Class: Rubber::C_Function

Inherits:
Object
  • Object
show all
Defined in:
lib/rubber/codegen/function.rb

Constant Summary collapse

CAST_SAFER = 
/\<\{([a-z0-9A-Z* ]+)(>[a-z0-9A-Z* ]+)?:([^{};:]+)\}\>/
CAST = 
/\<([^:;{}]+):([a-z0-9A-Z* ]+)\>/

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#block ⇒ Object (readonly)

Returns the value of attribute block.



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# File 'lib/rubber/codegen/function.rb', line 6

def block
  @block
end

#multi ⇒ Object (readonly)

Returns the value of attribute multi.



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# File 'lib/rubber/codegen/function.rb', line 6

def multi
  @multi
end

#rest ⇒ Object (readonly)

Returns the value of attribute rest.



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# File 'lib/rubber/codegen/function.rb', line 6

def rest
  @rest
end

#singleton ⇒ Object (readonly)

Returns the value of attribute singleton.



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# File 'lib/rubber/codegen/function.rb', line 6

def singleton
  @singleton
end

#source_file ⇒ Object

Returns the value of attribute source_file.



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# File 'lib/rubber/codegen/function.rb', line 5

def source_file
  @source_file
end

#source_line ⇒ Object

Returns the value of attribute source_line.



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# File 'lib/rubber/codegen/function.rb', line 5

def source_line
  @source_line
end

Instance Method Details

#alloc_func? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubber/codegen/function.rb', line 259

def alloc_func?
  name.split(/\./,2).last == '__alloc__'
end

#arity ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 252

def arity()
  check()
  return -1 if @multi
  num = args.size
  num -= 1 if @block
  num
end

#check ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 7

def check()
  return if @checked
  @block = @rest = @multi = false
  @singleton = true if name.include?('.')
  @arghash = {}
  @min_args = 0
  @opt_args = 0
  args.each { |arg|
    @arghash[arg.name] = arg
    raise "Too many block parameters for #{parent.name}.#{name.gsub(/^self./,'')}" if @block and arg.block 
    raise "Too many rest parameters for #{parent.name}.#{name}" if @rest and arg.rest
    @multi = true if arg.default or arg.rest
    if @multi
      @opt_args += 1 unless arg.block or arg.rest
    else
      @min_args += 1 unless arg.block
    end
    @block = arg if arg.block
    @rest = arg if arg.rest
  }
  @scan_string = "#{@min_args}#{@opt_args}#{@rest ? "*" : ""}#{@block ? "&" : ""}"
  @vars ||= {}
  @checked = true
end

#cname ⇒ Object

include RegisterChildren



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# File 'lib/rubber/codegen/function.rb', line 35

def cname()
 @cname ||= parent.name + ( @singleton ? '_CLASS' :'') + '_' + rname.gsub(/[?]/, '_query'). gsub(/[!]/, '_pling'). gsub(/[=]/, '_equals'). gsub(/[\[\]]/, '_brace')
end

#code(io) ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 92

def code(io)
  require 'stringio'
  check()
  prototype(io)
  io.puts ""
  io.puts "{"
  oio = io
  io = StringIO.new()
  args.each { |arg| 
    arg.declare(io,self) unless not @multi and not arg.auto_convert? and not arg.block
  }
  parent.pre_func(io, self) if parent.respond_to?(:pre_func)
  if @multi 
    io.puts ""
    io.puts "  /* Scan arguments */"
    io.puts("  rb_scan_args(__p_argc, __p_argv, #{@scan_string.inspect},#{args.collect {|i| "&"+i.cname }.join(', ') });")
    io.puts ""
    
