Class: Sizer

Inherits:
Object
  • Object
show all
Defined in:
lib/linmeric/Sizer.rb

Overview

Sizer analyzes the sintax of the inserted commands printing errors if they are found, before the string is manipulated by Scp and parsed by Parser.

Author

Massimiliano Dal Mas ([email protected])

License

Distributed under MIT license

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Sizer

Builds a new lexer



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# File 'lib/linmeric/Sizer.rb', line 19

def initialize()
  @lexer = Lexer.new
end

Instance Method Details

#analyze(string, equal = true) ⇒ Object

Analyzes the stream of tokens to check the sintax. It uses a turing machine to find errors.

  • argument: input comand string to analyze or stream of tokens (array)

  • argument: boolean value which identifies the possibility to find the

assign symbol ‘=`. true is default (`=` is allowed)

  • returns: true if the sintax is correct; false else



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# File 'lib/linmeric/Sizer.rb', line 30

def analyze(string, equal = true)  
  @i = 0
  state = 0
  return false if string == ""
  @@string = string if string.is_a? String
  unless string.is_a? Array
    unless balanced_brackets? string
      puts "Sintax Error: unbalanced brackets"
      return false 
    end
  end
  token = @lexer.tokenize(string) unless string.is_a? Array
  token = string if string.is_a? Array
  while @i < token.size
  
    case state
      # beginning state
      when 0
        case token[@i].attribute
          when "SUM_OPERATOR"
            state = 1
          when "VARIABLE"
            state = 2
          when "NUMBER"
            state = 2
          when "L_BRACE"
            sizer = Sizer.new
            return false unless sizer.analyze(token[(@i+1)...token.size])
            @i += sizer.count + 1
            state = 2
          when "KEYWORD"
            case token[@i].me
              when "mx:"
                state = 6
              when "integ:"
                state = 7
              when "shwvar:"
                unless equal
                  PrintError.reduced(token[@i],@@string)
                  return false
                end
                state = 5
              when "solve:"
                state = 8
              when "f:"
                state = 4
              else
                if ["t:","det:","norm:","id_mx:","shw:"].include? token[@i].me then
                  unless equal or token[@i].me != "shw:"
                    PrintError.reduced(token[@i],@@string)
                    return false
                  end
                  state = 3
                elsif not Tool.keys.include? token[@i].me then
                  PrintError.unknown(token[@i],@@string)
                  return false
                else
                  PrintError.reduced(token[@i],@@string)
                  return false
                end
            end
          else
            PrintError.default(token[@i],@@string)
            return false
        end
        
      # expecting numbers,variables, keywords, (
      when 1
        case token[@i].attribute
          when "NUMBER"
            state = 2
          when "VARIABLE"
            state = 2
          when "L_BRACE"
            sizer = Sizer.new
            return false unless sizer.analyze(token[(@i+1)...token.size])
            @i += sizer.count + 1
            state = 2
          when "KEYWORD"
            case token[@i].me
              when "mx:"
                state = 6
              when "integ:"
                state = 7
              when "shwvar:"
                state = 5
              when "solve:"
                state = 8
              when "f:"
                state = 4
              else
                if ["t:","det:","norm:","id_mx:"].include? token[@i].me then
                  state = 3
                elsif not Tool.keys.include? token[@i].me then
                  PrintError.unknown(token[@i],@@string)
                  return false
                else
                  PrintError.reduced(token[@i],@@string)
                  return false
                end
            end
          else
            PrintError.default(token[@i],@@string)
            return false
        end
      
      # expecting operators, )
      when 2
        case token[@i].attribute
          when "OPERATOR"
            state = 1
          when "SUM_OPERATOR"
            state = 1
          when "EQUAL_OP"
            if equal
              unless @i + 1 >= token.size
                sizer = Sizer.new
                return sizer.analyze(token[(@i+1)...token.size],false)
              end
              PrintError.missing_expression_after_equal(@i+1,@@string)
              return false
            else
              PrintError.default(token[@i],@@string)
              return false
            end
          when "TO_FILE_OP"
            unless equal
              PrintError.default(token[@i],@@string)
              return false
            end
            state = 4
          when "R_BRACE"
            return true
          else
            PrintError.default(token[@i],@@string)
            return false
        end
      
