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(preparations) Implement CompoundExplorer

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A compound tree traversal iterator object.
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DeepSOIC 2015-10-22 01:27:42 +03:00
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#***************************************************************************
#* *
#* Copyright (c) 2015 - Victor Titov (DeepSOIC) *
#* <vv.titov@gmail.com> *
#* *
#* This program is free software; you can redistribute it and/or modify *
#* it under the terms of the GNU Lesser General Public License (LGPL) *
#* as published by the Free Software Foundation; either version 2 of *
#* the License, or (at your option) any later version. *
#* for detail see the LICENCE text file. *
#* *
#* This program is distributed in the hope that it will be useful, *
#* but WITHOUT ANY WARRANTY; without even the implied warranty of *
#* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
#* GNU Library General Public License for more details. *
#* *
#* You should have received a copy of the GNU Library General Public *
#* License along with this program; if not, write to the Free Software *
#* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
#* USA *
#* *
#***************************************************************************
import Part
class CompoundExplorer:
"""
CompoundExplorer: Iterator class to traverse compound hierarchy.
Usage:
for (child, msg, it) in latticeBaseFeature.CompoundExplorer(App.ActiveDocument.Compound.Shape):
#child is a shape.
#msg is int equal to one of three constants:
# CompoundExplorer.MSG_LEAF - child is a leaf (non-compound)
# CompoundExplorer.MSG_DIVEDOWN - child is a compound that is about to be traversed
# CompoundExplorer.MSG_BUBBLEUP - child is a compound that was just finished traversing
#it is reference to iterator class (can be useful to extract current depth, or index stack)
print ' ' * it.curDepth(), (child, msg)
Output:
(<Compound object at 0000002FD26E5FC0>, 2)
(<Solid object at 0000002FCD21D380>, 1)
(<Compound object at 0000002FCD21D280>, 2)
(<Solid object at 0000002FCD21D7C0>, 1)
(<Solid object at 0000002FCD21D440>, 1)
(<Compound object at 0000002FCD21D280>, 3)
(<Compound object at 0000002FD26E5FC0>, 3)
"""
#constants
MSG_LEAF = 1 #the iterator has output a leaf of the compound structure tree (a shape that is not a compound)
MSG_DIVEDOWN = 2 #the iterator is entering a subcompound. Shape is the subcompound about to be iterated
MSG_BUBBLEUP = 3 #the iterator has finished traversing a subcompound and leaves it. Shape is the compound that was just iterated through.
def __init__(self, compound):
self.compound = compound
self.indexStack = [-1]
#childStructure: list of lists of shapes.
# It is for storing the stack of childShapes. The last in the
# list is the list of children being traversed at the moment.
# When just starting, the list contains the base shape - the compound itself.
# After first iteration, childShapes of compound are added as a second item.
# If among those childshapes, a subcompound is encountered, its childShapes are added as the next item.
# When finishing the iteration of a subcompound, the last item is removed from this list.
# The length of this list should always be equal to the length of indexStack
self.childStructure = [[compound]]
self.lastMsg = self.MSG_BUBBLEUP
def __iter__(self):
return self
def nxtDepth(self):
'''
nxtDepth(): Returns depth inside compound hierarchy that is being entered (applicable when depth is changing, i.e. msg != MSG_LEAF).
For reference: depth of the base shape (compound that was supplied when initiating the loop) is zero.
'''
assert(len(self.indexStack) == len(self.childStructure))
return len(self.indexStack) - 1
def prevDepth(self):
'''
prevDepth(): Returns depth inside compound hierarchy that is being left (applicable when depth is changing, i.e. msg != MSG_LEAF).
For reference: depth of the base shape (compound that was supplied when initiating the loop) is zero.
'''
if self.lastMsg == self.MSG_BUBBLEUP:
return self.nxtDepth() + 1
elif self.lastMsg == self.MSG_DIVEDOWN:
return self.nxtDepth() - 1
else:
return self.nxtDepth()
def curDepth(self):
'''
curDepth(): Returns depth inside compound hierarchy of the item that was just returned.
For reference: depth of the base shape (compound that was supplied when initiating the loop) is zero.
'''
if self.lastMsg == self.MSG_BUBBLEUP:
return self.nxtDepth()
elif self.lastMsg == self.MSG_DIVEDOWN:
return self.nxtDepth() - 1
else:
return self.nxtDepth()
def next(self):
"""Returns a tuple: (child,message,self). """
d = self.nxtDepth()
if d == -1:
raise StopIteration()
self.indexStack[d] += 1
i = self.indexStack[d]
if i > len(self.childStructure[d])-1: #index gone out of range - finished traversing a subcompound
msg = self.MSG_BUBBLEUP
self.indexStack.pop()
self.childStructure.pop()
if len(self.indexStack) == 0:
raise StopIteration()
i = self.indexStack[d-1]
sh = self.childStructure[d-1][i]
else:
sh = self.childStructure[d][i]
if sh.ShapeType == 'Compound':
msg = self.MSG_DIVEDOWN
self.indexStack.append(-1)
self.childStructure.append(sh.childShapes())
else:
msg = self.MSG_LEAF
assert(msg != 0)
self.lastMsg = msg
return (sh, msg, self)