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#!/usr/bin/python
'''this file more or less describes the grammar used for constructing things out of Lego
not done. see http://mr-bucket.co.uk/GLIDE/LCD_File_Format.html#Implimentation
for part examples see http://guide.lugnet.com/partsref/search.cgi?q=XXXX
or http://img.lugnet.com/ld/XXXX.gif
'''
import os
import skdb
class Joint:
'''should pull in some kinematics from elsewhere; PyODE?'''
pass
class SphericalJoint(Joint): pass
class PlanarJoint(Joint): pass
class RevoluteJoint(Joint): pass
class PrismaticJoint(Joint): pass
class GearJoint(Joint): pass
class Discrete:
'''allows only a certain set of values'''
pass
grammar = {}
class Feature(skdb.Interface):
yaml_tag='!lego_feature'
yaml_flow_style=False
def __init__(self, name=None, type=None, part=None):
skdb.Interface.__init__(self, name=name, part=part)
self.type=type
def post_init_hook(self):
try:
type = self.type
self.overlay(grammar[type])
except KeyError: self.type = None
try: name = self.name
except AttributeError: name = None
def compatible(self, other):
if type(self.complement) is not list: self.complement = [self.complement]
if type(other.complement) is not list: other.complement = [other.complement]
if other.type in self.complement:
assert self.type in other.complement, 'vice versa not fulfilled for "%s" and "%s"' %(self.type, other.type)
return True
else: return False
def __repr__(self):
try: part_name = self.part.name
except AttributeError: part_name = None
#return "%s(part=%s,name=%s, type=%s)" % (self.__class__.__name__, part_name, self.name, self.type)
return "%s(name=%s)" % (self.__class__.__name__, self.name)
def example_picture(self):
'''example should be an ldraw number'''
return "http://img.lugnet.com/ld/"+self.example+".gif"
def example_lugnet(self):
return "http://guide.lugnet.com/partsref/search.cgi?q="+self.example
def example_peeron(self):
return "http://www.peeron.com/inv/parts/"+self.example
class PressFit(Feature):
'''this should probably link up with some other class'''
pass
class SnapFit(Feature):
'''same as PressFit but with less friction, and a restorative force'''
pass
class Hinge(RevoluteJoint, SnapFit): pass
#class Grammar(skdb.FennObject, dict):
# yaml_tag='!lego_grammar'
fh = skdb.package_file('lego', 'grammar.yaml')
grammar = skdb.load(fh)['features']
#stuff values
for key in grammar.keys():
grammar[key].name = key
grammar[key].type = key
def dump_grammar_file():
'''you probably should pipe through 'grep -v name'''''
import yaml
return yaml.dump(grammar)
if __name__ == '__main__':
print dump_grammar_file()
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