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#-------------------------------------------------------------------------------
#
# A concrete implementation of the ITemplateDataNameItem interface that looks
# for a specified sub-context in its input context and outputs that as its
# output context if it is found.
#
# Written by: David C. Morrill
#
# Date: 07/29/2007
#
# (c) Copyright 2007 by Enthought, Inc.
#
#-------------------------------------------------------------------------------
""" A concrete implementation of the ITemplateDataNameItem interface that looks
for a specified sub-context in its input context and outputs that as its
output context if it is found.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from apptools.template.template_traits \
import TStr
from any_context_data_name_item \
import AnyContextDataNameItem
from helper \
import path_for, parse_name
#-------------------------------------------------------------------------------
# 'ContextDataNameItem' class:
#-------------------------------------------------------------------------------
class ContextDataNameItem ( AnyContextDataNameItem ):
""" A concrete implementation of the ITemplateDataNameItem interface that
looks for a specified sub-context in its input context and outputs that
as its output context if it is found.
"""
#-- Public Traits ----------------------------------------------------------
# The name of the context to be matched:
name = TStr
#-- Abstract Method Implementations ----------------------------------------
def filter ( self, name, context ):
""" Returns **True** if the specified *context* called *name* should be
included in the output context; and **False** otherwise.
"""
return (name == self.name_last)
#-- AnyDataNameItem Property Implementation Overrides ----------------------
def _get_data_name_item_choice ( self ):
return TemplateChoice( choice_value = self.name )
def _set_data_name_item_choice ( self, value ):
self.name = value.choice_value
def _get_data_name_item_choices ( self ):
return self._get_choices( self.input_data_context )
def _get_current_input_data_context ( self ):
context = self.input_data_context
for name in parse_name( self.name )[:-1]:
if name not in context.data_contexts:
return None
context = context.get_data_context( name )
return context
#-- Trait Event Handlers ---------------------------------------------------
def _name_changed ( self, name ):
""" Handles the 'name' trait being changed.
"""
self.name_last = parse_name( name )[-1]
self.inputs_changed()
#-- Private Methods --------------------------------------------------------
def _get_choices ( self, context, path = '' ):
""" Returns all of the valid TemplateChoices for this item.
"""
choices = []
gdc = context.get_data_context
for name in context.data_contexts:
next_path = path_for( path, name )
choices.append( TemplateChoice( choice_value = next_path ) )
choices.extend( self._get_choices( gdc( name ), next_path ) )
return choices
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