Class: MCollective::Matcher::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/mcollective/matcher/parser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/mcollective/matcher/parser.rb', line 6

def initialize(args)
  @scanner = Scanner.new(args)
  @execution_stack = []
  @parse_errors = []
  @token_errors = []
  @paren_errors = []
  parse
  exit_with_token_errors if @token_errors.size > 0
  exit_with_parse_errors if @parse_errors.size > 0
  exit_with_paren_errors if @paren_errors.size > 0
end

Instance Attribute Details

#execution_stack ⇒ Object (readonly)

Returns the value of attribute execution_stack.



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# File 'lib/mcollective/matcher/parser.rb', line 4

def execution_stack
  @execution_stack
end

#scanner ⇒ Object (readonly)

Returns the value of attribute scanner.



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# File 'lib/mcollective/matcher/parser.rb', line 4

def scanner
  @scanner
end

Instance Method Details

#exit_with_paren_errors ⇒ Object 



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# File 'lib/mcollective/matcher/parser.rb', line 37

def exit_with_paren_errors
  @paren_errors.each do |i|
    @scanner.arguments[i] = Util.colorize(:red, @scanner.arguments[i])
  end
  raise "Missing parenthesis found while parsing -S input #{@scanner.arguments.join}"
end

#exit_with_parse_errors ⇒ Object 



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# File 'lib/mcollective/matcher/parser.rb', line 28

def exit_with_parse_errors
  @parse_errors.each do |error_range|
    (error_range[0]..error_range[1]).each do |i|
      @scanner.arguments[i] = Util.colorize(:red, @scanner.arguments[i])
    end
  end
  raise "Parse errors found while parsing -S input #{ @scanner.arguments.join}"
end

#exit_with_token_errors ⇒ Object

Exit and highlight any malformed tokens



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# File 'lib/mcollective/matcher/parser.rb', line 19

def exit_with_token_errors
  @token_errors.each do |error_range|
    (error_range[0]..error_range[1]).each do |i|
      @scanner.arguments[i] = Util.colorize(:red, @scanner.arguments[i])
    end
  end
  raise "Malformed token(s) found while parsing -S input #{@scanner.arguments.join}"
end

#parse ⇒ Object

Parse the input string, one token at a time a contruct the call stack



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# File 'lib/mcollective/matcher/parser.rb', line 45

def parse
  pre_index = @scanner.token_index
  p_token,p_token_value = nil
  c_token,c_token_value = @scanner.get_token
  parenth = 0

  while (c_token != nil)
    @scanner.token_index += 1
    n_token, n_token_value = @scanner.get_token

    unless n_token == " "
      case c_token
      when "bad_token"
        @token_errors << c_token_value

      when "and"
        unless (n_token =~ /not|fstatement|statement|\(/) || (scanner.token_index == scanner.arguments.size) && !(n_token == nil)
          @parse_errors << [pre_index, scanner.token_index]
        end

        if p_token == nil
          @parse_errors << [pre_index - c_token.size, scanner.token_index]
        elsif (p_token == "and" || p_token == "or")
          @parse_errors << [pre_index - 1 - p_token.size, pre_index - 1]
        end

      when "or"
        unless (n_token =~ /not|fstatement|statement|\(/) || (scanner.token_index == scanner.arguments.size) && !(n_token == nil)
          @parse_errors << [pre_index, scanner.token_index]
        end

        if p_token == nil
          @parse_errors << [pre_index - c_token.size, scanner.token_index]
        elsif (p_token == "and" || p_token == "or")
          @parse_errors << [pre_index - 1 - p_token.size, pre_index - 1]
        end

      when "not"
        unless n_token =~ /fstatement|statement|\(|not/ && !(n_token == nil)
          @parse_errors << [pre_index, scanner.token_index]
        end

      when "statement","fstatement"
        unless n_token =~ /and|or|\)/
          unless scanner.token_index == scanner.arguments.size
            @parse_errors << [pre_index, scanner.token_index]
          end
        end

      when ")"
        unless (n_token =~ /|and|or|not|\(/)
          unless(scanner.token_index == scanner.arguments.size)
            @parse_errors << [pre_index, scanner.token_index]
          end
        end
        unless @paren_errors.empty?
          @paren_errors.pop
        else
          @paren_errors.push((n_token.nil?) ? scanner.token_index - 1: scanner.token_index - n_token_value.size)
        end

      when "("
        unless n_token =~ /fstatement|statement|not|\(/
          @parse_errors << [pre_index, scanner.token_index]
        end
        @paren_errors.push((n_token.nil?) ? scanner.token_index - 1: scanner.token_index - n_token_value.size)

      else
        @parse_errors << [pre_index, scanner.token_index]
      end

      unless n_token == " " ||c_token == "bad_token"
        @execution_stack << {c_token => c_token_value}
      end

      p_token, p_token_value = c_token, c_token_value
      c_token, c_token_value = n_token, n_token_value
    end
    pre_index = @scanner.token_index
  end
end