diff options
Diffstat (limited to 'gerber/excellon.py')
| -rwxr-xr-x | gerber/excellon.py | 155 |
1 files changed, 150 insertions, 5 deletions
diff --git a/gerber/excellon.py b/gerber/excellon.py index 4166de6..1a498dc 100755 --- a/gerber/excellon.py +++ b/gerber/excellon.py @@ -24,16 +24,22 @@ This module provides Excellon file classes and parsing utilities from .excellon_statements import *
-from .cnc import CncFile, FileSettings
+from .cam import CamFile, FileSettings
+import math
def read(filename):
""" Read data from filename and return an ExcellonFile
"""
- return ExcellonParser().parse(filename)
+ detected_settings = detect_excellon_format(filename)
+ settings = FileSettings(**detected_settings)
+ zeros = ''
+ print('Detected %d:%d format with %s zero suppression' %
+ (settings.format[0], settings.format[1], settings.zero_suppression))
+ return ExcellonParser(settings).parse(filename)
-class ExcellonFile(CncFile):
+class ExcellonFile(CamFile):
""" A class representing a single excellon file
The ExcellonFile class represents a single excellon file.
@@ -83,8 +89,13 @@ class ExcellonFile(CncFile): class ExcellonParser(object):
""" Excellon File Parser
+
+ Parameters
+ ----------
+ settings : FileSettings or dict-like
+ Excellon file settings to use when interpreting the excellon file.
"""
- def __init__(self):
+ def __init__(self, settings=None):
self.notation = 'absolute'
self.units = 'inch'
self.zero_suppression = 'trailing'
@@ -95,7 +106,38 @@ class ExcellonParser(object): self.hits = []
self.active_tool = None
self.pos = [0., 0.]
-
+ if settings is not None:
+ self.units = settings['units']
+ self.zero_suppression = settings['zero_suppression']
+ self.notation = settings['notation']
+ self.format = settings['format']
+
+
+ @property
+ def coordinates(self):
+ return [(stmt.x, stmt.y) for stmt in self.statements if isinstance(stmt, CoordinateStmt)]
+
+ @property
+ def bounds(self):
+ xmin = ymin = 100000000000
+ xmax = ymax = -100000000000
+ for x, y in self.coordinates:
+ if x is not None:
+ xmin = x if x < xmin else xmin
+ xmax = x if x > xmax else xmax
+ if y is not None:
+ ymin = y if y < ymin else ymin
+ ymax = y if y > ymax else ymax
+ return ((xmin, xmax), (ymin, ymax))
+
+ @property
+ def hole_sizes(self):
+ return [stmt.diameter for stmt in self.statements if isinstance(stmt, ExcellonTool)]
+
+ @property
+ def hole_count(self):
+ return len(self.hits)
+
def parse(self, filename):
with open(filename, 'r') as f:
for line in f:
@@ -194,3 +236,106 @@ class ExcellonParser(object): return FileSettings(units=self.units, format=self.format,
zero_suppression=self.zero_suppression,
notation=self.notation)
+
+
+def detect_excellon_format(filename):
+ """ Detect excellon file decimal format and zero-suppression settings.
+
+ Parameters
+ ----------
+ filename : string
+ Name of the file to parse. This does not check if the file is actually
+ an Excellon file, so do that before calling this.
+
+ Returns
+ -------
+ settings : dict
+ Detected excellon file settings. Keys are
+ - `format`: decimal format as tuple (<int part>, <decimal part>)
+ - `zero_suppression`: zero suppression, 'leading' or 'trailing'
+ """
+ results = {}
+ detected_zeros = None
+ detected_format = None
+ zs_options = ('leading', 'trailing', )
+ format_options = ((2, 4), (2, 5), (3, 3),)
+
+ # Check for obvious clues:
+ p = ExcellonParser()
+ p.parse(filename)
+
+ # Get zero_suppression from a unit statement
+ zero_statements = [stmt.zero_suppression for stmt in p.statements
+ if isinstance(stmt, UnitStmt)]
+
+ # get format from altium comment
+ format_comment = [stmt.comment for stmt in p.statements
+ if isinstance(stmt, CommentStmt)
+ and 'FILE_FORMAT' in stmt.comment]
+
+ detected_format = (tuple([int(val) for val in
+ format_comment[0].split('=')[1].split(':')])
+ if len(format_comment) == 1 else None)
+ detected_zeros = zero_statements[0] if len(zero_statements) == 1 else None
+
+ # Bail out here if possible
+ if detected_format is not None and detected_zeros is not None:
+ return {'format': detected_format, 'zero_suppression': detected_zeros}
+
+ # Only look at remaining options
+ if detected_format is not None:
+ format_options = (detected_format,)
+ if detected_zeros is not None:
+ zs_options = (detected_zeros,)
+
+ # Brute force all remaining options, and pick the best looking one...
+ for zs in zs_options:
+ for fmt in format_options:
+ key = (fmt, zs)
+ settings = FileSettings(zero_suppression=zs, format=fmt)
+ try:
+ p = ExcellonParser(settings)
+ p.parse(filename)
+ size = tuple([t[1] - t[0] for t in p.bounds])
+ hole_area = 0.0
+ for hit in p.hits:
+ tool = hit[0]
+ hole_area += math.pow(math.pi * tool.diameter, 2)
+ results[key] = (size, p.hole_count, hole_area)
+ except:
+ pass
+
+ # See if any of the dimensions are left with only a single option
+ formats = set(key[0] for key in results.iterkeys())
+ zeros = set(key[1] for key in results.iterkeys())
+ if len(formats) == 1:
+ detected_format = formats.pop()
+ if len(zeros) == 1:
+ detected_zeros = zeros.pop()
+
+ # Bail out here if we got everything....
+ if detected_format is not None and detected_zeros is not None:
+ return {'format': detected_format, 'zero_suppression': detected_zeros}
+
+ # Otherwise score each option and pick the best candidate
+ else:
+ scores = {}
+ for key in results.keys():
+ size, count, diameter = results[key]
+ scores[key] = _layer_size_score(size, count, diameter)
+ minscore = min(scores.values())
+ for key in scores.iterkeys():
+ if scores[key] == minscore:
+ return {'format': key[0], 'zero_suppression': key[1]}
+
+
+def _layer_size_score(size, hole_count, hole_area):
+ """ Heuristic used for determining the correct file number interpretation.
+ Lower is better.
+ """
+ board_area = size[0] * size[1]
+ hole_percentage = hole_area / board_area
+ hole_score = (hole_percentage - 0.25) ** 2
+ size_score = (board_area - 8) **2
+ return hole_score * size_score
+
\ No newline at end of file |