      # expecting only variables or numbers
      when 3
        case token[@i].attribute
          when "VARIABLE"
            state = 2
          when "NUMBER"
            state = 2
          else
            PrintError.default(token[@i],@@string)
            return false
        end
        state = 5 if token[@i-1].me == "shw:"
        
      # expects blocks (full chek) than nothing
      when 4
        return false unless check_block(token)
        state = 5
        
      # expects nothing
      when 5
        PrintError.default(token[@i],@@string)
        return false
        
      # checking mx arguments (full check)
      when 6
        case token[@i].attribute
          when "KEYWORD"
            if token[@i].me == "from:" then
              @i += 1
              unless @i < token.size
                PrintError.missing(token[@i-1],@@string)
                return false
              end
              return false unless check_block(token)
              state = 2
            else
              PrintError.missmatch(token[@i],@@string,"keyword 'from:' or block")
              return false
            end
          when "QUOTES"
            return false unless check_block(token)
            unless @i+1 >= token.size
              if token[@i+1].attribute == "KEYWORD" then
                @i += 1
#                  unless @i < token.size
#                    PrintError.missing(token[@i-1],@@string)
#                    return false
#                  end
                unless token[@i].me == "as:"
                  PrintError.missmatch(token[@i],@@string,"keyword 'as:' or operator")
                  return false
                end
                @i += 1
                unless @i < token.size
                  PrintError.missing_general_string(token[@i-1].position+token[@i-1],@@string)
                  return false
                end
                if token[@i].attribute == "QUOTES"
                  return false unless check_block(token)
                else
                  unless token[@i].attribute == "VARIABLE"
                    PrintError.default(token[@i],@@string)
                    return false 
                  end
                end
              end
            end
            state = 2
          else
            PrintError.missmatch(token[@i],@@string,"keyword 'from:' or block")
            return false
        end
        
      # checking integ arguments (full check)
      when 7  
        unless @i < token.size
          PrintError.missing(token[@i-1],@@string)
          return false
        end 
        if token[@i].attribute == "QUOTES" then
          return false unless check_block(token)
        elsif token[@i].attribute != "VARIABLE" then
          PrintError.missmatch(token[@i],@@string,"variable or block")
          return false
        end
        @i += 1
        unless @i < token.size
          PrintError.missing_integ_range(token[@i-1].position+1,@@string)
          return false
        end
        return false unless check_block(token)
        @i += 1
        unless @i < token.size
          PrintError.numPoint_missing(token[@i-1].position+1,@@string)
          return false
        end
        unless @i + 1 >= token.size
          if token[@i+1].attribute == "QUOTES" then
            @i += 1
            return false unless check_block(token)
          end
        end
        state = 2
        
      # checking solve args (full check)   
      when 8
        inner_state = 0
        while !(token[@i].attribute == "EQUALS_TO") and @i < token.size
          case inner_state  
            when 0
              if token[@i].attribute == "VARIABLE" or token[@i].attribute == "NUMBER" then
                inner_state = 1
              elsif token[@i].attribute == "L_BRACE"
                sizer = Sizer.new
                return false unless sizer.analyze(token[(@i+1)...token.size])
                @i += sizer.count + 1
              else
                PrintError.unexpected_token_in_solve(token[@i],@@string)
                return false
              end
            when 1
              if token[@i].attribute == "OPERATOR" then
                inner_state = 0
              else
                PrintError.unexpected_token_in_solve(token[@i],@@string)
                return false
              end
          end
          @i += 1
        end  
        state = 1   
    end
    @i += 1
  end
  
  unless state == 2 or state == 5 
    if token[@i-1].attribute == "R_BRACE" then
      tk = token[@i-2]
    else
      tk = token[@i-1]
    end 
    PrintError.missing(tk,@@string)
    return false
  end
  return true
end

#count ⇒ Object 



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# File 'lib/linmeric/Sizer.rb', line 315

def count
  return @i
end