Class: Preprocessor::Parameters

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

Overview

class

Constant Summary collapse

VA_ARGS = 
'__VA_ARGS__'.freeze
ELLIPSIS = 
'...'.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parameters

Returns a new instance of Parameters.



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# File 'lib/caphir/define.rb', line 360

def initialize
	super
	@ellipses = nil
end

Class Method Details

.get_closing_braket(arg, tokens) ⇒ Object 



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# File 'lib/caphir/define.rb', line 468

def Parameters.get_closing_braket(arg, tokens)
	begin
		t = tokens.shift
		tokens.unmatched_error('}') unless t and t[0]

		arg << t
		case t[1]
			when '('
				get_closing_paren(arg, tokens)
			when ')'
				tokens.unmatched_error(')')
			when '{'
				get_closing_braket(arg, tokens)
		end
	end until t[1] == '}'
end

.get_closing_paren(arg, tokens) ⇒ Object 



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# File 'lib/caphir/define.rb', line 451

def Parameters.get_closing_paren(arg, tokens)
	begin
		t = tokens.shift
		tokens.unmatched_error(')') unless t and t[0]
	
		arg << t
		case t[1]
			when '{'
				get_closing_braket(arg, tokens)
			when '}'
				tokens.unmatched_error('}')
			when '('
				get_closing_paren(arg, tokens)
		end
	end until t[1] == ')'
end

Instance Method Details

#arguments(tokens) ⇒ Object

it is important that we keep track of the last resolving status when splitting up arguments. That way the argument does not inherit the last resolving status of the previous tokens when it is substituted.



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# File 'lib/caphir/define.rb', line 396

def arguments(tokens)

	# skip whitespace
	while true
		t = tokens.shift
		case t[0]
			when :RESOLVING, :SPACE, :COMMENT, :NEWLINE
				# do nothing
			else
				break
		end
	end

	tokens.error("expecting '('") unless t[1] == '('
	
	arguments = [arg = [ [:RESOLVING, tokens.resolving].freeze ] ]
	
	while true
		t = tokens.shift
		tokens.unmatched_error(')') unless t and t[0]

		# comma and the closing ')' are not outputed
		# bunch all the remaining parameters into the last parameter
		if t[1] == ',' and arguments.length < self.length
			# start of a new argument
			arguments.push([ [:RESOLVING, tokens.resolving].freeze ])
			arg = arguments.last
		elsif t[1] == ')'
			break # end of parameter list
		else
			arg << t
			case t[1]
				when '{'
					Parameters.get_closing_braket(arg, tokens)
				when '}'
					tokens.unmatched_error('}')
				when '('
					Parameters.get_closing_paren(arg, tokens)
			end
		end
	end

	got = arguments.length
	expected = self.length
	if got < expected
		tokens.error("wrong number of arguments (#{got} for #{expected})") unless ellipses?
		expected -= 1 # the variable argument list can be blank
		tokens.error("wrong number of arguments (#{got} for #{expected}+)") \
				unless got == expected
		arguments[expected] = [] # last arg is blank
	end

	arguments
end

#ellipses? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/caphir/define.rb', line 377

def ellipses?
	@ellipses
end

#inspect ⇒ Object 



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# File 'lib/caphir/define.rb', line 389

def inspect
	"\#<#{self.class}:#{self.to_s}>"
end

#to_s ⇒ Object 



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# File 'lib/caphir/define.rb', line 381

def to_s
	if ellipses?
		self[0, self.length - 1] << @ellipses
	else
		self
	end.join(',')
end

#with_ellipses(arg = nil) ⇒ Object 



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# File 'lib/caphir/define.rb', line 365

def with_ellipses(arg=nil)
	raise "already has ellipses: #{self}" if ellipses?
	if arg and arg != ELLIPSIS
		self << arg
		@ellipses = arg + ELLIPSIS # if arg is 'i' then 'i...'
	else
		self << VA_ARGS
		@ellipses = ELLIPSIS
	end
	self
end