Class: Preprocessor::Define

Inherits:
Object
  • Object
show all
Defined in:
lib/caphir/define.rb

Overview

class

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params, tokens) ⇒ Define

Returns a new instance of Define.



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# File 'lib/caphir/define.rb', line 241

def initialize(params, tokens)
  tokens = tokens.to_s
  tokens.strip!
  @value = CTokenizer::Lexer.new(tokens).to_a
  if params
    unless params.class == Parameters
      @parameters = Parameters.new
      params.each { |p| @parameters << p }
    else
      @parameters = params
    end
  else
    # will not contain any parameters

    @value = parse(@value, nil)
    @parameters = nil
  end
  @value.freeze
end

Class Method Details

.resolve_argument(resolving, tokens, defines) ⇒ Object 



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# File 'lib/caphir/define.rb', line 210

def Define.resolve_argument(resolving, tokens, defines)
  return tokens if tokens.empty?
  # this is important, as it sets the resolving value

  # for the rest of the token

  out = [ [:RESOLVING, resolving].freeze ]
  stack = MacroTokens.new(resolving, tokens)
  until stack.empty?
    t = stack.shift
    if t[0] == :IDENTIFIER and macro = defines[t_str = t[1]] \
    and not stack.resolving?(t_str)
      if macro.takes_args?
        unless stack.args_given?
          # no arguments given, don't resolve token

          out << t
          next
        end
        stack.add_function_macro(t_str, macro.value(stack) do |a|
          Define.resolve_argument(resolving, a, defines)
        end)
      else
        stack.add_object_macro(t_str, macro.value(stack))
      end
      # since we are saving out, must output this resolving token

      out << [:RESOLVING, stack.resolving].freeze
    else
      out << t
    end
  end # until

  out
end

Instance Method Details

#takes_args? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/caphir/define.rb', line 260

def takes_args?
  # if @parameters is empty still want to scan for '(' and ')'

  @parameters
end

#value(stack) ⇒ Object

returns a copy of the macro’s value with parameters substituted



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# File 'lib/caphir/define.rb', line 266

def value(stack)
  if takes_args?
    args = @parameters.arguments(stack).collect! do |a|
      # yield parameter tokens to be resolved

      v = a.collect do |t|
        case t[0]
          when :RESOLVING
            # these tokens are removed

          when :COMMENT, :NEWLINE then ' '
          else t[1]
        end
      end.join
      v.strip! # whitespace should be removed

      [:PARAMETER, v, yield(a)]
      # [ :PARAMETER, token text, resolved token ]

      # ie [ :PARAMETER, '__LINE__', [[:CONSTANT, 10]] ]

    end
  
    # do argument substitution

    parse( \
      @value.collect do |t|
        if t[0] == :IDENTIFIER and idx = @parameters.index(t[1])
          args[idx]
        else
          t
        end
      end , stack.resolving )
  else
    @value.dup
  end
end