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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
gerber.cnc
============
**CNC file classes**
This module provides common base classes for Excellon/Gerber CNC files
"""
class FileSettings(object):
""" CNC File Settings
Provides a common representation of gerber/excellon file settings
"""
def __init__(self, notation='absolute', units='inch',
zero_suppression='trailing', format=(2,5)):
if notation not in ['absolute', 'incremental']:
raise ValueError('Notation must be either absolute or incremental')
self.notation = notation
if units not in ['inch', 'metric']:
raise ValueError('Units must be either inch or metric')
self.units = units
if zero_suppression not in ['leading', 'trailing']:
raise ValueError('Zero suppression must be either leading or \
trailling')
self.zero_suppression = zero_suppression
if len(format) != 2:
raise ValueError('Format must be a tuple(n=2) of integers')
self.format = format
def __getitem__(self, key):
if key == 'notation':
return self.notation
elif key == 'units':
return self.units
elif key =='zero_suppression':
return self.zero_suppression
elif key == 'format':
return self.format
else:
raise KeyError()
class CncFile(object):
""" Base class for Gerber/Excellon files.
Provides a common set of settings parameters.
Parameters
----------
settings : FileSettings
The current file configuration.
filename : string
Name of the file that this CncFile represents.
Attributes
----------
settings : FileSettings
File settings as a FileSettings object
notation : string
File notation setting. May be either 'absolute' or 'incremental'
units : string
File units setting. May be 'inch' or 'metric'
zero_suppression : string
File zero-suppression setting. May be either 'leading' or 'trailling'
format : tuple (<int>, <int>)
File decimal representation format as a tuple of (integer digits,
decimal digits)
"""
def __init__(self, settings=None, filename=None):
if settings is not None:
self.notation = settings['notation']
self.units = settings['units']
self.zero_suppression = settings['zero_suppression']
self.format = settings['format']
else:
self.notation = 'absolute'
self.units = 'inch'
self.zero_suppression = 'trailing'
self.format = (2,5)
self.filename = filename
@property
def settings(self):
""" File settings
Returns
-------
settings : FileSettings (dict-like)
A FileSettings object with the specified configuration.
"""
return FileSettings(self.notation, self.units, self.zero_suppression,
self.format)
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