39 lines
1.5 KiB
Ruby
39 lines
1.5 KiB
Ruby
module Bosl
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Compiler.class_eval do
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# if - attr_reader :cond, :if_true, :if_false
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def on_if expression
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condition , if_true , if_false = *expression
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condition = condition.first
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# to execute the logic as the if states it, the blocks are the other way around
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# so we can the jump over the else if true ,
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# and the else joins unconditionally after the true_block
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merge_block = method.source.new_block "if_merge" # last one, created first
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true_block = method.source.new_block "if_true" # second, linked in after current, before merge
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false_block = method.source.new_block "if_false" # directly next in order, ie if we don't jump we land here
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is = process(condition )
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# TODO should/will use different branches for different conditions.
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# just a scetch : cond_val = cond_val.is_true?(method) unless cond_val.is_a? BranchCondition
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method.source.add_code Virtual::IsTrueBranch.new( true_block )
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# compile the true block (as we think of it first, even it is second in sequential order)
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method.source.current true_block
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last = is
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last = process_all(if_true).last
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# compile the false block
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method.source.current false_block
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last = process_all(if_false).last
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method.source.add_code Virtual::UnconditionalBranch.new( merge_block )
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#puts "compiled if: end"
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method.source.current merge_block
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#TODO should return the union of the true and false types
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last
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end
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end
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end
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