359 lines
12 KiB
Python
Executable file
359 lines
12 KiB
Python
Executable file
#! /usr/bin/env python
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# -*- coding: utf-8 -*-
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# copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Excellon File module
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====================
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**Excellon file classes**
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This module provides Excellon file classes and parsing utilities
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"""
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from .excellon_statements import *
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from .cam import CamFile, FileSettings
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from .primitives import Drill
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import math
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def read(filename):
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""" Read data from filename and return an ExcellonFile
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Parameters
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----------
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filename : string
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Filename of file to parse
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Returns
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-------
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file : :class:`gerber.excellon.ExcellonFile`
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An ExcellonFile created from the specified file.
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"""
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detected_settings = detect_excellon_format(filename)
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settings = FileSettings(**detected_settings)
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zeros = ''
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return ExcellonParser(settings).parse(filename)
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class ExcellonFile(CamFile):
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""" A class representing a single excellon file
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The ExcellonFile class represents a single excellon file.
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Parameters
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----------
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tools : list
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list of gerber file statements
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hits : list of tuples
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list of drill hits as (<Tool>, (x, y))
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settings : dict
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Dictionary of gerber file settings
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filename : string
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Filename of the source gerber file
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Attributes
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----------
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units : string
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either 'inch' or 'metric'.
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"""
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def __init__(self, statements, tools, hits, settings, filename=None):
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super(ExcellonFile, self).__init__(statements=statements,
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settings=settings,
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filename=filename)
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self.tools = tools
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self.hits = hits
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self.primitives = [Drill(position, tool.diameter)
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for tool, position in self.hits]
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@property
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def bounds(self):
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xmin = ymin = 100000000000
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xmax = ymax = -100000000000
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for tool, position in self.hits:
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radius = tool.diameter / 2.
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x = position[0]
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y = position[1]
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xmin = min(x - radius, xmin)
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xmax = max(x + radius, xmax)
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ymin = min(y - radius, ymin)
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ymax = max(y + radius, ymax)
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return ((xmin, xmax), (ymin, ymax))
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def report(self):
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""" Print drill report
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"""
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pass
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def write(self, filename):
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with open(filename, 'w') as f:
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for statement in self.statements:
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f.write(statement.to_excellon() + '\n')
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class ExcellonParser(object):
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""" Excellon File Parser
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Parameters
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----------
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settings : FileSettings or dict-like
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Excellon file settings to use when interpreting the excellon file.
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"""
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def __init__(self, settings=None):
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self.notation = 'absolute'
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self.units = 'inch'
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self.zero_suppression = 'trailing'
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self.format = (2, 5)
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self.state = 'INIT'
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self.statements = []
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self.tools = {}
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self.hits = []
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self.active_tool = None
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self.pos = [0., 0.]
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if settings is not None:
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self.units = settings.units
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self.zero_suppression = settings.zero_suppression
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self.notation = settings.notation
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self.format = settings.format
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@property
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def coordinates(self):
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return [(stmt.x, stmt.y) for stmt in self.statements if isinstance(stmt, CoordinateStmt)]
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@property
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def bounds(self):
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xmin = ymin = 100000000000
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xmax = ymax = -100000000000
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for x, y in self.coordinates:
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if x is not None:
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xmin = x if x < xmin else xmin
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xmax = x if x > xmax else xmax
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if y is not None:
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ymin = y if y < ymin else ymin
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ymax = y if y > ymax else ymax
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return ((xmin, xmax), (ymin, ymax))
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@property
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def hole_sizes(self):
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return [stmt.diameter for stmt in self.statements if isinstance(stmt, ExcellonTool)]
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@property
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def hole_count(self):
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return len(self.hits)
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def parse(self, filename):
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with open(filename, 'r') as f:
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for line in f:
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self._parse(line.strip())
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return ExcellonFile(self.statements, self.tools, self.hits,
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self._settings(), filename)
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def _parse(self, line):
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#line = line.strip()
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zs = self._settings().zero_suppression
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fmt = self._settings().format
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if line[0] == ';':
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self.statements.append(CommentStmt.from_excellon(line))
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elif line[:3] == 'M48':
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self.statements.append(HeaderBeginStmt())
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self.state = 'HEADER'
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elif line[0] == '%':
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self.statements.append(RewindStopStmt())
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if self.state == 'HEADER':
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self.state = 'DRILL'
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elif line[:3] == 'M95':
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self.statements.append(HeaderEndStmt())
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if self.state == 'HEADER':
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self.state = 'DRILL'
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elif line[:3] == 'M30':
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stmt = EndOfProgramStmt.from_excellon(line)
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self.statements.append(stmt)
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elif line[:3] == 'G00':
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self.state = 'ROUT'
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elif line[:3] == 'G05':
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self.state = 'DRILL'
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elif (('INCH' in line or 'METRIC' in line) and
