"""
HoloViews can be used to build highly-nested data-structures
containing large amounts of raw data. As a result, it is difficult to
generate a readable representation that is both informative yet
concise.
As a result, HoloViews does not attempt to build representations that
can be evaluated with eval; such representations would typically be
far too large to be practical. Instead, all HoloViews objects can be
represented as tree structures, showing how to access and index into
your data.
In addition, there are several different ways of
"""
import sys, re
import param
# IPython not required to import ParamPager
from param.ipython import ParamPager
from holoviews.core.util import group_sanitizer, label_sanitizer
class ParamFilter(param.ParameterizedFunction):
"""
Given a parameterized object, return a proxy parameterized object
holding only the parameters that match some filter criterion.
A filter is supplied with the parameter name and the parameter
object and must return a boolean. A regular expression filter has
been supplied and may be used to search for parameters mentioning
'bounds' as follows:
filtered = ParamFilter(obj, ParamFilter.regexp_filter('bounds'))
This may be used to filter documentation generated by param.
"""
def __call__(self, obj, filter_fn=None):
if filter_fn is None:
return obj
name = obj.__name__ if isinstance(obj,type) else obj.__class__.__name__
class_proxy = type(name, (param.Parameterized,),
{k:v for k,v in obj.params().items() if filter_fn(k,v)})
if isinstance(obj,type):
return class_proxy
else:
instance_params = obj.get_param_values()
obj_proxy = class_proxy()
filtered = {k:v for k,v in instance_params
if (k in obj_proxy.params())
and not obj_proxy.params(k).constant}
obj_proxy.set_param(**filtered)
return obj_proxy
@param.parameterized.bothmethod
def regexp_filter(self_or_cls, pattern):
"""
Builds a parameter filter using the supplied pattern (may be a
general Python regular expression)
"""
def inner_filter(name, p):
name_match = re.search(pattern,name)
if name_match is not None:
return True
doc_match = re.search(pattern,p.doc)
if doc_match is not None:
return True
return False
return inner_filter
[docs]class InfoPrinter(object):
"""
Class for printing other information related to an object that is
of use to the user.
"""
headings = ['\x1b[1;35m%s\x1b[0m', '\x1b[1;32m%s\x1b[0m']
ansi_escape = re.compile(r'\x1b[^m]*m')
ppager = ParamPager()
store = None
elements = []
[docs] @classmethod
def get_parameter_info(cls, obj, ansi=False, show_values=True,
pattern=None, max_col_len=40):
"""
Get parameter information from the supplied class or object.
"""
if cls.ppager is None: return ''
if pattern is not None:
obj = ParamFilter(obj, ParamFilter.regexp_filter(pattern))
if len(obj.params()) <=1:
return None
param_info = cls.ppager.get_param_info(obj)
param_list = cls.ppager.param_docstrings(param_info)
if not show_values:
retval = cls.ansi_escape.sub('', param_list) if not ansi else param_list
return cls.highlight(pattern, retval)
else:
info = cls.ppager(obj)
if ansi is False:
info = cls.ansi_escape.sub('', info)
return cls.highlight(pattern, info)
[docs] @classmethod
def heading(cls, heading_text, char='=', level=0, ansi=False):
"""
Turn the supplied heading text into a suitable heading with
optional underline and color.
"""
heading_color = cls.headings[level] if ansi else '%s'
if char is None:
return heading_color % '%s\n' % heading_text
else:
heading_ul = char*len(heading_text)
return heading_color % '%s\n%s\n%s' % (heading_ul, heading_text, heading_ul)
@classmethod
def highlight(cls, pattern, string):
if pattern is None: return string
return re.sub(pattern, '\033[43;1;30m\g<0>\x1b[0m',
string, flags=re.IGNORECASE)
[docs] @classmethod
def info(cls, obj, ansi=False, backend='matplotlib', visualization=True,
pattern=None, elements=[]):
"""
Show information about an object in the given category. ANSI
color codes may be enabled or disabled.
