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  • rdoc/parser/f95.rb


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Fortran95 RDoc Parser


This parser parses Fortran95 files with suffixes “f90”, “F90”, “f95” and “F95”. Fortran95 files are expected to be conformed to Fortran95 standards.


Fundamental rules are same as that of the Ruby parser. But comment markers are '!' not '#'.

Correspondence between RDoc documentation and Fortran95 programs

F95 parses main programs, modules, subroutines, functions, derived-types, public variables, public constants, defined operators and defined assignments. These components are described in items of RDoc documentation, as follows.


Files (same as Ruby)




Subroutines, functions, variables, constants, derived-types, defined operators, defined assignments

Required files

Files in which imported modules, external subroutines and external functions are defined.

Included Modules

List of imported modules


List of derived-types, List of imported modules all of whose components are published again

Components listed in 'Methods' (subroutines, functions, …) defined in modules are described in the item of 'Classes'. On the other hand, components defined in main programs or as external procedures are described in the item of 'Files'.

Components parsed by default

By default, documentation on public components (subroutines, functions, variables, constants, derived-types, defined operators, defined assignments) are generated.

With “–all” option, documentation on all components are generated (almost same as the Ruby parser).

Information parsed automatically

The following information is automatically parsed.

  • Types of arguments

  • Types of variables and constants

  • Types of variables in the derived types, and initial values

  • NAMELISTs and types of variables in them, and initial values

Aliases by interface statement are described in the item of 'Methods'.

Components which are imported from other modules and published again are described in the item of 'Methods'.

Format of comment blocks

Comment blocks should be written as follows.

Comment blocks are considered to be ended when the line without '!' appears.

The indentation is not necessary.

! (Top of file)
! Comment blocks for the files.
! The comment described in the part enclosed by
! "!--" and "!++" is ignored.
module hogehoge
  ! Comment blocks for the modules (or the programs).


  logical            :: a     ! a private variable
  real, public       :: b     ! a public variable
  integer, parameter :: c = 0 ! a public constant

  public :: c
  public :: MULTI_ARRAY
  public :: hoge, foo

    ! Comment blocks for the derived-types.
    real, pointer :: var(:) =>null() ! Comments block for the variables.
    integer       :: num = 0
  end type MULTI_ARRAY


  subroutine hoge( in,   &   ! Comment blocks between continuation lines are ignored.
      &            out )
    ! Comment blocks for the subroutines or functions
    character(*),intent(in):: in ! Comment blocks for the arguments.
    character(*),intent(out),allocatable,target  :: in
                                 ! Comment blocks can be
                                 ! written under Fortran statements.

    character(32) :: file ! This comment parsed as a variable in below NAMELIST.
    integer       :: id

    namelist /varinfo_nml/ file, id
            ! Comment blocks for the NAMELISTs.
            ! Information about variables are described above.


  end subroutine hoge

  integer function foo( in )
    ! This part is considered as comment block.

    ! Comment blocks under blank lines are ignored.
    integer, intent(in):: inA ! This part is considered as comment block.

                              ! This part is ignored.

  end function foo

  subroutine hide( in,   &
    &              out )      !:nodoc:
    ! If "!:nodoc:" is described at end-of-line in subroutine
    ! statement as above, the subroutine is ignored.
    ! This assignment can be used to modules, subroutines,
    ! functions, variables, constants, derived-types,
    ! defined operators, defined assignments,
    ! list of imported modules ("use" statement).


  end subroutine hide

end module hogehoge



Comments are below source code


Comments are upper source code


External alias message


Internal alias message

Public Instance Methods

scan() click to toggle source

Define code constructs

               # File rdoc/parser/f95.rb, line 201
def scan
  # remove private comment
  remaining_code = remove_private_comments(@content)

  # continuation lines are united to one line
  remaining_code = united_to_one_line(remaining_code)

  # semicolons are replaced to line feed
  remaining_code = semicolon_to_linefeed(remaining_code)

  # collect comment for file entity
  whole_comment, remaining_code = collect_first_comment(remaining_code)
  @top_level.comment = whole_comment

