
+    PyDateTime_Delta const* pydelta
+      = reinterpret_cast<PyDateTime_Delta*>(obj_ptr);
+
+    int days = pydelta->days;
+    bool is_negative = (days < 0);
+    if (is_negative)
+      days = -days;
+
+    // Create time duration object
+    posix_time::time_duration
+      duration = (posix_time::hours(24) * days +
+		  posix_time::seconds(pydelta->seconds) +
+		  posix_time::microseconds(pydelta->microseconds));
+    if (is_negative)
+      duration = duration.invert_sign();
+
+    void * storage =
+      reinterpret_cast<converter::rvalue_from_python_storage
+                       <posix_time::time_duration> *>
+                      (data)->storage.bytes;
+
+    new (storage) posix_time::time_duration(duration);
+    data->convertible = storage;
+  }
+};
+
+typedef register_python_conversion<time_duration_t,
+				   duration_to_python, duration_from_python>
+  duration_python_conversion;
+
+
 datetime_t py_parse_datetime(const string& str) {
   return parse_datetime(str);
 }
@@ -161,6 +234,7 @@ void export_times()
 {
   datetime_python_conversion();
   date_python_conversion();
+  duration_python_conversion();
 
   register_optional_to_python<datetime_t>();
   register_optional_to_python<date_t>();
-- 
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