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#!/usr/bin/env python
import re
from itertools import tee, izip
from .utils import parse_gerber_value
def read(filename):
""" Read data from filename and return an ExcellonFile
"""
return ExcellonParser().parse(filename)
class ExcellonFile(object):
""" A class representing a single excellon file
The ExcellonFile class represents a single excellon file.
Parameters
----------
tools : list
list of gerber file statements
hits : list of tuples
list of drill hits as (<Tool>, (x, y))
settings : dict
Dictionary of gerber file settings
filename : string
Filename of the source gerber file
Attributes
----------
units : string
either 'inch' or 'metric'.
"""
def __init__(self, tools, hits, settings, filename):
self.tools = tools
self.hits = hits
self.settings = settings
self.filename = filename
def report(self):
""" Print drill report
"""
pass
def render(self, filename, ctx):
""" Generate image of file
"""
for tool, pos in self.hits:
ctx.drill(pos[0], pos[1], tool.diameter)
ctx.dump(filename)
class Tool(object):
""" Excellon Tool class
"""
@classmethod
def from_line(cls, line, settings):
commands = re.split('([BCFHSTZ])', line)[1:]
commands = [(command, value) for command, value in pairwise(commands)]
args = {}
format = settings['format']
zero_suppression = settings['zero_suppression']
for cmd, val in commands:
if cmd == 'B':
args['retract_rate'] = parse_gerber_value(val, format, zero_suppression)
elif cmd == 'C':
args['diameter'] = parse_gerber_value(val, format, zero_suppression)
elif cmd == 'F':
args['feed_rate'] = parse_gerber_value(val, format, zero_suppression)
elif cmd == 'H':
args['max_hit_count'] = parse_gerber_value(val, format, zero_suppression)
elif cmd == 'S':
args['rpm'] = 1000 * parse_gerber_value(val, format, zero_suppression)
elif cmd == 'T':
args['number'] = int(val)
elif cmd == 'Z':
args['depth_offset'] = parse_gerber_value(val, format, zero_suppression)
return cls(settings, **args)
def __init__(self, settings, **kwargs):
self.number = kwargs.get('number')
self.feed_rate = kwargs.get('feed_rate')
self.retract_rate = kwargs.get('retract_rate')
self.rpm = kwargs.get('rpm')
self.diameter = kwargs.get('diameter')
self.max_hit_count = kwargs.get('max_hit_count')
self.depth_offset = kwargs.get('depth_offset')
self.units = settings.get('units', 'inch')
def __repr__(self):
unit = 'in.' if self.units == 'inch' else 'mm'
return '<Tool %d: %0.3f%s dia.>' % (self.number, self.diameter, unit)
class ExcellonParser(object):
def __init__(self, ctx=None):
self.ctx = ctx
self.notation = 'absolute'
self.units = 'inch'
self.zero_suppression = 'trailing'
self.format = (2, 5)
self.state = 'INIT'
self.tools = []
self.hits = []
self.active_tool = None
self.pos = [0., 0.]
if ctx is not None:
self.ctx.set_coord_format(zero_suppression='trailing',
format=(2, 5), notation='absolute')
def parse(self, filename):
with open(filename, 'r') as f:
for line in f:
self._parse(line)
settings = {'notation': self.notation, 'units': self.units,
'zero_suppression': self.zero_suppression,
'format': self.format}
return ExcellonFile(self.tools, self.hits, settings, filename)
def dump(self, filename):
self.ctx.dump(filename)
def _parse(self, line):
if 'M48' in line:
self.state = 'HEADER'
if 'G00' in line:
self.state = 'ROUT'
if 'G05' in line:
self.state = 'DRILL'
elif line[0] == '%' and self.state == 'HEADER':
self.state = 'DRILL'
if 'INCH' in line or line.strip() == 'M72':
self.units = 'inch'
elif 'METRIC' in line or line.strip() == 'M71':
self.units = 'metric'
if 'LZ' in line:
self.zeros = 'L'
elif 'TZ' in line:
self.zeros = 'T'
if 'ICI' in line and 'ON' in line or line.strip() == 'G91':
self.notation = 'incremental'
if 'ICI' in line and 'OFF' in line or line.strip() == 'G90':
self.notation = 'incremental'
zs = self._settings()['zero_suppression']
fmt = self._settings()['format']
# tool definition
if line[0] == 'T' and self.state == 'HEADER':
tool = Tool.from_line(line, self._settings())
self.tools[tool.number] = tool
elif line[0] == 'T' and self.state != 'HEADER':
self.active_tool = self.tools[int(line.strip().split('T')[1])]
if line[0] in ['X', 'Y']:
x = None
y = None
if line[0] == 'X':
splitline = line.strip('X').split('Y')
x = parse_gerber_value(splitline[0].strip(), fmt, zs)
if len(splitline) == 2:
y = parse_gerber_value(splitline[1].strip(), fmt, zs)
else:
y = parse_gerber_value(line.strip(' Y'), fmt, zs)
if self.notation == 'absolute':
if x is not None:
self.pos[0] = x
if y is not None:
self.pos[1] = y
else:
if x is not None:
self.pos[0] += x
if y is not None:
self.pos[1] += y
if self.state == 'DRILL':
self.hits.append((self.active_tool, self.pos))
if self.ctx is not None:
self.ctx.drill(self.pos[0], self.pos[1],
self.active_tool.diameter)
def _settings(self):
return {'units': self.units, 'zero_suppression': self.zero_suppression,
'format': self.format}
def pairwise(iterator):
itr = iter(iterator)
while True:
yield tuple([itr.next() for i in range(2)])
if __name__ == '__main__':
p = parser()
p.parse('examples/ncdrill.txt')
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