52 lines
1.7 KiB
Ruby
52 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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module Rpl
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module Lang
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module Core
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module_function
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# ( x prg -- … ) run PRG X times putting i(counter) on the stack before each run
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def times( stack, dictionary )
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stack, args = Rpl::Lang.stack_extract( stack, [:any, %i[numeric]] )
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args[1][:value].to_i.times do |i|
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counter = { value: BigDecimal( i, Rpl::Lang.precision ), type: :numeric, base: 10 }
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stack << counter << args[0]
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stack, dictionary = Rpl::Lang::Core.eval( stack, dictionary )
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end
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[stack, dictionary]
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end
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# ( x y prg -- … ) run PRG (Y - X) times putting i(counter) on the stack before each run
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def loop( stack, dictionary )
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stack, args = Rpl::Lang.stack_extract( stack, [:any, %i[numeric], %i[numeric]] )
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((args[2][:value].to_i)..(args[1][:value].to_i)).each do |i|
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counter = { value: BigDecimal( i, Rpl::Lang.precision ), type: :numeric, base: 10 }
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stack << counter << args[0]
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stack, dictionary = Rpl::Lang::Core.eval( stack, dictionary )
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end
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[stack, dictionary]
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end
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# similar to if-then-else-end, <test-instruction> <true-instruction> <false-instruction> ifte
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def ifte( stack, dictionary )
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stack, args = Rpl::Lang.stack_extract( stack, [:any, :any, %i[boolean]] )
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stack << args[ args[2][:value] ? 1 : 0 ]
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Rpl::Lang::Core.eval( stack, dictionary )
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end
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# Implemented in Rpl
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# similar to if-then-end, <test-instruction> <true-instruction> ift
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def ift( stack, dictionary )
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Rpl::Lang.eval( stack, dictionary, '« nop » ifte' )
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end
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end
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end
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end
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