[pytango] 364/483: Add str_2_obj

[Sandor Bodo-Merle]

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sbodomerle-guest pushed a commit to annotated tag bliss_8.10
in repository pytango.

commit e6a4de78a9a5191bcafac5f6b876146ac5e134a9
Author: tiagocoutinho <tiagocoutinho at 4e9c00fd-8f2e-0410-aa12-93ce3db5e235>
Date:   Tue Apr 1 08:21:24 2014 +0000

    Add str_2_obj
    
    git-svn-id: http://svn.code.sf.net/p/tango-cs/code/bindings/PyTango/trunk@25329 4e9c00fd-8f2e-0410-aa12-93ce3db5e235
---
 src/boost/python/utils.py | 37 +++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/src/boost/python/utils.py b/src/boost/python/utils.py
index ca72698..acac2a0 100644
--- a/src/boost/python/utils.py
+++ b/src/boost/python/utils.py
@@ -37,7 +37,7 @@ from ._PyTango import StdStringVector, StdDoubleVector, \
     DbData, DbDevInfos, DbDevExportInfos, CmdArgType, AttrDataFormat, \
     EventData, AttrConfEventData, DataReadyEventData, DevFailed, constants, \
     GreenMode
-
+from .constants import AlrmValueNotSpec, StatusNotSet
 
 _scalar_int_types = (CmdArgType.DevShort, CmdArgType.DevUShort,
     CmdArgType.DevInt, CmdArgType.DevLong, CmdArgType.DevULong,
@@ -88,8 +88,12 @@ _scalar_to_array_type = {
     CmdArgType.ConstDevString : CmdArgType.DevVarStringArray,
 }
 
+__NO_STR_VALUE = AlrmValueNotSpec, StatusNotSet
+
 __device_classes = None
 
+bool_ = lambda value_str : value_str.lower() == "true"
+
 
 def get_tango_device_classes():
     global __device_classes
@@ -564,7 +568,33 @@ def scalar_to_array_type(dtype):
     return _scalar_to_array_type[dtype]
 
 
-def obj_2_str(obj, tg_type):
+def str_2_obj(obj_str, tg_type=None):
+    """Converts a string into an object according to the given tango type
+    
+           :param obj_str: the string to be converted
+           :type obj_str: :py:obj:`str`
+           :param tg_type: tango type
+           :type tg_type: :class:`PyTango.CmdArgType`
+           :return: an object calculated from the given string
+           :rtype: :py:obj:`object`
+    """
+    if tg_type is None:
+        return obj_str
+    f = str
+    if is_scalar_type(tg_type):
+        if is_numerical_type(tg_type):
+            if obj_str in __NO_STR_VALUE:
+                return None
+        if is_int_type(tg_type):
+            f = int
+        elif is_float_type(tg_type):
+            f = float
+        elif is_bool_type(tg_type):
+            f = bool_
+    return f(obj_str)
+
+
+def obj_2_str(obj, tg_type=None):
     """Converts a python object into a string according to the given tango type
     
            :param obj: the object to be converted
@@ -574,6 +604,8 @@ def obj_2_str(obj, tg_type):
            :return: a string representation of the given object
            :rtype: :py:obj:`str`
     """
+    if tg_type is None:
+        return obj
     if tg_type in _scalar_types:
         # scalar cases
         if is_pure_str(obj):
@@ -586,6 +618,7 @@ def obj_2_str(obj, tg_type):
     # sequence cases
     return '\n'.join([str(i) for i in obj])
 
+
 def __get_meth_func(klass, method_name):
     meth = getattr(klass, method_name)
     func = meth

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