84 lines
1.7 KiB
Ruby
84 lines
1.7 KiB
Ruby
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require_relative "backend.rb"
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class Interpreter < Backend
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def initialize(code)
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@vartable={}
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@paramtable=[]
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@functable={}
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@retstack=[]
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@envstack=[]
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@noinc=["call","return"]
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@infunc=false
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super(code)
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end
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def execute(op)
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if @infunc
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if op[1]=="funcend"
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@infunc=false
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end
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return true
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end
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puts "Running #{op}"
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case op[1]
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when "="
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@vartable[op[0]]=toval(op[2])
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when "+","-","*","/"
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op[2]=toval(op[2])
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op[3]=toval(op[3])
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@vartable[op[0]]=op[2].send(op[1],op[3])
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when "param"
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@paramtable.push toval(op[2])
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when "call"
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result=nil
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case op[2]
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when "puts"
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puts @paramtable.shift
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result=1
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@pc+=1
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when "gets"
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print "Enter number:"
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result=gets.chomp!.to_i
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@pc+=1
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else
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if @functable.has_key? op[2]
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@retstack.push([@pc+1,op[0]])
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@pc=@functable[op[2]]
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@envstack.push @vartable
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@vartable={}
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end
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end
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if result and op[0]
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@vartable[op[0]]=result
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end
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when "func"
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@functable[op[2]]=@pc+1
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@infunc=true
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when "return"
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info=@retstack.pop()
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@pc=info[0]
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if op[2]
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rval=toval(op[2])
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else
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rval=nil
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end
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@vartable=@envstack.pop()
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@vartable[info[1]]=rval
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end
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puts "Vars:#{@vartable}"
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puts "Params:#{@paramtable}"
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puts "Funcs:#{@functable}"
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return !(@noinc.include? op[1])
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end
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private
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def toval(obj)
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if obj.is_a? Integer
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return obj
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elsif /^\d+/.match obj
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return obj.to_i
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elsif /^"([^"]+)"/.match obj
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return $1
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else
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return @vartable[obj]
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end
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end
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end
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