Class: RDoc::Markup::PreProcess

Inherits:
Object
  • Object
show all
Defined in:
lib/rdoc/markup/pre_process.rb

Overview

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 RDoc::Markup@Directives for the list of built-in directives.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input_file_name, include_path) ⇒ PreProcess

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



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# File 'lib/rdoc/markup/pre_process.rb', line 77

def initialize(input_file_name, include_path)
  @input_file_name = input_file_name
  @include_path = include_path
  @options = nil
end

Instance Attribute Details

#optionsObject

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



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# File 'lib/rdoc/markup/pre_process.rb', line 22

def options
  @options
end

Class Method Details

.post_process(&block) ⇒ Object

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).



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# File 'lib/rdoc/markup/pre_process.rb', line 29

def self.post_process &block
  @post_processors << block
end

.post_processorsObject

Registered post-processors



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# File 'lib/rdoc/markup/pre_process.rb', line 36

def self.post_processors
  @post_processors
end

.register(directive, &block) ⇒ Object

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


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# File 'lib/rdoc/markup/pre_process.rb', line 52

def self.register directive, &block
  @registered[directive] = block
end

.registeredObject

Registered directives



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# File 'lib/rdoc/markup/pre_process.rb', line 59

def self.registered
  @registered
end

.resetObject

Clears all registered directives and post-processors



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# File 'lib/rdoc/markup/pre_process.rb', line 66

def self.reset
  @post_processors = []
  @registered = {}
end

Instance Method Details

#find_include_file(name) ⇒ Object

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



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# File 'lib/rdoc/markup/pre_process.rb', line 282

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) ⇒ Object

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.



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# File 'lib/rdoc/markup/pre_process.rb', line 98

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) ⇒ Object

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. – When 1.8.7 support is ditched prefix can be defaulted to ''



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# File 'lib/rdoc/markup/pre_process.rb', line 147

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.[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) ⇒ Object

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. – so all content will be verbatim because of the likely space after '#'? TODO shift left the whole file content in that case TODO comment stop/start #– and #++ in included file must be processed here



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# File 'lib/rdoc/markup/pre_process.rb', line 257

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