nixpy style values and printing

CHANGELOG.md

@@ -5,6 +5,26 @@ until the next release.
 
 # Latest changes in master
 
+...
+
+# Version 1.4.2
+
+## Print methods
+
+`pprint` methods have been added to both `Section` and `Property`
+to print whole Section trees with their child sections and properties.
+The `__repr__` style of `Section` and `Property` has been changed to
+be more similar to the [nixpy](https://github.com/G-Node/nixpy) `__repr__` style.
+Printing a `Section` now also features the immediate `Property` child count
+in addition to the immediate `Section` child count. See #309.
+
+## Deprecation of 'Property.value' in favor of 'Property.values'
+
+To make working with odML more similar to working with the 
+metadata part of [nixpy](https://github.com/G-Node/nixpy), the `Property.value` 
+attribute has been marked deprecated and the `Property.values` 
+attribute has been added. See #308. 
+
 ## Uncertainty changes
 
 Uncertainty is now limited to float only. See #294.

odml/base.py

@@ -357,8 +357,8 @@ def itervalues(self, max_depth=None, filter_func=lambda x: True):
         :type filter_func: function
         """
         for prop in [p for p in self.iterproperties(max_depth=max_depth)]:
-            if filter_func(prop.value):
-                yield prop.value
+            if filter_func(prop.values):
+                yield prop.values
 
     def contains(self, obj):
         """

odml/doc.py

@@ -42,8 +42,8 @@ def __init__(self, author=None, date=None, version=None, repository=None, oid=No
         self._origin_file_name = None
 
     def __repr__(self):
-        return "<Doc %s by %s (%d sections)>" % (self._version, self._author,
-                                                 len(self._sections))
+        return "Document %s {author = %s, %d sections}" % \
+               (self._version, self._author, len(self._sections))
 
     @property
     def oid(self):

odml/format.py

@@ -109,7 +109,8 @@ class Property(Format):
     _map = {
         'dependencyvalue': 'dependency_value',
         'type': 'dtype',
-        'id': 'oid'
+        'id': 'oid',
+        'value': 'values'
     }
     _rdf_map = {
         'id': _ns.hasId,

odml/property.py

@@ -13,10 +13,10 @@ class BaseProperty(base.BaseObject):
     """An odML Property"""
     _format = frmt.Property
 
-    def __init__(self, name=None, value=None, parent=None, unit=None,
+    def __init__(self, name=None, values=None, parent=None, unit=None,
                  uncertainty=None, reference=None, definition=None,
                  dependency=None, dependency_value=None, dtype=None,
-                 value_origin=None, oid=None):
+                 value_origin=None, oid=None, value=None):
         """
         Create a new Property. If a value without an explicitly stated dtype
         has been provided, the method will try to infer the value's dtype.
@@ -31,8 +31,8 @@ def __init__(self, name=None, value=None, parent=None, unit=None,
         >>> p.dtype
         >>> int
         :param name: The name of the property.
-        :param value: Some data value, it can be a single value or
-                      a list of homogeneous values.
+        :param values: Some data value, it can be a single value or
+                       a list of homogeneous values.
         :param unit: The unit of the stored data.
         :param uncertainty: The uncertainty (e.g. the standard deviation)
                             associated with a measure value.
@@ -48,6 +48,8 @@ def __init__(self, name=None, value=None, parent=None, unit=None,
         :param oid: object id, UUID string as specified in RFC 4122. If no id is provided,
                    an id will be generated and assigned. An id has to be unique
                    within an odML Document.
+        :param value: Legacy code to the 'values' attribute. If 'values' is provided,
+                      any data provided via 'value' will be ignored.
         """
         try:
             if oid is not None:
@@ -78,28 +80,33 @@ def __init__(self, name=None, value=None, parent=None, unit=None,
         else:
             print("Warning: Unknown dtype '%s'." % dtype)
 
-        self._value = []
-        self.value = value
+        self._values = []
+        self.values = values
+        if not values and (value or isinstance(value, bool)):
+            self.values = value
 
         self.parent = parent
 
     def __len__(self):
-        return len(self._value)
+        return len(self._values)
 
     def __getitem__(self, key):
-        return self._value[key]
+        return self._values[key]
 
     def __setitem__(self, key, item):
         if int(key) < 0 or int(key) > self.__len__():
             raise IndexError("odml.Property.__setitem__: key %i invalid for "
                              "array of length %i" % (int(key), self.__len__()))
         try:
             val = dtypes.get(item, self.dtype)
-            self._value[int(key)] = val
+            self._values[int(key)] = val
         except Exception:
             raise ValueError("odml.Property.__setitem__:  passed value cannot be "
                              "converted to data type \'%s\'!" % self._dtype)
 