  # String "remaining_code" is converted to Array "remaining_lines"
  remaining_lines = remaining_code.split("\n")

  # "module" or "program" parts are parsed (new)
  level_depth = 0
  block_searching_flag = nil
  block_searching_lines = []
  pre_comment = []
  module_program_trailing = ""
  module_program_name = ""
  other_block_level_depth = 0
  other_block_searching_flag = nil
    if !block_searching_flag && !other_block_searching_flag
      if line =~ /^\s*?module\s+(\w+)\s*?(!.*?)?$/i
        block_searching_flag = :module
        block_searching_lines << line
        module_program_name = $1
        module_program_trailing = find_comments($2)
        next false
      elsif line =~ /^\s*?program\s+(\w+)\s*?(!.*?)?$/i ||
             line =~ /^\s*?\w/ && !block_start?(line)
        block_searching_flag = :program
        block_searching_lines << line
        module_program_name = $1 || ""
        module_program_trailing = find_comments($2)
        next false

      elsif block_start?(line)
        other_block_searching_flag = true
        next line

      elsif line =~ /^\s*?!\s?(.*)/
        pre_comment << line
        next line
        pre_comment = []
        next line
    elsif other_block_searching_flag
      other_block_level_depth += 1 if block_start?(line)
      other_block_level_depth -= 1 if block_end?(line)
      if other_block_level_depth < 0
        other_block_level_depth = 0
        other_block_searching_flag = nil
      next line

    block_searching_lines << line
    level_depth += 1 if block_start?(line)
    level_depth -= 1 if block_end?(line)
    if level_depth >= 0
      next false

    # "module_program_code" is formatted.
    # ":nodoc:" flag is checked.
    module_program_code = block_searching_lines.join("\n")
    module_program_code = remove_empty_head_lines(module_program_code)
    if module_program_trailing =~ /^:nodoc:/
      # next loop to search next block
      level_depth = 0
      block_searching_flag = false
      block_searching_lines = []
      pre_comment = []
      next false

    # NormalClass is created, and added to @top_level
    if block_searching_flag == :module
      module_name = module_program_name
      module_code = module_program_code
      module_trailing = module_program_trailing

      f9x_module = @top_level.add_module NormalClass, module_name
      f9x_module.record_location @top_level

      @stats.add_module f9x_module

      f9x_comment = COMMENTS_ARE_UPPER ? 
        find_comments(pre_comment.join("\n"))  + "\n" + module_trailing :
          module_trailing + "\n" + find_comments(module_code.sub(/^.*$\n/i, ''))
      f9x_module.comment = f9x_comment
      parse_program_or_module(f9x_module, module_code)

      TopLevel.all_files.each do |name, toplevel|
        if toplevel.include_includes?(module_name, @options.ignore_case)
          if !toplevel.include_requires?(@file_name, @options.ignore_case)
            toplevel.add_require(, ""))
          if m.include_includes?(module_name, @options.ignore_case)
            if !m.include_requires?(@file_name, @options.ignore_case)
              m.add_require(, ""))
    elsif block_searching_flag == :program
      program_name = module_program_name
      program_code = module_program_code
      program_trailing = module_program_trailing
      # progress "p" # HACK what stats thingy does this correspond to?
      program_comment = COMMENTS_ARE_UPPER ? 
        find_comments(pre_comment.join("\n")) + "\n" + program_trailing : 
          program_trailing + "\n" + find_comments(program_code.sub(/^.*$\n/i, ''))
      program_comment = "\n\n= <i>Program</i> <tt>#{program_name}</tt>\n\n" \
                        + program_comment
      @top_level.comment << program_comment
      parse_program_or_module(@top_level, program_code, :private)

    # next loop to search next block
    level_depth = 0
    block_searching_flag = false
    block_searching_lines = []
    pre_comment = []
    next false

  remaining_lines.delete_if{ |line|
    line == false

  # External subprograms and functions are parsed
  parse_program_or_module(@top_level, remaining_lines.join("\n"),
                          :public, true)