50 lines
1.5 KiB
Ruby
50 lines
1.5 KiB
Ruby
module Ast
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class OperatorExpression < Expression
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# attr_reader :operator, :left, :right
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def compile context , into
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puts "compiling operator #{to_s}"
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r_val = right.compile(context , into)
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#puts "compiled right #{r_val.inspect}"
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if operator == "=" # assignment, value based
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raise "Can only assign variables, not #{left}" unless left.is_a?(NameExpression)
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l_val = context.locals[left.name]
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if( l_val ) #variable existed, move data there
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l_val = l_val.move( into , r_val)
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else
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l_val = context.function.new_local.move( into , r_val )
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end
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context.locals[left.name] = l_val
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return l_val
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end
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l_val = left.compile(context , into)
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into = into.scope binding
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case operator
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when ">"
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code = l_val.greater_than into , r_val
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when "<"
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code = l_val.less_than into , r_val
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when ">="
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code = l_val.greater_or_equal into , r_val
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when "<="
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code = l_val.less_or_equal into , r_val
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when "=="
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code = l_val.equals into , r_val
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when "+"
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res = context.function.new_local
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into.res = l_val + r_val
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code = res
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when "-"
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res = context.function.new_local
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code = res.minus into , l_val , r_val
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when "<<"
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res = context.function.new_local
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code = res.left_shift into , l_val , r_val
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else
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raise "unimplemented operator #{operator} #{self}"
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end
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code
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end
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end
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end |