Class: Repl

Inherits:
Object
  • Object
show all
Defined in:
lib/calculo/repl.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(prompt, type) ⇒ Repl

Returns a new instance of Repl.



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# File 'lib/calculo/repl.rb', line 9

def initialize(prompt,type)
        @history = []
        @og_prompt = prompt
        @prompt = "[#{@history.length}]" + @og_prompt + " "
        @type = type
        clear_screen()
        calculo_loop()
end

Instance Attribute Details

#history ⇒ Object

Returns the value of attribute history.



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# File 'lib/calculo/repl.rb', line 6

def history
  @history
end

#prompt ⇒ Object

Returns the value of attribute prompt.



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# File 'lib/calculo/repl.rb', line 7

def prompt
  @prompt
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/calculo/repl.rb', line 8

def type
  @type
end

Instance Method Details

#calculo_loop(output = "Welcome to calculo!") ⇒ Object 



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# File 'lib/calculo/repl.rb', line 98

def calculo_loop(output="Welcome to calculo!")
        input = nil
        while output != "Exiting calculo!"
                puts(output)
                @prompt = "[#{@history.length}]" + @og_prompt + " "
                print(@prompt)
                input = gets.chomp
                output = repl_eval(input)
        end
        puts(output)
        exit(1)
end

#calculo_print(history) ⇒ Object 



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# File 'lib/calculo/repl.rb', line 26

def calculo_print(history)
        history.each_with_index.map{|x,i| puts("#{i} : #{x}\n")}
end

#clear_screen ⇒ Object 



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# File 'lib/calculo/repl.rb', line 18

def clear_screen
        if OS.linux? or OS.mac? or OS.bsd?
                system('clear')
        elsif OS.windows?
                system('cls')
        end
end

#repl_eval(input) ⇒ Object 



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# File 'lib/calculo/repl.rb', line 30

def repl_eval(input)
        # syntax for changing prompt/type is:
        # set prompt/type = 'foo'
        # or set prompt/type 'foo'
        if input.start_with?("set","change")
                @history.push(input)
                input_array = input.split(' ')

                if input_array[1] == "prompt" and input_array.last != "prompt"
                        @og_prompt = input_array.last
                        @prompt = "[#{@history.length}]" + @og_prompt + " "
                        return "prompt is now #{@prompt}"

                elsif input_array[1] == "type" and input_array.last != "type"
                        @type = input_array.last        
                        return "type is now #{@type}"
                else
                        return "Error: variable can not be changed"
                end

        # If input is simply history, print all of the history
        # can also use ruby range syntax, STARTING AT 0
        # for example: history 0..-2 will print all but the
        # last entry of history 
        elsif input.start_with?("history")
                @history.push(input)
                if input == "history"
                        return calculo_print(@history)
                else
                        input_array = input.split(' ')
                        input_range = input_array[-1]
                        if input_range.length == 1
                                return @history[input_range.to_i]
                        elsif input_range.length == 4
                                return calculo_print(@history[(input_range.chars.first.to_i)..(input_range.chars.last.to_i)])
                        elsif input_range.length == 5
                                return calculo_print(@history[(input_range.chars.first.to_i)..(input_range.chars.drop(2).to_i)])
                        end
                end

        elsif input.start_with?("clear")
                @history.push(input)
                if input == "clear"
                        return clear_screen()
                elsif input == "clear history"
                        @history = []
                        return "History is now blank"
                end

        elsif input == "exit" or input == "quit"
                return "Exiting calculo!"

        else 
                if @type == 'lisp' or @type == 'reverse-lisp' or @type == 'reverse'
                       repl_class = Lisp.new(input,@type)
                       calculo_output = "#{repl_class.string} : #{repl_class.result}"
                       @history.push(calculo_output)
                       return calculo_output
                               
                elsif @type == 'postfix' or @type == 'infix' or @type == 'prefix' or @type == 'pn' or @type == 'rpn'
                       repl_class = MathNotation.new(input,@type)
                       calculo_output = "#{repl_class.string} : #{repl_class.result}"
                       @history.push(calculo_output)
                       return calculo_output
               end
        end
end