Merge pull request #3 from hamiltonkibbe/excellon_support

Add Excellon support

1 files changed, 180 insertions, 0 deletions

diff --git a/gerber/excellon.py b/gerber/excellon.py
new file mode 100755
index 0000000..1e746ad
--- /dev/null
+++ b/gerber/excellon.py
@@ -0,0 +1,180 @@
+#!/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.

+

+

+import re

+from itertools import tee, izip

+from .utils import parse_gerber_value

+    

+

+

+

+class Tool(object):

+

+    @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:

+            zeros = 'L' if self.zero_suppression == 'leading' else 'T'

+            x = self.format

+            y = self.format

+            self.ctx.set_coord_format(zeros, x, y)

+    def parse(self, filename):

+        with open(filename, 'r') as f:

+            for line in f:

+                self._parse(line)

+    

+    def dump(self, filename='teste.svg'):

+        if self.ctx is not None:

+            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.zero_suppression = 'trailing'

+            

+        elif 'TZ' in line:

+            self.zero_suppression = 'leading'

+

+        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 = 'absolute'

+        

+        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__':

+    from .render_svg import GerberSvgContext

+    tools = []

+    p = ExcellonParser(GerberSvgContext())

+    p.parse('examples/ncdrill.txt')

+    p.dump('excellon.svg')

+            

+            
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