65 lines
2.0 KiB
Ruby
65 lines
2.0 KiB
Ruby
module Vool
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class LambdaExpression < Expression
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attr_reader :args , :body , :clazz
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def initialize( args , body , clazz = nil)
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@args , @body = args , body
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raise "no bod" unless @body
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@clazz = clazz
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end
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# because of normalization (of send), slot_definition is called first,
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# to assign the block to a variable.
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#
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# This means we do the compiler here (rather than to_slot, which is in
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# fact never called)
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def to_slot_definition(compiler)
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compile(compiler) unless @parfait_block
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return SlotMachine::SlotDefinition.new(SlotMachine::LambdaConstant.new(parfait_block(compiler)) , [])
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end
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# create a block, a compiler for it, comile the bock and add the compiler(code)
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# to the method compiler for further processing
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def compile( compiler )
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parfait_block = self.parfait_block(compiler)
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block_compiler = SlotMachine::BlockCompiler.new( parfait_block , compiler.get_method )
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head = body.to_slot( block_compiler )
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block_compiler.add_code(head)
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compiler.add_method_compiler(block_compiler)
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nil
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end
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def each(&block)
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block.call(self)
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@body.each(&block)
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end
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def to_s(depth=0)
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"Block #{args} #{body}"
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end
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# create the parfait block (parfait representation of the block, a Callable similar
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# to CallableMethod)
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def parfait_block(compiler)
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return @parfait_block if @parfait_block
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@parfait_block = compiler.create_block( make_arg_type , make_frame(compiler))
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end
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private
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def make_arg_type( )
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type_hash = {}
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@args.each {|arg| type_hash[arg] = :Object }
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Parfait::Type.for_hash( type_hash )
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end
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def make_frame(compiler)
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type_hash = {}
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@body.each do |node|
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next unless node.is_a?(LocalVariable) or node.is_a?(LocalAssignment)
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next if compiler.in_scope?(node.name)
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type_hash[node.name] = :Object
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end
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Parfait::Type.for_hash( type_hash )
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end
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end
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end
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