"""
cls.elements = elements
ansi_escape = re.compile(r'\x1b[^m]*m')
isclass = isinstance(obj, type)
name = obj.__name__ if isclass else obj.__class__.__name__
backend_registry = cls.store.registry.get(backend, {})
plot_class = backend_registry.get(obj if isclass else type(obj), None)
# Special case to handle PlotSelectors
if hasattr(plot_class, 'plot_classes'):
plot_class = list(plot_class.plot_classes.values())[0]
if visualization is False or plot_class is None:
if pattern is not None:
obj = ParamFilter(obj, ParamFilter.regexp_filter(pattern))
if len(obj.params()) <=1:
return ('No %r parameters found matching specified pattern %r'
% (name, pattern))
info = param.ipython.ParamPager()(obj)
if ansi is False:
info = ansi_escape.sub('', info)
return cls.highlight(pattern, info)
heading = name if isclass else '{name}: {group} {label}'.format(name=name,
group=obj.group,
label=obj.label)
prefix = heading
lines = [prefix, cls.object_info(obj, name, backend=backend, ansi=ansi)]
if not isclass:
lines += ['', cls.target_info(obj, ansi=ansi)]
if plot_class is not None:
lines += ['', cls.options_info(plot_class, ansi, pattern=pattern)]
return "\n".join(lines)
@classmethod
def get_target(cls, obj):
objtype=obj.__class__.__name__
group = group_sanitizer(obj.group)
label = ('.' + label_sanitizer(obj.label) if obj.label else '')
target = '{objtype}.{group}{label}'.format(objtype=objtype,
group=group,
label=label)
return (None, target) if hasattr(obj, 'values') else (target, None)
@classmethod
def target_info(cls, obj, ansi=False):
if isinstance(obj, type): return ''
targets = obj.traverse(cls.get_target)
elements, containers = zip(*targets)
element_set = set(el for el in elements if el is not None)
container_set = set(c for c in containers if c is not None)
element_info = None
if len(element_set) == 1:
element_info = 'Element: %s' % list(element_set)[0]
elif len(element_set) > 1:
element_info = 'Elements:\n %s' % '\n '.join(sorted(element_set))
container_info = None
if len(container_set) == 1:
container_info = 'Container: %s' % list(container_set)[0]
elif len(container_set) > 1:
container_info = 'Containers:\n %s' % '\n '.join(sorted(container_set))
heading = cls.heading('Target Specifications', ansi=ansi, char="-")
target_header = '\nTargets in this object available for customization:\n'
if element_info and container_info:
target_info = '%s\n\n%s' % (element_info, container_info)
else:
target_info = element_info if element_info else container_info
target_footer = ("\nTo see the options info for one of these target specifications,"
"\nwhich are of the form {type}[.{group}[.{label}]], do holoviews.help({type}).")
return '\n'.join([heading, target_header, target_info, target_footer])
@classmethod
def object_info(cls, obj, name, backend, ansi=False):
element = not getattr(obj, '_deep_indexable', False)
element_url ='http://holoviews.org/reference/elements/{backend}/{obj}.html'
container_url ='http://holoviews.org/reference/containers/{backend}/{obj}.html'
url = element_url if element else container_url
link = url.format(obj=name, backend=backend)
link = None if element and (name not in cls.elements) else link
msg = ("\nOnline example: {link}" if link else ''
+ "\nHelp for the data object: holoviews.help({obj})"
+ " or holoviews.help(<{lower}_instance>)")
return '\n'.join([msg.format(obj=name, lower=name.lower(), link=link)])
@classmethod
def options_info(cls, plot_class, ansi=False, pattern=None):
if plot_class.style_opts:
backend_name = plot_class.backend
style_info = ("\n(Consult %s's documentation for more information.)" % backend_name)
style_keywords = '\t%s' % ', '.join(plot_class.style_opts)
style_msg = '%s\n%s' % (style_keywords, style_info)
else:
style_msg = '\t<No style options available>'
param_info = cls.get_parameter_info(plot_class, ansi=ansi, pattern=pattern)
lines = [ cls.heading('Style Options', ansi=ansi, char="-"), '',
style_msg, '',
cls.heading('Plot Options', ansi=ansi, char="-"), '']
if param_info is not None:
lines += ["The plot options are the parameters of the plotting class:\n",
param_info]
elif pattern is not None:
lines+= ['No %r parameters found matching specified pattern %r.'
% (plot_class.__name__, pattern)]
else:
lines+= ['No %r parameters found.' % plot_class.__name__]
return '\n'.join(lines)
[docs]class PrettyPrinter(object):
"""
The PrettyPrinter used to print all HoloView objects via the
pprint classmethod.
