class RDoc::Markup::PreProcess

Handle common directives that can occur in a block of text:

:include: filename

Directives can be escaped by preceding them with a backslash.

RDoc plugin authors can register additional directives to be handled by using RDoc::Markup::PreProcess::register.

Any directive that is not built-in to RDoc (including those registered via plugins) will be stored in the metadata hash on the CodeObject the comment is attached to. See Directives at RDoc::Markup for the list of built-in directives.

Attributes

options[RW]

An RDoc::Options instance that will be filled in with overrides from directives

Public Class Methods

new(input_file_name, include_path) click to toggle source

Creates a new pre-processor for input_file_name that will look for included files in include_path

# File lib/rdoc/markup/pre_process.rb, line 78
def initialize(input_file_name, include_path)
  @input_file_name = input_file_name
  @include_path = include_path
  @options = nil
end

post_process(&block) click to toggle source

Adds a post-process handler for directives. The handler will be called with the result RDoc::Comment (or text String) and the code object for the comment (if any).

# File lib/rdoc/markup/pre_process.rb, line 30
def self.post_process &block
  @post_processors << block
end

post_processors() click to toggle source

Registered post-processors

# File lib/rdoc/markup/pre_process.rb, line 37
def self.post_processors
  @post_processors
end

Registers directive as one handled by RDoc. If a block is given the directive will be replaced by the result of the block, otherwise the directive will be removed from the processed text.

The block will be called with the directive name and the directive parameter:

RDoc::Markup::PreProcess.register 'my-directive' do |directive, param|
  # replace text, etc.
end

# File lib/rdoc/markup/pre_process.rb, line 53
def self.register directive, &block
  @registered[directive] = block
end

registered() click to toggle source

Registered directives

# File lib/rdoc/markup/pre_process.rb, line 60
def self.registered
  @registered
end

reset() click to toggle source

Clears all registered directives and post-processors

# File lib/rdoc/markup/pre_process.rb, line 67
def self.reset
  @post_processors = []
  @registered = {}
end

Public Instance Methods

find_include_file(name) click to toggle source

Look for the given file in the directory containing the current file, and then in each of the directories specified in the RDOC_INCLUDE path

# File lib/rdoc/markup/pre_process.rb, line 283
def find_include_file(name)
  to_search = [File.dirname(@input_file_name)].concat @include_path
  to_search.each do |dir|
    full_name = File.join(dir, name)
    stat = File.stat(full_name) rescue next
    return full_name if stat.readable?
  end
  nil
end

handle(text, code_object = nil, &block) click to toggle source

Look for directives in the given text.

Options that we don't handle are yielded. If the block returns false the directive is restored to the text. If the block returns nil or no block was given the directive is handled according to the registered directives. If a String was returned the directive is replaced with the string.

If no matching directive was registered the directive is restored to the text.

If code_object is given and the directive is unknown then the directive's parameter is set as metadata on the code_object. See RDoc::CodeObject#metadata for details.

# File lib/rdoc/markup/pre_process.rb, line 99
def handle text, code_object = nil, &block
  if RDoc::Comment === text then
    comment = text
    text = text.text
  end

  encoding = text.encoding if defined?(Encoding)

  # regexp helper (square brackets for optional)
  # $1      $2  $3        $4      $5
  # [prefix][\]:directive:[spaces][param]newline
  text.gsub!(/^([ \t]*(?:#|\/?\*)?[ \t]*)(\\?):(\w+):([ \t]*)(.+)?(\r?\n|$)/) do
    # skip something like ':toto::'
    next $& if $4.empty? and $5 and $5[0, 1] == ':'

    # skip if escaped
    next "#$1:#$3:#$4#$5\n" unless $2.empty?

    # This is not in handle_directive because I didn't want to pass another
    # argument into it
    if comment and $3 == 'markup' then
      next "#{$1.strip}\n" unless $5
      comment.format = $5.downcase
      next "#{$1.strip}\n"
    end

    handle_directive $1, $3, $5, code_object, encoding, &block
  end

  comment = text unless comment

  self.class.post_processors.each do |handler|
    handler.call comment, code_object
  end

  text
end

handle_directive(prefix, directive, param, code_object = nil, encoding = nil) { |directive, param| ... } click to toggle source

Performs the actions described by directive and its parameter param.

code_object is used for directives that operate on a class or module. prefix is used to ensure the replacement for handled directives is correct. encoding is used for the include directive.

For a list of directives in RDoc see RDoc::Markup.

# File lib/rdoc/markup/pre_process.rb, line 148
def handle_directive prefix, directive, param, code_object = nil,
                     encoding = nil
  blankline = "#{prefix.strip}\n"
  directive = directive.downcase

  case directive
  when 'arg', 'args' then
    return "#{prefix}:#{directive}: #{param}\n" unless code_object

    code_object.params = param

    blankline
  when 'category' then
    if RDoc::Context === code_object then
      section = code_object.add_section param
      code_object.temporary_section = section
    end

    blankline # ignore category if we're not on an RDoc::Context
  when 'doc' then
    return blankline unless code_object
    code_object.document_self = true
    code_object.force_documentation = true

    blankline
  when 'enddoc' then
    return blankline unless code_object
    code_object.done_documenting = true

    blankline
  when 'include' then
    filename = param.split.first
    include_file filename, prefix, encoding
  when 'main' then
    @options.main_page = param if @options.respond_to? :main_page

    blankline
  when 'nodoc' then
    return blankline unless code_object
    code_object.document_self = nil # notify nodoc
    code_object.document_children = param !~ /all/i

    blankline
  when 'notnew', 'not_new', 'not-new' then
    return blankline unless RDoc::AnyMethod === code_object

    code_object.dont_rename_initialize = true

    blankline
  when 'startdoc' then
    return blankline unless code_object

    code_object.start_doc
    code_object.force_documentation = true

    blankline
  when 'stopdoc' then
    return blankline unless code_object

    code_object.stop_doc

    blankline
  when 'title' then
    @options.default_title = param if @options.respond_to? :default_title=

    blankline
  when 'yield', 'yields' then
    return blankline unless code_object
    # remove parameter &block
    code_object.params.sub!(/,?\s*&\w+/, '') if code_object.params

    code_object.block_params = param

    blankline
  else
    result = yield directive, param if block_given?

    case result
    when nil then
      code_object.metadata[directive] = param if code_object

      if RDoc::Markup::PreProcess.registered.include? directive then
        handler = RDoc::Markup::PreProcess.registered[directive]
        result = handler.call directive, param if handler
      else
        result = "#{prefix}:#{directive}: #{param}\n"
      end
    when false then
      result = "#{prefix}:#{directive}: #{param}\n"
    end

    result
  end
end

include_file(name, indent, encoding) click to toggle source

Handles the :include: filename directive.

If the first line of the included file starts with '#', and contains an encoding information in the form 'coding:' or 'coding=', it is removed.

If all lines in the included file start with a '#', this leading '#' is removed before inclusion. The included content is indented like the :include: directive.

# File lib/rdoc/markup/pre_process.rb, line 258
def include_file name, indent, encoding
  full_name = find_include_file name

  unless full_name then
    warn "Couldn't find file to include '#{name}' from #{@input_file_name}"
    return ''
  end

  content = RDoc::Encoding.read_file full_name, encoding, true

  # strip magic comment
  content = content.sub(/\A# .*coding[=:].*$/, '').lstrip

  # strip leading '#'s, but only if all lines start with them
  if content =~ /^[^#]/ then
    content.gsub(/^/, indent)
  else
    content.gsub(/^#?/, indent)
  end
end