1 files changed, 165 insertions, 0 deletions
diff --git a/gerber/excellon.py b/gerber/excellon.py
new file mode 100755
index 0000000..fef5844
--- /dev/null
+++ b/gerber/excellon.py
@@ -0,0 +1,165 @@
+#!/usr/bin/env python
+import re
+from itertools import tee, izip
+from .utils import parse_gerber_value
+    
+    
+INCH = 0
+METRIC = 1
+
+ABSOLUTE = 0
+INCREMENTAL = 1
+
+LZ = 0
+TZ = 1
+
+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:
+            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)
+    
+    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__':
+    tools = []
+    settings = {'units':INCH, 'zeros':LZ}
+    p = parser()
+    p.parse('examples/ncdrill.txt')
+            
+            
+\ No newline at end of file