Method: RubyToAnsiC#process_iter

Defined in:
lib/ruby_to_ansi_c.rb

#process_iter(exp) ⇒ Object

Iterators for loops. After rewriter nearly all iter nodes should be able to be interpreted as a for loop. If not, then you are doing something not supported by C in the first place.

Raises:

  • (UnsupportedNodeError) 


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# File 'lib/ruby_to_ansi_c.rb', line 481

def process_iter(exp)
  out = []
  # Only support enums in C-land
  raise UnsupportedNodeError if exp[0][1].nil? # HACK ugly
  @env.scope do
    enum = exp[0][1][1] # HACK ugly t(:iter, t(:call, lhs <-- get lhs
    call = process exp.shift
    var  = process(exp.shift).intern # semi-HACK-y
    body = process exp.shift
    index = "index_#{var}"

    body += ";" unless body =~ /[;}]\Z/
    body.gsub!(/\n\n+/, "\n")

    out << "unsigned long #{index};"
    out << "for (#{index} = 0; #{enum}[#{index}] != NULL; ++#{index}) {"
    out << "#{self.class.c_type @env.lookup(var)} #{var} = #{enum}[#{index}];"
    out << body
    out << "}"
  end

  return out.join("\n")
end