"""
tab = ' '
type_formatter= ':{type}'
@classmethod
def pprint(cls, node):
reprval = cls.serialize(cls.recurse(node))
if sys.version_info.major == 2:
return str(reprval.encode("utf8"))
else:
return str(reprval)
@classmethod
def serialize(cls, lines):
accumulator = []
for level, line in lines:
accumulator.append((level *cls.tab) + line)
return "\n".join(accumulator)
@classmethod
def shift(cls, lines, shift=0):
return [(lvl+shift, line) for (lvl, line) in lines]
@classmethod
def padding(cls, items):
return max(len(p) for p in items) if len(items) > 1 else len(items[0])
[docs] @classmethod
def component_type(cls, node):
"Return the type.group.label dotted information"
if node is None: return ''
return cls.type_formatter.format(type=str(type(node).__name__))
[docs] @classmethod
def recurse(cls, node, attrpath=None, attrpaths=[], siblings=[], level=0, value_dims=True):
"""
Recursive function that builds up an ASCII tree given an
AttrTree node.
"""
level, lines = cls.node_info(node, attrpath, attrpaths, siblings, level, value_dims)
attrpaths = ['.'.join(k) for k in node.keys()] if hasattr(node, 'children') else []
siblings = [node.get(child) for child in attrpaths]
for attrpath in attrpaths:
lines += cls.recurse(node.get(attrpath), attrpath, attrpaths=attrpaths,
siblings=siblings, level=level+1, value_dims=value_dims)
return lines
[docs] @classmethod
def node_info(cls, node, attrpath, attrpaths, siblings, level, value_dims):
"""
Given a node, return relevant information.
"""
if hasattr(node, 'children'):
(lvl, lines) = (level, [(level, cls.component_type(node))])
elif hasattr(node, 'main'):
(lvl, lines) = cls.adjointlayout_info(node, siblings, level, value_dims)
elif getattr(node, '_deep_indexable', False):
(lvl, lines) = cls.ndmapping_info(node, siblings, level, value_dims)
elif hasattr(node, 'unit_format'):
(lvl, lines) = level, [(level, repr(node))]
else:
(lvl, lines) = cls.element_info(node, siblings, level, value_dims)
# The attribute indexing path acts as a prefix (if applicable)
if attrpath is not None:
padding = cls.padding(attrpaths)
(fst_lvl, fst_line) = lines[0]
lines[0] = (fst_lvl, '.'+attrpath.ljust(padding) +' ' + fst_line)
return (lvl, lines)
[docs] @classmethod
def element_info(cls, node, siblings, level, value_dims):
"""
Return the information summary for an Element. This consists
of the dotted name followed by an value dimension names.
"""
info = cls.component_type(node)
if siblings:
padding = cls.padding([cls.component_type(el) for el in siblings])
info.ljust(padding)
if len(node.kdims) >= 1:
info += cls.tab + '[%s]' % ','.join(d.name for d in node.kdims)
if value_dims and len(node.vdims) >= 1:
info += cls.tab + '(%s)' % ','.join(d.name for d in node.vdims)
return level, [(level, info)]
@classmethod
def adjointlayout_info(cls, node, siblings, level, value_dims):
first_line = cls.component_type(node)
lines = [(level, first_line)]
additional_lines = []
for component in list(node.data.values()):
additional_lines += cls.recurse(component, level=level)
lines += cls.shift(additional_lines, 1)
return level, lines
@classmethod
def ndmapping_info(cls, node, siblings, level, value_dims):
key_dim_info = '[%s]' % ','.join(d.name for d in node.kdims)
first_line = cls.component_type(node) + cls.tab + key_dim_info
lines = [(level, first_line)]
additional_lines = []
if len(node.data) == 0:
return level, lines
# .last has different semantics for GridSpace
last = list(node.data.values())[-1]
if hasattr(last, 'children'):
additional_lines = cls.recurse(last, level=level)
# NdOverlays, GridSpace, Ndlayouts
elif last is not None and getattr(last, '_deep_indexable'):
level, additional_lines = cls.ndmapping_info(last, [], level, value_dims)
else:
_, additional_lines = cls.element_info(last, siblings, level, value_dims)
lines += cls.shift(additional_lines, 1)
return level, lines
__all__ = ['PrettyPrinter', 'InfoPrinter']