+    def __repr__(self):
+        return "Property: {name = %s}" % self._name
+
     @property
     def oid(self):
         """
@@ -143,9 +150,6 @@ def name(self, new_name):
 
         self._name = new_name
 
-    def __repr__(self):
-        return "<Property %s>" % self._name
-
     @property
     def dtype(self):
         """
@@ -166,10 +170,10 @@ def dtype(self, new_type):
             raise AttributeError("'%s' is not a valid type." % new_type)
         # we convert the value if possible
         old_type = self._dtype
-        old_values = self._value
+        old_values = self._values
         try:
             self._dtype = new_type
-            self.value = old_values
+            self.values = old_values
         except:
             self._dtype = old_type  # If conversion failed, restore old dtype
             raise ValueError("cannot convert from '%s' to '%s'" %
@@ -209,42 +213,27 @@ def _validate_parent(new_parent):
     @property
     def value(self):
         """
-        Returns the value(s) stored in this property. Method always returns a list
-        that is a copy (!) of the stored value. Changing this list will NOT change
-        the property.
-        For manipulation of the stored values use the append, extend, and direct
-        access methods (using brackets).
-
-        For example:
-        >>> p = odml.Property("prop", value=[1, 2, 3])
-        >>> print(p.value)
-        [1, 2, 3]
-        >>> p.value.append(4)
-        >>> print(p.value)
-        [1, 2, 3]
+        Deprecated alias of 'values'. Will be removed with the next minor release.
+        """
+        print("The attribute 'value' is deprecated. Please use 'values' instead.")
+        return self.values
 
-        Individual values can be accessed and manipulated like this:
-        >>> print(p[0])
-        [1]
-        >>> p[0] = 4
-        >>> print(p[0])
-        [4]
+    @value.setter
+    def value(self, new_value):
+        """
+        Deprecated alias of 'values'. Will be removed with the next minor release.
 
-        The values can be iterated e.g. with a loop:
-        >>> for v in p.value:
-        >>>   print(v)
-        4
-        2
-        3
+        :param new_value: a single value or list of values.
         """
-        return list(self._value)
+        print("The attribute 'value' is deprecated. Please use 'values' instead.")
+        self.values = new_value
 
     def value_str(self, index=0):
         """
         Used to access typed data of the value at a specific
         index position as a string.
         """
-        return dtypes.set(self._value[index], self._dtype)
+        return dtypes.set(self._values[index], self._dtype)
 
     def _validate_values(self, values):
         """
@@ -285,19 +274,52 @@ def _convert_value_input(self, new_value):
                              "unsupported data type for values: %s" % type(new_value))
         return new_value
 
-    @value.setter
-    def value(self, new_value):
+    @property
+    def values(self):
         """
-        Set the value of the property discarding any previous information.
+        Returns the value(s) stored in this property. Method always returns a list
+        that is a copy (!) of the stored value. Changing this list will NOT change
+        the property.
+        For manipulation of the stored values use the append, extend, and direct
+        access methods (using brackets).
+
+        For example:
+        >>> p = odml.Property("prop", values=[1, 2, 3])
+        >>> print(p.values)
+        [1, 2, 3]
+        >>> p.values.append(4)
+        >>> print(p.values)
+        [1, 2, 3]
+
+        Individual values can be accessed and manipulated like this:
+        >>> print(p[0])
+        [1]
+        >>> p[0] = 4
+        >>> print(p[0])
+        [4]
+
+        The values can be iterated e.g. with a loop:
+        >>> for v in p.values:
+        >>>   print(v)
+        4
+        2
+        3
+        """
+        return list(self._values)
+
+    @values.setter
+    def values(self, new_value):
+        """
+        Set the values of the property discarding any previous information.
         Method will try to convert the passed value to the dtype of
-        the property and raise an ValueError if not possible.
+        the property and raise a ValueError if not possible.
 
