53 lines
1.3 KiB
Ruby
53 lines
1.3 KiB
Ruby
#
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# YAML::YPath
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#
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module YAML
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class YPath
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attr_accessor :segments, :predicates, :flags
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def initialize( str )
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@segments = []
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@predicates = []
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@flags = nil
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while str =~ /^\/?(\/|[^\/\[]+)(?:\[([^\]]+)\])?/
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@segments.push $1
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@predicates.push $2
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str = $'
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end
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unless str.to_s.empty?
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@segments += str.split( "/" )
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end
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if @segments.length == 0
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@segments.push "."
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end
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end
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def YPath.each_path( str )
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#
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# Find choices
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#
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paths = []
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str = "(#{ str })"
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while str.sub!( /\(([^()]+)\)/, "\n#{ paths.length }\n" )
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paths.push $1.split( '|' )
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end
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#
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# Construct all possible paths
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#
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all = [ str ]
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( paths.length - 1 ).downto( 0 ) do |i|
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all = all.collect do |a|
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paths[i].collect do |p|
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a.gsub( /\n#{ i }\n/, p )
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end
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end.flatten.uniq
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end
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all.collect do |path|
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yield YPath.new( path )
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end
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end
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end
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end
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