Class: Preprocessor::Define
- Inherits:
-
Object
- Object
- Preprocessor::Define
- Defined in:
- lib/caphir/define.rb
Overview
class
Class Method Summary collapse
Instance Method Summary collapse
-
#initialize(params, tokens) ⇒ Define
constructor
A new instance of Define.
- #takes_args? ⇒ Boolean
-
#value(stack) ⇒ Object
returns a copy of the macro’s value with parameters substituted.
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
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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 |