         :param new_value: a single value or list of values.
         """
         # Make sure boolean value 'False' gets through as well...
         if new_value is None or \
                 (isinstance(new_value, (list, tuple, str)) and len(new_value) == 0):
-            self._value = []
+            self._values = []
             return
 
         new_value = self._convert_value_input(new_value)
@@ -306,9 +328,9 @@ def value(self, new_value):
             self._dtype = dtypes.infer_dtype(new_value[0])
 
         if not self._validate_values(new_value):
-            raise ValueError("odml.Property.value: passed values are not of "
+            raise ValueError("odml.Property.values: passed values are not of "
                              "consistent type!")
-        self._value = [dtypes.get(v, self.dtype) for v in new_value]
+        self._values = [dtypes.get(v, self.dtype) for v in new_value]
 
     @property
     def value_origin(self):
@@ -394,8 +416,8 @@ def remove(self, value):
         occurrence of the passed in value is removed from the properties
         list of values.
         """
-        if value in self._value:
-            self._value.remove(value)
+        if value in self._values:
+            self._values.remove(value)
 
     def get_path(self):
         """
@@ -417,7 +439,7 @@ def clone(self, keep_id=False):
         """
         obj = super(BaseProperty, self).clone()
         obj._parent = None
-        obj.value = self._value
+        obj.values = self._values
         if not keep_id:
             obj.new_id()
 
@@ -441,7 +463,7 @@ def merge_check(self, source, strict=True):
 
         # Catch unmerge-able values at this point to avoid
         # failing Section tree merges which cannot easily be rolled back.
-        new_value = self._convert_value_input(source.value)
+        new_value = self._convert_value_input(source.values)
         if not self._validate_values(new_value):
             raise ValueError("odml.Property.merge: passed value(s) cannot "
                              "be converted to data type '%s'!" % self._dtype)
@@ -512,7 +534,7 @@ def merge(self, other, strict=True):
         if self.unit is None and other.unit is not None:
             self.unit = other.unit
 
-        to_add = [v for v in other.value if v not in self._value]
+        to_add = [v for v in other.values if v not in self._values]
         self.extend(to_add, strict=strict)
 
     def unmerge(self, other):
@@ -557,11 +579,11 @@ def extend(self, obj, strict=True):
             if obj.unit != self.unit:
                 raise ValueError("odml.Property.extend: src and dest units (%s, %s) "
                                  "do not match!" % (obj.unit, self.unit))
-            self.extend(obj.value)
+            self.extend(obj.values)
             return
 
         if self.__len__() == 0:
-            self.value = obj
+            self.values = obj
             return
 
         new_value = self._convert_value_input(obj)
@@ -572,7 +594,7 @@ def extend(self, obj, strict=True):
         if not self._validate_values(new_value):
             raise ValueError("odml.Property.extend: passed value(s) cannot be converted "
                              "to data type \'%s\'!" % self._dtype)
-        self._value.extend([dtypes.get(v, self.dtype) for v in new_value])
+        self._values.extend([dtypes.get(v, self.dtype) for v in new_value])
 
     def append(self, obj, strict=True):
         """
@@ -587,8 +609,8 @@ def append(self, obj, strict=True):
         if obj in [None, "", [], {}]:
             return
 
-        if not self.value:
-            self.value = obj
+        if not self.values:
+            self.values = obj
             return
 
         new_value = self._convert_value_input(obj)
@@ -603,4 +625,36 @@ def append(self, obj, strict=True):
             raise ValueError("odml.Property.append: passed value(s) cannot be converted "
                              "to data type \'%s\'!" % self._dtype)
 
-        self._value.append(dtypes.get(new_value[0], self.dtype))
+        self._values.append(dtypes.get(new_value[0], self.dtype))
+
+    def pprint(self, indent=2, max_length=80, current_depth=-1):
+        """
+        Pretty print method to visualize Properties and Section-Property trees.
+
+        :param indent: number of leading spaces for every child Property.
+        :param max_length: maximum number of characters printed in one line.
+        :param current_depth: number of hierarchical levels printed from the
+                              starting Section.
+        """
+        property_spaces = ""
+        prefix = ""
+        if current_depth >= 0:
+            property_spaces = " " * ((current_depth + 2) * indent)
+            prefix = "|-"
+
+        if self.unit is None:
+            value_string = str(self.values)
+        else:
+            value_string = "{}{}".format(self.values, self.unit)
+
+        p_len = len(property_spaces) + len(self.name) + len(value_string)
+        if p_len >= max_length - 4:
+            split_len = int((max_length - len(property_spaces)
+                             + len(self.name) - len(prefix))/2)
+            str1 = value_string[0: split_len]
+            str2 = value_string[-split_len:]
+            print(("{}{} {}: {} ... {}".format(property_spaces, prefix,
+                                               self.name, str1, str2)))
+        else:
+            print(("{}{} {}: {}".format(property_spaces, prefix, self.name,
+                                        value_string)))