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('LZ' in line or 'TZ' in line)):
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stmt = UnitStmt.from_excellon(line)
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self.units = stmt.units
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self.zero_suppression = stmt.zero_suppression
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self.statements.append(stmt)
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elif line[:3] == 'M71' or line [:3] == 'M72':
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stmt = MeasuringModeStmt.from_excellon(line)
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self.units = stmt.units
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self.statements.append(stmt)
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elif line[:3] == 'ICI':
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stmt = IncrementalModeStmt.from_excellon(line)
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self.notation = 'incremental' if stmt.mode == 'on' else 'absolute'
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self.statements.append(stmt)
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elif line[:3] == 'VER':
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stmt = VersionStmt.from_excellon(line)
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self.statements.append(stmt)
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elif line[:4] == 'FMAT':
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stmt = FormatStmt.from_excellon(line)
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self.statements.append(stmt)
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elif line[0] == 'T' and self.state == 'HEADER':
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tool = ExcellonTool.from_excellon(line, self._settings())
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self.tools[tool.number] = tool
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self.statements.append(tool)
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elif line[0] == 'T' and self.state != 'HEADER':
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stmt = ToolSelectionStmt.from_excellon(line)
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self.active_tool = self.tools[stmt.tool]
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self.statements.append(stmt)
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elif line[0] in ['X', 'Y']:
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stmt = CoordinateStmt.from_excellon(line, fmt, zs)
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x = stmt.x
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y = stmt.y
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self.statements.append(stmt)
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if self.notation == 'absolute':
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if x is not None:
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self.pos[0] = x
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if y is not None:
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self.pos[1] = y
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else:
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if x is not None:
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self.pos[0] += x
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if y is not None:
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self.pos[1] += y
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if self.state == 'DRILL':
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self.hits.append((self.active_tool, tuple(self.pos)))
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self.active_tool._hit()
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else:
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self.statements.append(UnknownStmt.from_excellon(line))
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def _settings(self):
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return FileSettings(units=self.units, format=self.format,
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zero_suppression=self.zero_suppression,
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notation=self.notation)
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def detect_excellon_format(filename):
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""" Detect excellon file decimal format and zero-suppression settings.
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Parameters
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----------
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filename : string
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Name of the file to parse. This does not check if the file is actually
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an Excellon file, so do that before calling this.
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Returns
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-------
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settings : dict
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Detected excellon file settings. Keys are
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- `format`: decimal format as tuple (<int part>, <decimal part>)
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- `zero_suppression`: zero suppression, 'leading' or 'trailing'
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"""
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results = {}
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detected_zeros = None
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detected_format = None
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zs_options = ('leading', 'trailing', )
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format_options = ((2, 4), (2, 5), (3, 3),)
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# Check for obvious clues:
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p = ExcellonParser()
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p.parse(filename)
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# Get zero_suppression from a unit statement
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zero_statements = [stmt.zero_suppression for stmt in p.statements
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if isinstance(stmt, UnitStmt)]
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# get format from altium comment
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format_comment = [stmt.comment for stmt in p.statements
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if isinstance(stmt, CommentStmt)
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and 'FILE_FORMAT' in stmt.comment]
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detected_format = (tuple([int(val) for val in
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format_comment[0].split('=')[1].split(':')])
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if len(format_comment) == 1 else None)
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detected_zeros = zero_statements[0] if len(zero_statements) == 1 else None
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# Bail out here if possible
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if detected_format is not None and detected_zeros is not None:
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return {'format': detected_format, 'zero_suppression': detected_zeros}
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# Only look at remaining options
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if detected_format is not None:
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format_options = (detected_format,)
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if detected_zeros is not None:
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zs_options = (detected_zeros,)
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# Brute force all remaining options, and pick the best looking one...
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for zs in zs_options:
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for fmt in format_options:
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key = (fmt, zs)
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settings = FileSettings(zero_suppression=zs, format=fmt)
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try:
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p = ExcellonParser(settings)
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p.parse(filename)
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size = tuple([t[1] - t[0] for t in p.bounds])
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hole_area = 0.0
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for hit in p.hits:
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tool = hit[0]
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hole_area += math.pow(math.pi * tool.diameter / 2., 2)
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results[key] = (size, p.hole_count, hole_area)
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except:
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pass
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# See if any of the dimensions are left with only a single option
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formats = set(key[0] for key in results.iterkeys())
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zeros = set(key[1] for key in results.iterkeys())
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if len(formats) == 1:
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detected_format = formats.pop()
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if len(zeros) == 1:
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detected_zeros = zeros.pop()
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# Bail out here if we got everything....
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if detected_format is not None and detected_zeros is not None:
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return {'format': detected_format, 'zero_suppression': detected_zeros}
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# Otherwise score each option and pick the best candidate
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else:
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scores = {}
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for key in results.keys():
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size, count, diameter = results[key]
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scores[key] = _layer_size_score(size, count, diameter)
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minscore = min(scores.values())
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for key in scores.iterkeys():
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if scores[key] == minscore:
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return {'format': key[0], 'zero_suppression': key[1]}
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def _layer_size_score(size, hole_count, hole_area):
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""" Heuristic used for determining the correct file number interpretation.
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Lower is better.
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"""
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board_area = size[0] * size[1]
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hole_percentage = hole_area / board_area
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hole_score = (hole_percentage - 0.25) ** 2
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size_score = (board_area - 8) **2
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return hole_score * size_score
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