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Old gerber files used to define a hole in a plane using a self-intersecting polygon. This can be supported with the existing Geometry::Polygon class, but it might be worth looking into creating a special case for it.

http://en.wikipedia.org/wiki/Simple_polygon#Weakly_simple_polygon

Add a Gerber#name property

Index the geometry by Aperture object, not by definition number.
This implies that the Layer parser needs to convert numbers into Aperture objects.

Instead of the hash that's being used now

The latest version of the specification has renamed Layer to Level to avoid confusion with PCB layers:

Name change: level instead of layer. Previous revisions of the specification contained a construct called a layer. As these were often confused with PCB layers they have been renamed as levels. This does not alter the Gerber files.

Both G04 blocks and Aperture Macro comments.
Older files tend to contain a lot of comments. Stripping comments would save bytes and processing time considering that automated tools tend to ignore them anyway.

"flash aperture:10 at:[1,2]" generates a flash for aperture 10 at Point[1,2]

IPNEG is deprecated and should never be generated. Converting images during import relieves the need to be able to write negative polarity images.

Don't store the rotation value in the final Gerber object, just transform the geometry as it's parsed.

Hi, bfoz,

I want to parser a gerber file in my Mac OS X 10.9. But it seem can't work.

Log:

LoadError: cannot load such file -- units
from /Users/xiaobo/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/xiaobo/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/xiaobo/.rvm/gems/ruby-2.1.1/gems/gerber-1/lib/gerber.rb:2:in `<top (required)>'
from /Users/xiaobo/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in `require'
from /Users/xiaobo/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
from /Users/xiaobo/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:144:in `require'
from (irb):1
from /Users/xiaobo/.rvm/rubies/ruby-2.1.1/bin/irb:11:in `<main>'

Returns a bounding rectangle

Translate the commands into Geometry::Path objects

Raise an exception if the file doesn't specify units?

Walk the aperture and level arrays to see if any of the values have units set. If no units are set anywhere, default to millimeters.

Maximum aperture number (D-code). In previous revisions the maximum aperture number was 999. This was insufficient for current needs and numerous files in the market use higher aperture numbers. We have therefore increased the limit to the largest number that fits in a signed 32 bit integer.

Returns the size of the bounding rectangle

P-CAD seems to embed a lot of information in G04 comment blocks sprinkled throughout the file. It's probably not useful, but look into it just in case.

The Gerbers that Microchip provides with the MCP1631RD-DCPC1 are an example.

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en543898