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#!/usr/bin/ruby
module ANTLR3
module Template
Parameter = Struct.new( :name, :default )
class Parameter
def to_s
if block then "&#{ name }"
elsif splat then "*#{ name }"
elsif default then "#{ name } = #{ default }"
else name.dup
end
end
end
class ParameterList < ::Array
attr_accessor :splat, :block
def self.default
new.add( :values ) do | p |
p.default = '{}'
end
end
def names
names = map { | param | param.name.to_s }
@splat and names << @splat.to_s
@block and names << @block.to_s
return( names )
end
def add( name, default = nil )
param =
case name
when Parameter then name
else Parameter.new( name.to_s )
end
if options
default = options[ :default ] and param.default = default
param.splat = options.fetch( :splat, false )
param.block = options.fetch( :block, false )
end
block_given? and yield( param )
push( param )
return( self )
end
def to_s
signature = join( ', ' )
@splat and signature << ", *" << @splat.to_s
@block and signature << ", &" << @block.to_s
return( signature )
end
end
end
end
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