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diff --git a/gerber/excellon_statements.py b/gerber/excellon_statements.py
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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.
+
+from .utils import write_gerber_value
+
+
+__all__ = ['ExcellonTool', 'CommentStmt', 'HeaderBeginStmt', 'HeaderEndStmt',
+ ]
+
+
+class ExcellonStatement(object):
+ """ Excellon Statement abstract base class
+ """
+ def to_excellon(self):
+ pass
+
+
+class ExcellonTool(ExcellonStatement):
+ """ Excellon Tool class
+
+ Parameters
+ ----------
+ settings : FileSettings (dict-like)
+ File-wide settings.
+
+ kwargs : dict-like
+ Tool settings from the excellon statement. Valid keys are:
+ diameter : Tool diameter [expressed in file units]
+ rpm : Tool RPM
+ feed_rate : Z-axis tool feed rate
+ retract_rate : Z-axis tool retraction rate
+ max_hit_count : Number of hits allowed before a tool change
+ depth_offset : Offset of tool depth from tip of tool.
+
+ Attributes
+ ----------
+ number : integer
+ Tool number from the excellon file
+
+ diameter : float
+ Tool diameter in file units
+
+ rpm : float
+ Tool RPM
+
+ feed_rate : float
+ Tool Z-axis feed rate.
+
+ retract_rate : float
+ Tool Z-axis retract rate
+
+ depth_offset : float
+ Offset of depth measurement from tip of tool
+
+ max_hit_count : integer
+ Maximum number of tool hits allowed before a tool change
+
+ hit_count : integer
+ Number of tool hits in excellon file.
+ """
+
+ @classmethod
+ def from_line(cls, line, settings):
+ """ Create a Tool from an excellon file tool definition line.
+
+ Parameters
+ ----------
+ line : string
+ Tool definition line from an excellon file.
+
+ settings : FileSettings (dict-like)
+ Excellon file-wide settings
+
+ Returns
+ -------
+ tool : Tool
+ An ExcellonTool representing the tool defined in `line`
+ """
+ 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 from_dict(cls, settings, tool_dict):
+ return cls(settings, tool_dict)
+
+ def __init__(self, settings, **kwargs):
+ self.settings = settings
+ 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.hit_count = 0
+
+ def to_excellon(self):
+ fmt = self.settings['format']
+ zs = self.settings['zero_suppression']
+ stmt = 'T%d' % self.number
+ if self.retract_rate:
+ stmt += 'B%s' % write_gerber_value(self.retract_rate, fmt, zs)
+ if self.diameter:
+ stmt += 'C%s' % write_gerber_value(self.diameter, fmt, zs)
+ if self.feed_rate:
+ stmt += 'F%s' % write_gerber_value(self.feed_rate, fmt, zs)
+ if self.max_hit_count:
+ stmt += 'H%s' % write_gerber_value(self.max_hit_count, fmt, zs)
+ if self.rpm:
+ if self.rpm < 100000.:
+ stmt += 'S%s' % write_gerber_value(self.rpm / 1000., fmt, zs)
+ else:
+ stmt += 'S%g' % self.rpm / 1000.
+ if self.depth_offset:
+ stmt += 'Z%s' % write_gerber_value(self.depth_offset, fmt, zs)
+ return stmt
+
+ def _hit(self):
+ self.hit_count += 1
+
+ def __repr__(self):
+ unit = 'in.' if self.settings.units == 'inch' else 'mm'
+ return '<ExcellonTool %d: %0.3f%s dia.>' % (self.number, self.diameter, unit)
+
+
+class CommentStmt(ExcellonStatement):
+ def __init__(self, comment):
+ self.comment = comment
+
+ def to_excellon(self):
+ return ';%s' % comment
+
+
+class HeaderBeginStmt(ExcellonStatement):
+
+ def __init__(self):
+ pass
+
+ def to_excellon(self):
+ return 'M48'
+
+
+class HeaderEndStmt(ExcellonStatement):
+
+ def __init__(self):
+ pass
+
+ def to_excellon(self):
+ return 'M95'
+
+
+class RewindStopStmt(ExcellonStatement):
+
+ def __init__(self):
+ pass
+
+ def to_excellon(self):
+ return '%'
+
+
+class EndOfProgramStmt(ExcellonStatement):
+
+ def __init__(self, x=None, y=None):
+ self.x = x
+ self.y = y
+
+ def to_excellon(self):
+ stmt = 'M30'
+ if self.x is not None:
+ stmt += 'X%s' % write_gerber_value(self.x)
+ if self.y is not None:
+ stmt += 'Y%s' % write_gerber_value(self.y)
+
+
+class UnitStmt(ExcellonStatement):
+
+ def __init__(self, units='inch', zero_suppression='trailing'):
+ self.units = units.lower()
+ self.zero_suppression = zero_suppression
+
+ def to_excellon(self):
+ stmt = '%s,%s' % ('INCH' if self.units == 'inch' else 'METRIC',
+ 'LZ' if self.zero_suppression == 'trailing' else 'TZ')
+
+
+class IncrementalModeStmt(ExcellonStatement):
+
+ def __init__(self, mode='off'):
+ if mode.lower() not in ['on', 'off']:
+ raise ValueError('Mode may be "on" or "off")
+ self.mode = 'off'
+
+ def to_excellon(self):
+ return 'ICI,%s' % 'OFF' if self.mode == 'off' else 'ON'
+
+
+class VersionStmt(ExcellonStatement):
+
+ def __init__(self, version=1):
+ self.version = int(version)
+
+ def to_excellon(self):
+ return 'VER,%d' % self.version
+
+
+class FormatStmt(ExcellonStatement):
+ def __init__(self, format=1):
+ self.format = int(format)
+
+ def to_excellon(self):
+ return 'FMAT,%d' % self.format
+
+
+class LinkToolStmt(ExcellonStatement):
+
+ def __init__(self, linked_tools):
+ self.linked_tools = [int(x) for x in linked_tools]
+
+ def to_excellon(self):
+ return '/'.join([str(x) for x in self.linked_tools])
+
+
+class MeasuringModeStmt(ExcellonStatement):
+
+ def __init__(self, units='inch'):
+ units = units.lower()
+ if units not in ['inch', 'metric']:
+ raise ValueError('units must be "inch" or "metric"')
+ self.units = units
+
+ def to_excellon(self):
+ return 'M72' if self.units == 'inch' else 'M71'
+
+