    io.puts "  /* Set defaults */"
    args.each_index { |i| 
      arg = args[i]
      if arg.auto_convert?
        io.write("  if (__p_argc > #{i})\n  ") if arg.default
        io.puts("  __orig_#{arg.name} = #{arg.name} = #{Rubber::explicit_cast(arg.cname, 'VALUE', arg.ctype)};")
        io.puts("  else\n    #{arg.name} = #{arg.default};") if arg.default
      else
        io.puts("  if (__p_argc <= #{i})\n    #{arg.name} = #{arg.default};") if arg.default and not arg.block
        io.puts("  else") if arg.default and arg.rtype
        arg.check_type(io) if arg.rtype
      end
      io.puts "" if arg.default or arg.auto_convert?
    }
    #io.puts("  switch (argc) {")
    #for i in @min_args .. @min_args + @opt_args
    #  io.puts "    case #{i}:"
    #end
    #io.puts("  }")
  else
    args.each { |arg|
      if arg.auto_convert?
        io.puts("  __orig_#{arg.name} = #{arg.name} = #{Rubber::explicit_cast(arg.cname, 'VALUE', arg.ctype)};")
      elsif arg.block
        io.puts("  VALUE #{arg.name} OPTIONAL_ATTR = #{arg.init_value()};")
      else
         arg.check_type(io) if arg.rtype
      end
   }
  end

  io.puts ""
	io.puts "#line #{source_line} #{source_file.inspect}" if source_line
  setupvars = io.string
  io = oio
  
  returned = false
  oio =io
  io = StringIO.new()
  sc = StringScanner.new(text.strip)
  io.write "  " # Initial indent
   until sc.empty?
   if txt = sc.scan(CAST_SAFER)
      from_type, to_type, cast = sc[1], sc[2], sc[3]
      arg = @arghash[cast]
	to_type = to_type[1..-1] unless to_type.nil? or to_type.empty?
	to_type = (!(to_type.nil? or to_type.empty?) && to_type || (arg && arg.ctype || guess(cast)))
      io.write(Rubber.explicit_cast(cast, from_type, to_type))
   elsif txt = sc.scan(CAST)
warn("<TYPE:VALUE> is deprecated - please use <{FROM_TYPE>TO_TYPE:VALUE}> instead.")
      name, cast = sc[1], sc[2]
      arg = @arghash[name]
      io.write(Rubber::explicit_cast(name, arg && arg.ctype || guess(name), cast))
    elsif txt = sc.scan(/['"]/) #' Skip quoted string
      txt += sc.scan_until(/(^|[^\\])#{txt}/) # Skip until unescaped quote
      io.write(txt)
    elsif c = sc.scan(/;/)
      io.write ";\n "
    elsif c = sc.scan(/return\s+/)
      val = sc.scan_until(/;/)
      val.strip! if val
      if val and val.size > 1
        val.chop! # Trim last char
        io.write "do { __p_retval = "
        # Scan returned bit for casts
        retval = ""
        mini_scanner = StringScanner.new(val)
        until mini_scanner.eos?
          if txt = mini_scanner.scan(CAST_SAFER)
            from_type, to_type, cast = mini_scanner[1], mini_scanner[2], mini_scanner[3]
     	      arg = @arghash[cast]
     to_type = to_type[1..-1] unless to_type.nil? or to_type.empty?
     to_type = (!(to_type.nil? or to_type.empty?) && to_type || (arg && arg.ctype || guess(cast)))
            retval << (Rubber::explicit_cast(cast, from_type, to_type))
          elsif txt = mini_scanner.scan(CAST)
     warn("<TYPE:VALUE> is deprecated - please use <{TYPE>TO:VALUE}> instead.")
            name, cast = mini_scanner[1], mini_scanner[2]
            arg = @arghash[name]
            retval << (Rubber::explicit_cast(name, arg && arg.ctype || guess(name), cast))
          else
            retval << (mini_scanner.get_byte)
          end
        end
        unless Rubber.native_type?(returntype)
          io << Rubber.explicit_cast(retval, returntype, 'VALUE')
        else
          io << retval
        end
        #end of internal scan
        io.write "; goto out; } while(0);"
        returned = true
      else
        parent.post_func(io, self) if parent.respond_to?(:post_func)
        io.write(";")
      end
    elsif c = sc.scan(/([a-z0-9A-Z_]+[ *]+)([a-zA-Z0-9]+)\s*([\[\]0-9]*)\s*([;=])/)
      io.write "#{[sc[1], sc[2], sc[3], sc[4]].join(' ')}\n"
      @vars ||= {}
      base = sc[1].split(/\s/).first
      p = 0
      (sc[1]+sc[3]).each_byte { |i| p += 1 if i == ?[  or i == ?* }
      @vars[sc[2]] = base.strip + ( p > 0  && (' ' + ('*' * p)) || '' )
    elsif c = sc.get_byte
      io.write(c)
    end
  end
 
