Directory structure reorganization.
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# vim: set nosta noet ts=4 sw=4:
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require 'strscan'
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require 'stringio'
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#
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# Chunker: A convenience library for parsing __END__ tokens consistently.
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#
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# == Version
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#
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# $Id$
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#
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# == Author
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#
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# * Mahlon E. Smith <mahlon@martini.nu>
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#
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# :include: LICENSE
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#
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### Namespace for the datablock parser.
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###
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module Chunker
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# VCS Revision
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VCSRev = %q$Rev$
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# VCS Id
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VCSId = %q$Id$
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# Package version
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VERSION = '1.0.0'
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### Parser class for __END__ data blocks.
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### Find each __TOKEN__ within the __END__, and put each into a
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### DATA_TOKEN constant within the namespace that included us.
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###
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class DataParser
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# The mark for a DATA block.
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END_TOKEN = /^__END__\r?\n/
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# The mark for a 'sub' block.
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CHUNK_TOKEN = /^__([A-Z\_0-9]+)__\r?\n/
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### Constructor: Given a +klass+ and an +io+ to the class file,
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### extract the data blocks and install constants.
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###
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def initialize( klass, io )
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io.open if io.closed?
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end_string = io.read.split( END_TOKEN, 2 ).last
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@klass = klass
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@scanner = StringScanner.new( end_string )
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io.close
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# put each chunk into its own constant
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#
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if @scanner.check_until( CHUNK_TOKEN )
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self.extract_blocks
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# no sub blocks, put the whole mess into DATA_END
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#
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else
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@klass.const_set( :DATA_END, StringIO.new( end_string ) )
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end
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end
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#########
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protected
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#########
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### Parse the current +io+ for data blocks, set contents to
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### IO constants in the including class.
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###
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def extract_blocks
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label = nil
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while @scanner.scan_until( CHUNK_TOKEN ) and ! @scanner.eos?
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data = ''
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# First pass, __END__ contents (until next token, instead
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# of entire data block.)
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#
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if label.nil?
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label = 'END'
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data = @scanner.pre_match
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@scanner.pos = self.next_position
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else
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label = @scanner[1]
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# Pull the next token text out of the data, set up the next pass
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#
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if data = @scanner.scan_until( CHUNK_TOKEN )
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data = data[ 0, data.length - @scanner[0].length ]
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@scanner.pos = self.next_position
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# No additional blocks
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#
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else
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data = @scanner.rest
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end
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end
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# Add the IO constant to the class that included me.
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@klass.const_set( "DATA_#{label}".to_sym, StringIO.new( data ) )
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end
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end
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### Return the next scanner position for searching.
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###
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def next_position
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return @scanner.pos - @scanner[0].length
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end
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end
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### Hook included: Find the file path for how we arrived here, and open
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### it as an IO object. Parse the IO for data block tokens.
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###
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def self.included( klass )
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# klass.instance_eval{ __FILE__ } awww, nope.
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# __FILE__ won't work here, so we find the filename via caller().
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io = File.open( caller(1).last.sub(/:.*?$/, ''), 'r' )
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DataParser.new( klass, io )
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end
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end
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