# Copyright (c) 2014, Juergen Riegel (FreeCAD@juergen-riegel.net)
# All rights reserved.

# This file is part of the StepClassLibrary (SCL).
#
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# modification, are permitted provided that the following conditions are met:
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#   this list of conditions and the following disclaimer in the documentation
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#   specific prior written permission.

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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"""Simple Part21 STEP reader

Reads a given STEP file. Maps the enteties and instaciate the
corosbonding classes.
In addition it writes out a graphwiz file with the entity graph.
"""

import Part21,sys



__title__="Simple Part21 STEP reader"
__author__ = "Juergen Riegel"
__version__ = "0.1 (Jan 2014)"



class SimpleParser:
    """ read the file

    Part21.Part21Parser Loads all instances definition of a Part21 file into memory.
    Two dicts are created:
    Part21.Part21Parser._instance_definition : stores attibutes, key is the instance integer id
    Part21.Part21Parser._number_of_ancestors : stores the number of ancestors of entity id. This enables
    to define the order of instances creation.
    """
    def __init__(self, filename):
        import time
        import sys
        self._p21loader = Part21.Part21Parser(filename)
        #self._p21loader._number_of_ancestors = {} # not needed, save memory
        self.schemaModule = None
        self.schemaClasses = None
        self.instanceMape = {}
        #for i in self._p21loader._instances_definition.keys():
        #    print i,self._p21loader._instances_definition[i][0],self._p21loader._instances_definition[i][1]

    def _writeGraphVizEdge(self,num,attrList,file):
        for i in attrList:
            if isinstance(i,list):
                self._writeGraphVizEdge(num,i,file)
            elif  isinstance(i,str):
                if not i == '' and i[0] == '#':
                    key = int(i[1:])
                    file.write('  '+`num`+' -> '+`key`+'\n')


    def writeGraphViz(self,fileName):
        print "Writing GraphViz file %s..."%fileName,
        gvFile = open(fileName,'w')

        gvFile.write('digraph G {\n  node [fontname=Verdana,fontsize=12]\n  node [style=filled]\n  node [fillcolor="#EEEEEE"]\n  node [color="#EEEEEE"]\n  edge [color="#31CEF0"]\n')
        for i in self._p21loader._instances_definition.keys():
            entityStr = '#'+`i`
            nameStr   = self._p21loader._instances_definition[i][0].lower()
            sttrStr   = `self._p21loader._instances_definition[i][1]`.replace('"','').replace("'",'').replace(" ",'')
            if len (sttrStr) > 40:
                sttrStr = sttrStr[:39]+'....'
            gvFile.write('  '+`i`+' [label="'+entityStr+'\n'+nameStr+'\n'+sttrStr+'"]\n')
            self._writeGraphVizEdge( i,self._p21loader._instances_definition[i][1],gvFile)
        gvFile.write('}\n')

    def instaciate(self):
        """Instaciate the python classe from the enteties"""
        import inspect
        # load the needed schema module
        if self._p21loader.get_schema_name() == 'config_control_design':
            import config_control_design
            self.schemaModule = config_control_design
        if self._p21loader.get_schema_name() == 'automotive_design':
            import automotive_design
            self.schemaModule = automotive_design

        if self.schemaModule:
            self.schemaClasses = dict(inspect.getmembers(self.schemaModule))

        for i in self._p21loader._instances_definition.keys():
            #print i
            if not self.instanceMape.has_key(i):
                self._create_entity_instance(i)

    def _create_entity_instance(self, instance_id):
        if self._p21loader._instances_definition.has_key(instance_id):
            instance_definition = self._p21loader._instances_definition[instance_id]
            #print "Instance definition to process",instance_definition
            # first find class name
            class_name = instance_definition[0].lower()
            #print "Class name:%s"%class_name

            if not class_name=='':
                classDef = self.schemaClasses[class_name]
                # then attributes
                #print object_.__doc__
            instance_attributes = instance_definition[1]
            self._transformAttributes(instance_attributes)
            print 'Attribute list after transform: ',instance_attributes

            self.instanceMape[instance_id] = str('dummy#:'+str(instance_id)) # dummy instance to test
        else:
            print '############################# lost entity: ',instance_id
            self.instanceMape[instance_id] = int(41) # dummy
        #print "instance_attributes:",instance_attributes
        #a = object_(*instance_attributes)

    def _transformAttributes(self,attrList):
        n = 0
        for i in attrList:
            if isinstance(i,list):
                self._transformAttributes(i)
            elif  isinstance(i,str):
                if i == '':
                    print 'empty string'
                elif i[0] == '#':
                    key = int(i[1:])
                    #print 'Item: ',int(i[1:])
                    if self.instanceMape.has_key(key):
                        attrList[n] =  self.instanceMape[key]
                    else:
                        self._create_entity_instance(key)
                        if not self.instanceMape.has_key(key):
                            raise NameError("Needed instance not instanciated: ",key)
                        else:
                            attrList[n] =  self.instanceMape[key]
                elif i[0] == '$':
                    #print 'Dollar'
                    pass
                elif i[0] == "'":
                    print 'Dopelstring: ',i[1:-1]
                else:
                    print 'String: ',i
            else:
                raise NameError("Unknown attribute type")
            n = n+1

if __name__ == "__main__":
    sys.path.append('..') # path where config_control_design.py is found
    parser = SimpleReader("Aufspannung.stp") # simple test file
    #parser.instaciate()
    parser.writeGraphViz('TestGrap.gv')
    #dot.exe -Tsvg -o Test.svg e:\fem-dev\src\Mod\Import\App\SCL\TestGrap-geo.gv