  code = io.string
  io = oio
  
  
  io.puts "  VALUE __p_retval OPTIONAL_ATTR = #{default()};" if returned
  io.puts setupvars
  io.puts "\n  do {" if @vars and not @vars.empty?
  io.puts code
  io.puts "\n  } while(0);\n\n" if @vars and not @vars.empty?
  io.puts "out:" if returned
  parent.post_func(io, self) if parent.respond_to?(:post_func)
  
  args.each { |arg|
      if arg.auto_convert? && $custom_frees[arg.ctype.gsub(/ /,'')]
        io.puts($custom_frees[arg.ctype].gsub(/%%/,"__orig_#{arg.name}")+";")
	end
   }

  if returned
    io.puts "  return __p_retval;"
  else
    io.puts "  return #{default()};"
  end
  io.puts "}"
  io.puts ""
end

#declare(io) ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 66

def declare(io)
  check()
  prototype(io)
  io.puts ";"
end

#default ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 243

def default
    if rname =~ /=\z/ and args.size == 1
      args.first.cname
    elsif rname =~ /\Aset_/
      "self"
    else
      "Qnil"
    end
end

#doc_rd(io) ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 48

def doc_rd(io)
  io << "--- #{fullname}"
  io << "(#{args.collect { |i| i.ruby_def }.join(', ')})\n" unless (fullname =~ /[!?]\z/ || !@singleton) and args.empty?
  io.puts doc
  io << "\n"
end

#fullname ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 38

def fullname()
  check()
  str = parent.fullname.dup
  if name == 'initialize'
      str << ".new"
  else
      str << ( @singleton ? (/^[a-zA-Z]/.match(rname) ? ".#{rname}" : rname) : "##{rname}")
  end
  str
end

#guess(name) ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 71

def guess(name)
  if name == 'self'
    'VALUE'
  elsif name == '_self' and parent.kind_of?(C_GObject)
    'GObject*'
  elsif @vars[name]
    @vars[name]
  else
    if name =~ /^([A-Za-z0-9_]+)\[.*$/
      if @vars[$1]
        @vars[$1]
      else
        VALUE;
      end
    else
      'VALUE'
    end
  end
end

#prototype(io) ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 54

def prototype(io)
  io.puts "static VALUE"
  io.write "#{cname}("
  if @multi
    io.write "int __p_argc, VALUE *__p_argv, VALUE self"
  else
    io.write "VALUE self OPTIONAL_ATTR "
    io.write(args.reject {|i| i.block }.collect { |i| ', VALUE ' + i.cname + " OPTIONAL_ATTR" }.join(''))
    #io.write ", " if args.size > 1 or (args.size > 0 and not @block)
  end
  io.write ")"
end

#register(io, already_defined = false) ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 262

def register(io, already_defined=false)
  if alloc_func?
    io.puts " rb_define_alloc_func(#{parent.cname}, #{cname});"
  else
    io.puts "  rb_define_#{@singleton ? "singleton_" : ""}method(#{parent.cname}, #{rname.inspect}, #{cname}, #{arity});"
  end
end

#rname ⇒ Object 



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# File 'lib/rubber/codegen/function.rb', line 31

def rname()
  name.split(/\./).last
end